Report throws NullPointerException in JasperReports Server, runs fine in Jaspersoft Studio

Issue description

The following error is being thrown when running a report published from Jaspersoft Studio:

Error Message

null (Error UID: 21cddd74-69da-4005-b5e0-1a12852d7004)

Error Trace

java.lang.NullPointerException at com.jaspersoft.jasperserver.api.engine.jasperreports.util.repo.RepositoryConnection.getInputStream(RepositoryConnection.java:120)
at java.net.URL.openStream(URL.java:1048)
at net.sf.jasperreports.engine.util.JRLoader.getInputStream(JRLoader.java:339)
at net.sf.jasperreports.repo.DefaultRepositoryService.getInputStream(DefaultRepositoryService.java:99)
...

The report works fine in Jaspersoft Studio though.

Solution

The error message does directly point to it, but this type of stack trace can show up when a resource referenced by report (for example an image) in not accessible. The common causes for such resource being unaccessible are:

• The resource is placed in a different organization (which can also be a parent organization). In this case you need to move the resource to your current org, or to the Public folder

• The resource has been removed

There is also an existing enhancement request submitted on the internal JasperReports Server tracker to make the error message more informative in such cases.