We are facing frequent Thread blocks for below thread in ZK framework. Below is the full trace of thread block.

ava.lang.Thread.State: RUNNABLE
at org.zkoss.util.MultiCache.get(MultiCache.java:82)

• locked <0x00000005e80938c8> (a org.zkoss.util.CacheMap)
  at org.zkoss.zk.ui.sys.ComponentsCtrl.getEventMethod(ComponentsCtrl.java:362)
  at org.zkoss.zk.ui.event.Events.isListened(Events.java:270)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild0(UiEngineImpl.java:750)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:686)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:630)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate(UiEngineImpl.java:597)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild0(UiEngineImpl.java:731)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:686)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:630)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate(UiEngineImpl.java:597)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild0(UiEngineImpl.java:731)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:686)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:630)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate(UiEngineImpl.java:597)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild0(UiEngineImpl.java:731)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:686)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:630)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate(UiEngineImpl.java:597)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild0(UiEngineImpl.java:731)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:686)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:630)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate(UiEngineImpl.java:597)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild0(UiEngineImpl.java:731)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:686)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:630)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate(UiEngineImpl.java:597)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild0(UiEngineImpl.java:731)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:686)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:630)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate(UiEngineImpl.java:597)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild0(UiEngineImpl.java:731)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:686)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:630)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate(UiEngineImpl.java:597)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild0(UiEngineImpl.java:731)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:686)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:630)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate(UiEngineImpl.java:597)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild0(UiEngineImpl.java:731)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:686)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:630)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate(UiEngineImpl.java:597)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild0(UiEngineImpl.java:731)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:686)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:630)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:662)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:630)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate(UiEngineImpl.java:597)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage0(UiEngineImpl.java:383)
  at org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage(UiEngineImpl.java:306)
  at org.zkoss.zk.ui.http.DHtmlLayoutServlet.process(DHtmlLayoutServlet.java:225)
  at org.zkoss.zk.ui.http.DHtmlLayoutServlet.doGet(DHtmlLayoutServlet.java:146)
  at com.tcs.sgv.zk.controller.BaseDHtmlLayoutServlet.doGet(BaseDHtmlLayoutServlet.java:111)
  at javax.servlet.http.HttpServlet.service(HttpServlet.java:734)
  at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
  at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:295)
  at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
  at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:378)
  at org.springframework.security.providers.anonymous.AnonymousProcessingFilter.doFilterHttp(AnonymousProcessingFilter.java:105)
  at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
  at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)
  at com.tcs.sgv.acl.security.filter.ClickjackFilter.doFilter(ClickjackFilter.java:30)
  at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)
  at org.springframework.security.util.FilterChainProxy.doFilter(FilterChainProxy.java:175)
  at org.springframework.security.util.FilterToBeanProxy.doFilter(FilterToBeanProxy.java:99)
  at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246)
  at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
  at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:231)
  at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:149)
  at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:420)
  at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:169)
  at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:150)
  at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:97)
  at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:559)
  at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:102)
  at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:344)
  at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:854)
  at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:653)
  at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:926)
  at java.lang.Thread.run(Thread.java:745)
  Locked ownable synchronizers:
• None