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From "Gary Gregory (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LOG4J2-914) ThrowableProxy.getExtendedStackTraceAsString causes NullpointerException
Date Tue, 27 Jan 2015 14:22:35 GMT

    [ https://issues.apache.org/jira/browse/LOG4J2-914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14293585#comment-14293585
] 

Gary Gregory commented on LOG4J2-914:
-------------------------------------

2.2 should be as soon as our RM is available. [~ralph.goers@dslextreme.com]?

> ThrowableProxy.getExtendedStackTraceAsString causes NullpointerException 
> -------------------------------------------------------------------------
>
>                 Key: LOG4J2-914
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-914
>             Project: Log4j 2
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 2.1
>            Reporter: Kaj Bjurman
>            Assignee: Gary Gregory
>            Priority: Minor
>             Fix For: 2.2
>
>
> I'm trying to write a poc with Log4j 2.1, where distributed processes are logging to
a remote server. The server is currently running the bundled TcpSocketServer.createSerializedSocketServer
with a custom layout plugin. 
> A process is logging an exception. I can then see in the custom layout plugin at the
log server that the LogEvent doesn't contain a thrown, but that it contains a thrownProxy.
So far so good. I'm then trying to get hold of a String representation of the message + stacktrace.
I thought that I would be able to e.g invoke ThrowableProxy.getExtendedStackTraceAsString(),
but that causes a NullPointerException since the throwable in the ThrowableProxy also is null
after deserialization. Looks like ThrowableProxy assumes that throwable isn't null in a few
methods. 
> The exception that is logged by the client process is a simple new Exception("A message");
> The pom.xml that I'm using:
> {code:xml}
> <dependency>
> 	<groupId>org.apache.logging.log4j</groupId>
> 	<artifactId>log4j-api</artifactId>
> 	<version>2.1</version>
> </dependency>
> <dependency>
> 	<groupId>org.apache.logging.log4j</groupId>
> 	<artifactId>log4j-core</artifactId>
> 	<version>2.1</version>
> </dependency>
> <dependency>
> 	<groupId>com.lmax</groupId>
> 	<artifactId>disruptor</artifactId>
> 	<version>3.3.0</version>
> </dependency>
> {code}
> The stacktrace that I get in the server:
> {code}
> 2014-12-05 14:30:44,601 ERROR An exception occurred processing Appender XXXXX java.lang.NullPointerException
> 	at org.apache.logging.log4j.core.impl.ThrowableProxy.getExtendedStackTraceAsString(ThrowableProxy.java:340)
> 	at org.apache.logging.log4j.core.impl.ThrowableProxy.getExtendedStackTraceAsString(ThrowableProxy.java:323)
> {code}
> Workaround:
> To invoke ThrowableProxy. getExtendedStackTrace() and format the stacktrace + message
with my own format methods.



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