StandardException.printStackTrace() does not print the nested exception (cause)
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Key: DERBY-2181
URL: http://issues.apache.org/jira/browse/DERBY-2181
Project: Derby
Issue Type: Bug
Affects Versions: 10.2.1.6
Environment: Java 1.5
Reporter: Christian d'Heureuse
In my Servlet application, an I/O error occurred, but I couldn't see the error
message of the I/O error.
At line 298 in StandardException.java, the I/O exception is packed into a
StandardException:
throw StandardException.newException(
SQLState.DATA_UNEXPECTED_EXCEPTION, ioe);
When my Servlet catches the exception, it calls Throwable.printStackTrace() to
generate a detailed error message. The output of printStackTrace() does not
list the nested I/O exception.
In Java 1.5, Throwable.printStackTrace() calls getCause() to get the nested
exception. GetCause() returns null, because the cause has not been set.
One solution could be to override Throwable.getCause() and initCause() in
StandardException to get and set the nested exception. There are already
getNestedException() and setNestedException() methods in StandardException
which could be mapped to getCause() and initCause().
Another solution could be to change the constructor
StandardException(String messageID, Throwable t, Object[] args)
This constructor currently calls
super(messageID);
Instead it could call
super(messageID,t);
to pass the nested Exception.
StandardException.setNestedException() could be changed to call
Throwable.initCause(). But the API docs of initCause() state stat "This method
can be called at most once". So it's probably better to override getCause() and
initCause().
A problem might me that Throwable.getCause() and initCause() have been
introduced in Java 1.4. But if these methods are implemented in
StandardException, they would be just normal methods in Java 1.3 and overrides
in Java >= 1.4.
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