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java.lang.NoClassDefFoundError: 	at com.atlassian.core.util.thumbnail.Thumber.checkToolkit(Thumber.java:44)	at com.atlassian.jira.issue.thumbnail.DefaultThumbnailManager.checkToolkit(DefaultThumbnailManager.java:74)	at com.atlassian.jira.issue.thumbnail.DefaultThumbnailManager.getThumbnails(DefaultThumbnailManager.java:52)	at sun.reflect.GeneratedMethodAccessor429.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:324)	at com.atlassian.util.profiling.object.ObjectProfiler.profiledInvoke(ObjectProfiler.java:68)	at com.atlassian.jira.config.component.DelegatingInvocationHandler.invoke(DelegatingInvocationHandler.java:27)	at $Proxy3.getThumbnails(Unknown Source)	at com.atlassian.jira.web.action.issue.ViewIssue.getThumbnails(ViewIssue.java:665)	at sun.reflect.GeneratedMethodAccessor398.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:324)	at webwork.util.InjectionUtils$DefaultInjectionImpl.invoke(InjectionUtils.java:61)	at webwork.util.InjectionUtils.invoke(InjectionUtils.java:52)	at webwork.util.ValueStack.findValue(ValueStack.java:349)	at webwork.util.SimpleTest.test(SimpleTest.java:391)	at webwork.util.ValueStack.test(ValueStack.java:132)	at webwork.view.taglib.IfTag.doStartTag(IfTag.java:38)	at org.apache.jsp.view_attachments_jsp._jspService(view_attachments_jsp.java:296)	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:137)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:210)	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684)	at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:575)	at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:498)	at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:822)	at org.apache.jsp.viewissue_jsp._jspx_meth_webwork_if_2(viewissue_jsp.java:618)	at org.apache.jsp.viewissue_jsp._jspx_meth_webwork_property_5(viewissue_jsp.java:580)	at org.apache.jsp.viewissue_jsp._jspService(viewissue_jsp.java:171)	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:137)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:210)	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684)	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:432)	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:356)	at com.atlassian.jira.web.dispatcher.JiraServletDispatcher.service(JiraServletDispatcher.java:260)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684)	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:432)	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:356)	at com.atlassian.jira.servlet.QuickLinkServlet.service(QuickLinkServlet.java:58)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)	at com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:142)	at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:58)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)	at com.atlassian.seraph.filter.SecurityFilter.doFilter(SecurityFilter.java:168)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)	at com.atlassian.seraph.filter.LoginFilter.doFilter(LoginFilter.java:177)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)	at com.atlassian.util.profiling.filters.ProfilingFilter.doFilter(ProfilingFilter.java:132)	at com.atlassian.jira.web.filters.ProfilingAndErrorFilter.doFilter(ProfilingAndErrorFilter.java:25)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)	at com.atlassian.jira.web.filters.ActionCleanupDelayFilter.doFilter(ActionCleanupDelayFilter.java:37)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)	at com.atlassian.core.filters.AbstractEncodingFilter.doFilter(AbstractEncodingFilter.java:36)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:256)	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)	at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2417)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)	at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:171)	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)	at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:193)	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:781)	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:549)	at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:589)	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:666)	at java.lang.Thread.run(Thread.java:534)