Move @Nullable annotation to type declaration

Author: marcphilipp

junit-jupiter-api/src/main/java/org/junit/jupiter/api/AssertionFailureBuilder.java

@@ -32,22 +32,17 @@
 @API(status = STABLE, since = "5.9")
 public class AssertionFailureBuilder {
 
-	@Nullable
-	private Object message;
+	private @Nullable Object message;
 
-	@Nullable
-	private Throwable cause;
+	private @Nullable Throwable cause;
 
 	private boolean mismatch;
 
-	@Nullable
-	private Object expected;
+	private @Nullable Object expected;
 
-	@Nullable
-	private Object actual;
+	private @Nullable Object actual;
 
-	@Nullable
-	private String reason;
+	private @Nullable String reason;
 
 	private boolean includeValuesInMessage = true;
 

junit-jupiter-api/src/main/java/org/junit/jupiter/api/DynamicNode.java

@@ -34,8 +34,7 @@ public abstract class DynamicNode {
 	private final String displayName;
 
 	/** Custom test source {@link URI} associated with this node; potentially {@code null}. */
-	@Nullable
-	private final URI testSourceUri;
+	private final @Nullable URI testSourceUri;
 
 	DynamicNode(String displayName, @Nullable URI testSourceUri) {
 		this.displayName = Preconditions.notBlank(displayName, "displayName must not be null or blank");

junit-jupiter-api/src/main/java/org/junit/jupiter/api/condition/OS.java

@@ -95,8 +95,7 @@ public enum OS {
 
 	private static final Logger logger = LoggerFactory.getLogger(OS.class);
 
-	@Nullable
-	private static final OS CURRENT_OS = determineCurrentOs();
+	private static final @Nullable OS CURRENT_OS = determineCurrentOs();
 
 	/**
 	 * {@return the current operating system, if known; otherwise, {@code null}}

junit-jupiter-engine/src/main/java/org/junit/jupiter/engine/descriptor/AbstractExtensionContext.java

@@ -55,8 +55,7 @@ abstract class AbstractExtensionContext<T extends TestDescriptor> implements Ext
 
 	private static final Logger LOGGER = LoggerFactory.getLogger(AbstractExtensionContext.class);
 
-	@Nullable
-	private final ExtensionContext parent;
+	private final @Nullable ExtensionContext parent;
 	private final EngineExecutionListener engineExecutionListener;
 	private final T testDescriptor;
 	private final Set<String> tags;

junit-jupiter-engine/src/main/java/org/junit/jupiter/engine/descriptor/ClassBasedTestDescriptor.java

@@ -93,11 +93,9 @@ public abstract class ClassBasedTestDescriptor extends JupiterTestDescriptor
 
 	protected final ClassInfo classInfo;
 
-	@Nullable
-	private LifecycleMethods lifecycleMethods;
+	private @Nullable LifecycleMethods lifecycleMethods;
 
-	@Nullable
-	private TestInstanceFactory testInstanceFactory;
+	private @Nullable TestInstanceFactory testInstanceFactory;
 
 	ClassBasedTestDescriptor(UniqueId uniqueId, Class<?> testClass, Supplier<String> displayNameSupplier,
 			JupiterConfiguration configuration) {

junit-jupiter-engine/src/main/java/org/junit/jupiter/engine/descriptor/ClassExtensionContext.java

@@ -34,8 +34,7 @@ final class ClassExtensionContext extends AbstractExtensionContext<ClassBasedTes
 
 	private final ThrowableCollector throwableCollector;
 
-	@Nullable
-	private TestInstances testInstances;
+	private @Nullable TestInstances testInstances;
 
 	ClassExtensionContext(ExtensionContext parent, EngineExecutionListener engineExecutionListener,
 			ClassBasedTestDescriptor testDescriptor, Lifecycle lifecycle, JupiterConfiguration configuration,

junit-jupiter-engine/src/main/java/org/junit/jupiter/engine/descriptor/ClassTemplateInvocationTestDescriptor.java

@@ -49,8 +49,7 @@ public class ClassTemplateInvocationTestDescriptor extends JupiterTestDescriptor
 
 	private final ClassTemplateTestDescriptor parent;
 
-	@Nullable
-	private ClassTemplateInvocationContext invocationContext;
+	private @Nullable ClassTemplateInvocationContext invocationContext;
 
 	private final int index;
 

junit-jupiter-engine/src/main/java/org/junit/jupiter/engine/descriptor/DynamicTestTestDescriptor.java

@@ -38,8 +38,7 @@ class DynamicTestTestDescriptor extends DynamicNodeTestDescriptor {
 
 	private static final InvocationInterceptorChain interceptorChain = new InvocationInterceptorChain();
 
-	@Nullable
-	private DynamicTest dynamicTest;
+	private @Nullable DynamicTest dynamicTest;
 
 	DynamicTestTestDescriptor(UniqueId uniqueId, int index, DynamicTest dynamicTest, @Nullable TestSource source,
 			JupiterConfiguration configuration) {

junit-jupiter-engine/src/main/java/org/junit/jupiter/engine/descriptor/MethodExtensionContext.java

@@ -32,8 +32,7 @@ final class MethodExtensionContext extends AbstractExtensionContext<TestMethodTe
 
 	private final ThrowableCollector throwableCollector;
 
-	@Nullable
-	private TestInstances testInstances;
+	private @Nullable TestInstances testInstances;
 
 	MethodExtensionContext(ExtensionContext parent, EngineExecutionListener engineExecutionListener,
 			TestMethodTestDescriptor testDescriptor, JupiterConfiguration configuration,

junit-jupiter-engine/src/main/java/org/junit/jupiter/engine/descriptor/TestTemplateExtensionContext.java

@@ -29,8 +29,7 @@
  */
 final class TestTemplateExtensionContext extends AbstractExtensionContext<TestTemplateTestDescriptor> {
 
-	@Nullable
-	private final TestInstances testInstances;
+	private final @Nullable TestInstances testInstances;
 
 	TestTemplateExtensionContext(ExtensionContext parent, EngineExecutionListener engineExecutionListener,
 			TestTemplateTestDescriptor testDescriptor, JupiterConfiguration configuration,