NullablePrimitive
@Nullable should not be used for primitive types since they cannot be null

Category
JDK
Severity
WARNING
Maturity

The problem

Primitives can never be null.

Suppression

Suppress false positives by adding an @SuppressWarnings("NullablePrimitive") annotation to the enclosing element.


Positive examples

NullablePrimitivePositiveCases.java

/*
 * Copyright 2015 Google Inc. All Rights Reserved.
 *
 * 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
 *
 *     http://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 com.google.errorprone.bugpatterns.testdata;

import javax.annotation.Nullable;

/**
 * @author sebastian.h.monte@gmail.com (Sebastian Monte)
 */
public class NullablePrimitivePositiveCases {

  // BUG: Diagnostic contains: remove
  @Nullable
  int a;

  public void method(
      // BUG: Diagnostic contains: remove
      @Nullable
      int a) {
  }

  // BUG: Diagnostic contains: remove
  @Nullable
  public int method() {
    return 0;
  }
}

Negative examples

NullablePrimitiveNegativeCases.java

/*
 * Copyright 2015 Google Inc. All Rights Reserved.
 *
 * 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
 *
 *     http://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 com.google.errorprone.bugpatterns.testdata;

import javax.annotation.Nullable;

/**
 * @author sebastian.h.monte@gmail.com (Sebastian Monte)
 */
public class NullablePrimitiveNegativeCases {
  @Nullable
  Integer a;

  public void method(@Nullable Integer a) {}

  @Nullable
  public Integer method() {
    return new Integer(0);
  }
}