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What is Retention policy in java annotations?


  • A retention policy determines at what point annotation should be discarded.
  • Java defined 3 types of retention policies through java.lang.annotation.RetentionPolicy enumeration. It has SOURCE, CLASS and RUNTIME.
  • Annotation with retention policy SOURCE will be retained only with source code, and discarded during compile time.
  • Annotation with retention policy CLASS will be retained till compiling the code, and discarded during runtime.
  • Annotation with retention policy RUNTIME will be available to the JVM through runtime.
  • The retention policy will be specified by using java built-in annotation @Retention, and we have to pass the retention policy type.
  • The default retention policy type is CLASS.

package com.java2novice.annotations;

import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;

public @interface MySampleAnn {

	String name();
	String desc();

class MyAnnTest{
	@MySampleAnn(name = "test1", desc = "testing annotations")
	public void myTestMethod(){
		//method implementation
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What is race condition?
A race condition is a situation in which two or more threads or processes are reading or writing some shared data, and the final result depends on the timing of how the threads are scheduled. Race conditions can lead to unpredictable results and subtle program bugs. A thread can prevent this from happening by locking an object. When an object is locked by one thread and another thread tries to call a synchronized method on the same object, the second thread will block until the object is unlocked.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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