Spring and cross context: WebAsyncManager cannot be cast to WebAsyncManager

Question

I want to use the cross context feature in a Spring application so I can import some webapp1 JSP into a webapp2 JSP. I\'m using Eclipse STS with the included Tomcat 7.0.42 (

Answer 1

I came across this issue today and based on @Sylvain Lecoy's answer I came up with this implementation of a servlet filter that acts in the way the Atlassian filter javadoc describes. Putting it before any filter that calls WebAsyncUtils.getAsyncManager(ServletRequest) seems to fix any classloader/cross-context issues.

public class IgnoreWebAsyncManagerFilter implements Filter {

static class IgnoreWebAsyncManagerCacheServletRequest extends HttpServletRequestWrapper {

    /**
     * Creates a ServletRequest adaptor wrapping the given request object.
     *
     * @param request the {@link ServletRequest} to wrap.
     * @throws IllegalArgumentException if the request is null
     */
    IgnoreWebAsyncManagerCacheServletRequest(HttpServletRequest request) {
        super(request);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void setAttribute(String name, Object o) {
        if (!name.equals(WebAsyncUtils.WEB_ASYNC_MANAGER_ATTRIBUTE)) {
            super.setAttribute(name, o);
        }
    }
}


/**
 * {@inheritDoc}
 */
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}

/**
 * {@inheritDoc}
 */
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
    chain.doFilter(new IgnoreWebAsyncManagerCacheServletRequest((HttpServletRequest) request), response);
}

/**
 * {@inheritDoc}
 */
@Override
public void destroy() {
}

Note: This assumes all requests are HttpServletRequest instances but could be modified to be more safe.