at com.cuso.Mao.doGet(Mao.java:97) at org.apache.sling.api.servlets.SlingSafeMethodsServlet.mayService(SlingSafeMethodsServlet.java:268) at org.apache.sling.api.servlets.SlingSafeMethodsServlet.service(SlingSafeMethodsServlet.java:344) at org.apache.sling.api.servlets.SlingSafeMethodsServlet.service(SlingSafeMethodsServlet.java:375) at org.apache.sling.engine.impl.request.RequestData.service(RequestData.java:508) at org.apache.sling.engine.impl.filter.SlingComponentFilterChain.render(SlingComponentFilterChain.java:45) at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:64) at com.day.cq.wcm.core.impl.WCMDebugFilter.doFilter(WCMDebugFilter.java:146) at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:60) at com.day.cq.wcm.core.impl.WCMComponentFilter.filterRootInclude(WCMComponentFilter.java:356) at com.day.cq.wcm.core.impl.WCMComponentFilter.doFilter(WCMComponentFilter.java:168) at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:60) at com.day.cq.personalization.impl.TargetComponentFilter.doFilter(TargetComponentFilter.java:96) at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:60) at org.apache.sling.engine.impl.SlingRequestProcessorImpl.processComponent(SlingRequestProcessorImpl.java:254)
line 97 is just calling the WorkflowSession wf = workflowServiceObject.getWorkflowSession(jcrsessionObject); Should I use JACKRABBIT SESSION instead of jcrSession? Which one is right?
I was facing a similar situation.There is nothing wrong with the model node that you are passing.
Getting new workflowSession from workflowService was giving nullpointer so I had to get the workflowService inside my Activator using the getServiceReference way and have it assigned to a static variable in a utility class.Still I got: and following was getting logged:-
Cannot read workflow model from node: /etc/workflow/models/deletecontent/jcr:content/model
And there was one more "session already closed" issue. For that I again made the resolverFactory a part of my utility class using which I could get administrativeResourceResolver in my servlet.
来源：https://stackoverflow.com/questions/43410809/cq-5-6-1-getworkflowsession-cause-uncaught-throwable-java-lang-nullpointerexcept