I am building a Wicket web application which is going to have to handle a lot of simultaneous requests. I've setup a test environment and some jmeter scripts to do load testing and I notice I can reduce the CPU and memory footprint of my application if I make most pages Stateless.

I've added code to the onBeforeRender() method of the biggest page to show me which of the components are causing my page to be stateful. This is the code I have for detecting that:

@Override
protected void onBeforeRender() {    
    if (!getSession().isTemporary()) {
        visitChildren(Component.class, new IVisitor<Component>() {
            @Override
            public Object component(Component component) {
                String pageClassName = AbstractStatelessBasePage.this.getClass().getName();
                if (!component.isStateless()) {

                    String msg = pageClassName+" is stateful because of stateful component " + component.getClass().getName() + " with id " + component.getId() + ".";

                    List<IBehavior> behaviourList = component.getBehaviors();
                    for (IBehavior iBehavior : behaviourList) {
                        if (!iBehavior.getStatelessHint(component)) {
                            msg += "\n\t" + "The component has stateful behaviour: " + iBehavior.getClass().getName();
                        }
                    }
                    LOG.error(msg);
                }

                checkedPages.add(pageClassName);
                return CONTINUE_TRAVERSAL;
            }
        });
    }
}

In the output I see that the stateful behavior is caused by AjaxLinks used by some of the existing components in the pages:

ERROR - AbstractStatelessBasePage$1.component(45) | HomePage is stateful because of stateful component InfoGrid$InfoButton with id infoButton.
    The component has stateful behaviour: org.apache.wicket.ajax.markup.html.AjaxLink$1

                    
                    

                        
                        java
                        
                        wicket
                        
                        stateless
                        
                    

                    

                        
                        
                        
                        
                        
                        Edit
                        
                        
                        

                            
                        

                        
                        Report