Struts problem report not working properly (Freemarker template error in
error.ftl at line 68 in conjunction with special exception types)
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Key: WW-3609
URL: https://issues.apache.org/jira/browse/WW-3609
Project: Struts 2
Issue Type: Bug
Affects Versions: 2.2.1
Environment: Sun JDK 1.6
Reporter: Markus Kreusch
Priority: Minor
I've a struts 2 application where the instantiation of an action leads to a
org.hibernate.exception.GenericJDBCException. This exception is "expected"
(during development) and because development mode is enabled it should lead to
a "Struts Problem Report" page showing the exception details.
The problem report page does not contain the full information of the exception
but a big yellow box titled "FreeMarker template error!" appears. Details
inside the box are:
Method public java.lang.String
org.hibernate.exception.NestableRuntimeException.getMessage(int) threw an
exception when invoked on org.hibernate.exception.GenericJDBCException: could
not execute query
The problematic instruction:
----------
==> ${msg[0]} [on line 68, column 29 in org/apache/struts2/dispatcher/error.ftl]
freemarker.template.TemplateModelException: Method public java.lang.String
org.hibernate.exception.NestableRuntimeException.getMessage(int) threw an
exception when invoked on org.hibernate.exception.GenericJDBCException: could
not execute query
at
freemarker.ext.beans.SimpleMethodModel.exec(SimpleMethodModel.java:130)
.... [part of the stack trace ommited]
Caused by: java.lang.NullPointerException
at
freemarker.ext.beans.SimpleMemberModel.unwrapArguments(SimpleMemberModel.java:85)
at
freemarker.ext.beans.SimpleMethodModel.exec(SimpleMethodModel.java:106)
... 47 more
I could determine the exact position of the NullPointerException by debugging
the code. I'm not sure why but the class SimpleMemberModel gets instantiated
with the method
org.hibernate.exception.NestableRuntimeException.getMessage(int) and null for
the argTypes array. This leads to the NullPointerException at line 85 (int
typeLen = argTypes.length;). Maybe struts is "confused" because the class
org.hibernate.exception.NestableRuntimeException contains two methods called
getMessage one without and one with an int as parameter. I'll try to create a
minimal example to reproduce the behaviour as soon as possible.
The main problem with this issue is that the stack trace of the former
exception is swallowed, not printed in the logfile or anywhere else. Please
check and hopefully fix this it took some hours to understand what the reason
of this error is.
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