Unable to register custom DLProcessor (dl.file.entry.processors) from a hook: causes NPE

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 6.1.30 EE GA3, 6.2.0 CE GA1, 6.2.1 CE GA2, 6.2.10 EE GA1
• Fix Version/s: 6.2.2 CE GA3 , 6.2.X EE, 7.0.0 M2
• Component/s: Core Infrastructure > Registry API, Portal Services, Portal Services > Component Management, Portal Services > Component Management > Hot Deployment
• Labels:
  • 6.1_release_notes
  • QA-TP
  • ee-ts
  • liferay-fixpack-document-management-12-6210
• Branch Version/s:
  6.2.x
• Backported to Branch:
  Committed
• Story Points: 9
• Fix Priority: 3
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/20706
• Bug Type: Regression Bug

1- Create a hook that registers a custom impl for PDFProcessor (https://github.com/lipusz/liferay-plugins/tree/LPS-49670-master)
2- Build & deploy (custom-pdfprocessor-hook-7.0.0.1.war)

Result:

13:51:50,240 INFO  [localhost-startStop-1][HotDeployImpl:217] Deploying custom-pdfprocessor-hook from queue
13:51:50,240 INFO  [localhost-startStop-1][PluginPackageUtil:1006] Reading plugin package for custom-pdfprocessor-hook
13:51:50,376 INFO  [localhost-startStop-1][HookHotDeployListener:541] Registering hook for custom-pdfprocessor-hook
14:22:10,666 ERROR [localhost-startStop-1][HotDeployImpl:231] com.liferay.portal.kernel.deploy.hot.HotDeployException: Error registering hook for custom-pdfprocessor-hook
com.liferay.portal.kernel.deploy.hot.HotDeployException: Error registering hook for custom-pdfprocessor-hook
	at com.liferay.portal.kernel.deploy.hot.BaseHotDeployListener.throwHotDeployException(BaseHotDeployListener.java:46)
	at com.liferay.portal.deploy.hot.HookHotDeployListener.invokeDeploy(HookHotDeployListener.java:281)
	at com.liferay.portal.deploy.hot.HotDeployImpl.doFireDeployEvent(HotDeployImpl.java:228)
	at com.liferay.portal.deploy.hot.HotDeployImpl.doFireDeployEvent(HotDeployImpl.java:254)
	at com.liferay.portal.deploy.hot.HotDeployImpl.fireDeployEvent(HotDeployImpl.java:97)
	at com.liferay.portal.kernel.deploy.hot.HotDeployUtil.fireDeployEvent(HotDeployUtil.java:28)
	at com.liferay.portal.kernel.servlet.PluginContextListener.fireDeployEvent(PluginContextListener.java:164)
	at com.liferay.portal.kernel.servlet.PluginContextListener.doPortalInit(PluginContextListener.java:154)
	at com.liferay.portal.kernel.util.BasePortalLifecycle.portalInit(BasePortalLifecycle.java:44)
	at com.liferay.portal.kernel.util.PortalLifecycleUtil.register(PortalLifecycleUtil.java:74)
	at com.liferay.portal.kernel.util.PortalLifecycleUtil.register(PortalLifecycleUtil.java:58)
	at com.liferay.portal.kernel.util.BasePortalLifecycle.registerPortalLifecycle(BasePortalLifecycle.java:54)
	at com.liferay.portal.kernel.servlet.PluginContextListener.contextInitialized(PluginContextListener.java:116)
	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4939)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5434)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:633)
	at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1113)
	at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1671)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
	at java.util.concurrent.ConcurrentHashMap.hash(ConcurrentHashMap.java:333)
	at java.util.concurrent.ConcurrentHashMap.put(ConcurrentHashMap.java:1125)
	at com.liferay.portlet.documentlibrary.util.DLProcessorRegistryImpl.register(DLProcessorRegistryImpl.java:166)
	at com.liferay.portlet.documentlibrary.util.DLProcessorRegistryUtil.register(DLProcessorRegistryUtil.java:70)
	at com.liferay.portal.deploy.hot.HookHotDeployListener$DLFileEntryProcessorContainer.registerDLProcessor(HookHotDeployListener.java:2560)
	at com.liferay.portal.deploy.hot.HookHotDeployListener.initPortalProperties(HookHotDeployListener.java:1518)
	at com.liferay.portal.deploy.hot.HookHotDeployListener.initPortalProperties(HookHotDeployListener.java:1376)
	at com.liferay.portal.deploy.hot.HookHotDeployListener.doInvokeDeploy(HookHotDeployListener.java:552)
	at com.liferay.portal.deploy.hot.HookHotDeployListener.invokeDeploy(HookHotDeployListener.java:278)
	... 24 more

== Notes for QA
The custom processor hook, more precisely, the CustomPDFProcessorImpl contains dummy impl methods only. It's not supposed to work, it's just for demonstrating that the portal cannot register a custom DL processor hook.