Uncaught Exception java.lang.NoClassDefFoundError: Could not initialize class org.apache.jmeter.gui.util.FileDialoger. See log file for details.
I installed apache-jmeter-5.1.1 and java 1.8.0_221 (8), and was walking through the getting started guide to build a web test plan in the GUI. But when I click save to save the Test Plan I receive the above error.
Full Output in debugger:
2019-07-24 15:30:13,306 ERROR o.a.j.JMeter: Uncaught exception: 
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.lambda$actionPerformed$0(ActionRouter.java:70) ~[ApacheJMeter_core.jar:5.1.1 r1855137]
    at java.awt.event.InvocationEvent.dispatch(Unknown Source) ~[?:1.8.0_221]
    at java.awt.EventQueue.dispatchEventImpl(Unknown Source) ~[?:1.8.0_221]
    at java.awt.EventQueue.access$500(Unknown Source) ~[?:1.8.0_221]
    at java.awt.EventQueue$3.run(Unknown Source) ~[?:1.8.0_221]
    at java.awt.EventQueue$3.run(Unknown Source) ~[?:1.8.0_221]
    at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_221]
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source) ~[?:1.8.0_221]
    at java.awt.EventQueue.dispatchEvent(Unknown Source) ~[?:1.8.0_221]
    at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) [?:1.8.0_221]
    at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) [?:1.8.0_221]
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) [?:1.8.0_221]
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source) [?:1.8.0_221]
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source) [?:1.8.0_221]
    at java.awt.EventDispatchThread.run(Unknown Source) [?:1.8.0_221]
Any idea how to resolve?
                Possible duplicate of java.lang.NoClassDefFoundError: Could not initialize class org.apache.jmeter.gui.util.MenuFactory
                    – matias elgart
                Jul 24 '19 at 19:39
                @matiaselgart Fresh install, I haven't been adding/changing any of the files in JMeter
                    – Andrew
                Jul 24 '19 at 19:41
                i would double, triple check your classpath as you're running JMeter. Seems like a missing or conflicting jar type of issue. Sorry can't be of more help.
                    – matias elgart
                Jul 25 '19 at 2:39
Open JMeter -> Options -> Look and Feel -> Select any other theme
other than Darcula. 
Restart JMeter, Create test plan and try to
save. 
Save should work.
        
If You saw the error as below, after selecting Open project  or Save project option
java.lang.ExceptionInInitializerError: null
at org.apache.jmeter.gui.action.Load.doActionAfterCheck(Load.java:76) ~[ApacheJMeter_core.jar:5.1 r1853635]
at org.apache.jmeter.gui.action.AbstractActionWithNoRunningTest.doAction(AbstractActionWithNoRunningTest.java:45) ~[ApacheJMeter_core.jar:5.1 r1853635]
at org.apache.jmeter.gui.action.ActionRouter.performAction(ActionRouter.java:88) ~[ApacheJMeter_core.jar:5.1 r1853635]
at org.apache.jmeter.gui.action.ActionRouter.lambda$actionPerformed$0(ActionRouter.java:70) ~[ApacheJMeter_core.jar:5.1 r1853635]
on Windows 10 with jmeter 5.0 or higher then the solution:
JMeter -> Options -> Look and Feel -> Select any other theme other than Darcula.
Restart JMeter
Open/Save option should work
is probably the best for You. 
                You just copy pasted the current answer and said it worked for you, which isn't a new answer. You should probably just give that answer a thumbs up rather than re-posting it. Or add a comment to that answer to say it worked for you in this other case as well.
                    – Andrew
                Nov 28 '19 at 14:15
        
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