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The Service Provider Interfaces for developing HiveMQ plugins.

There is a newer version: 3.4.4

/*
 * Copyright 2015 dc-square GmbH
 *
 * 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.hivemq.spi.annotations;

import java.lang.annotation.*;

/**
 * An annotation which is used for indicating that something can be null.
 * This is very useful for static code analysis to prevent bugs.
 *
 * @author Dominik Obermaier
 */
@Documented
@Retention(RetentionPolicy.CLASS)
@Target({ElementType.METHOD, ElementType.FIELD, ElementType.PARAMETER, ElementType.LOCAL_VARIABLE})
public @interface Nullable {
    String value() default "";
}