java.lang.NoClassDefFoundError: com/wcs/wcslib/vaadin/widget/multifileuploa

I'm having issue using mulitfileupload addon.

I'm using Vaadin 7.6.1 and 1.9 version of MultiFileUpload Add on.

It is giving me the following error.

com.vaadin.server.ServiceException: java.lang.NoClassDefFoundError: com/wcs/wcslib/vaadin/widget/multifileupload/ui/UploadFinishedHandler
    at com.vaadin.server.VaadinService.handleExceptionDuringRequest(VaadinService.java:1464)
    at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1421)
    at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:364)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:821)
    at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
    at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
    at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:301)
    at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:27)
    at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
    at oracle.security.jps.ee.http.JpsAbsFilter$1.run(JpsAbsFilter.java:119)
    at oracle.security.jps.util.JpsSubject.doAsPrivileged(JpsSubject.java:324)
    at oracle.security.jps.ee.util.JpsPlatformUtil.runJaasMode(JpsPlatformUtil.java:460)
    at oracle.security.jps.ee.http.JpsAbsFilter.runJaasMode(JpsAbsFilter.java:103)
    at oracle.security.jps.ee.http.JpsAbsFilter.doFilter(JpsAbsFilter.java:171)
    at oracle.security.jps.ee.http.JpsFilter.doFilter(JpsFilter.java:71)
    at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
    at oracle.dms.servlet.DMSServletFilter.doFilter(DMSServletFilter.java:163)
    at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
    at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3730)
    at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3696)
    at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
    at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
    at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2273)
    at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2179)
    at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1490)
    at weblogic.work.ExecuteThread.execute(ExecuteThread.java:256)
    at weblogic.work.ExecuteThread.run(ExecuteThread.java:221)
Caused By: java.lang.NoClassDefFoundError: com/wcs/wcslib/vaadin/widget/multifileupload/ui/UploadFinishedHandler
    at java.lang.Class.getDeclaredConstructors0(Native Method)
    at java.lang.Class.privateGetDeclaredConstructors(Class.java:2389)
    at java.lang.Class.getConstructor0(Class.java:2699)
    at java.lang.Class.getConstructor(Class.java:1657)
    at com.vaadin.server.ServletPortletHelper.verifyUIClass(ServletPortletHelper.java:75)
    at com.vaadin.server.ServletPortletHelper.initDefaultUIProvider(ServletPortletHelper.java:156)
    at com.vaadin.server.VaadinService.createAndRegisterSession(VaadinService.java:773)
    at com.vaadin.server.VaadinService.doFindOrCreateVaadinSession(VaadinService.java:727)
    at com.vaadin.server.VaadinService.findOrCreateVaadinSession(VaadinService.java:668)
    at com.vaadin.server.VaadinService.findVaadinSession(VaadinService.java:527)
    at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1403)
    at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:364)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
    at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
    at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
    at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:301)
    at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
    at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
    at oracle.security.jps.ee.http.JpsAbsFilter$1.run(JpsAbsFilter.java:119)
    at oracle.security.jps.util.JpsSubject.doAsPrivileged(JpsSubject.java:324)

Have anyone faced this issue?

Hi Celvin, please post this question in the addon-discussion directly, as you are more likely to get help there.

Best
Bernd

I did post this as an issue in github. I thought this was the addon discussion forum.

Thank you for your help.

Well that was a version mismatch issue, I had to compile the addon with 1.6 JRE