Merge branch '2.6.x' into 2.7.x

Closes gh-30433

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/graphql/GraphQlMetricsInstrumentation.java

@@ -33,7 +33,6 @@ import io.micrometer.core.instrument.Tag;
 import io.micrometer.core.instrument.Timer;
 
 import org.springframework.boot.actuate.metrics.AutoTimer;
-import org.springframework.lang.Nullable;
 
 /**
  * Micrometer-based {@link SimpleInstrumentation}.
@@ -117,7 +116,7 @@ public class GraphQlMetricsInstrumentation extends SimpleInstrumentation {
 	}
 
 	private void recordDataFetcherMetric(Timer.Sample sample, DataFetcher<?> dataFetcher,
-			InstrumentationFieldFetchParameters parameters, @Nullable Throwable throwable) {
+			InstrumentationFieldFetchParameters parameters, Throwable throwable) {
 		Timer.Builder timer = this.autoTimer.builder("graphql.datafetcher");
 		timer.tags(this.tagsProvider.getDataFetchingTags(dataFetcher, parameters, throwable));
 		sample.stop(timer.register(this.registry));

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/graphql/GraphQlTags.java

@@ -27,7 +27,6 @@ import graphql.execution.instrumentation.parameters.InstrumentationFieldFetchPar
 import graphql.schema.GraphQLObjectType;
 import io.micrometer.core.instrument.Tag;
 
-import org.springframework.lang.Nullable;
 import org.springframework.util.CollectionUtils;
 
 /**
@@ -48,7 +47,7 @@ public final class GraphQlTags {
 
 	}
 
-	public static Tag executionOutcome(ExecutionResult result, @Nullable Throwable exception) {
+	public static Tag executionOutcome(ExecutionResult result, Throwable exception) {
 		if (exception == null && result.getErrors().isEmpty()) {
 			return OUTCOME_SUCCESS;
 		}
@@ -84,7 +83,7 @@ public final class GraphQlTags {
 		return Tag.of("errorPath", builder.toString());
 	}
 
-	public static Tag dataFetchingOutcome(@Nullable Throwable exception) {
+	public static Tag dataFetchingOutcome(Throwable exception) {
 		return (exception != null) ? OUTCOME_ERROR : OUTCOME_SUCCESS;
 	}
 

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/graphql/GraphQlTagsContributor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2020-2021 the original author or authors.
+ * Copyright 2020-2022 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.
@@ -23,8 +23,6 @@ import graphql.execution.instrumentation.parameters.InstrumentationFieldFetchPar
 import graphql.schema.DataFetcher;
 import io.micrometer.core.instrument.Tag;
 
-import org.springframework.lang.Nullable;
-
 /**
  * A contributor of {@link Tag Tags} for Spring GraphQL-based request handling. Typically,
  * used by a {@link GraphQlTagsProvider} to provide tags in addition to its defaults.
@@ -35,11 +33,11 @@ import org.springframework.lang.Nullable;
 public interface GraphQlTagsContributor {
 
 	Iterable<Tag> getExecutionTags(InstrumentationExecutionParameters parameters, ExecutionResult result,
-			@Nullable Throwable exception);
+			Throwable exception);
 
 	Iterable<Tag> getErrorTags(InstrumentationExecutionParameters parameters, GraphQLError error);
 
 	Iterable<Tag> getDataFetchingTags(DataFetcher<?> dataFetcher, InstrumentationFieldFetchParameters parameters,
-			@Nullable Throwable exception);
+			Throwable exception);
 
 }

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/graphql/GraphQlTagsProvider.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2020-2021 the original author or authors.
+ * Copyright 2020-2022 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.
@@ -23,8 +23,6 @@ import graphql.execution.instrumentation.parameters.InstrumentationFieldFetchPar
 import graphql.schema.DataFetcher;
 import io.micrometer.core.instrument.Tag;
 
-import org.springframework.lang.Nullable;
-
 /**
  * Provides {@link Tag Tags} for Spring GraphQL-based request handling.
  *
@@ -34,11 +32,11 @@ import org.springframework.lang.Nullable;
 public interface GraphQlTagsProvider {
 
 	Iterable<Tag> getExecutionTags(InstrumentationExecutionParameters parameters, ExecutionResult result,
-			@Nullable Throwable exception);
+			Throwable exception);
 
 	Iterable<Tag> getErrorTags(InstrumentationExecutionParameters parameters, GraphQLError error);
 
 	Iterable<Tag> getDataFetchingTags(DataFetcher<?> dataFetcher, InstrumentationFieldFetchParameters parameters,
-			@Nullable Throwable exception);
+			Throwable exception);
 
 }

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/annotation/ImportCandidates.java

@@ -27,8 +27,6 @@ import java.util.Enumeration;
 import java.util.Iterator;
 import java.util.List;
 
-import org.jetbrains.annotations.NotNull;
-
 import org.springframework.core.io.UrlResource;
 import org.springframework.util.Assert;
 
@@ -54,7 +52,6 @@ public final class ImportCandidates implements Iterable<String> {
 		this.candidates = Collections.unmodifiableList(candidates);
 	}
 
-	@NotNull
 	@Override
 	public Iterator<String> iterator() {
 		return this.candidates.iterator();

src/checkstyle/checkstyle.xml

@@ -13,7 +13,8 @@
 			name="com.puppycrawl.tools.checkstyle.checks.imports.IllegalImportCheck">
 			<property name="regexp" value="true" />
 			<property name="illegalPkgs"
-				value="^sun.*, ^org\.apache\.commons\.(?!compress|dbcp2|logging|pool2).*, ^com\.datastax\.oss\.driver\.shaded.*, ^com\.google\.common.*, ^io\.micrometer\.shaded.*, ^org\.testcontainers\.shaded.*" />
+				value="^sun.*, ^org\.apache\.commons\.(?!compress|dbcp2|logging|pool2).*, ^com\.datastax\.oss\.driver\.shaded.*, ^com\.google\.common.*, ^io\.micrometer\.shaded.*,
+				 ^org\.jetbrains\.annotations.*, ^org\.testcontainers\.shaded.*" />
 			<property name="illegalClasses"
 				value="^com\.hazelcast\.util\.Base64, ^org\.junit\.rules\.ExpectedException, ^org\.mockito\.InjectMocks, ^org\.slf4j\.LoggerFactory, ^org.springframework.context.annotation.ScannedGenericBeanDefinition, ^reactor\.core\.support\.Assert"/>
 		</module>

src/checkstyle/import-control.xml

@@ -2,6 +2,7 @@
 <!DOCTYPE import-control PUBLIC "-//Checkstyle//DTD ImportControl Configuration 1.4//EN" "https://checkstyle.org/dtds/import_control_1_4.dtd">
 <import-control pkg="org.springframework.boot">
 	<disallow pkg="io.micrometer" />
+	<disallow pkg="org.springframework.lang" />
 	<allow pkg=".*" regex="true" />
 	<subpackage name="autoconfigure">
 		<disallow class="org.springframework.boot.autoconfigure.jdbc.DataSourceProperties"/>
@@ -45,6 +46,13 @@
 		<subpackage name="endpoint">
 			<disallow pkg="org.springframework.http" />
 			<disallow pkg="org.springframework.web" />
+			<subpackage name="invoke">
+				<subpackage name="reflect">
+					<file name="OperationMethodParameter">
+						<allow pkg="org.springframework.lang"/>
+					</file>
+				</subpackage>
+			</subpackage>
 			<subpackage name="web">
 				<allow pkg="org.springframework.http" />
 				<allow pkg="org.springframework.web" />
@@ -56,6 +64,9 @@
 				</subpackage>
 			</subpackage>
 		</subpackage>
+		<file name=".*Endpoint(WebExtension)?" regex="true">
+			<allow pkg="org.springframework.lang"/>
+		</file>
 	</subpackage>
 
 	<subpackage name="docs">