NPE when upload a file through WebDAV under workflow with sync deployed

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 6.2.X EE
• Fix Version/s: 6.2.X EE, 7.0.0 DXP FP11, 7.0.0 DXP SP2, 7.0.3 CE GA4, Master
• Component/s: Documents & Media, Sync Connector, WebDAV access, Workflow
• Labels:
  • fw_test_needed
  • liferay-digital-enterprise-70-sp2
  • liferay-fixpack-de-11-7010
• Branch Version/s:
  7.0.x, 6.2.x
• Backported to Branch:
  Committed
• Story Points: 1
• Fix Priority: 4
• Git Pull Request: https://github.com/mikemanyoung/liferay-portal/pull/443

Steps to reproduce:

1. Deploy sync-web and kaleo-web.
2. Edit Documents and Media > Home to use Single Approver.
3. Copy a file through WebDAV.

Actual results:
The errors appear:

03:50:24,668 ERROR [liferay/document_library_sync_event_processor-1][SerialDestination:70] Unable to process message {destinationName=liferay/document_library_sync_event_processor, response=null, responseDestinationName=null, responseId=null, payload=null, values={defaultLocale=en_US, groupId=0, permissionChecker=com.liferay.portal.kernel.util.TransientValue@6ce96c52, principalName=20199, event=update, modifiedTime=1482292224656, companyId=20155, type=file, typePK=20538}}
com.liferay.portal.kernel.messaging.MessageListenerException: java.lang.NullPointerException
	at com.liferay.portal.kernel.messaging.BaseMessageListener.receive(BaseMessageListener.java:32)
	at com.liferay.portal.kernel.messaging.InvokerMessageListener.receive(InvokerMessageListener.java:72)
	at com.liferay.portal.kernel.messaging.SerialDestination$1.run(SerialDestination.java:67)
	at com.liferay.portal.kernel.concurrent.ThreadPoolExecutor$WorkerTask._runTask(ThreadPoolExecutor.java:682)
	at com.liferay.portal.kernel.concurrent.ThreadPoolExecutor$WorkerTask.run(ThreadPoolExecutor.java:593)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
	at com.liferay.sync.service.impl.SyncDLObjectLocalServiceImpl.addSyncDLObject(SyncDLObjectLocalServiceImpl.java:115)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at com.liferay.portal.spring.aop.ServiceBeanMethodInvocation.proceed(ServiceBeanMethodInvocation.java:115)
	at com.liferay.portal.spring.transaction.DefaultTransactionExecutor.execute(DefaultTransactionExecutor.java:62)
	at com.liferay.portal.spring.transaction.TransactionInterceptor.invoke(TransactionInterceptor.java:51)
	at com.liferay.portal.spring.aop.ServiceBeanMethodInvocation.proceed(ServiceBeanMethodInvocation.java:111)
	at com.liferay.portal.spring.aop.ServiceBeanAopProxy.invoke(ServiceBeanAopProxy.java:175)
	at com.sun.proxy.$Proxy422.addSyncDLObject(Unknown Source)
	at com.liferay.sync.service.SyncDLObjectLocalServiceUtil.addSyncDLObject(SyncDLObjectLocalServiceUtil.java:320)
	at com.liferay.sync.util.SyncUtil.addSyncDLObject(SyncUtil.java:121)
	at com.liferay.sync.messaging.DLSyncEventMessageListener.processDLSyncEvent(DLSyncEventMessageListener.java:128)
	at com.liferay.sync.messaging.DLSyncEventMessageListener.doReceive(DLSyncEventMessageListener.java:78)
	at com.liferay.portal.kernel.messaging.BaseMessageListener.receive(BaseMessageListener.java:26)
	... 5 more
03:50:24,762 ERROR [liferay/document_library_sync_event_processor-1][SerialDestination:70] Unable to process message {destinationName=liferay/document_library_sync_event_processor, response=null, responseDestinationName=null, responseId=null, payload=null, values={defaultLocale=en_US, groupId=0, permissionChecker=com.liferay.portal.kernel.util.TransientValue@12bb35a8, principalName=20199, event=update, modifiedTime=1482292224747, companyId=20155, type=file, typePK=20538}}
com.liferay.portal.kernel.messaging.MessageListenerException: java.lang.NullPointerException
	at com.liferay.portal.kernel.messaging.BaseMessageListener.receive(BaseMessageListener.java:32)
	at com.liferay.portal.kernel.messaging.InvokerMessageListener.receive(InvokerMessageListener.java:72)
	at com.liferay.portal.kernel.messaging.SerialDestination$1.run(SerialDestination.java:67)
	at com.liferay.portal.kernel.concurrent.ThreadPoolExecutor$WorkerTask._runTask(ThreadPoolExecutor.java:682)
	at com.liferay.portal.kernel.concurrent.ThreadPoolExecutor$WorkerTask.run(ThreadPoolExecutor.java:593)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
	at com.liferay.sync.service.impl.SyncDLObjectLocalServiceImpl.addSyncDLObject(SyncDLObjectLocalServiceImpl.java:115)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at com.liferay.portal.spring.aop.ServiceBeanMethodInvocation.proceed(ServiceBeanMethodInvocation.java:115)
	at com.liferay.portal.spring.transaction.DefaultTransactionExecutor.execute(DefaultTransactionExecutor.java:62)
	at com.liferay.portal.spring.transaction.TransactionInterceptor.invoke(TransactionInterceptor.java:51)
	at com.liferay.portal.spring.aop.ServiceBeanMethodInvocation.proceed(ServiceBeanMethodInvocation.java:111)
	at com.liferay.portal.spring.aop.ServiceBeanAopProxy.invoke(ServiceBeanAopProxy.java:175)
	at com.sun.proxy.$Proxy422.addSyncDLObject(Unknown Source)
	at com.liferay.sync.service.SyncDLObjectLocalServiceUtil.addSyncDLObject(SyncDLObjectLocalServiceUtil.java:320)
	at com.liferay.sync.util.SyncUtil.addSyncDLObject(SyncUtil.java:121)
	at com.liferay.sync.messaging.DLSyncEventMessageListener.processDLSyncEvent(DLSyncEventMessageListener.java:128)
	at com.liferay.sync.messaging.DLSyncEventMessageListener.doReceive(DLSyncEventMessageListener.java:78)
	at com.liferay.portal.kernel.messaging.BaseMessageListener.receive(BaseMessageListener.java:26)
	... 5 more

Expected results:
No errors.