Memory Leak ISSUE : "_desktop" variable of an org.zkoss.zk.ui.http.ExecutionImpl

asked 2014-01-13 18:45:22 +0800

HiralVadher
10 ● 2

updated 2014-01-15 04:28:49 +0800

jimmyshiau
4921 ● 5
http://www.zkoss.org/

Server's CPU usage goes up ,sometime upto 100%. and this issue is intermittent & not easy to reproduce

Following is the finding on this issue. any idea on the root cause of this issue ?

<quote> The main concern in the heap dump is one single large instance of org.zkoss.zk.ui.impl.DesktopImpl retaining ~2.75 gb alone. That is referenced and retained through the "_desktop" variable of an org.zkoss.zk.ui.http.ExecutionImpl that is held as a thread local in an ajp request thread.

It may be that the application did not properly clean up this thread local after prior requests or that a single request is generating that much overhead in this object. Most of the retention in the DesktopImpl comes down to its UiVisualizer. </quote>