Create Dynamic extension point in Eclipse plugins

private void createDynamicExtension(){
        
         try{
             Bundle bundle = plugin.getBundle();
             InputStream inputStream = bundle.getEntry("extention.xml").openStream();
      
             String bundleIdStr = ""+bundle.getBundleId();//Get bundle ID as a String
             IContributor contributor = new RegistryContributor(bundleIdStr, bundle.getSymbolicName(),
                        null, null);
             ExtensionRegistry extensionRegistry = (ExtensionRegistry) Platform.getExtensionRegistry();
             
             Field declaredField = ExtensionRegistry.class.getDeclaredField("masterToken");
                declaredField.setAccessible(true);
                Object masterToken = declaredField.get(extensionRegistry); 
                          
             boolean addContribution = extensionRegistry.addContribution(inputStream, contributor, false, bundle.getSymbolicName(), null, masterToken);
                                  

             System.out.println(addContribution);
             
             
         }catch(Exception ex){
             ex.printStackTrace();
         }
            
            
        }

Here I have provided the extension content inside the "extention.xml" file.