https://bz.apache.org/bugzilla/show_bug.cgi?id=63209
--- Comment #5 from Judit Raj <prju...@gmail.com> --- I too face the same issue while saving a test plan. Log below: java.lang.NoClassDefFoundError: Could not initialize class org.apache.jmeter.gui.util.FileDialoger at org.apache.jmeter.gui.action.Save.computeFileName(Save.java:203) ~[ApacheJMeter_core.jar:5.1.1 r1855137] at org.apache.jmeter.gui.action.Save.doAction(Save.java:165) ~[ApacheJMeter_core.jar:5.1.1 r1855137] at org.apache.jmeter.gui.action.ActionRouter.performAction(ActionRouter.java:88) ~[ApacheJMeter_core.jar:5.1.1 r1855137] at org.apache.jmeter.gui.action.ActionRouter.doActionNow(ActionRouter.java:125) ~[ApacheJMeter_core.jar:5.1.1 r1855137] at org.apache.jmeter.gui.action.AbstractAction.popupShouldSave(AbstractAction.java:77) ~[ApacheJMeter_core.jar:5.1.1 r1855137] at org.apache.jmeter.gui.action.Start.doAction(Start.java:113) ~[ApacheJMeter_core.jar:5.1.1 r1855137] at org.apache.jmeter.gui.action.ActionRouter.performAction(ActionRouter.java:88) ~[ApacheJMeter_core.jar:5.1.1 r1855137] at org.apache.jmeter.gui.action.ActionRouter.lambda$actionPerformed$0(ActionRouter.java:70) ~[ApacheJMeter_core.jar:5.1.1 r1855137] at java.awt.event.InvocationEvent.dispatch(Unknown Source) ~[?:1.8.0_181] at java.awt.EventQueue.dispatchEventImpl(Unknown Source) ~[?:1.8.0_181] at java.awt.EventQueue.access$500(Unknown Source) ~[?:1.8.0_181] at java.awt.EventQueue$3.run(Unknown Source) ~[?:1.8.0_181] at java.awt.EventQueue$3.run(Unknown Source) ~[?:1.8.0_181] at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_181] at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source) ~[?:1.8.0_181] at java.awt.EventQueue.dispatchEvent(Unknown Source) ~[?:1.8.0_181] at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) [?:1.8.0_181] at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) [?:1.8.0_181] at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) [?:1.8.0_181] at java.awt.EventDispatchThread.pumpEvents(Unknown Source) [?:1.8.0_181] at java.awt.EventDispatchThread.pumpEvents(Unknown Source) [?:1.8.0_181] at java.awt.EventDispatchThread.run(Unknown Source) [?:1.8.0_181] 2019-06-28 15:23:51,505 ERROR o.a.j.JMeter: Uncaught exception: -- You are receiving this mail because: You are the assignee for the bug.