[appengine-java] Re: ThreadLocal seems not to be working sometimes

[Jonathan Nash]

I am seeing this issue and my ThreadLocal is static and final.  I am using 
1.5.5.

public abstract class GaeApplication extends com.vaadin.Application 
implements
        HttpServletRequestListener {

....

    private static final ThreadLocal<GaeApplication> appReference = new 
ThreadLocal<GaeApplication>();
    private static GaeApplication gaep;

.....

    @Override
    public final void init() {
        setInstance(this); // So that we immediately have access to the 
current application
.....

    // @return the current application instance
    public static GaeApplication getInstance() {
        GaeApplication app = appReference.get();
        if (null == app) {
            LOGGER.warning("Null threadlocal");
            return gaep;
        }
        return appReference.get();
    }

    // Set the current application instance
    public static void setInstance(final GaeApplication application) {
        appReference.set(application);
        gaep = application;
    }

    @Override
    public void
            onRequestStart(final HttpServletRequest request, final 
HttpServletResponse response) {
        GaeApplication.setInstance(this);
    }

    @Override
    public void onRequestEnd(final HttpServletRequest request, final 
HttpServletResponse response) {
        appReference.remove();
    }

My hack around this is the static variable gaep which is returned whenever 
appReference.get() returns null. I am not able to boil it down to a simple 
example. It possibly has something to do with a class (not the application 
class) that calls GaeApplication.getInstance() being reconstituted from 
serialization and checking the hashcode but am not really sure and have no 
idea why that would impact ThreadLocal in any way.

Jonathan

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