Migrate to android-json

Migrate from `org.json:json` to the clean room Apache 2.0 licensed
version that was developed for Android.

Fixes gh-5929

spring-boot-cli/pom.xml

@@ -38,6 +38,10 @@
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-loader-tools</artifactId>
 		</dependency>
+		<dependency>
+			<groupId>com.vaadin.external.google</groupId>
+			<artifactId>android-json</artifactId>
+		</dependency>
 		<dependency>
 			<groupId>jline</groupId>
 			<artifactId>jline</artifactId>
@@ -54,10 +58,6 @@
 			<groupId>org.springframework</groupId>
 			<artifactId>spring-core</artifactId>
 		</dependency>
-		<dependency>
-			<groupId>org.json</groupId>
-			<artifactId>json</artifactId>
-		</dependency>
 		<dependency>
 			<groupId>org.apache.maven</groupId>
 			<artifactId>maven-aether-provider</artifactId>

spring-boot-cli/src/main/java/org/springframework/boot/cli/command/init/InitializrService.java

@@ -233,7 +233,8 @@ class InitializrService {
 		return null;
 	}
 
-	private JSONObject getContentAsJson(HttpEntity entity) throws IOException {
+	private JSONObject getContentAsJson(HttpEntity entity)
+			throws IOException, JSONException {
 		return new JSONObject(getContent(entity));
 	}
 

spring-boot-cli/src/main/java/org/springframework/boot/cli/command/init/InitializrServiceMetadata.java

@@ -23,6 +23,7 @@ import java.util.Iterator;
 import java.util.Map;
 
 import org.json.JSONArray;
+import org.json.JSONException;
 import org.json.JSONObject;
 
 /**
@@ -58,8 +59,9 @@ class InitializrServiceMetadata {
 	/**
 	 * Creates a new instance using the specified root {@link JSONObject}.
 	 * @param root the root JSONObject
+	 * @throws JSONException on JSON parsing failure
 	 */
-	InitializrServiceMetadata(JSONObject root) {
+	InitializrServiceMetadata(JSONObject root) throws JSONException {
 		this.dependencies = parseDependencies(root);
 		this.projectTypes = parseProjectTypes(root);
 		this.defaults = Collections.unmodifiableMap(parseDefaults(root));
@@ -124,7 +126,8 @@ class InitializrServiceMetadata {
 		return this.defaults;
 	}
 
-	private Map<String, Dependency> parseDependencies(JSONObject root) {
+	private Map<String, Dependency> parseDependencies(JSONObject root)
+			throws JSONException {
 		Map<String, Dependency> result = new HashMap<String, Dependency>();
 		if (!root.has(DEPENDENCIES_EL)) {
 			return result;
@@ -138,7 +141,8 @@ class InitializrServiceMetadata {
 		return result;
 	}
 
-	private MetadataHolder<String, ProjectType> parseProjectTypes(JSONObject root) {
+	private MetadataHolder<String, ProjectType> parseProjectTypes(JSONObject root)
+			throws JSONException {
 		MetadataHolder<String, ProjectType> result = new MetadataHolder<String, ProjectType>();
 		if (!root.has(TYPE_EL)) {
 			return result;
@@ -158,7 +162,7 @@ class InitializrServiceMetadata {
 		return result;
 	}
 
-	private Map<String, String> parseDefaults(JSONObject root) {
+	private Map<String, String> parseDefaults(JSONObject root) throws JSONException {
 		Map<String, String> result = new HashMap<String, String>();
 		Iterator<?> keys = root.keys();
 		while (keys.hasNext()) {
@@ -174,7 +178,8 @@ class InitializrServiceMetadata {
 		return result;
 	}
 
-	private void parseGroup(JSONObject group, Map<String, Dependency> dependencies) {
+	private void parseGroup(JSONObject group, Map<String, Dependency> dependencies)
+			throws JSONException {
 		if (group.has(VALUES_EL)) {
 			JSONArray content = group.getJSONArray(VALUES_EL);
 			for (int i = 0; i < content.length(); i++) {
@@ -184,14 +189,15 @@ class InitializrServiceMetadata {
 		}
 	}
 
-	private Dependency parseDependency(JSONObject object) {
+	private Dependency parseDependency(JSONObject object) throws JSONException {
 		String id = getStringValue(object, ID_ATTRIBUTE, null);
 		String name = getStringValue(object, NAME_ATTRIBUTE, null);
 		String description = getStringValue(object, DESCRIPTION_ATTRIBUTE, null);
 		return new Dependency(id, name, description);
 	}
 
-	private ProjectType parseType(JSONObject object, String defaultId) {
+	private ProjectType parseType(JSONObject object, String defaultId)
+			throws JSONException {
 		String id = getStringValue(object, ID_ATTRIBUTE, null);
 		String name = getStringValue(object, NAME_ATTRIBUTE, null);
 		String action = getStringValue(object, ACTION_ATTRIBUTE, null);
@@ -204,14 +210,15 @@ class InitializrServiceMetadata {
 		return new ProjectType(id, name, action, defaultType, tags);
 	}
 
-	private String getStringValue(JSONObject object, String name, String defaultValue) {
+	private String getStringValue(JSONObject object, String name, String defaultValue)
+			throws JSONException {
 		return object.has(name) ? object.getString(name) : defaultValue;
 	}
 
-	private Map<String, String> parseStringItems(JSONObject json) {
+	private Map<String, String> parseStringItems(JSONObject json) throws JSONException {
 		Map<String, String> result = new HashMap<String, String>();
-		for (Object k : json.keySet()) {
-			String key = (String) k;
+		for (Iterator<?> iterator = json.keys(); iterator.hasNext();) {
+			String key = (String) iterator.next();
 			Object value = json.get(key);
 			if (value instanceof String) {
 				result.put(key, (String) value);

spring-boot-cli/src/test/java/org/springframework/boot/cli/command/init/AbstractHttpClientMockTests.java

@@ -28,6 +28,7 @@ import org.apache.http.client.methods.HttpGet;
 import org.apache.http.impl.client.CloseableHttpClient;
 import org.apache.http.message.BasicHeader;
 import org.hamcrest.Matcher;
+import org.json.JSONException;
 import org.json.JSONObject;
 import org.mockito.ArgumentMatcher;
 
@@ -95,7 +96,7 @@ public abstract class AbstractHttpClientMockTests {
 	}
 
 	protected void mockProjectGenerationError(int status, String message)
-			throws IOException {
+			throws IOException, JSONException {
 		// Required for project generation as the metadata is read first
 		mockSuccessfulMetadataGet(false);
 		CloseableHttpResponse response = mock(CloseableHttpResponse.class);
@@ -105,7 +106,8 @@ public abstract class AbstractHttpClientMockTests {
 		given(this.http.execute(isA(HttpGet.class))).willReturn(response);
 	}
 
-	protected void mockMetadataGetError(int status, String message) throws IOException {
+	protected void mockMetadataGetError(int status, String message)
+			throws IOException, JSONException {
 		CloseableHttpResponse response = mock(CloseableHttpResponse.class);
 		mockHttpEntity(response, createJsonError(status, message).getBytes(),
 				"application/json");
@@ -156,7 +158,7 @@ public abstract class AbstractHttpClientMockTests {
 		return "attachment; filename=\"" + fileName + "\"";
 	}
 
-	private String createJsonError(int status, String message) {
+	private String createJsonError(int status, String message) throws JSONException {
 		JSONObject json = new JSONObject();
 		json.put("status", status);
 		if (message != null) {

spring-boot-cli/src/test/java/org/springframework/boot/cli/command/init/InitializrServiceMetadataTests.java

@@ -20,6 +20,7 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.nio.charset.Charset;
 
+import org.json.JSONException;
 import org.json.JSONObject;
 import org.junit.Test;
 
@@ -37,7 +38,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 public class InitializrServiceMetadataTests {
 
 	@Test
-	public void parseDefaults() {
+	public void parseDefaults() throws Exception {
 		InitializrServiceMetadata metadata = createInstance("2.0.0");
 		assertThat(metadata.getDefaults().get("bootVersion")).isEqualTo("1.1.8.RELEASE");
 		assertThat(metadata.getDefaults().get("javaVersion")).isEqualTo("1.7");
@@ -55,7 +56,7 @@ public class InitializrServiceMetadataTests {
 	}
 
 	@Test
-	public void parseDependencies() {
+	public void parseDependencies() throws Exception {
 		InitializrServiceMetadata metadata = createInstance("2.0.0");
 		assertThat(metadata.getDependencies()).hasSize(5);
 
@@ -70,7 +71,7 @@ public class InitializrServiceMetadataTests {
 	}
 
 	@Test
-	public void parseTypes() {
+	public void parseTypes() throws Exception {
 		InitializrServiceMetadata metadata = createInstance("2.0.0");
 		ProjectType projectType = metadata.getProjectTypes().get("maven-project");
 		assertThat(projectType).isNotNull();
@@ -78,7 +79,8 @@ public class InitializrServiceMetadataTests {
 		assertThat(projectType.getTags().get("format")).isEqualTo("project");
 	}
 
-	private static InitializrServiceMetadata createInstance(String version) {
+	private static InitializrServiceMetadata createInstance(String version)
+			throws JSONException {
 		try {
 			return new InitializrServiceMetadata(readJson(version));
 		}
@@ -87,7 +89,7 @@ public class InitializrServiceMetadataTests {
 		}
 	}
 
-	private static JSONObject readJson(String version) throws IOException {
+	private static JSONObject readJson(String version) throws IOException, JSONException {
 		Resource resource = new ClassPathResource(
 				"metadata/service-metadata-" + version + ".json");
 		InputStream stream = resource.getInputStream();

spring-boot-cli/src/test/java/org/springframework/boot/cli/command/init/InitializrServiceTests.java

@@ -16,8 +16,6 @@
 
 package org.springframework.boot.cli.command.init;
 
-import java.io.IOException;
-
 import org.apache.http.client.methods.CloseableHttpResponse;
 import org.apache.http.client.methods.HttpGet;
 import org.junit.Rule;
@@ -42,14 +40,14 @@ public class InitializrServiceTests extends AbstractHttpClientMockTests {
 	private final InitializrService invoker = new InitializrService(this.http);
 
 	@Test
-	public void loadMetadata() throws IOException {
+	public void loadMetadata() throws Exception {
 		mockSuccessfulMetadataGet(false);
 		InitializrServiceMetadata metadata = this.invoker.loadMetadata("http://foo/bar");
 		assertThat(metadata).isNotNull();
 	}
 
 	@Test
-	public void generateSimpleProject() throws IOException {
+	public void generateSimpleProject() throws Exception {
 		ProjectGenerationRequest request = new ProjectGenerationRequest();
 		MockHttpProjectGenerationRequest mockHttpRequest = new MockHttpProjectGenerationRequest(
 				"application/xml", "foo.zip");
@@ -59,7 +57,7 @@ public class InitializrServiceTests extends AbstractHttpClientMockTests {
 	}
 
 	@Test
-	public void generateProjectCustomTargetFilename() throws IOException {
+	public void generateProjectCustomTargetFilename() throws Exception {
 		ProjectGenerationRequest request = new ProjectGenerationRequest();
 		request.setOutput("bar.zip");
 		MockHttpProjectGenerationRequest mockHttpRequest = new MockHttpProjectGenerationRequest(
@@ -69,7 +67,7 @@ public class InitializrServiceTests extends AbstractHttpClientMockTests {
 	}
 
 	@Test
-	public void generateProjectNoDefaultFileName() throws IOException {
+	public void generateProjectNoDefaultFileName() throws Exception {
 		ProjectGenerationRequest request = new ProjectGenerationRequest();
 		MockHttpProjectGenerationRequest mockHttpRequest = new MockHttpProjectGenerationRequest(
 				"application/xml", null);
@@ -78,7 +76,7 @@ public class InitializrServiceTests extends AbstractHttpClientMockTests {
 	}
 
 	@Test
-	public void generateProjectBadRequest() throws IOException {
+	public void generateProjectBadRequest() throws Exception {
 		String jsonMessage = "Unknown dependency foo:bar";
 		mockProjectGenerationError(400, jsonMessage);
 		ProjectGenerationRequest request = new ProjectGenerationRequest();
@@ -89,7 +87,7 @@ public class InitializrServiceTests extends AbstractHttpClientMockTests {
 	}
 
 	@Test
-	public void generateProjectBadRequestNoExtraMessage() throws IOException {
+	public void generateProjectBadRequestNoExtraMessage() throws Exception {
 		mockProjectGenerationError(400, null);
 		ProjectGenerationRequest request = new ProjectGenerationRequest();
 		this.thrown.expect(ReportableException.class);
@@ -98,7 +96,7 @@ public class InitializrServiceTests extends AbstractHttpClientMockTests {
 	}
 
 	@Test
-	public void generateProjectNoContent() throws IOException {
+	public void generateProjectNoContent() throws Exception {
 		mockSuccessfulMetadataGet(false);
 		CloseableHttpResponse response = mock(CloseableHttpResponse.class);
 		mockStatus(response, 500);
@@ -110,7 +108,7 @@ public class InitializrServiceTests extends AbstractHttpClientMockTests {
 	}
 
 	@Test
-	public void loadMetadataBadRequest() throws IOException {
+	public void loadMetadataBadRequest() throws Exception {
 		String jsonMessage = "whatever error on the server";
 		mockMetadataGetError(500, jsonMessage);
 		ProjectGenerationRequest request = new ProjectGenerationRequest();
@@ -120,7 +118,7 @@ public class InitializrServiceTests extends AbstractHttpClientMockTests {
 	}
 
 	@Test
-	public void loadMetadataInvalidJson() throws IOException {
+	public void loadMetadataInvalidJson() throws Exception {
 		CloseableHttpResponse response = mock(CloseableHttpResponse.class);
 		mockHttpEntity(response, "Foo-Bar-Not-JSON".getBytes(), "application/json");
 		mockStatus(response, 200);
@@ -132,7 +130,7 @@ public class InitializrServiceTests extends AbstractHttpClientMockTests {
 	}
 
 	@Test
-	public void loadMetadataNoContent() throws IOException {
+	public void loadMetadataNoContent() throws Exception {
 		CloseableHttpResponse response = mock(CloseableHttpResponse.class);
 		mockStatus(response, 500);
 		given(this.http.execute(isA(HttpGet.class))).willReturn(response);
@@ -143,7 +141,7 @@ public class InitializrServiceTests extends AbstractHttpClientMockTests {
 	}
 
 	private ProjectGenerationResponse generateProject(ProjectGenerationRequest request,
-			MockHttpProjectGenerationRequest mockRequest) throws IOException {
+			MockHttpProjectGenerationRequest mockRequest) throws Exception {
 		mockSuccessfulProjectGeneration(mockRequest);
 		ProjectGenerationResponse entity = this.invoker.generate(request);
 		assertThat(entity.getContent()).as("wrong body content")

spring-boot-cli/src/test/java/org/springframework/boot/cli/command/init/ProjectGenerationRequestTests.java

@@ -23,6 +23,7 @@ import java.nio.charset.Charset;
 import java.util.Collections;
 import java.util.Map;
 
+import org.json.JSONException;
 import org.json.JSONObject;
 import org.junit.Rule;
 import org.junit.Test;
@@ -169,7 +170,7 @@ public class ProjectGenerationRequestTests {
 	}
 
 	@Test
-	public void buildNoMatch() {
+	public void buildNoMatch() throws Exception {
 		InitializrServiceMetadata metadata = readMetadata();
 		setBuildAndFormat("does-not-exist", null);
 		this.thrown.expect(ReportableException.class);
@@ -178,7 +179,7 @@ public class ProjectGenerationRequestTests {
 	}
 
 	@Test
-	public void buildMultipleMatch() {
+	public void buildMultipleMatch() throws Exception {
 		InitializrServiceMetadata metadata = readMetadata("types-conflict");
 		setBuildAndFormat("gradle", null);
 		this.thrown.expect(ReportableException.class);
@@ -188,7 +189,7 @@ public class ProjectGenerationRequestTests {
 	}
 
 	@Test
-	public void buildOneMatch() {
+	public void buildOneMatch() throws Exception {
 		InitializrServiceMetadata metadata = readMetadata();
 		setBuildAndFormat("gradle", null);
 		assertThat(this.request.generateUrl(metadata))
@@ -196,7 +197,7 @@ public class ProjectGenerationRequestTests {
 	}
 
 	@Test
-	public void typeAndBuildAndFormat() {
+	public void typeAndBuildAndFormat() throws Exception {
 		InitializrServiceMetadata metadata = readMetadata();
 		setBuildAndFormat("gradle", "project");
 		this.request.setType("maven-build");
@@ -205,14 +206,14 @@ public class ProjectGenerationRequestTests {
 	}
 
 	@Test
-	public void invalidType() throws URISyntaxException {
+	public void invalidType() throws Exception {
 		this.request.setType("does-not-exist");
 		this.thrown.expect(ReportableException.class);
 		this.request.generateUrl(createDefaultMetadata());
 	}
 
 	@Test
-	public void noTypeAndNoDefault() throws URISyntaxException {
+	public void noTypeAndNoDefault() throws Exception {
 		this.thrown.expect(ReportableException.class);
 		this.thrown.expectMessage("no default is defined");
 		this.request.generateUrl(readMetadata("types-conflict"));
@@ -243,11 +244,12 @@ public class ProjectGenerationRequestTests {
 		return new InitializrServiceMetadata(projectType);
 	}
 
-	private static InitializrServiceMetadata readMetadata() {
+	private static InitializrServiceMetadata readMetadata() throws JSONException {
 		return readMetadata("2.0.0");
 	}
 
-	private static InitializrServiceMetadata readMetadata(String version) {
+	private static InitializrServiceMetadata readMetadata(String version)
+			throws JSONException {
 		try {
 			Resource resource = new ClassPathResource(
 					"metadata/service-metadata-" + version + ".json");

spring-boot-parent/pom.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 	<modelVersion>4.0.0</modelVersion>
 	<parent>
 		<groupId>org.springframework.boot</groupId>
@@ -62,6 +63,11 @@
 				<artifactId>okhttp</artifactId>
 				<version>3.4.1</version>
 			</dependency>
+			<dependency>
+				<groupId>com.vaadin.external.google</groupId>
+				<artifactId>android-json</artifactId>
+				<version>0.0.20131108.vaadin1</version>
+			</dependency>
 			<dependency>
 				<groupId>io.netty</groupId>
 				<artifactId>netty-all</artifactId>

spring-boot-tools/spring-boot-configuration-metadata/pom.xml

@@ -20,8 +20,8 @@
 	<dependencies>
 		<!-- Compile (should stick to the bare minimum) -->
 		<dependency>
-			<groupId>org.json</groupId>
-			<artifactId>json</artifactId>
+			<groupId>com.vaadin.external.google</groupId>
+			<artifactId>android-json</artifactId>
 		</dependency>
 	</dependencies>
 </project>

spring-boot-tools/spring-boot-configuration-metadata/src/main/java/org/springframework/boot/configurationmetadata/ConfigurationMetadataRepositoryJsonBuilder.java

@@ -23,8 +23,6 @@ import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
 
-import org.json.JSONException;
-
 /**
  * Load a {@link ConfigurationMetadataRepository} from the content of arbitrary
  * resource(s).
@@ -104,13 +102,8 @@ public final class ConfigurationMetadataRepositoryJsonBuilder {
 			RawConfigurationMetadata metadata = this.reader.read(in, charset);
 			return create(metadata);
 		}
-		catch (IOException ex) {
-			throw new IllegalArgumentException(
-					"Failed to read configuration " + "metadata", ex);
-		}
-		catch (JSONException ex) {
-			throw new IllegalArgumentException(
-					"Invalid configuration " + "metadata document", ex);
+		catch (Exception ex) {
+			throw new IllegalStateException("Failed to read configuration metadata", ex);
 		}
 	}
 

spring-boot-tools/spring-boot-configuration-metadata/src/main/java/org/springframework/boot/configurationmetadata/JsonReader.java

@@ -41,14 +41,26 @@ class JsonReader {
 
 	public RawConfigurationMetadata read(InputStream in, Charset charset)
 			throws IOException {
-		JSONObject json = readJson(in, charset);
-		List<ConfigurationMetadataSource> groups = parseAllSources(json);
-		List<ConfigurationMetadataItem> items = parseAllItems(json);
-		List<ConfigurationMetadataHint> hints = parseAllHints(json);
-		return new RawConfigurationMetadata(groups, items, hints);
+		try {
+			JSONObject json = readJson(in, charset);
+			List<ConfigurationMetadataSource> groups = parseAllSources(json);
+			List<ConfigurationMetadataItem> items = parseAllItems(json);
+			List<ConfigurationMetadataHint> hints = parseAllHints(json);
+			return new RawConfigurationMetadata(groups, items, hints);
+		}
+		catch (Exception ex) {
+			if (ex instanceof IOException) {
+				throw (IOException) ex;
+			}
+			if (ex instanceof RuntimeException) {
+				throw (RuntimeException) ex;
+			}
+			throw new IllegalStateException(ex);
+		}
 	}
 
-	private List<ConfigurationMetadataSource> parseAllSources(JSONObject root) {
+	private List<ConfigurationMetadataSource> parseAllSources(JSONObject root)
+			throws Exception {
 		List<ConfigurationMetadataSource> result = new ArrayList<ConfigurationMetadataSource>();
 		if (!root.has("groups")) {
 			return result;
@@ -61,7 +73,8 @@ class JsonReader {
 		return result;
 	}
 
-	private List<ConfigurationMetadataItem> parseAllItems(JSONObject root) {
+	private List<ConfigurationMetadataItem> parseAllItems(JSONObject root)
+			throws Exception {
 		List<ConfigurationMetadataItem> result = new ArrayList<ConfigurationMetadataItem>();
 		if (!root.has("properties")) {
 			return result;
@@ -74,7 +87,8 @@ class JsonReader {
 		return result;
 	}
 
-	private List<ConfigurationMetadataHint> parseAllHints(JSONObject root) {
+	private List<ConfigurationMetadataHint> parseAllHints(JSONObject root)
+			throws Exception {
 		List<ConfigurationMetadataHint> result = new ArrayList<ConfigurationMetadataHint>();
 		if (!root.has("hints")) {
 			return result;
@@ -87,7 +101,7 @@ class JsonReader {
 		return result;
 	}
 
-	private ConfigurationMetadataSource parseSource(JSONObject json) {
+	private ConfigurationMetadataSource parseSource(JSONObject json) throws Exception {
 		ConfigurationMetadataSource source = new ConfigurationMetadataSource();
 		source.setGroupId(json.getString("name"));
 		source.setType(json.optString("type", null));
@@ -100,7 +114,7 @@ class JsonReader {
 		return source;
 	}
 
-	private ConfigurationMetadataItem parseItem(JSONObject json) {
+	private ConfigurationMetadataItem parseItem(JSONObject json) throws Exception {
 		ConfigurationMetadataItem item = new ConfigurationMetadataItem();
 		item.setId(json.getString("name"));
 		item.setType(json.optString("type", null));
@@ -115,7 +129,7 @@ class JsonReader {
 		return item;
 	}
 
-	private ConfigurationMetadataHint parseHint(JSONObject json) {
+	private ConfigurationMetadataHint parseHint(JSONObject json) throws Exception {
 		ConfigurationMetadataHint hint = new ConfigurationMetadataHint();
 		hint.setId(json.getString("name"));
 		if (json.has("values")) {
@@ -152,7 +166,7 @@ class JsonReader {
 		return hint;
 	}
 
-	private Deprecation parseDeprecation(JSONObject object) {
+	private Deprecation parseDeprecation(JSONObject object) throws Exception {
 		if (object.has("deprecation")) {
 			JSONObject deprecationJsonObject = object.getJSONObject("deprecation");
 			Deprecation deprecation = new Deprecation();
@@ -164,7 +178,7 @@ class JsonReader {
 		return (object.optBoolean("deprecated") ? new Deprecation() : null);
 	}
 
-	private Object readItemValue(Object value) {
+	private Object readItemValue(Object value) throws Exception {
 		if (value instanceof JSONArray) {
 			JSONArray array = (JSONArray) value;
 			Object[] content = new Object[array.length()];
@@ -176,7 +190,7 @@ class JsonReader {
 		return value;
 	}
 
-	private JSONObject readJson(InputStream in, Charset charset) throws IOException {
+	private JSONObject readJson(InputStream in, Charset charset) throws Exception {
 		try {
 			StringBuilder out = new StringBuilder();
 			InputStreamReader reader = new InputStreamReader(in, charset);

spring-boot-tools/spring-boot-configuration-metadata/src/test/java/org/springframework/boot/configurationmetadata/JsonReaderTests.java

@@ -20,6 +20,7 @@ import java.io.IOException;
 import java.nio.charset.Charset;
 import java.util.List;
 
+import org.hamcrest.CoreMatchers;
 import org.json.JSONException;
 import org.junit.Test;
 
@@ -45,7 +46,7 @@ public class JsonReaderTests extends AbstractConfigurationMetadataTests {
 
 	@Test
 	public void invalidMetadata() throws IOException {
-		this.thrown.expect(JSONException.class);
+		this.thrown.expectCause(CoreMatchers.<Throwable>instanceOf(JSONException.class));
 		readFor("invalid");
 	}
 

spring-boot-tools/spring-boot-configuration-processor/pom.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 	<modelVersion>4.0.0</modelVersion>
 	<parent>
 		<groupId>org.springframework.boot</groupId>
@@ -20,8 +21,8 @@
 	<dependencies>
  		<!-- Compile (should stick to the bare minimum) -->
  		<dependency>
-			<groupId>org.json</groupId>
-			<artifactId>json</artifactId>
+			<groupId>com.vaadin.external.google</groupId>
+			<artifactId>android-json</artifactId>
 		</dependency>
 		<!-- Test -->
 		<dependency>

spring-boot-tools/spring-boot-configuration-processor/src/main/java/org/springframework/boot/configurationprocessor/ConfigurationMetadataAnnotationProcessor.java

@@ -17,7 +17,6 @@
 package org.springframework.boot.configurationprocessor;
 
 import java.io.FileNotFoundException;
-import java.io.IOException;
 import java.io.PrintWriter;
 import java.io.StringWriter;
 import java.util.LinkedHashMap;
@@ -134,7 +133,12 @@ public class ConfigurationMetadataAnnotationProcessor extends AbstractProcessor
 			}
 		}
 		if (roundEnv.processingOver()) {
-			writeMetaData();
+			try {
+				writeMetaData();
+			}
+			catch (Exception ex) {
+				throw new IllegalStateException("Failed to write metadata", ex);
+			}
 		}
 		return false;
 	}
@@ -390,16 +394,11 @@ public class ConfigurationMetadataAnnotationProcessor extends AbstractProcessor
 		return values;
 	}
 
-	protected ConfigurationMetadata writeMetaData() {
+	protected ConfigurationMetadata writeMetaData() throws Exception {
 		ConfigurationMetadata metadata = this.metadataCollector.getMetadata();
 		metadata = mergeAdditionalMetadata(metadata);
 		if (!metadata.getItems().isEmpty()) {
-			try {
-				this.metadataStore.writeMetadata(metadata);
-			}
-			catch (IOException ex) {
-				throw new IllegalStateException("Failed to write metadata", ex);
-			}
+			this.metadataStore.writeMetadata(metadata);
 			return metadata;
 		}
 		return null;

spring-boot-tools/spring-boot-configuration-processor/src/main/java/org/springframework/boot/configurationprocessor/MetadataStore.java

@@ -27,8 +27,6 @@ import javax.tools.Diagnostic;
 import javax.tools.FileObject;
 import javax.tools.StandardLocation;
 
-import org.json.JSONException;
-
 import org.springframework.boot.configurationprocessor.metadata.ConfigurationMetadata;
 import org.springframework.boot.configurationprocessor.metadata.InvalidConfigurationMetadataException;
 import org.springframework.boot.configurationprocessor.metadata.JsonMarshaller;
@@ -87,7 +85,7 @@ public class MetadataStore {
 		catch (IOException ex) {
 			return null;
 		}
-		catch (JSONException ex) {
+		catch (Exception ex) {
 			throw new InvalidConfigurationMetadataException(
 					"Invalid additional meta-data in '" + METADATA_PATH + "': "
 							+ ex.getMessage(),

spring-boot-tools/spring-boot-configuration-processor/src/main/java/org/springframework/boot/configurationprocessor/metadata/JSONOrderedObject.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2012-2016 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.configurationprocessor.metadata;
+
+import java.util.Iterator;
+import java.util.LinkedHashSet;
+import java.util.Set;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+
+/**
+ * Extension to {@link JSONObject} that remembers the order of inserts.
+ *
+ * @author Stephane Nicoll
+ * @author Phillip Webb
+ */
+@SuppressWarnings("rawtypes")
+class JSONOrderedObject extends JSONObject {
+
+	private Set<String> keys = new LinkedHashSet<String>();
+
+	@Override
+	public JSONObject put(String key, Object value) throws JSONException {
+		this.keys.add(key);
+		return super.put(key, value);
+	}
+
+	@Override
+	public Iterator keys() {
+		return this.keys.iterator();
+	}
+
+}

spring-boot-tools/spring-boot-configuration-processor/src/main/java/org/springframework/boot/configurationprocessor/metadata/JsonConverter.java

@@ -0,0 +1,161 @@
+/*
+ * Copyright 2012-2016 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.configurationprocessor.metadata;
+
+import java.lang.reflect.Array;
+import java.util.Collection;
+import java.util.Map;
+
+import org.json.JSONArray;
+import org.json.JSONObject;
+
+import org.springframework.boot.configurationprocessor.metadata.ItemMetadata.ItemType;
+
+/**
+ * Converter to change meta-data objects into JSON objects.
+ *
+ * @author Stephane Nicoll
+ * @author Phillip Webb
+ */
+class JsonConverter {
+
+	public JSONArray toJsonArray(ConfigurationMetadata metadata, ItemType itemType)
+			throws Exception {
+		JSONArray jsonArray = new JSONArray();
+		for (ItemMetadata item : metadata.getItems()) {
+			if (item.isOfItemType(itemType)) {
+				jsonArray.put(toJsonObject(item));
+			}
+		}
+		return jsonArray;
+	}
+
+	public JSONArray toJsonArray(Collection<ItemHint> hints) throws Exception {
+		JSONArray jsonArray = new JSONArray();
+		for (ItemHint hint : hints) {
+			jsonArray.put(toJsonObject(hint));
+		}
+		return jsonArray;
+	}
+
+	public JSONObject toJsonObject(ItemMetadata item) throws Exception {
+		JSONObject jsonObject = new JSONOrderedObject();
+		jsonObject.put("name", item.getName());
+		putIfPresent(jsonObject, "type", item.getType());
+		putIfPresent(jsonObject, "description", item.getDescription());
+		putIfPresent(jsonObject, "sourceType", item.getSourceType());
+		putIfPresent(jsonObject, "sourceMethod", item.getSourceMethod());
+		Object defaultValue = item.getDefaultValue();
+		if (defaultValue != null) {
+			putDefaultValue(jsonObject, defaultValue);
+		}
+		ItemDeprecation deprecation = item.getDeprecation();
+		if (deprecation != null) {
+			jsonObject.put("deprecated", true); // backward compatibility
+			JSONObject deprecationJsonObject = new JSONObject();
+			if (deprecation.getReason() != null) {
+				deprecationJsonObject.put("reason", deprecation.getReason());
+			}
+			if (deprecation.getReplacement() != null) {
+				deprecationJsonObject.put("replacement", deprecation.getReplacement());
+			}
+			jsonObject.put("deprecation", deprecationJsonObject);
+		}
+		return jsonObject;
+	}
+
+	private JSONObject toJsonObject(ItemHint hint) throws Exception {
+		JSONObject jsonObject = new JSONOrderedObject();
+		jsonObject.put("name", hint.getName());
+		if (!hint.getValues().isEmpty()) {
+			jsonObject.put("values", getItemHintValues(hint));
+		}
+		if (!hint.getProviders().isEmpty()) {
+			jsonObject.put("providers", getItemHintProviders(hint));
+		}
+		return jsonObject;
+	}
+
+	private JSONArray getItemHintValues(ItemHint hint) throws Exception {
+		JSONArray values = new JSONArray();
+		for (ItemHint.ValueHint value : hint.getValues()) {
+			values.put(getItemHintValue(value));
+		}
+		return values;
+	}
+
+	private JSONObject getItemHintValue(ItemHint.ValueHint value) throws Exception {
+		JSONObject result = new JSONOrderedObject();
+		putHintValue(result, value.getValue());
+		putIfPresent(result, "description", value.getDescription());
+		return result;
+	}
+
+	private JSONArray getItemHintProviders(ItemHint hint) throws Exception {
+		JSONArray providers = new JSONArray();
+		for (ItemHint.ValueProvider provider : hint.getProviders()) {
+			providers.put(getItemHintProvider(provider));
+		}
+		return providers;
+	}
+
+	private JSONObject getItemHintProvider(ItemHint.ValueProvider provider)
+			throws Exception {
+		JSONObject result = new JSONOrderedObject();
+		result.put("name", provider.getName());
+		if (provider.getParameters() != null && !provider.getParameters().isEmpty()) {
+			JSONObject parameters = new JSONOrderedObject();
+			for (Map.Entry<String, Object> entry : provider.getParameters().entrySet()) {
+				parameters.put(entry.getKey(), extractItemValue(entry.getValue()));
+			}
+			result.put("parameters", parameters);
+		}
+		return result;
+	}
+
+	private void putIfPresent(JSONObject jsonObject, String name, Object value)
+			throws Exception {
+		if (value != null) {
+			jsonObject.put(name, value);
+		}
+	}
+
+	private void putHintValue(JSONObject jsonObject, Object value) throws Exception {
+		Object hintValue = extractItemValue(value);
+		jsonObject.put("value", hintValue);
+	}
+
+	private void putDefaultValue(JSONObject jsonObject, Object value) throws Exception {
+		Object defaultValue = extractItemValue(value);
+		jsonObject.put("defaultValue", defaultValue);
+	}
+
+	private Object extractItemValue(Object value) {
+		Object defaultValue = value;
+		if (value.getClass().isArray()) {
+			JSONArray array = new JSONArray();
+			int length = Array.getLength(value);
+			for (int i = 0; i < length; i++) {
+				array.put(Array.get(value, i));
+			}
+			defaultValue = array;
+
+		}
+		return defaultValue;
+	}
+
+}

spring-boot-tools/spring-boot-configuration-processor/src/main/java/org/springframework/boot/configurationprocessor/metadata/JsonMarshaller.java

@@ -20,18 +20,14 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.io.OutputStream;
-import java.lang.reflect.Array;
 import java.nio.charset.Charset;
 import java.util.ArrayList;
-import java.util.Collection;
 import java.util.HashMap;
-import java.util.LinkedHashSet;
+import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
-import java.util.Set;
 
 import org.json.JSONArray;
-import org.json.JSONException;
 import org.json.JSONObject;
 
 import org.springframework.boot.configurationprocessor.metadata.ItemMetadata.ItemType;
@@ -51,136 +47,26 @@ public class JsonMarshaller {
 
 	public void write(ConfigurationMetadata metadata, OutputStream outputStream)
 			throws IOException {
-		JSONObject object = new JSONOrderedObject();
-		object.put("groups", toJsonArray(metadata, ItemType.GROUP));
-		object.put("properties", toJsonArray(metadata, ItemType.PROPERTY));
-		object.put("hints", toJsonArray(metadata.getHints()));
-		outputStream.write(object.toString(2).getBytes(UTF_8));
-	}
-
-	private JSONArray toJsonArray(ConfigurationMetadata metadata, ItemType itemType) {
-		JSONArray jsonArray = new JSONArray();
-		for (ItemMetadata item : metadata.getItems()) {
-			if (item.isOfItemType(itemType)) {
-				jsonArray.put(toJsonObject(item));
+		try {
+			JSONObject object = new JSONOrderedObject();
+			JsonConverter converter = new JsonConverter();
+			object.put("groups", converter.toJsonArray(metadata, ItemType.GROUP));
+			object.put("properties", converter.toJsonArray(metadata, ItemType.PROPERTY));
+			object.put("hints", converter.toJsonArray(metadata.getHints()));
+			outputStream.write(object.toString(2).getBytes(UTF_8));
+		}
+		catch (Exception ex) {
+			if (ex instanceof IOException) {
+				throw (IOException) ex;
 			}
-		}
-		return jsonArray;
-	}
-
-	private JSONArray toJsonArray(Collection<ItemHint> hints) {
-		JSONArray jsonArray = new JSONArray();
-		for (ItemHint hint : hints) {
-			jsonArray.put(toJsonObject(hint));
-		}
-		return jsonArray;
-	}
-
-	private JSONObject toJsonObject(ItemMetadata item) {
-		JSONObject jsonObject = new JSONOrderedObject();
-		jsonObject.put("name", item.getName());
-		putIfPresent(jsonObject, "type", item.getType());
-		putIfPresent(jsonObject, "description", item.getDescription());
-		putIfPresent(jsonObject, "sourceType", item.getSourceType());
-		putIfPresent(jsonObject, "sourceMethod", item.getSourceMethod());
-		Object defaultValue = item.getDefaultValue();
-		if (defaultValue != null) {
-			putDefaultValue(jsonObject, defaultValue);
-		}
-		ItemDeprecation deprecation = item.getDeprecation();
-		if (deprecation != null) {
-			jsonObject.put("deprecated", true); // backward compatibility
-			JSONObject deprecationJsonObject = new JSONObject();
-			if (deprecation.getReason() != null) {
-				deprecationJsonObject.put("reason", deprecation.getReason());
+			if (ex instanceof RuntimeException) {
+				throw (RuntimeException) ex;
 			}
-			if (deprecation.getReplacement() != null) {
-				deprecationJsonObject.put("replacement", deprecation.getReplacement());
-			}
-			jsonObject.put("deprecation", deprecationJsonObject);
-		}
-		return jsonObject;
-	}
-
-	private JSONObject toJsonObject(ItemHint hint) {
-		JSONObject jsonObject = new JSONOrderedObject();
-		jsonObject.put("name", hint.getName());
-		if (!hint.getValues().isEmpty()) {
-			jsonObject.put("values", getItemHintValues(hint));
-		}
-		if (!hint.getProviders().isEmpty()) {
-			jsonObject.put("providers", getItemHintProviders(hint));
-		}
-		return jsonObject;
-	}
-
-	private JSONArray getItemHintValues(ItemHint hint) {
-		JSONArray values = new JSONArray();
-		for (ItemHint.ValueHint value : hint.getValues()) {
-			values.put(getItemHintValue(value));
-		}
-		return values;
-	}
-
-	private JSONObject getItemHintValue(ItemHint.ValueHint value) {
-		JSONObject result = new JSONOrderedObject();
-		putHintValue(result, value.getValue());
-		putIfPresent(result, "description", value.getDescription());
-		return result;
-	}
-
-	private JSONArray getItemHintProviders(ItemHint hint) {
-		JSONArray providers = new JSONArray();
-		for (ItemHint.ValueProvider provider : hint.getProviders()) {
-			providers.put(getItemHintProvider(provider));
-		}
-		return providers;
-	}
-
-	private JSONObject getItemHintProvider(ItemHint.ValueProvider provider) {
-		JSONObject result = new JSONOrderedObject();
-		result.put("name", provider.getName());
-		if (provider.getParameters() != null && !provider.getParameters().isEmpty()) {
-			JSONObject parameters = new JSONOrderedObject();
-			for (Map.Entry<String, Object> entry : provider.getParameters().entrySet()) {
-				parameters.put(entry.getKey(), extractItemValue(entry.getValue()));
-			}
-			result.put("parameters", parameters);
-		}
-		return result;
-	}
-
-	private void putIfPresent(JSONObject jsonObject, String name, Object value) {
-		if (value != null) {
-			jsonObject.put(name, value);
+			throw new IllegalStateException(ex);
 		}
 	}
 
-	private void putHintValue(JSONObject jsonObject, Object value) {
-		Object hintValue = extractItemValue(value);
-		jsonObject.put("value", hintValue);
-	}
-
-	private void putDefaultValue(JSONObject jsonObject, Object value) {
-		Object defaultValue = extractItemValue(value);
-		jsonObject.put("defaultValue", defaultValue);
-	}
-
-	private Object extractItemValue(Object value) {
-		Object defaultValue = value;
-		if (value.getClass().isArray()) {
-			JSONArray array = new JSONArray();
-			int length = Array.getLength(value);
-			for (int i = 0; i < length; i++) {
-				array.put(Array.get(value, i));
-			}
-			defaultValue = array;
-
-		}
-		return defaultValue;
-	}
-
-	public ConfigurationMetadata read(InputStream inputStream) throws IOException {
+	public ConfigurationMetadata read(InputStream inputStream) throws Exception {
 		ConfigurationMetadata metadata = new ConfigurationMetadata();
 		JSONObject object = new JSONObject(toString(inputStream));
 		JSONArray groups = object.optJSONArray("groups");
@@ -205,7 +91,8 @@ public class JsonMarshaller {
 		return metadata;
 	}
 
-	private ItemMetadata toItemMetadata(JSONObject object, ItemType itemType) {
+	private ItemMetadata toItemMetadata(JSONObject object, ItemType itemType)
+			throws Exception {
 		String name = object.getString("name");
 		String type = object.optString("type", null);
 		String description = object.optString("description", null);
@@ -217,7 +104,7 @@ public class JsonMarshaller {
 				description, defaultValue, deprecation);
 	}
 
-	private ItemDeprecation toItemDeprecation(JSONObject object) {
+	private ItemDeprecation toItemDeprecation(JSONObject object) throws Exception {
 		if (object.has("deprecation")) {
 			JSONObject deprecationJsonObject = object.getJSONObject("deprecation");
 			ItemDeprecation deprecation = new ItemDeprecation();
@@ -229,7 +116,7 @@ public class JsonMarshaller {
 		return (object.optBoolean("deprecated") ? new ItemDeprecation() : null);
 	}
 
-	private ItemHint toItemHint(JSONObject object) {
+	private ItemHint toItemHint(JSONObject object) throws Exception {
 		String name = object.getString("name");
 		List<ItemHint.ValueHint> values = new ArrayList<ItemHint.ValueHint>();
 		if (object.has("values")) {
@@ -248,19 +135,19 @@ public class JsonMarshaller {
 		return new ItemHint(name, values, providers);
 	}
 
-	private ItemHint.ValueHint toValueHint(JSONObject object) {
+	private ItemHint.ValueHint toValueHint(JSONObject object) throws Exception {
 		Object value = readItemValue(object.get("value"));
 		String description = object.optString("description", null);
 		return new ItemHint.ValueHint(value, description);
 	}
 
-	private ItemHint.ValueProvider toValueProvider(JSONObject object) {
+	private ItemHint.ValueProvider toValueProvider(JSONObject object) throws Exception {
 		String name = object.getString("name");
 		Map<String, Object> parameters = new HashMap<String, Object>();
 		if (object.has("parameters")) {
 			JSONObject parametersObject = object.getJSONObject("parameters");
-			for (Object k : parametersObject.keySet()) {
-				String key = (String) k;
+			for (Iterator<?> iterator = parametersObject.keys(); iterator.hasNext();) {
+				String key = (String) iterator.next();
 				Object value = readItemValue(parametersObject.get(key));
 				parameters.put(key, value);
 			}
@@ -268,7 +155,7 @@ public class JsonMarshaller {
 		return new ItemHint.ValueProvider(name, parameters);
 	}
 
-	private Object readItemValue(Object value) {
+	private Object readItemValue(Object value) throws Exception {
 		if (value instanceof JSONArray) {
 			JSONArray array = (JSONArray) value;
 			Object[] content = new Object[array.length()];
@@ -291,25 +178,4 @@ public class JsonMarshaller {
 		return out.toString();
 	}
 
-	/**
-	 * Extension to {@link JSONObject} that remembers the order of inserts.
-	 */
-	@SuppressWarnings("rawtypes")
-	private static class JSONOrderedObject extends JSONObject {
-
-		private Set<String> keys = new LinkedHashSet<String>();
-
-		@Override
-		public JSONObject put(String key, Object value) throws JSONException {
-			this.keys.add(key);
-			return super.put(key, value);
-		}
-
-		@Override
-		public Set keySet() {
-			return this.keys;
-		}
-
-	}
-
 }

spring-boot-tools/spring-boot-configuration-processor/src/test/java/org/springframework/boot/configurationprocessor/ConfigurationMetadataAnnotationProcessorTests.java

@@ -34,6 +34,7 @@ import org.springframework.boot.configurationprocessor.metadata.ConfigurationMet
 import org.springframework.boot.configurationprocessor.metadata.ItemDeprecation;
 import org.springframework.boot.configurationprocessor.metadata.ItemHint;
 import org.springframework.boot.configurationprocessor.metadata.ItemMetadata;
+import org.springframework.boot.configurationprocessor.metadata.TestJsonConverter;
 import org.springframework.boot.configurationsample.incremental.BarProperties;
 import org.springframework.boot.configurationsample.incremental.FooProperties;
 import org.springframework.boot.configurationsample.incremental.RenamedBarProperties;
@@ -630,8 +631,9 @@ public class ConfigurationMetadataAnnotationProcessorTests {
 		JSONObject additionalMetadata = new JSONObject();
 		additionalMetadata.put("properties", properties);
 		FileWriter writer = new FileWriter(additionalMetadataFile);
-		additionalMetadata.write(writer);
+		writer.append(additionalMetadata.toString(2));
 		writer.flush();
+		writer.close();
 		ConfigurationMetadata metadata = compile(SimpleProperties.class);
 		assertThat(metadata).has(Metadata.withProperty("simple.comparator"));
 		assertThat(metadata).has(Metadata.withProperty("foo", String.class)
@@ -724,23 +726,28 @@ public class ConfigurationMetadataAnnotationProcessorTests {
 		return processor.getMetadata();
 	}
 
-	private void writeAdditionalMetadata(ItemMetadata... metadata) throws IOException {
+	private void writeAdditionalMetadata(ItemMetadata... metadata) throws Exception {
+		TestJsonConverter converter = new TestJsonConverter();
 		File additionalMetadataFile = createAdditionalMetadataFile();
 		JSONObject additionalMetadata = new JSONObject();
-		additionalMetadata.put("properties", metadata);
+		JSONArray properties = new JSONArray();
+		for (ItemMetadata itemMetadata : metadata) {
+			properties.put(converter.toJsonObject(itemMetadata));
+		}
+		additionalMetadata.put("properties", properties);
 		writeMetadata(additionalMetadataFile, additionalMetadata);
 	}
 
-	private void writeAdditionalHints(ItemHint... hints) throws IOException {
+	private void writeAdditionalHints(ItemHint... hints) throws Exception {
+		TestJsonConverter converter = new TestJsonConverter();
 		File additionalMetadataFile = createAdditionalMetadataFile();
 		JSONObject additionalMetadata = new JSONObject();
-		additionalMetadata.put("hints", hints);
+		additionalMetadata.put("hints", converter.toJsonArray(Arrays.asList(hints)));
 		writeMetadata(additionalMetadataFile, additionalMetadata);
 	}
 
-	private void writePropertyDeprecation(ItemMetadata... items) throws IOException {
+	private void writePropertyDeprecation(ItemMetadata... items) throws Exception {
 		File additionalMetadataFile = createAdditionalMetadataFile();
-
 		JSONArray propertiesArray = new JSONArray();
 		for (ItemMetadata item : items) {
 			JSONObject jsonObject = new JSONObject();
@@ -776,11 +783,10 @@ public class ConfigurationMetadataAnnotationProcessorTests {
 		return additionalMetadataFile;
 	}
 
-	private void writeMetadata(File metadataFile, JSONObject metadata)
-			throws IOException {
+	private void writeMetadata(File metadataFile, JSONObject metadata) throws Exception {
 		FileWriter writer = new FileWriter(metadataFile);
 		try {
-			metadata.write(writer);
+			writer.append(metadata.toString(2));
 		}
 		finally {
 			writer.close();

spring-boot-tools/spring-boot-configuration-processor/src/test/java/org/springframework/boot/configurationprocessor/TestConfigurationMetadataAnnotationProcessor.java

@@ -70,7 +70,7 @@ public class TestConfigurationMetadataAnnotationProcessor
 	}
 
 	@Override
-	protected ConfigurationMetadata writeMetaData() {
+	protected ConfigurationMetadata writeMetaData() throws Exception {
 		super.writeMetaData();
 		try {
 			File metadataFile = new File(this.outputLocation,

spring-boot-tools/spring-boot-configuration-processor/src/test/java/org/springframework/boot/configurationprocessor/metadata/JsonMarshallerTests.java

@@ -18,7 +18,6 @@ package org.springframework.boot.configurationprocessor.metadata;
 
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
-import java.io.IOException;
 import java.io.InputStream;
 import java.util.Arrays;
 import java.util.Collections;
@@ -38,7 +37,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 public class JsonMarshallerTests {
 
 	@Test
-	public void marshallAndUnmarshal() throws IOException {
+	public void marshallAndUnmarshal() throws Exception {
 		ConfigurationMetadata metadata = new ConfigurationMetadata();
 		metadata.add(ItemMetadata.newProperty("a", "b", StringBuffer.class.getName(),
 				InputStream.class.getName(), "sourceMethod", "desc", "x",

spring-boot-tools/spring-boot-configuration-processor/src/test/java/org/springframework/boot/configurationprocessor/metadata/TestJsonConverter.java

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2012-2016 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.configurationprocessor.metadata;
+
+/**
+ * {@link JsonConverter} for use in tests.
+ *
+ * @author Phillip Webb
+ */
+public class TestJsonConverter extends JsonConverter {
+
+}