swing - Java application insists on opening a class that doesn't exist? -

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my application has button, when clicked, opens jframe class (classb) display message. worked fine following code:

private void btnclickactionperformed(java.awt.event.actionevent evt) {     classb cb = new classb();     cb.setvisible(true); }

but decided away jframe class , display message on current jframe. problem when click on btnnext button, still tries open classb though code has been deleted and class has been deleted.

i have gone through every line of code , there no trace of classb existing. there's no reason application classb yet does.

why doing , can fix this?

here exception error comes in stack trace:

exception in thread "awt-eventqueue-0" java.lang.noclassdeffounderror: mypackage/classb     @ mypackage.mainframe.btnnextactionperformed(mainframe.java:6867)     @ mypackage.mainframe.access$200(mainframe.java:12)     @ mypackage.mainframe$3.actionperformed(mainframe.java:8383)     @ javax.swing.abstractbutton.fireactionperformed(abstractbutton.java:2022)     @ javax.swing.abstractbutton$handler.actionperformed(abstractbutton.java:2348)     @ javax.swing.defaultbuttonmodel.fireactionperformed(defaultbuttonmodel.java:402)     @ javax.swing.defaultbuttonmodel.setpressed(defaultbuttonmodel.java:259)     @ javax.swing.plaf.basic.basicbuttonlistener.mousereleased(basicbuttonlistener.java:252)     @ java.awt.component.processmouseevent(component.java:6535)     @ javax.swing.jcomponent.processmouseevent(jcomponent.java:3324)     @ java.awt.component.processevent(component.java:6300)     @ java.awt.container.processevent(container.java:2236)     @ java.awt.component.dispatcheventimpl(component.java:4891)     @ java.awt.container.dispatcheventimpl(container.java:2294)     @ java.awt.component.dispatchevent(component.java:4713)     @ java.awt.lightweightdispatcher.retargetmouseevent(container.java:4888)     @ java.awt.lightweightdispatcher.processmouseevent(container.java:4525)     @ java.awt.lightweightdispatcher.dispatchevent(container.java:4466)     @ java.awt.container.dispatcheventimpl(container.java:2280)     @ java.awt.window.dispatcheventimpl(window.java:2750)     @ java.awt.component.dispatchevent(component.java:4713)     @ java.awt.eventqueue.dispatcheventimpl(eventqueue.java:758)     @ java.awt.eventqueue.access$500(eventqueue.java:97)     @ java.awt.eventqueue$3.run(eventqueue.java:709)     @ java.awt.eventqueue$3.run(eventqueue.java:703)     @ java.security.accesscontroller.doprivileged(native method)     @ java.security.protectiondomain$javasecurityaccessimpl.dointersectionprivilege(protectiondomain.java:76)     @ java.security.protectiondomain$javasecurityaccessimpl.dointersectionprivilege(protectiondomain.java:86)     @ java.awt.eventqueue$4.run(eventqueue.java:731)     @ java.awt.eventqueue$4.run(eventqueue.java:729)     @ java.security.accesscontroller.doprivileged(native method)     @ java.security.protectiondomain$javasecurityaccessimpl.dointersectionprivilege(protectiondomain.java:76)     @ java.awt.eventqueue.dispatchevent(eventqueue.java:728)     @ java.awt.eventdispatchthread.pumponeeventforfilters(eventdispatchthread.java:201)     @ java.awt.eventdispatchthread.pumpeventsforfilter(eventdispatchthread.java:116)     @ java.awt.eventdispatchthread.pumpeventsforhierarchy(eventdispatchthread.java:105)     @ java.awt.eventdispatchthread.pumpevents(eventdispatchthread.java:101)     @ java.awt.eventdispatchthread.pumpevents(eventdispatchthread.java:93)     @ java.awt.eventdispatchthread.run(eventdispatchthread.java:82) caused by: java.lang.classnotfoundexception: mypackage.classb

bit of side note:

initially commented code open classb out , classb still opened when button clicked


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