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https://issues.apache.org/jira/browse/LOG4J2-2067?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16205055#comment-16205055
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Paul Burrowes commented on LOG4J2-2067:
---------------------------------------
This tests the patch. I would create a PR but I'm a bit pressed for time this
month.
> Using PatternSelectors breaks header printing in PatternLayout
> --------------------------------------------------------------
>
> Key: LOG4J2-2067
> URL: https://issues.apache.org/jira/browse/LOG4J2-2067
> Project: Log4j 2
> Issue Type: Bug
> Components: Layouts, Pattern Converters
> Affects Versions: 2.8.2, 2.9.0
> Reporter: Paul Burrowes
>
> Using a config of
> {code}
> <?xml version="1.0" ?>
> <Configuration name="LOG4j2-1964 demo" status="ERROR">
> <Appenders>
> <Console name="consoleLog" target="SYSTEM_ERR">
> <PatternLayout pattern="%msg{nolookups}%n%throwable{none}"/>
> </Console>
> <RollingFile name="fooAppender" fileName="foo.log"
> filePattern="foo.log.%i">
> <PatternLayout header="log file started%n">
> <MarkerPatternSelector defaultPattern="%d{yyyy-MM-dd HH:mm:ss.SSSZ}
> %msg{nolookups}%n">
> <PatternMatch key="Trace" pattern="%d{yyyy-MM-dd HH:mm:ss.SSSZ}
> TRACER %msg{nolookups}%n"/>
> </MarkerPatternSelector>
> </PatternLayout>
> <SizeBasedTriggeringPolicy size="10MB"/>
> </RollingFile>
> </Appenders>
> <Loggers>
> <Root level="INFO">
> <AppenderRef ref="consoleLog"/>
> <AppenderRef ref="fooAppender"/>
> </Root>
> </Loggers>
> </Configuration>
> {code}
> the header is expected to be formatted according to the pattern configured
> but instead the output is
> {code}
> 2017-10-09 14:25:12.072+1300
> 2017-10-09 14:25:12.143+1300 using interpolation and a throwable
> java.lang.NullPointerException
> java.lang.NullPointerException: null
> at leliel.Main.main(Main.java:51) [Log4j2-testing/:?]
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> ~[?:1.7.0_79]
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> ~[?:1.7.0_79]
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> ~[?:1.7.0_79]
> at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_79]
> at
> com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
> [idea_rt.jar:?]
> 2017-10-09 14:25:12.151+1300 throwable only
> {code}
> The fix appears to simply be to not provide the PatternSelector to the header
> and footer Serializer builders.
> {code}
> diff --git
> a/log4j-core/src/main/java/org/apache/logging/log4j/core/layout/PatternLayout.java
>
> b/log4j-core/src/main/java/org/apache/logging/log4j/core/layout/PatternLayout.java
> index e4440eb9b..39042081f 100644
> ---
> a/log4j-core/src/main/java/org/apache/logging/log4j/core/layout/PatternLayout.java
> +++
> b/log4j-core/src/main/java/org/apache/logging/log4j/core/layout/PatternLayout.java
> @@ -108,7 +108,7 @@ public final class PatternLayout extends
> AbstractStringLayout {
> newSerializerBuilder()
> .setConfiguration(config)
> .setReplace(replace)
> - .setPatternSelector(patternSelector)
> + .setPatternSelector(null)
> .setAlwaysWriteExceptions(alwaysWriteExceptions)
> .setDisableAnsi(disableAnsi)
> .setNoConsoleNoAnsi(noConsoleNoAnsi)
> @@ -117,7 +117,7 @@ public final class PatternLayout extends
> AbstractStringLayout {
> newSerializerBuilder()
> .setConfiguration(config)
> .setReplace(replace)
> - .setPatternSelector(patternSelector)
> + .setPatternSelector(null)
> .setAlwaysWriteExceptions(alwaysWriteExceptions)
> .setDisableAnsi(disableAnsi)
> .setNoConsoleNoAnsi(noConsoleNoAnsi)
> {code}
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