After migrating confluence to a new server, the image preview does not work.
The following appears in the atlassian-confluence.log
2018-08-29 16:16:31,111 ERROR [http-nio-8090-exec-12] [common.error.jersey.ThrowableExceptionMapper] toResponse Uncaught exception thrown by REST service: Could not initialize class com.atlassian.plugins.conversion.convert.image.ImagingConverter<br> -- referer: http://confluence.faceunity.com/pages/viewpage.action?pageId=10461557 | url: /rest/files/1.0/files/content/10461557/byAttachmentIds | traceId: 8a1618a3652716f1 | userName: admin<br>java.lang.NoClassDefFoundError: Could not initialize class com.atlassian.plugins.conversion.convert.image.ImagingConverter<br> at com.atlassian.confluence.plugins.conversion.impl.DefaultConversionManager.getConverters(DefaultConversionManager.java:156)<br> at com.atlassian.confluence.plugins.conversion.impl.DefaultConversionManager.isConvertible(DefaultConversionManager.java:134)<br> at sun.reflect.GeneratedMethodAccessor1725.invoke(Unknown Source)<br> at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)<br> at java.lang.reflect.Method.invoke(Method.java:498)<br> at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:302)<br> at org.eclipse.gemini.blueprint.service.importer.support.internal.aop.ServiceInvoker.doInvoke(ServiceInvoker.java:56)<br> at org.eclipse.gemini.blueprint.service.importer.support.internal.aop.ServiceInvoker.invoke(ServiceInvoker.java:60)<br> at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)<br> at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:133)<br> at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:121)<br> at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)<br> at org.eclipse.gemini.blueprint.service.util.internal.aop.ServiceTCCLInterceptor.invokeUnprivileged(ServiceTCCLInterceptor.java:70)<br> at org.eclipse.gemini.blueprint.service.util.internal.aop.ServiceTCCLInterceptor.invoke(ServiceTCCLInterceptor.java:53)<br> at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)<br> at org.eclipse.gemini.blueprint.service.importer.support.LocalBundleContextAdvice.invoke(LocalBundleContextAdvice.java:57)<br> at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)<br> at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:133)<br> at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:121)<br> at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)<br> at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:208)<br> at com.sun.proxy.$Proxy1833.isConvertible(Unknown Source)<br> at com.atlassian.confluence.plugins.files.manager.DefaultConfluenceFileManager.getPreviewMap(DefaultConfluenceFileManager.java:75)<br> at com.atlassian.confluence.plugins.files.services.ConfluenceFileServiceImpl.getPreviewMap(ConfluenceFileServiceImpl.java:116)<br> at com.atlassian.confluence.plugins.files.services.ConfluenceFileServiceImpl$1.apply(ConfluenceFileServiceImpl.java:59)<br> at com.atlassian.confluence.plugins.files.services.ConfluenceFileServiceImpl$1.apply(ConfluenceFileServiceImpl.java:46)<br> at com.google.common.collect.Lists$TransformingRandomAccessList$1.transform(Lists.java:617)<br> at com.google.common.collect.TransformedIterator.next(TransformedIterator.java:48)<br> at com.google.common.collect.ImmutableCollection$Builder.addAll(ImmutableCollection.java:281)<br> at com.google.common.collect.ImmutableCollection$ArrayBasedBuilder.addAll(ImmutableCollection.java:360)<br> at com.google.common.collect.ImmutableList$Builder.addAll(ImmutableList.java:665)<br> at com.atlassian.confluence.api.model.pagination.PageResponseImpl$Builder.addAll(PageResponseImpl.java:164)<br> at com.atlassian.confluence.api.model.pagination.PageResponseImpl.from(PageResponseImpl.java:80)<br> at com.atlassian.confluence.plugins.files.services.ConfluenceFileServiceImpl.getFilesByIds(ConfluenceFileServiceImpl.java:124)<br> at com.atlassian.confluence.plugins.files.rest.ConfluenceFileResource.getConfluenceFiles(ConfluenceFileResource.java:86)<br> at sun.reflect.GeneratedMethodAccessor1841.invoke(Unknown Source)<br> at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)<br> at java.lang.reflect.Method.invoke(Method.java:498)<br> at com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60)<br> at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$TypeOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:185)<br> at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)<br> at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:302)<br> at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)<br> at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)<br> at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)<br> at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)<br> at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1542)<br> at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1473)<br> at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1419)<br> at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1409)<br> at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:409)<br> at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:558)<br> at com.atlassian.plugins.rest.module.RestDelegatingServletFilter$JerseyOsgiServletContainer.doFilter(RestDelegatingServletFilter.java:159)<br> at com.sun.jersey.spi.container.servlet.ServletContainer.doFilter(ServletContainer.java:829)<br> at com.atlassian.plugins.rest.module.RestDelegatingServletFilter.doFilter(RestDelegatingServletFilter.java:69)<br> at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:64)<br> at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37)<br> at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:70)<br> at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:58)<br> at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:64)<br> at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37)<br> at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter$1.doFilter(DelegatingPluginFilter.java:58)<br> at com.atlassian.plugins.rest.module.servlet.RestServletUtilsUpdaterFilter.doFilterInternal(RestServletUtilsUpdaterFilter.java:22)<br> at com.atlassian.plugins.rest.module.servlet.RestServletUtilsUpdaterFilter.doFilter(RestServletUtilsUpdaterFilter.java:34)<br> at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:64)<br> at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37)<br> at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter$1.doFilter(DelegatingPluginFilter.java:58)<br> at com.atlassian.applinks.core.rest.context.ContextFilter.doFilter(ContextFilter.java:24)<br> at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:64)<br> at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37)<br> at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter$1.doFilter(DelegatingPluginFilter.java:58)<br> at com.atlassian.applinks.core.rest.context.ContextFilter.doFilter(ContextFilter.java:24)<br> at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:64)<br> at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37)<br> at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter$1.doFilter(DelegatingPluginFilter.java:58)<br> at com.atlassian.applinks.core.rest.context.ContextFilter.doFilter(ContextFilter.java:24)<br> at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:64)<br> at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37)<br> at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter$1.doFilter(DelegatingPluginFilter.java:58)<br> at com.atlassian.applinks.core.rest.context.ContextFilter.doFilter(ContextFilter.java:24)<br> at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:64)<br> at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37)<br> at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter$1.doFilter(DelegatingPluginFilter.java:58)<br> at com.atlassian.applinks.core.rest.context.ContextFilter.doFilter(ContextFilter.java:24)<br> at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:64)<br> at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37)<br> at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter$1.doFilter(DelegatingPluginFilter.java:58)<br> at com.comalatech.confluence.workflow.filters.FilePreviewFilter.doFilter(FilePreviewFilter.java:44)<br> at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:64)<br> at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37)<br> at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter$1.doFilter(DelegatingPluginFilter.java:58)<br> at com.atlassian.analytics.client.filter.UniversalAnalyticsFilter.doFilter(UniversalAnalyticsFilter.java:92)<br> at com.atlassian.analytics.client.filter.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:39)<br> at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:64)<br> at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37)<br> at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter$1.doFilter(DelegatingPluginFilter.java:58)<br> at com.atlassian.mywork.client.filter.ServingRequestsFilter.doFilter(ServingRequestsFilter.java:37)<br> at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:64)<br> at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37)<br> at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter$1.doFilter(DelegatingPluginFilter.java:58)<br> at com.atlassian.confluence.efi.OnboardingFilter.doFilter(OnboardingFilter.java:61)<br> at com.atlassian.core.filters.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:31)<br> at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:64)<br> at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37)<br> at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter$1.doFilter(DelegatingPluginFilter.java:58)<br> at com.atlassian.prettyurls.filter.PrettyUrlsSiteMeshFixupFilter.doFilter(PrettyUrlsSiteMeshFixupFilter.java:36)<br> at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:64)<br> at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37)<br> at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter$1.doFilter(DelegatingPluginFilter.java:58)<br> at com.atlassian.prettyurls.filter.PrettyUrlsDispatcherFilter.doFilter(PrettyUrlsDispatcherFilter.java:60)<br> at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:64)<br> at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37)<br> at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter$1.doFilter(DelegatingPluginFilter.java:58)<br> at com.atlassian.prettyurls.filter.PrettyUrlsSiteMeshFilter.doFilter(PrettyUrlsSiteMeshFilter.java:92)<br> at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:64)<br> at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37)<br> at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter$1.doFilter(DelegatingPluginFilter.java:58)<br> at com.atlassian.prettyurls.filter.PrettyUrlsMatcherFilter.doFilter(PrettyUrlsMatcherFilter.java:56)<br> at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:64)<br> at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37)<br> at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter$1.doFilter(DelegatingPluginFilter.java:58)<br> at com.atlassian.confluence.plugins.mobile.filter.MobileAppWebViewFilter.doFilter(MobileAppWebViewFilter.java:52)<br> at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:64)<br> at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37)<br> at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:70)<br> at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:58)<br> at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)<br> at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)<br> at com.opensymphony.sitemesh.webapp.SiteMeshFilter.doFilter(SiteMeshFilter.java:65)<br> at com.atlassian.confluence.util.profiling.ProfilingSiteMeshFilter.doFilter(ProfilingSiteMeshFilter.java:50)<br> at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)<br> at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)<br> at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:39)<br> at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter$1.doFilter(DelegatingPluginFilter.java:58)<br> at com.atlassian.confluence.util.profiling.ConfluenceActivityFilter.doFilter(ConfluenceActivityFilter.java:39)<br> at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:64)<br> at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37)<br> at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter$1.doFilter(DelegatingPluginFilter.java:58)<br> at com.atlassian.prettyurls.filter.PrettyUrlsCombinedMatchDispatcherFilter.doFilter(PrettyUrlsCombinedMatchDispatcherFilter.java:61)<br> at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:64)<br> at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37)<br> at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:70)<br> at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:58)<br> at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)<br> at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)<br><br>
