Upgrade to Nullability Plugin 0.0.9

Closes gh-48638

module/spring-boot-jsonb/src/test/java/org/springframework/boot/jsonb/autoconfigure/jsontest/app/ExampleBasicObject.java

@@ -16,6 +16,10 @@
 
 package org.springframework.boot.jsonb.autoconfigure.jsontest.app;
 
+import java.util.Objects;
+
+import org.jspecify.annotations.Nullable;
+
 /**
  * Example object to read/write as JSON.
  *
@@ -23,9 +27,9 @@ package org.springframework.boot.jsonb.autoconfigure.jsontest.app;
  */
 public class ExampleBasicObject {
 
-	private String value;
+	private @Nullable String value;
 
-	public String getValue() {
+	public @Nullable String getValue() {
 		return this.value;
 	}
 
@@ -36,14 +40,14 @@ public class ExampleBasicObject {
 	@Override
 	public boolean equals(Object obj) {
 		if (obj != null && obj.getClass() == getClass()) {
-			return this.value.equals(((ExampleBasicObject) obj).value);
+			return Objects.equals(this.value, ((ExampleBasicObject) obj).value);
 		}
 		return false;
 	}
 
 	@Override
 	public int hashCode() {
-		return this.value.hashCode();
+		return Objects.hashCode(this.value);
 	}
 
 }

module/spring-boot-jsonb/src/test/java/org/springframework/boot/jsonb/autoconfigure/jsontest/app/package-info.java

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2012-present 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.
+ */
+
+@NullMarked
+package org.springframework.boot.jsonb.autoconfigure.jsontest.app;
+
+import org.jspecify.annotations.NullMarked;

module/spring-boot-jsonb/src/test/java/org/springframework/boot/jsonb/autoconfigure/jsontest/package-info.java

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2012-present 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.
+ */
+
+@NullMarked
+package org.springframework.boot.jsonb.autoconfigure.jsontest;
+
+import org.jspecify.annotations.NullMarked;