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https://issues.apache.org/jira/browse/SHINDIG-1893?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13651644#comment-13651644
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Abhinav Singhvi commented on SHINDIG-1893:
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I have also faced the same issue.
> Null pointer exception in gadget template processing
> ----------------------------------------------------
>
> Key: SHINDIG-1893
> URL: https://issues.apache.org/jira/browse/SHINDIG-1893
> Project: Shindig
> Issue Type: Bug
> Components: Java
> Affects Versions: 2.5.0-beta5
> Reporter: Marshall Shi
> Attachments: template.patch
>
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> During our gadget development, several gadgets are referring to the same
> gadget template. The rendering of those gadgets is problematic sometimes.
> When the problem occur, the Java stack trace look like this:
> Stack Dump = java.lang.NullPointerException
> at org.apache.xerces.dom.ParentNode.nodeListItem(Unknown Source)
> at org.apache.xerces.dom.ParentNode.item(Unknown Source)
> at
> org.apache.shindig.gadgets.templates.DefaultTemplateProcessor.processChildNodes(DefaultTemplateProcessor.java:134)
>
> at
> org.apache.shindig.gadgets.templates.tags.TemplateBasedTagHandler.processTemplate(TemplateBasedTagHandler.java:68)
>
> at
> org.apache.shindig.gadgets.templates.tags.TemplateBasedTagHandler.process(TemplateBasedTagHandler.java:58)
>
> at
> org.apache.shindig.gadgets.templates.XmlTemplateLibrary$LibraryTagHandler.process(XmlTemplateLibrary.java:305)
>
> at
> org.apache.shindig.gadgets.templates.DefaultTemplateProcessor.processElementInner(DefaultTemplateProcessor.java:341)
>
> at
> org.apache.shindig.gadgets.templates.DefaultTemplateProcessor.processElement(DefaultTemplateProcessor.java:246)
>
> at
> org.apache.shindig.gadgets.templates.DefaultTemplateProcessor.processNode(DefaultTemplateProcessor.java:154)
>
> at
> org.apache.shindig.gadgets.templates.DefaultTemplateProcessor.processChildNodes(DefaultTemplateProcessor.java:134)
>
> at
> org.apache.shindig.gadgets.templates.DefaultTemplateProcessor.processTemplate(DefaultTemplateProcessor.java:126)
>
> at
> org.apache.shindig.gadgets.rewrite.TemplateRewriter.executeTemplates(TemplateRewriter.java:357)
>
> at
> org.apache.shindig.gadgets.rewrite.TemplateRewriter.rewriteImpl(TemplateRewriter.java:177)
>
> at
> org.apache.shindig.gadgets.rewrite.TemplateRewriter.rewrite(TemplateRewriter.java:129)
>
> at
> org.apache.shindig.gadgets.render.HtmlRenderer.render(HtmlRenderer.java:88)
> at
> org.apache.shindig.gadgets.render.Renderer.render(Renderer.java:101)
> at
> org.apache.shindig.gadgets.servlet.GadgetRenderingServlet.render(GadgetRenderingServlet.java:112)
>
> at
> org.apache.shindig.gadgets.servlet.GadgetRenderingServlet.doGet(GadgetRenderingServlet.java:90)
>
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:575)
> It should be a concurrent issue of xerces API when parsing the template.
> Proposed fix is to add synchronized to the key XML element.
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