getAnnotations() is empty

Question

I would like to use annotations in my application. For this reason I create \"hello world\" for annotations:

follows example:

public class HelloAnnotatio         


        

Answer 1

Add the following to your annotation:

    @Retention(RetentionPolicy.RUNTIME)

From the javadoc for @Retention:

the retention policy defaults to RetentionPolicy.CLASS

From the javadoc for RetentionPolicy:

• CLASS
  • Annotations are to be recorded in the class file by the compiler but need not be retained by the VM at run time.
• RUNTIME
  • Annotations are to be recorded in the class file by the compiler and retained by the VM at run time, so they may be read reflectively.
• SOURCE
  • Annotations are to be discarded by the compiler.