Package com.atlassian.confluence.internal.web.filter.spring

Class IgnoreWebAsyncManagerFilter

java.lang.Object

com.atlassian.confluence.internal.web.filter.spring.IgnoreWebAsyncManagerFilter

All Implemented Interfaces:

javax.servlet.Filter

public class IgnoreWebAsyncManagerFilter
extends Object
implements javax.servlet.Filter

This filter exists to work around an issue with plugins that use SpringMVC.

Spring's OncePerRequestFilter calls WebAsyncUtils.getAsyncManager(ServletRequest) to get a WebAsyncManager to determine if the request is asynchronous. getAsyncManager caches the WebAsyncManager it creates as an attribute on the ServletRequest.

Since the host application and the plugin framework are using Spring classes from different ClassLoaders, that cached WebAsyncManager causes ClassCastExceptions for plugins which use SpringMVC.

To avoid those exceptions, this filter detects when Spring attempts to cache its WebAsyncManager and ignores the call, ensuring it's never added to the request. Each call to getAsyncManager(ServletRequest will just create a new one, which is then immediately thrown away. But that means the part of the request that is handled in the host application creates instances from its ClassLoader, and the part that is handled in the plugin framework creates instances from the OSGi ClassLoader.

Copied from com.atlassian.stash.internal.web.filters.IgnoreWebAsyncManagerFilter. Keep them in sync!

Since:

5.10

Constructor Summary

Constructors

Constructor	Description
IgnoreWebAsyncManagerFilter()

Method Summary

Modifier and Type	Method	Description
void	destroy()
void	doFilter(javax.servlet.ServletRequest servletRequest, javax.servlet.ServletResponse servletResponse, javax.servlet.FilterChain filterChain)
void	init(javax.servlet.FilterConfig filterConfig)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

IgnoreWebAsyncManagerFilter

public IgnoreWebAsyncManagerFilter()

Method Detail

destroy

public void destroy()

Specified by:

destroy in interface javax.servlet.Filter

doFilter

public void doFilter(javax.servlet.ServletRequest servletRequest,
                     javax.servlet.ServletResponse servletResponse,
                     javax.servlet.FilterChain filterChain)
              throws IOException,
                     javax.servlet.ServletException

Specified by:

doFilter in interface javax.servlet.Filter

Throws:

IOException

javax.servlet.ServletException

init

public void init(javax.servlet.FilterConfig filterConfig)
          throws javax.servlet.ServletException

Specified by:

init in interface javax.servlet.Filter

Throws:

javax.servlet.ServletException