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src/main/java/javax/annotation/ParametersAreNullableByDefault.java

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+package javax.annotation;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+
+import javax.annotation.meta.TypeQualifierDefault;
+
+/**
+ * This annotation can be applied to a package, class or method to indicate that
+ * the method parameters in that element are nullable by default unless there
+ * is:
+ * <ul>
+ * <li>An explicit nullness annotation
+ * <li>The method overrides a method in a superclass (in which case the
+ * annotation of the corresponding parameter in the superclass applies)
+ * <li>There is a default parameter annotation applied to a more tightly nested
+ * element.
+ * </ul>
+ * <p>
+ * This annotation implies the same "nullness" as no annotation. However, it is
+ * different than having no annotation, as it is inherited and it can override a
+ * {@link ParametersAreNonnullByDefault} annotation at an outer scope.
+ *
+ * @see Nullable
+ */
+@Documented
+@Nullable
+@TypeQualifierDefault(ElementType.PARAMETER)
+@Retention(RetentionPolicy.RUNTIME)
+public @interface ParametersAreNullableByDefault {
+}