Problem in java annotation

**Remedy** · 28-02-2010

Hello,
I am currently testing the annotations in Java, , but I think this is not working for me. If you have any idea about this then please help me. I think I have not quite understood the concept of the java annotations. I think I do not know or I am confuse why annotations are made in java. If you an explain me this then it would be great. Thanks in advance.

**Gunner 1** · 28-02-2010

Hello,
Even I have a same problem with java annotations. This is my code, please check where I am wrong.

Code:

Public class conf{
    
    @ description(description ="anyText")
    Public boolean boo = false;
 
    Public Boolean bln = false;
    
    Public byte bytes = 0;
...

This is my annotation

Code:

package Configuration;

Public @interface Description {
    String description();
}

Any help will be appreciated. Thanks in advance.

**cyber-noob** · 28-02-2010

Hello,
Just because you do not specify retention for your endorsement, and by default is the source level is used. This means that your annotation appears only in the source code and not in the *. class, or at runtime via reflection.

Code:

@ Retention(RetentionPolicy.RUNTIME)
Public @interface Description {
    String description();
}

According to Java naming conventions, How the packages by a tiny classes and capitalized short the opposite of what you do and I advise you to adopt these conventions.

**Remedy** · 28-02-2010

Hello,
I tried what you have said, but it does not work for me, I have another question with me. It plays in the loop, but my code

Code:

Object [] obj = conf.getClass (). GetAnnotations ();
        System.out.println ("---:"obj.length +);

I think I need a alternative for this, please if you know any alternative for this then please post back. Thanks in advance.

**Gunner 1** · 28-02-2010

Hello,
Here is my test program, please check it

Code:

import Configuration.description;
...
Config01 con = new Config01();

Field[] fld = con.getClass().getDeclaredFields();
 
        for(int i =0; i <fld.length; i + +){
            try {
                Description desc = fld[i].getAnnotation(description.class);
                if(desc! = null){
                    System.out.System.out.println("!" Annotation "+ desc.Description());
                }
            } catch (IllegalArgumentException e) {
                e.printStackTrace();
            }
        }
...

**GlassFish** · 28-02-2010

Hello,
I think before you do the loop in your program

Code:

Field[] fld = conf.getClass().getDeclaredFields();

For using annotations you should do

Code:

Annotation[] g = conf.getClass().getAnnotations();

I think this may work, implement this in your code and see if it works. If you need any more help then do post back with the error or the exception you are getting so, it would be easy for us to understand your exact problem.