Deleting handler from pipeline - handler

Question

I am trying to delete a certain handler from my handler pipeline, but I am having trouble doing it. When I list the handlers in the pipeline before and after, the handler that I tried to remove is still there. So what am I doing wrong here? Here is a code snippet. All of this is in the startup phase. You can see that last thing that I do is configure the pipeline factory. I am using Netty 3.6.1.final.
List<String> handlers = new ArrayList<String>();
// list handlers in the pipeline
try {
handlers = this.pipelineFactory.getPipeline().getNames();
for (int len = handlers.size(), i = 0; i < len; i++) {
String s = handlers.get(i);
System.out.println("Item " + i + " is " + s);
}
} catch( Exception e ) {}
try {
System.out.println("Remove hexdump");
this.pipelineFactory.getPipeline().remove("hexdump");
} catch( Exception e ) {
System.out.println("error = " + e.getMessage());
}
try {
handlers = this.pipelineFactory.getPipeline().getNames();
for (int len = handlers.size(), i = 0; i < len; i++) {
String s = handlers.get(i);
System.out.println("Item " + i + " is " + s);
}
} catch( Exception e ) {}
// Configure the pipeline factory.
this.bootstrap.setPipelineFactory(this.pipelineFactory);
Here is the output:
Item 0 is framer
Item 1 is hexdump
Item 2 is handler
Remove hexdump
Item 0 is framer
Item 1 is hexdump
Item 2 is handler

Answer 1

Not sure without checking out full code, but looks like pipelineFactor.getPipeline() will always create a new pipeline in your case. Since its a factory, it will be creating the handlers each time. Put in one more sysout for this.pipelineFactory.getPipeline() and if you are seeing 3 different object hashcodes then this is the root cause.
Solution could be pipeline = this.pipelineFactory.getPipeline(), and then using the pipeline for adding removing etc.
Also for the record, it seems wrong usage anyway, you should be getting the pipeline from the ChannelHandlerContext object either in a decode method or a messageReceived method of a handler.