Kaj Bjurman created LOG4J2-914:
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Summary: 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
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:
<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>
The stacktrace that I get in the server:
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)
Workaround:
To invoke ThrowableProxy. getExtendedStackTrace() and format the stacktrace +
message with my own format methods.
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