[Laszlo-dev] Reentrant lock hell

[P T Withington]

I am getting this when I try to load any app from my trunk sandbox.   
I have never understood what causes this error or how to cure it.   
Any hints?

java.lang.NoClassDefFoundError: EDU/oswego/cs/dl/util/concurrent/ 
ReentrantLock
	org.openlaszlo.cache.Cache$Item.<init>(Cache.java:898)
	org.openlaszlo.cache.Cache.findItem(Cache.java:259)
	org.openlaszlo.cm.CompilationManager.getItem(CompilationManager.java: 
610)
	org.openlaszlo.cm.CompilationManager.getLastModified 
(CompilationManager.java:594)
	org.openlaszlo.servlets.responders.ResponderCompile.getLastModified 
(ResponderCompile.java:394)
	org.openlaszlo.servlets.responders.ResponderCompile.respondImpl 
(ResponderCompile.java:178)
	org.openlaszlo.servlets.responders.Responder.respond(Responder.java: 
260)
	org.openlaszlo.servlets.LZServlet._doGet(LZServlet.java:441)
	org.openlaszlo.servlets.LZServlet.doGet(LZServlet.java:355)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)