Christian Bindseil created LOG4J2-302:
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Summary: NDCPatternConverter broken in beta7
Key: LOG4J2-302
URL: https://issues.apache.org/jira/browse/LOG4J2-302
Project: Log4j 2
Issue Type: Bug
Components: Layouts
Affects Versions: 2.0-beta7
Reporter: Christian Bindseil
After an upgrade from version 2.0-beta4 to beta7 the NDCPatternConverter writes
an object-ID instead of the content of the NDC-stack.
We are using an pattern with "[%0.50x]". In beta4 the resulting output looks
like "[cbi@CE03178]" which means username and machine. Now in beta7 it looks
like "[logging.log4j.spi.MutableThreadContextStack@875ef7]".
I analysed the issue in NDCPatternConverter.format(...) method, where
event.getContextStack() is called and the result is passed to
StringBuilder.append(...), which means, that the toString()-method will be
invoked.
In beta4 getContextStack() returns an instance of ImmutableStack. This class
inherits its toString() method from AbstractList, where the elements of the
collection will be formatted human-readable.
Now in beta7 there comes an instance of MutableThreadContextStack which isn't
derived from AbstractList but implements the Collection-Interface. The
toString() method comes from Object and returns the name of the class and an
object-ID instead of the context of the unterlying stack/collection.
In my opinion you just need to copy or derive the toString() method from
AbstractList to solve this issue. Thank you in advance!
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