How can I see a full log of exceptions in JAVA?

java exception-logging
aqjune picture aqjune · Sep 1, 2012 · Viewed 16.9k times · Source

When I run some java program with a command java ExceptionTest , exceptions are sometimes omitted and looks like

Exception in thread "main" java.lang.NoClassDefFoundError: aa/bb/DD
        at SOMEWHERE(unknown source)
Caused by: java.lang.ClassNotFoundException: aaa.bbb.CC
        at SOMEWHER(unknown source)
        ... 13 more

I'd like to see 13 more exceptions in this case. Is there an option to see all exception log?

Answer

Tomasz Nurkiewicz picture Tomasz Nurkiewicz · Sep 1, 2012

You already see them, it's only the ridiculous way Java (and Logback by defaul) prints exceptions by default. This stack trace:

Exception in thread "main" java.lang.NoClassDefFoundError: aa/bb/DD
        at SOMEWHERE(unknown source)
Caused by: java.lang.ClassNotFoundException: aaa.bbb.CC
        at SOMEWHER(unknown source)
        ... 13 more

actually means the following program flow (from bottom to top):

Caused by: java.lang.ClassNotFoundException: aaa.bbb.CC
        at SOMEWHER(unknown source)
Exception in thread "main" java.lang.NoClassDefFoundError: aa/bb/DD
        at SOMEWHERE(unknown source)

The ... 13 more (N common frames omitted in Logback) only means that these exceptions were already printed before. In Logback you can restructure stack track to avoid duplicates and print stack lines always in correct order, see my blog.

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