Frank Wißmann created LOG4J2-774:
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Summary: NdcPatternConverter brakes Log4j 1.2.x layout
Key: LOG4J2-774
URL: https://issues.apache.org/jira/browse/LOG4J2-774
Project: Log4j 2
Issue Type: Bug
Components: Layouts
Affects Versions: 2.0.1
Reporter: Frank Wißmann
Priority: Minor
Fix For: 2.0.2
In Log4j 1.2.17 NdcPatternConverter.format() returns an empty string "" or the
stack messages separated by space "a b c" (NDC.DiagnosticContext.fullMessage).
The PatternLayout \[%20.20x\] results in {{\[ \]}} or {{\[
a b c\]}}.
In Log4j 2.0.1 NdcPatternConverter.format() returns an unmodified
Collection.toString() representation: "\[\]" for an empty collection or the
collection separated by comma "\[a, b, c\]"
(DefaultThreadContextStack.toString() and MutableThreadContextStack.toString()).
The PatternLayout \[%20.20x\] results in {{\[ \[\]\]}} or {{\[
\[a, b, c\]\]}}.
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