i was install openjdk11 and openfire 4.4.0 or 4.3.2 have same error bellow.

How to resolve problem?

HTTP ERROR 500

Problem accessing /user-summary.jsp. Reason:

Server Error

Caused by:

java.lang.ClassCastException: class org.jivesoftware.util.cache.DefaultCache cannot be cast to class org.jivesoftware.openfire.plugin.util.cache.ClusteredCache (org.jivesoftware.util.cache.DefaultCache is in unnamed module of loader org.jivesoftware.openfire.starter.JiveClassLoader @15bbf42f; org.jivesoftware.openfire.plugin.util.cache.ClusteredCache is in unnamed module of loader org.jivesoftware.openfire.container.PluginClassLoader @461bdac) at org.jivesoftware.openfire.plugin.util.cache.ClusteredCacheFactory.getLock(ClusteredCacheFactory.java:502) at org.jivesoftware.util.cache.CacheFactory.getLock(CacheFactory.java:519) at org.jivesoftware.openfire.spi.RoutingTableImpl.getRoutes(RoutingTableImpl.java:863) at org.jivesoftware.openfire.SessionManager.getActiveSessionCount(SessionManager.java:1030) at org.jivesoftware.openfire.spi.PresenceManagerImpl.isAvailable(PresenceManagerImpl.java:95) at org.jivesoftware.openfire.admin.user_002dsummary_jsp._jspService(user_002dsummary_jsp.java:339) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:873) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1623) at com.opensymphony.sitemesh.webapp.SiteMeshFilter.obtainContent(SiteMeshFilter.java:129) at com.opensymphony.sitemesh.webapp.SiteMeshFilter.doFilter(SiteMeshFilter.java:77) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1610) at org.jivesoftware.util.LocaleFilter.doFilter(LocaleFilter.java:73) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1610) at org.jivesoftware.util.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:49) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1610) at org.jivesoftware.admin.PluginFilter.doFilter(PluginFilter.java:226) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1610) at org.jivesoftware.admin.AuthCheckFilter.doFilter(AuthCheckFilter.java:234) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1602) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:540) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:146) at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132) at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:257) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1700) at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1345) at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:480) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1667) at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1247) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144) at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:220) at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:152) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132) at org.eclipse.jetty.server.Server.handle(Server.java:505) at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:370) at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:267) at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:305) at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103) at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:117) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126) at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:698) at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:804) at java.base/java.lang.Thread.run(Thread.java:834)

Same here. Not only user-summary.jsp is failing, but also users can't login.

Attached stacktrace for the record. Openfire 4.3.2 is working fine, with the same hazelcast plugin version 2.4.2.