The following test class seems to hang at
LogManager.shutdown() when run with the jar produced by the
current cvs build (1.3alpha 18/06/03). This does not occur
with the released 1.2.8 jar.
Further investigation points towards a deadlock in
ReaderWriterLock. Printing out the existing debug lines in
ReaderWriterLock to sysout produces the following output
when run with the test class and config below:
Only tried on win2k pro. with jdk:
java version "1.4.0"
Java(TM) 2 Runtime Environment, Standard Edition (build
1.4.0-b92)
Java HotSpot(TM) Client VM (build 1.4.0-b92, mixed mode)
ReaderWriterLock: Asking for write lock
ReaderWriterLock: Got write lock
ReaderWriterLock: About to release write lock
piblicID: [null]
systemId: [dummy://log4j.dtd]
log4j: Threshold ="null".
ReaderWriterLock: Asking for write lock
ReaderWriterLock: Got write lock
ReaderWriterLock: About to release write lock
log4j: Class name: [org.apache.log4j.ConsoleAppender]
ReaderWriterLock: Asking for read lock
ReaderWriterLock: Got read lock
ReaderWriterLock: About to release read lock
ReaderWriterLock: Asking for read lock
ReaderWriterLock: Got read lock
log4j: xml.DOMConfigurator - Handling nested <layout> for
appender CONSOLE
ReaderWriterLock: About to release read lock
ReaderWriterLock: Asking for read lock
ReaderWriterLock: Got read lock
ReaderWriterLock: About to release read lock
ReaderWriterLock: Asking for read lock
ReaderWriterLock: Got read lock
log4j: config.PropertySetter - Found setter method for
property [layout] in class org.apache.log4j.
ConsoleAppender
ReaderWriterLock: About to release read lock
ReaderWriterLock: Asking for read lock
ReaderWriterLock: Got read lock
ReaderWriterLock: About to release read lock
ReaderWriterLock: Asking for read lock
ReaderWriterLock: Got read lock
log4j: xml.DOMConfigurator - Will instantiate instance of
class [org.apache.log4j.SimpleLayout]
ReaderWriterLock: About to release read lock
ReaderWriterLock: Asking for read lock
ReaderWriterLock: Got read lock
ReaderWriterLock: About to release read lock
ReaderWriterLock: Asking for read lock
ReaderWriterLock: Got read lock
log4j: config.PropertySetter - Set child component of type
[org.apache.log4j.SimpleLayout] for [org
.apache.log4j.ConsoleAppender].
ReaderWriterLock: About to release read lock
log4j: Adding appender named [CONSOLE] to category [root].
ReaderWriterLock: Asking for write lock
ReaderWriterLock: Got write lock
ReaderWriterLock: About to release write lock
ReaderWriterLock: Asking for read lock
ReaderWriterLock: Got read lock
ReaderWriterLock: About to release read lock
ReaderWriterLock: Asking for read lock
ReaderWriterLock: Got read lock
DEBUG - Test debug message
ReaderWriterLock: About to release read lock
ReaderWriterLock: Asking for read lock
ReaderWriterLock: Got read lock
ReaderWriterLock: About to release read lock
ReaderWriterLock: Asking for read lock
ReaderWriterLock: Got read lock
INFO - Test info message
ReaderWriterLock: About to release read lock
ReaderWriterLock: Asking for read lock
ReaderWriterLock: Got read lock
ReaderWriterLock: About to release read lock
ReaderWriterLock: Asking for read lock
ReaderWriterLock: Got read lock
WARN - Test warn message
ReaderWriterLock: About to release read lock
ReaderWriterLock: Asking for read lock
ReaderWriterLock: Got read lock
ReaderWriterLock: About to release read lock
ReaderWriterLock: Asking for read lock
ReaderWriterLock: Got read lock
ERROR - Test error message
ReaderWriterLock: About to release read lock
ReaderWriterLock: Asking for read lock
ReaderWriterLock: Got read lock
ReaderWriterLock: About to release read lock
ReaderWriterLock: Asking for read lock
ReaderWriterLock: Got read lock
FATAL - Test fatal message
java.lang.Exception: Test Exception
at com.jade.logtest.Tester2.<init>(Tester2.java:16)
at com.jade.logtest.Tester2.main(Tester2.java:26)
ReaderWriterLock: About to release read lock
Tester2: logging finished
Tester2: shutting down log4j:
ReaderWriterLock: Asking for read lock
ReaderWriterLock: Got read lock
ReaderWriterLock: Asking for read lock
ReaderWriterLock: Got read lock
ReaderWriterLock: Asking for read lock
ReaderWriterLock: Got read lock
ReaderWriterLock: Asking for read lock
ReaderWriterLock: Got read lock
ReaderWriterLock: Asking for read lock
ReaderWriterLock: Got read lock
ReaderWriterLock: Asking for write lock
<<<!--- hangs here ---!>>>
test class:
package com.jade.logtest;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;
public class Tester2
{
private Logger log = Logger.getLogger(Tester2.class);
public Tester2()
{
log.debug("Test debug message");
log.info("Test info message");
log.warn("Test warn message");
log.error("Test error message");
log.fatal("Test fatal message", new Exception("Test
Exception"));
System.out.println("Tester2: logging finished");
System.out.println("Tester2: shutting down log4j:");
LogManager.shutdown();
System.out.println("Tester2: log4j has been shutdown");
}
public static void main(String[] args)
{
new Tester2();
}
}
test config:
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/";
debug="true">
<appender name="CONSOLE" class="org.apache.log4j.ConsoleAppender">
<layout class="org.apache.log4j.SimpleLayout"/>
</appender>
<root>
<appender-ref ref="CONSOLE"/>
</root>
</log4j:configuration>
I'm posting this to the dev list to see if somebody can
confirm i'm not being stupid. If so i can log it as a bug
if required.
Regards
Andy
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