Add MissingParametersFailureAnalyzer

Add a new failure analyzer that provides hints whenever parameter
names cannot be discovered.

Closes gh-38603

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/diagnostics/analyzer/BindFailureAnalyzer.java

@@ -49,15 +49,20 @@ class BindFailureAnalyzer extends AbstractFailureAnalyzer<BindException> {
 				|| rootCause instanceof UnboundConfigurationPropertiesException) {
 			return null;
 		}
-		return analyzeGenericBindException(cause);
+		return analyzeGenericBindException(rootFailure, cause);
 	}
 
-	private FailureAnalysis analyzeGenericBindException(BindException cause) {
+	private FailureAnalysis analyzeGenericBindException(Throwable rootFailure, BindException cause) {
+		FailureAnalysis missingParametersAnalysis = MissingParameterNamesFailureAnalyzer
+			.analyzeForMissingParameters(rootFailure);
 		StringBuilder description = new StringBuilder(String.format("%s:%n", cause.getMessage()));
 		ConfigurationProperty property = cause.getProperty();
 		buildDescription(description, property);
 		description.append(String.format("%n    Reason: %s", getMessage(cause)));
-		return getFailureAnalysis(description, cause);
+		if (missingParametersAnalysis != null) {
+			MissingParameterNamesFailureAnalyzer.appendPossibility(description);
+		}
+		return getFailureAnalysis(description.toString(), cause, missingParametersAnalysis);
 	}
 
 	private void buildDescription(StringBuilder description, ConfigurationProperty property) {
@@ -98,14 +103,18 @@ class BindFailureAnalyzer extends AbstractFailureAnalyzer<BindException> {
 		return ex.getClass().getName() + (StringUtils.hasText(message) ? ": " + message : "");
 	}
 
-	private FailureAnalysis getFailureAnalysis(Object description, BindException cause) {
-		StringBuilder message = new StringBuilder("Update your application's configuration");
+	private FailureAnalysis getFailureAnalysis(String description, BindException cause,
+			FailureAnalysis missingParametersAnalysis) {
+		StringBuilder action = new StringBuilder("Update your application's configuration");
 		Collection<String> validValues = findValidValues(cause);
 		if (!validValues.isEmpty()) {
-			message.append(String.format(". The following values are valid:%n"));
-			validValues.forEach((value) -> message.append(String.format("%n    %s", value)));
+			action.append(String.format(". The following values are valid:%n"));
+			validValues.forEach((value) -> action.append(String.format("%n    %s", value)));
 		}
-		return new FailureAnalysis(description.toString(), message.toString(), cause);
+		if (missingParametersAnalysis != null) {
+			action.append(String.format("%n%n%s", missingParametersAnalysis.getAction()));
+		}
+		return new FailureAnalysis(description, action.toString(), cause);
 	}
 
 	private Collection<String> findValidValues(BindException ex) {

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/diagnostics/analyzer/MissingParameterNamesFailureAnalyzer.java

@@ -0,0 +1,116 @@
+/*
+ * Copyright 2012-2023 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
+ *
+ *      https://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.diagnostics.analyzer;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import org.springframework.boot.diagnostics.FailureAnalysis;
+import org.springframework.boot.diagnostics.FailureAnalyzer;
+import org.springframework.core.Ordered;
+import org.springframework.core.annotation.Order;
+import org.springframework.util.StringUtils;
+
+/**
+ * {@link FailureAnalyzer} for exceptions caused by missing parameter names. This analyzer
+ * is ordered last, if other analyzers wish to also report parameter actions they can use
+ * the {@link #analyzeForMissingParameters(Throwable)} static method.
+ *
+ * @author Phillip Webb
+ */
+@Order(Ordered.LOWEST_PRECEDENCE)
+class MissingParameterNamesFailureAnalyzer implements FailureAnalyzer {
+
+	private static final String USE_PARAMETERS_MESSAGE = "Ensure that the compiler uses the '-parameters' flag";
+
+	static final String POSSIBILITY = "This may be due to missing parameter name information";
+
+	static String ACTION = """
+			Ensure that your compiler is configured to use the '-parameters' flag.
+			You may need to update both your build tool settings as well as your IDE.
+			(See https://github.com/spring-projects/spring-framework/wiki/Upgrading-to-Spring-Framework-6.x#parameter-name-retention)
+							""";
+
+	@Override
+	public FailureAnalysis analyze(Throwable failure) {
+		return analyzeForMissingParameters(failure);
+	}
+
+	/**
+	 * Analyze the given failure for missing parameter name exceptions.
+	 * @param failure the failure to analyze
+	 * @return a failure analysis or {@code null}
+	 */
+	static FailureAnalysis analyzeForMissingParameters(Throwable failure) {
+		return analyzeForMissingParameters(failure, failure, new HashSet<>());
+	}
+
+	private static FailureAnalysis analyzeForMissingParameters(Throwable rootFailure, Throwable cause,
+			Set<Throwable> seen) {
+		if (cause != null && seen.add(cause)) {
+			if (isSpringParametersException(cause)) {
+				return getAnalysis(rootFailure, cause);
+			}
+			FailureAnalysis analysis = analyzeForMissingParameters(rootFailure, cause.getCause(), seen);
+			if (analysis != null) {
+				return analysis;
+			}
+			for (Throwable suppressed : cause.getSuppressed()) {
+				analysis = analyzeForMissingParameters(rootFailure, suppressed, seen);
+				if (analysis != null) {
+					return analysis;
+				}
+			}
+		}
+		return null;
+	}
+
+	private static boolean isSpringParametersException(Throwable failure) {
+		String message = failure.getMessage();
+		return message != null && message.contains(USE_PARAMETERS_MESSAGE) && isSpringException(failure);
+	}
+
+	private static boolean isSpringException(Throwable failure) {
+		StackTraceElement[] elements = failure.getStackTrace();
+		return elements.length > 0 && isSpringClass(elements[0].getClassName());
+	}
+
+	private static boolean isSpringClass(String className) {
+		return className != null && className.startsWith("org.springframework.");
+	}
+
+	private static FailureAnalysis getAnalysis(Throwable rootFailure, Throwable cause) {
+		StringBuilder description = new StringBuilder(String.format("%s:%n", cause.getMessage()));
+		if (rootFailure != cause) {
+			description.append(String.format("%n    Resulting Failure: %s", getExceptionTypeAndMessage(rootFailure)));
+		}
+		return new FailureAnalysis(description.toString(), ACTION, rootFailure);
+	}
+
+	private static String getExceptionTypeAndMessage(Throwable ex) {
+		String message = ex.getMessage();
+		return ex.getClass().getName() + (StringUtils.hasText(message) ? ": " + message : "");
+	}
+
+	public static void appendPossibility(StringBuilder description) {
+		if (!description.toString().endsWith(System.lineSeparator())) {
+			description.append("%n".formatted());
+		}
+		description.append("%n%s".formatted(POSSIBILITY));
+	}
+
+}

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/diagnostics/analyzer/MissingParametersFailureAnalyzer.java

@@ -0,0 +1,83 @@
+/*
+ * Copyright 2012-2023 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
+ *
+ *      https://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.diagnostics.analyzer;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import org.springframework.boot.diagnostics.FailureAnalysis;
+import org.springframework.boot.diagnostics.FailureAnalyzer;
+import org.springframework.core.Ordered;
+import org.springframework.core.annotation.Order;
+
+/**
+ * @author Phillip Webb
+ */
+@Order(Ordered.HIGHEST_PRECEDENCE)
+class MissingParametersFailureAnalyzer implements FailureAnalyzer {
+
+	private static final String USE_PARAMETERS_MESSAGE = "Ensure that the compiler uses the '-parameters' flag";
+
+	@Override
+	public FailureAnalysis analyze(Throwable failure) {
+		return analyze(failure, failure, new HashSet<>());
+	}
+
+	private FailureAnalysis analyze(Throwable rootFailure, Throwable cause, Set<Throwable> seen) {
+		if (cause == null || !seen.add(cause)) {
+			return null;
+		}
+		if (isSpringParametersException(cause)) {
+			return getAnalysis(rootFailure, cause);
+		}
+		FailureAnalysis analysis = analyze(rootFailure, cause.getCause(), seen);
+		if (analysis != null) {
+			return analysis;
+		}
+		for (Throwable suppressed : cause.getSuppressed()) {
+			analysis = analyze(rootFailure, suppressed, seen);
+			if (analysis != null) {
+				return analysis;
+			}
+		}
+		return null;
+	}
+
+	private boolean isSpringParametersException(Throwable failure) {
+		String message = failure.getMessage();
+		return message != null && message.contains(USE_PARAMETERS_MESSAGE) && isSpringException(failure);
+	}
+
+	private boolean isSpringException(Throwable failure) {
+		StackTraceElement[] elements = failure.getStackTrace();
+		return elements.length > 0 && isSpringClass(elements[0].getClassName());
+	}
+
+	private boolean isSpringClass(String className) {
+		return className != null && className.startsWith("org.springframework.");
+	}
+
+	private FailureAnalysis getAnalysis(Throwable rootFailure, Throwable cause) {
+		String description = "";
+		if (rootFailure != cause) {
+
+		}
+		String action = "";
+		return new FailureAnalysis(description, action, rootFailure);
+	}
+
+}

spring-boot-project/spring-boot/src/main/resources/META-INF/spring.factories

@@ -70,6 +70,7 @@ org.springframework.boot.diagnostics.analyzer.BeanNotOfRequiredTypeFailureAnalyz
 org.springframework.boot.diagnostics.analyzer.BindFailureAnalyzer,\
 org.springframework.boot.diagnostics.analyzer.BindValidationFailureAnalyzer,\
 org.springframework.boot.diagnostics.analyzer.UnboundConfigurationPropertyFailureAnalyzer,\
+org.springframework.boot.diagnostics.analyzer.MissingParameterNamesFailureAnalyzer,\
 org.springframework.boot.diagnostics.analyzer.MutuallyExclusiveConfigurationPropertiesFailureAnalyzer,\
 org.springframework.boot.diagnostics.analyzer.NoSuchMethodFailureAnalyzer,\
 org.springframework.boot.diagnostics.analyzer.NoUniqueBeanDefinitionFailureAnalyzer,\

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/diagnostics/analyzer/BindFailureAnalyzerTests.java

@@ -99,6 +99,19 @@ class BindFailureAnalyzerTests {
 						+ "org.springframework.boot.logging.LogLevel>]"));
 	}
 
+	@Test
+	void bindExceptionWithSupressedMissingParametersException() {
+		BeanCreationException failure = createFailure(GenericFailureConfiguration.class, "test.foo.value=alpha");
+		failure.addSuppressed(new IllegalStateException(
+				"Missing parameter names. Ensure that the compiler uses the '-parameters' flag"));
+		FailureAnalysis analysis = new BindFailureAnalyzer().analyze(failure);
+		assertThat(analysis.getDescription())
+			.contains(failure("test.foo.value", "alpha", "\"test.foo.value\" from property source \"test\"",
+					"failed to convert java.lang.String to int"))
+			.contains(MissingParameterNamesFailureAnalyzer.POSSIBILITY);
+		assertThat(analysis.getAction()).contains(MissingParameterNamesFailureAnalyzer.ACTION);
+	}
+
 	private static String failure(String property, String value, String origin, String reason) {
 		return String.format("Property: %s%n    Value: \"%s\"%n    Origin: %s%n    Reason: %s", property, value, origin,
 				reason);

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/diagnostics/analyzer/MissingParameterNamesFailureAnalyzerTests.java

@@ -0,0 +1,123 @@
+/*
+ * Copyright 2012-2023 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
+ *
+ *      https://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.diagnostics.analyzer;
+
+import java.lang.reflect.Method;
+
+import org.junit.jupiter.api.Test;
+
+import org.springframework.boot.diagnostics.FailureAnalysis;
+import org.springframework.core.MethodParameter;
+import org.springframework.web.context.request.NativeWebRequest;
+import org.springframework.web.method.annotation.AbstractNamedValueMethodArgumentResolver;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link MissingParameterNamesFailureAnalyzer}.
+ *
+ * @author Phillip Webb
+ */
+class MissingParameterNamesFailureAnalyzerTests {
+
+	@Test
+	void analyzeWhenMissingParametersExceptionReturnsFailure() throws Exception {
+		MissingParameterNamesFailureAnalyzer analyzer = new MissingParameterNamesFailureAnalyzer();
+		FailureAnalysis analysis = analyzer.analyze(getSpringFrameworkMissingParameterException());
+		assertThat(analysis.getDescription())
+			.isEqualTo(String.format("Name for argument of type [java.lang.String] not specified, and parameter name "
+					+ "information not available via reflection. Ensure that the compiler uses the '-parameters' flag.:%n"));
+		assertThat(analysis.getAction()).isEqualTo(MissingParameterNamesFailureAnalyzer.ACTION);
+	}
+
+	@Test
+	void analyzeForMissingParametersWhenMissingParametersExceptionReturnsFailure() throws Exception {
+		FailureAnalysis analysis = MissingParameterNamesFailureAnalyzer
+			.analyzeForMissingParameters(getSpringFrameworkMissingParameterException());
+		assertThat(analysis.getDescription())
+			.isEqualTo(String.format("Name for argument of type [java.lang.String] not specified, and parameter name "
+					+ "information not available via reflection. Ensure that the compiler uses the '-parameters' flag.:%n"));
+		assertThat(analysis.getAction()).isEqualTo(MissingParameterNamesFailureAnalyzer.ACTION);
+	}
+
+	@Test
+	void analyzeForMissingParametersWhenInCauseReturnsFailure() throws Exception {
+		RuntimeException exception = new RuntimeException("Badness", getSpringFrameworkMissingParameterException());
+		FailureAnalysis analysis = MissingParameterNamesFailureAnalyzer.analyzeForMissingParameters(exception);
+		assertThat(analysis.getDescription())
+			.isEqualTo(String.format("Name for argument of type [java.lang.String] not specified, and parameter name "
+					+ "information not available via reflection. Ensure that the compiler uses the '-parameters' flag.:%n%n"
+					+ "    Resulting Failure: java.lang.RuntimeException: Badness"));
+		assertThat(analysis.getAction()).isEqualTo(MissingParameterNamesFailureAnalyzer.ACTION);
+	}
+
+	@Test
+	void analyzeForMissingParametersWhenInSuppressedReturnsFailure() throws Exception {
+		RuntimeException exception = new RuntimeException("Badness");
+		exception.addSuppressed(getSpringFrameworkMissingParameterException());
+		FailureAnalysis analysis = MissingParameterNamesFailureAnalyzer.analyzeForMissingParameters(exception);
+		assertThat(analysis.getDescription())
+			.isEqualTo(String.format("Name for argument of type [java.lang.String] not specified, and parameter name "
+					+ "information not available via reflection. Ensure that the compiler uses the '-parameters' flag.:%n%n"
+					+ "    Resulting Failure: java.lang.RuntimeException: Badness"));
+		assertThat(analysis.getAction()).isEqualTo(MissingParameterNamesFailureAnalyzer.ACTION);
+	}
+
+	@Test
+	void analyzeForMissingParametersWhenNotPresentReturnsNull() {
+		RuntimeException exception = new RuntimeException("Badness");
+		FailureAnalysis analysis = MissingParameterNamesFailureAnalyzer.analyzeForMissingParameters(exception);
+		assertThat(analysis).isNull();
+	}
+
+	private RuntimeException getSpringFrameworkMissingParameterException() throws Exception {
+		MockResolver resolver = new MockResolver();
+		Method method = getClass().getDeclaredMethod("example", String.class);
+		MethodParameter parameter = new MethodParameter(method, 0);
+		try {
+			resolver.resolveArgument(parameter, null, null, null);
+		}
+		catch (RuntimeException ex) {
+			return ex;
+		}
+		throw new AssertionError("Did not throw");
+	}
+
+	void example(String name) {
+	}
+
+	static class MockResolver extends AbstractNamedValueMethodArgumentResolver {
+
+		@Override
+		public boolean supportsParameter(MethodParameter parameter) {
+			return true;
+		}
+
+		@Override
+		protected NamedValueInfo createNamedValueInfo(MethodParameter parameter) {
+			return new NamedValueInfo("", false, null);
+		}
+
+		@Override
+		protected Object resolveName(String name, MethodParameter parameter, NativeWebRequest request)
+				throws Exception {
+			return null;
+		}
+
+	}
+
+}