[weld-issues] [JBoss JIRA] Created: (WELD-531) Weld swallowing stacktrace when multiple container errors

[Dan Allen (JIRA)]

Weld swallowing stacktrace when multiple container errors
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                 Key: WELD-531
                 URL: https://jira.jboss.org/browse/WELD-531
             Project: Weld
          Issue Type: Bug
    Affects Versions: 1.0.1.Final
            Reporter: Dan Allen


When there are multiple container errors (for instance, definition errors at startup), Weld cycles through the errors and builds a localized message. However, it drops the cause of the exception. If the message is further up the chain (i.e., in the exception cause), this leads to exceptions such as:

Exception #0: null

The user is lost as to what the real problem is. Typically root causes are:

- NoClassDefFoundError
- NullPointerException

The problem is not that the message is null. The problem is that the underlying cause is dropped.

This came up recently when using Arquillian as reported in this forum post: https://community.jboss.org/message/544395#544395

When placed in a debugger, it turned out that a NoClassDefFoundError was being thrown. There was no way for the user to trace that to the source.

I think that what Weld needs to do is follow the cause until it finds a non-null message.

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