Github user pulse00 commented on the pull request:
https://github.com/apache/wicket/pull/127#issuecomment-112330107
In our application, we setup the servlet context purely in java, without
any `web.xml`. This looks something like this:
```java
Constructor<? extends CustomWebApplication> constructor =
applicationClass.getConstructor(StageType.class);
CustomWebApplication CustomWebApplication =
constructor.newInstance(activeStateType);
CustomWebApplication.setApplicationContext(rootContext);
WicketFilter wicketFilter = new WicketFilter(CustomWebApplication) {
@Override
public void init(boolean isServlet, FilterConfig filterConfig) throws
ServletException {
setFilterPath("");
super.init(isServlet, filterConfig);
}
};
servletContext.addFilter("hstsFilter",
HSTSFilter.class).addMappingForUrlPatterns(EnumSet.allOf(DispatcherType.class),
false, "/*");
FilterRegistration.Dynamic wicketFilterRegistration =
servletContext.addFilter("wicketFilter", wicketFilter);
wicketFilterRegistration.addMappingForUrlPatterns(EnumSet.allOf(DispatcherType.class),
true, "/*");
```
Now if we want to add websocket support by adding using a
`WebsocketFilter`, we need to create a custom subclass because the constructor
with the `Webapplication` argument is not public in the subclasses of
`WicketFilter`:
```java
private class CustomWebsocketFilter extends Tomcat7WebSocketFilter {
private WebApplication application;
public CustomWebsocketFilter(WebApplication application) {
this.application = application;
}
@Override
protected IWebApplicationFactory getApplicationFactory() {
return new IWebApplicationFactory() {
@Override
public WebApplication createApplication(WicketFilter filter) {
return application;
}
@Override
public void destroy(WicketFilter filter) {
if (application != null)
{
try
{
ThreadContext.setApplication(application);
application.internalDestroy();
}
finally
{
ThreadContext.detach();
application = null;
}
}
}
};
}
}
```
At least that's how i understood the
[documentation](https://github.com/pulse00/wicket/blob/master/wicket-core/src/main/java/org/apache/wicket/protocol/http/WicketFilter.java#L109)
of this specific constructor.
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