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  1. ZK
  2. ZK-3893

NPE with Websockets + include in defer mode

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      Steps to Reproduce

      run the example with websockets enabled in zk.xml

      <zk>
	<include id="incDefer" mode="defer" src="include1.zul"/>
	<button label="update include src (defer) => NPE"
			onClick='incDefer.setSrc("include2.zul")'/>
	<include id="incInstant" src="include1.zul"/>
	<button label="update include src (instant)"
			onClick='incInstant.setSrc("include2.zul")'/>
</zk>

      include1.zul

      <zk><div>Inc 1</div></zk>

      include2.zul

      <zk><div>Inc 2</div></zk>

      click the buttons

      Current Result

      updating the URL of an include in defer mode causes a NPE

      Failed to load /include2.zul

Cause: Unknown exception: java.lang.NullPointerException.
java.lang.NullPointerException
	at org.eclipse.jetty.server.Dispatcher.include(Dispatcher.java:99)
	at org.zkoss.web.servlet.Servlets.include(Servlets.java:975)
	at org.zkoss.zk.ui.http.ExecutionImpl.include(ExecutionImpl.java:204)
	at org.zkoss.zul.Include.include(Include.java:681)
	at org.zkoss.zul.Include.renderProperties(Include.java:628)
	at org.zkoss.zk.ui.AbstractComponent.redraw(AbstractComponent.java:2159)
...

      Expected Result

      working include

      Workaround

      avoid defer mode with includes
      OR
      use <apply templateURI="...">
      OR
      call Executions.createComponents(...) directly

            wenninghsu wenninghsu
            cor3000 cor3000
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              Created:
              Updated:
              Resolved: