Marshall Shi created SHINDIG-1893:
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Summary: 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
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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