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http://jira.xwiki.org/jira/browse/XWIKI-1894?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Vincent Massol updated XWIKI-1894:
----------------------------------
Fix Version/s: 1.2 RC1
Assignee: Vincent Massol
> Exception in URL Factory initialization
> ---------------------------------------
>
> Key: XWIKI-1894
> URL: http://jira.xwiki.org/jira/browse/XWIKI-1894
> Project: XWiki Platform
> Issue Type: Bug
> Components: Actions and URLs
> Affects Versions: 1.2 M2
> Reporter: Vincent Massol
> Assigned To: Vincent Massol
> Priority: Minor
> Fix For: 1.2 RC1
>
>
> When multiple thread are calling the xwiki URL factory service creation it's
> possible that one thread will throw a NPE:
> {noformat}
> java.lang.NullPointerException
> at
> com.xpn.xwiki.web.XWikiURLFactoryServiceImpl.createURLFactory(XWikiURLFactoryServiceImpl.java:81)
> at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:108)
> at
> org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)
> at
> org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
> at
> org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
> at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
> {noformat}
> The reason is because the code does the following check:
> {code}
> public XWikiURLFactoryService getURLFactoryService()
> {
> if (urlFactoryService == null) {
> synchronized (URLFACTORY_SERVICE_LOCK) {
> if (urlFactoryService == null) {
> {code}
> but later the init is done is 2 steps: the creation of the object and its
> initilization:
> {code}
> urlFactoryService =
> (XWikiURLFactoryService)
> Class.forName(urlFactoryServiceClass).newInstance();
> urlFactoryService.init(this);
> code}
> Thus it's possible that urlFactoryService isn't null but still isn't
> initialized.
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