Friday, September 3, 2021

Blank screen displayed in edit mode | Adobe Experience Manager(AEM)

Blank screen displayed in edit mode | Adobe Experience Manager(AEM)


I was getting the blank screen while accessing the pages through Edit mode in AEM


The below exception was displayed

java.lang.NullPointerException
at org.apache.jsp.libs.cq.gui.components.authoring.workflow.startworkflow.startworkflow_jsp._jspService(startworkflow_jsp.java:217)
at org.apache.sling.scripting.jsp.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
at org.apache.sling.scripting.jsp.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:502)
at org.apache.sling.scripting.jsp.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:449)
at org.apache.sling.scripting.jsp.JspScriptEngineFactory.callJsp(JspScriptEngineFactory.java:339)
at org.apache.sling.scripting.jsp.JspScriptEngineFactory.access$100(JspScriptEngineFactory.java:97)
at org.apache.sling.scripting.jsp.JspScriptEngineFactory$JspScriptEngine.eval(JspScriptEngineFactory.java:600)
Also, the workflow model page was blank with the below exception



java.lang.NullPointerException
at org.apache.jsp.libs.cq.workflow.admin.console.components.datasource.modelsdatasource.modelsdatasource_jsp._jspService(modelsdatasource_jsp.java:410)
at org.apache.sling.scripting.jsp.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
at org.apache.sling.scripting.jsp.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:502)
at org.apache.sling.scripting.jsp.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:449)
at org.apache.sling.scripting.jsp.JspScriptEngineFactory.callJsp(JspScriptEngineFactory.java:339)
at org.apache.sling.scripting.jsp.JspScriptEngineFactory.access$100(JspScriptEngineFactory.java:97)

The workflow Instances/Archives/Failures pages were failing with the below exceptions

java.lang.NullPointerException
at org.apache.jsp.libs.cq.workflow.admin.console.components.datasource.workflowinstancedatasource.workflowinstancedatasource_jsp._jspService(workflowinstancedatasource_jsp.java:176)
at org.apache.sling.scripting.jsp.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
at org.apache.sling.scripting.jsp.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:502)
at org.apache.sling.scripting.jsp.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:449)
at org.apache.sling.scripting.jsp.JspScriptEngineFactory.callJsp(JspScriptEngineFactory.java:339)
at org.apache.sling.scripting.jsp.JspScriptEngineFactory.access$100(JspScriptEngineFactory.java:97)


java.lang.NullPointerException
at org.apache.jsp.libs.cq.workflow.admin.console.components.datasource.failureinstancedatasource.failureinstancedatasource_jsp._jspService(failureinstancedatasource_jsp.java:167)
at org.apache.sling.scripting.jsp.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
at org.apache.sling.scripting.jsp.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:502)
at org.apache.sling.scripting.jsp.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:449)
at org.apache.sling.scripting.jsp.JspScriptEngineFactory.callJsp(JspScriptEngineFactory.java:339)
at org.apache.sling.scripting.jsp.JspScriptEngineFactory.access$100(JspScriptEngineFactory.java:97)

There can be multiple reasons the pages can be blank in author mode, in this case, the pages were blanked due to the Adobe Granite Workflow Corecom.adobe.granite.workflow.core bundle was in Installed State



Somehow the restart of the AEM server has not helped to resolve the issue(not sure how this bundle has been to an Installed state, suspecting this is happened as part of Cloud Manager deployment). The issue got resolved after manually starting the bundle through the console






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