Java - Get reference to a static class using reflection

Question

In Java, is it possible to access an instance of a static class (nested) using reflection?

Supposing I have the following 2 classes defined in the package Package1.SubPackage.SubSubPackage:

public class MyMainClass {  
   public static class SalesObjectGrouper1 {  
      public static final GrouperContext CONTEXT = new GrouperContext("MyDate");  
   }  

   private static class SalesObjectGrouper2 {  
      public static final GrouperContext CONTEXT = new GrouperContext("MyDate");  
   }  
}

If I run the following code:

try {
     xyz = Class.forName( "Package1.SubPackage.SubSubPackage.MyMainClass.SalesObjectGrouper1" );
} catch( ClassNotFoundException ex ) {
     // always hit the error
}

it will error indicating class cannot be found. Can this be done?

btw using Class.forName() does not use reflection.

stacker
– stacker

2010-07-28 21:17:48 +00:00
Commented Jul 28, 2010 at 21:17 — stacker
– stacker, Commented Jul 28, 2010 at 21:17

Jim Garrison · Accepted Answer · 2010-07-28 21:06:54Z

19

Have you tried referring to the nested class as

MyMainClass$SalesObjectGrouper1

Nested classes are internally named ContainingClassName$NestedClassName

answered Jul 28, 2010 at 21:06

Jim Garrison

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Tom Hawtin - tackline · Accepted Answer · 2010-07-28 21:30:50Z

3

To avoid hacks in the mapping of Java language classes on to the Java runtime classes, you could use Class.getDeclaredClasses. Using reflection is often a mistake. Dealing with nested classes does not seem to be a good sign.

answered Jul 28, 2010 at 21:30

Tom Hawtin - tackline

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