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  1. XWiki Platform
  2. XWIKI-18717

NPE in 'xpart.vm' when adding comments with CAPTCHA as guest user which causes errors in browser and prevents adding further comments

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Critical
    • Resolution: Fixed
    • Affects Version/s: 13.4
    • Fix Version/s: 12.10.11, 13.4.6, 13.10.2, 14.0-rc-1
    • Component/s: Flamingo Skin, Old Core
    • Labels:
      None
    • Environment:
      Windows 10 Pro 64 bit, Chrome 91, using a local instance of XWiki 13.4 (PostgreSQL 13/ Tomcat)
    • Difficulty:
      Unknown
    • Documentation:
      N/A
    • Documentation in Release Notes:
      N/A
    • Similar issues:

      Description

      STEPS TO REPRODUCE

      1. Login as Admin
      2. Go to Administer Wiki > Users & Rights > Rights
      3. Check 'Require unregistered users to solve a CAPTCHA when posting a comment on a page'
      4. Create a page
      5. On that page, go to Administer Page > Users & Rights > Rights: Page > Users
      6. Grant 'Comment' right to Unregistered users
      7. Logout
      8. Add some comments as a guest user by filling the CAPTCHA

      EXPECTED RESULTS

      The comments are added successfully without errors.

      ACTUAL RESULTS

      Sometimes, when adding one comment after another, some errors are displayed in browser and console which prevent adding further comments in all wiki pages:

      Error number 4001 in 4: Error while evaluating velocity template commentfield.vm

      with the following error in console:

      2021-06-04 12:48:44,413 [http-nio-8080-exec-7 - http://localhost:1113/bin/get/P1/?xpage=xpart&vm=commentfield.vm&number=&name=XWiki.XWikiComments_comment&content=hello3] ERROR c.x.x.XWiki                    - Error while evaluating velocity template [commentfield.vm]
      org.xwiki.rendering.RenderingException: Failed to execute renderer
              at org.xwiki.rendering.async.internal.DefaultAsyncRendererExecutor.syncRender(DefaultAsyncRendererExecutor.java:270)
              at org.xwiki.rendering.async.internal.DefaultAsyncRendererExecutor.render(DefaultAsyncRendererExecutor.java:250)
              at org.xwiki.rendering.async.internal.block.DefaultBlockAsyncRendererExecutor.render(DefaultBlockAsyncRendererExecutor.java:154)
              at com.xpn.xwiki.internal.template.InternalTemplateManager.render(InternalTemplateManager.java:772)
              at com.xpn.xwiki.internal.template.InternalTemplateManager.renderFromSkin(InternalTemplateManager.java:745)
              at com.xpn.xwiki.internal.template.InternalTemplateManager.renderFromSkin(InternalTemplateManager.java:725)
              at com.xpn.xwiki.internal.template.InternalTemplateManager.render(InternalTemplateManager.java:711)
              at com.xpn.xwiki.internal.template.DefaultTemplateManager.render(DefaultTemplateManager.java:78)
              at com.xpn.xwiki.XWiki.evaluateTemplate(XWiki.java:2515)
              at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:2493)
              at com.xpn.xwiki.api.XWiki.parseTemplate(XWiki.java:997)
              at jdk.internal.reflect.GeneratedMethodAccessor195.invoke(Unknown Source)
              at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
              at java.base/java.lang.reflect.Method.invoke(Method.java:566)
              at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke(UberspectImpl.java:571)
              at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:554)
              at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:221)
              at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:368)
              at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:492)
              at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:147)
              at org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroProxy.java:218)
              at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:331)
              at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:261)
              at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:304)
              at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:439)
              at org.apache.velocity.Template.merge(Template.java:358)
              at org.apache.velocity.Template.merge(Template.java:262)
              at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:280)
              at com.xpn.xwiki.render.DefaultVelocityManager.evaluate(DefaultVelocityManager.java:321)
              at com.xpn.xwiki.internal.template.VelocityTemplateEvaluator.evaluateContent(VelocityTemplateEvaluator.java:95)
              at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.evaluateContent(TemplateAsyncRenderer.java:217)
              at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.renderVelocity(TemplateAsyncRenderer.java:180)
              at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.render(TemplateAsyncRenderer.java:137)
              at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.render(TemplateAsyncRenderer.java:53)
              at org.xwiki.rendering.async.internal.DefaultAsyncRendererExecutor.lambda$syncRender$0(DefaultAsyncRendererExecutor.java:267)
              at com.xpn.xwiki.internal.security.authorization.DefaultAuthorExecutor.call(DefaultAuthorExecutor.java:98)
              at org.xwiki.rendering.async.internal.DefaultAsyncRendererExecutor.syncRender(DefaultAsyncRendererExecutor.java:267)
              at org.xwiki.rendering.async.internal.DefaultAsyncRendererExecutor.render(DefaultAsyncRendererExecutor.java:250)
              at org.xwiki.rendering.async.internal.block.DefaultBlockAsyncRendererExecutor.render(DefaultBlockAsyncRendererExecutor.java:154)
              at com.xpn.xwiki.internal.template.InternalTemplateManager.render(InternalTemplateManager.java:772)
              at com.xpn.xwiki.internal.template.InternalTemplateManager.renderFromSkin(InternalTemplateManager.java:745)
              at com.xpn.xwiki.internal.template.InternalTemplateManager.renderFromSkin(InternalTemplateManager.java:725)
              at com.xpn.xwiki.internal.template.InternalTemplateManager.render(InternalTemplateManager.java:711)
              at com.xpn.xwiki.internal.template.DefaultTemplateManager.render(DefaultTemplateManager.java:78)
              at com.xpn.xwiki.XWiki.evaluateTemplate(XWiki.java:2515)
              at com.xpn.xwiki.web.Utils.parseTemplate(Utils.java:179)
              at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:605)
              at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:286)
              at com.xpn.xwiki.web.LegacyActionServlet.service(LegacyActionServlet.java:104)
              at javax.servlet.http.HttpServlet.service(HttpServlet.java:733)
              at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
              at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
              at com.xpn.xwiki.web.ActionFilter.doFilter(ActionFilter.java:122)
              at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
              at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
              at org.xwiki.wysiwyg.filter.ConversionFilter.doFilter(ConversionFilter.java:109)
              at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
              at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
              at org.xwiki.container.servlet.filters.internal.SetHTTPHeaderFilter.doFilter(SetHTTPHeaderFilter.java:63)
              at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
              at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
              at org.xwiki.container.servlet.filters.internal.SavedRequestRestorerFilter.doFilter(SavedRequestRestorerFilter.java:208)
              at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
              at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
              at org.xwiki.container.servlet.filters.internal.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:111)
              at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
              at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
              at org.xwiki.resource.servlet.RoutingFilter.doFilter(RoutingFilter.java:132)
              at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
              at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
              at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:201)
              at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
              at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:544)
              at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143)
              at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
              at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:698)
              at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
              at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:364)
              at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:616)
              at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
              at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:831)
              at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1629)
              at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
              at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
              at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
              at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
              at java.base/java.lang.Thread.run(Thread.java:829)
      Caused by: org.xwiki.rendering.RenderingException: Failed to evaluate template with id [/skins/flamingo/commentfield.vm]
              at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.evaluateContent(TemplateAsyncRenderer.java:219)
              at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.renderVelocity(TemplateAsyncRenderer.java:180)
              at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.render(TemplateAsyncRenderer.java:137)
              at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.render(TemplateAsyncRenderer.java:53)
              at org.xwiki.rendering.async.internal.DefaultAsyncRendererExecutor.lambda$syncRender$0(DefaultAsyncRendererExecutor.java:267)
              at com.xpn.xwiki.internal.security.authorization.DefaultAuthorExecutor.call(DefaultAuthorExecutor.java:98)
              at org.xwiki.rendering.async.internal.DefaultAsyncRendererExecutor.syncRender(DefaultAsyncRendererExecutor.java:267)
              ... 86 common frames omitted
      Caused by: org.xwiki.velocity.XWikiVelocityException: Failed to evaluate content with namespace [/templates/xpart.vm]
              at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:288)
              at com.xpn.xwiki.render.DefaultVelocityManager.evaluate(DefaultVelocityManager.java:321)
              at com.xpn.xwiki.internal.template.VelocityTemplateEvaluator.evaluateContent(VelocityTemplateEvaluator.java:95)
              at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.evaluateContent(TemplateAsyncRenderer.java:217)
              ... 92 common frames omitted
      Caused by: org.apache.velocity.exception.MethodInvocationException: Invocation of method 'put' in  class com.xpn.xwiki.objects.classes.BaseClass threw exception java.lang.NullPointerException at /templates/xpart.vm[line 56, column 39]
              at org.apache.velocity.runtime.parser.node.ASTMethod.handleInvocationException(ASTMethod.java:308)
              at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:235)
              at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:368)
              at org.apache.velocity.runtime.parser.node.ASTReference.value(ASTReference.java:704)
              at org.apache.velocity.runtime.parser.node.ASTExpression.value(ASTExpression.java:75)
              at org.apache.velocity.runtime.parser.node.ASTSetDirective.render(ASTSetDirective.java:242)
              at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:439)
              at org.apache.velocity.Template.merge(Template.java:358)
              at org.apache.velocity.Template.merge(Template.java:262)
              at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:280)
              ... 95 common frames omitted
      Caused by: java.lang.NullPointerException: null
              at com.xpn.xwiki.objects.classes.BaseClass.addField(BaseClass.java:195)
              at com.xpn.xwiki.objects.BaseCollection.safeput(BaseCollection.java:265)
              at com.xpn.xwiki.objects.classes.BaseClass.put(BaseClass.java:249)
              at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
              at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
              at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
              at java.base/java.lang.reflect.Method.invoke(Method.java:566)
              at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke(UberspectImpl.java:571)
              at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:554)
              at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:221)
              ... 103 common frames omitted

      and

      Error number 4001 in 4: Error while evaluating velocity template commentsinline.vm

      with the following error in console:

      2021-06-04 12:24:40,323 [http-nio-8080-exec-5 - http://localhost:1113/bin/commentadd/PagC/WebHome?viewer=comments] ERROR o.a.v.d.null                   - Exception in macro #displayComment called at /templates/xpart.vm[line 144, column 1]
      2021-06-04 12:24:40,323 [http-nio-8080-exec-5 - http://localhost:1113/bin/commentadd/PagC/WebHome?viewer=comments] ERROR o.a.v.d.null                   - Exception in macro #displayThread called at /templates/xpart.vm[line 426, column 1]
      2021-06-04 12:24:40,325 [http-nio-8080-exec-5 - http://localhost:1113/bin/commentadd/PagC/WebHome?viewer=comments] ERROR c.x.x.XWiki                    - Error while evaluating velocity template [commentsinline.vm]
      org.xwiki.rendering.RenderingException: Failed to execute renderer
              at org.xwiki.rendering.async.internal.DefaultAsyncRendererExecutor.syncRender(DefaultAsyncRendererExecutor.java:270)
              at org.xwiki.rendering.async.internal.DefaultAsyncRendererExecutor.render(DefaultAsyncRendererExecutor.java:250)
              at org.xwiki.rendering.async.internal.block.DefaultBlockAsyncRendererExecutor.render(DefaultBlockAsyncRendererExecutor.java:154)
              at com.xpn.xwiki.internal.template.InternalTemplateManager.render(InternalTemplateManager.java:772)
              at com.xpn.xwiki.internal.template.InternalTemplateManager.renderFromSkin(InternalTemplateManager.java:745)
              at com.xpn.xwiki.internal.template.InternalTemplateManager.renderFromSkin(InternalTemplateManager.java:725)
              at com.xpn.xwiki.internal.template.InternalTemplateManager.render(InternalTemplateManager.java:711)
              at com.xpn.xwiki.internal.template.DefaultTemplateManager.render(DefaultTemplateManager.java:78)
              at com.xpn.xwiki.XWiki.evaluateTemplate(XWiki.java:2515)
              at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:2493)
              at com.xpn.xwiki.api.XWiki.parseTemplate(XWiki.java:997)
              at jdk.internal.reflect.GeneratedMethodAccessor216.invoke(Unknown Source)
              at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
              at java.base/java.lang.reflect.Method.invoke(Method.java:566)
              at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke(UberspectImpl.java:571)
              at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:554)
              at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:221)
              at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:368)
              at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:492)
              at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:147)
              at org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroProxy.java:218)
              at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:331)
              at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:261)
              at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:304)
              at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:439)
              at org.apache.velocity.Template.merge(Template.java:358)
              at org.apache.velocity.Template.merge(Template.java:262)
              at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:280)
              at com.xpn.xwiki.render.DefaultVelocityManager.evaluate(DefaultVelocityManager.java:321)
              at com.xpn.xwiki.internal.template.VelocityTemplateEvaluator.evaluateContent(VelocityTemplateEvaluator.java:95)
              at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.evaluateContent(TemplateAsyncRenderer.java:217)
              at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.renderVelocity(TemplateAsyncRenderer.java:180)
              at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.render(TemplateAsyncRenderer.java:137)
              at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.render(TemplateAsyncRenderer.java:53)
              at org.xwiki.rendering.async.internal.DefaultAsyncRendererExecutor.lambda$syncRender$0(DefaultAsyncRendererExecutor.java:267)
              at com.xpn.xwiki.internal.security.authorization.DefaultAuthorExecutor.call(DefaultAuthorExecutor.java:98)
              at org.xwiki.rendering.async.internal.DefaultAsyncRendererExecutor.syncRender(DefaultAsyncRendererExecutor.java:267)
              at org.xwiki.rendering.async.internal.DefaultAsyncRendererExecutor.render(DefaultAsyncRendererExecutor.java:250)
              at org.xwiki.rendering.async.internal.block.DefaultBlockAsyncRendererExecutor.render(DefaultBlockAsyncRendererExecutor.java:154)
              at com.xpn.xwiki.internal.template.InternalTemplateManager.render(InternalTemplateManager.java:772)
              at com.xpn.xwiki.internal.template.InternalTemplateManager.renderFromSkin(InternalTemplateManager.java:745)
              at com.xpn.xwiki.internal.template.InternalTemplateManager.renderFromSkin(InternalTemplateManager.java:725)
              at com.xpn.xwiki.internal.template.InternalTemplateManager.render(InternalTemplateManager.java:711)
              at com.xpn.xwiki.internal.template.DefaultTemplateManager.render(DefaultTemplateManager.java:78)
              at com.xpn.xwiki.XWiki.evaluateTemplate(XWiki.java:2515)
              at com.xpn.xwiki.web.Utils.parseTemplate(Utils.java:179)
              at com.xpn.xwiki.web.Utils.parseTemplate(Utils.java:88)
              at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:670)
              at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:286)
              at com.xpn.xwiki.web.LegacyActionServlet.service(LegacyActionServlet.java:104)
              at javax.servlet.http.HttpServlet.service(HttpServlet.java:733)
              at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
              at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
              at com.xpn.xwiki.web.ActionFilter.doFilter(ActionFilter.java:122)
              at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
              at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
              at org.xwiki.wysiwyg.filter.ConversionFilter.doFilter(ConversionFilter.java:109)
              at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
              at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
              at org.xwiki.container.servlet.filters.internal.SetHTTPHeaderFilter.doFilter(SetHTTPHeaderFilter.java:63)
              at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
              at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
              at org.xwiki.container.servlet.filters.internal.SavedRequestRestorerFilter.doFilter(SavedRequestRestorerFilter.java:208)
              at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
              at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
              at org.xwiki.container.servlet.filters.internal.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:111)
              at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
              at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
              at org.xwiki.resource.servlet.RoutingFilter.doFilter(RoutingFilter.java:132)
              at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
              at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
              at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:201)
              at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
              at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:544)
              at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143)
              at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
              at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:698)
              at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
              at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:364)
              at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:616)
              at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
              at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:831)
              at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1629)
              at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
              at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
              at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
              at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
              at java.base/java.lang.Thread.run(Thread.java:829)
      Caused by: org.xwiki.rendering.RenderingException: Failed to evaluate template with id [/skins/flamingo/commentsinline.vm]
              at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.evaluateContent(TemplateAsyncRenderer.java:219)
              at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.renderVelocity(TemplateAsyncRenderer.java:180)
              at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.render(TemplateAsyncRenderer.java:137)
              at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.render(TemplateAsyncRenderer.java:53)
              at org.xwiki.rendering.async.internal.DefaultAsyncRendererExecutor.lambda$syncRender$0(DefaultAsyncRendererExecutor.java:267)
              at com.xpn.xwiki.internal.security.authorization.DefaultAuthorExecutor.call(DefaultAuthorExecutor.java:98)
              at org.xwiki.rendering.async.internal.DefaultAsyncRendererExecutor.syncRender(DefaultAsyncRendererExecutor.java:267)
              ... 87 common frames omitted
      Caused by: org.xwiki.velocity.XWikiVelocityException: Failed to evaluate content with namespace [/templates/xpart.vm]
              at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:288)
              at com.xpn.xwiki.render.DefaultVelocityManager.evaluate(DefaultVelocityManager.java:321)
              at com.xpn.xwiki.internal.template.VelocityTemplateEvaluator.evaluateContent(VelocityTemplateEvaluator.java:95)
              at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.evaluateContent(TemplateAsyncRenderer.java:217)
              ... 93 common frames omitted
      Caused by: org.apache.velocity.exception.MethodInvocationException: Invocation of method 'resolveDocument' in  class org.xwiki.model.script.ModelScriptService threw exception java.lang.NullPointerException at /templates/xpart.vm[line 167, column 66]
              at org.apache.velocity.runtime.parser.node.ASTMethod.handleInvocationException(ASTMethod.java:308)
              at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:235)
              at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:368)
              at org.apache.velocity.runtime.parser.node.ASTReference.value(ASTReference.java:704)
              at org.apache.velocity.runtime.parser.node.ASTComparisonNode.evaluate(ASTComparisonNode.java:72)
              at org.apache.velocity.runtime.parser.node.ASTAndNode.evaluate(ASTAndNode.java:115)
              at org.apache.velocity.runtime.parser.node.ASTAndNode.value(ASTAndNode.java:80)
              at org.apache.velocity.runtime.parser.node.ASTExpression.value(ASTExpression.java:75)
              at org.apache.velocity.runtime.parser.node.ASTSetDirective.render(ASTSetDirective.java:242)
              at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:147)
              at org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroProxy.java:218)
              at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:331)
              at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:261)
              at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:304)
              at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:147)
              at org.apache.velocity.runtime.directive.Foreach.renderBlock(Foreach.java:309)
              at org.apache.velocity.runtime.directive.Foreach.render(Foreach.java:279)
              at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:304)
              at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:147)
              at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:171)
              at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:147)
              at org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroProxy.java:218)
              at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:331)
              at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:261)
              at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:304)
              at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:147)
              at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:171)
              at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:147)
              at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:439)
              at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:190)
              at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:439)
              at org.apache.velocity.Template.merge(Template.java:358)
              at org.apache.velocity.Template.merge(Template.java:262)
              at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:280)
              ... 96 common frames omitted
      Caused by: java.lang.NullPointerException: null
              at org.xwiki.model.reference.EntityReference.<init>(EntityReference.java:88)
              at org.xwiki.model.reference.AbstractLocalizedEntityReference.<init>(AbstractLocalizedEntityReference.java:113)
              at org.xwiki.model.reference.DocumentReference.<init>(DocumentReference.java:71)
              at org.xwiki.model.script.ModelScriptService.resolveDocument(ModelScriptService.java:457)
              at jdk.internal.reflect.GeneratedMethodAccessor329.invoke(Unknown Source)
              at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
              at java.base/java.lang.reflect.Method.invoke(Method.java:566)
              at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke(UberspectImpl.java:571)
              at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:554)
              at org.xwiki.velocity.introspection.MethodArgumentsUberspector$ConvertingVelMethod.invoke(MethodArgumentsUberspector.java:201)
              at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:221)
              ... 128 common frames omitted

      It is to be mentioned that the issue reproduces quite randomly and I didn't manage to reproduce it on XWiki 12.10.7 or 13.3.

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              Assignee:
              surli Simon Urli
              Reporter:
              iandriuta Ilie Andriuta
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                Updated:
                Resolved:
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