[logback-user] Unable to Initialize Logger in JDK1.4

[Ceki Gulcu]

Hi Brian,

Raphael and I spent a few minutes studying your bug report.

Placing slf4j-jdk14-1.3.0.jar makes the problem harder to reproduce because if 
slf4j-jdk14-1.3.0.jar comes before logback-classic-0.9.5-jdk14.jar, then logback 
classes cannot be seen by SLF4J API.

Removing slf4j-jdk14-1.3.0.jar is necessary but not sufficient to reproduce the 
problem. You also need a logback-test.xml or logback.xml file available 
somewhere on the class path. When these conditions are fulfilled, then we 
observe the NoClassDefFoundError you reported which can be explained as follows.

We recently added a new component to Joran, namely JMXConfiguratorAction, which 
requires JMX support (available in JDK 1.5). When logback is loaded into memory, 
it will check whether the aforementioned configuration files are available on 
the class path. If so, logback will create an instance of Joran to parse the 
config file. However, to load Joran one needs JMXConfiguratorAction which in 
turn requires JMX, hence the exception.

We can attempt to fix this bug by loading JMXConfiguratorAction only under JDK 
1.5. We'll let you know how it goes.

Thanks for using logback.


Brian Suksomwong wrote:
> Hey all,
> 
> I'm trying to test logback's JDK1.4 support, but am receiving a 
> NoClassDefNotFoundException when running my test class.
> 
> Test Class:
> import org.slf4j.Logger;
> import org.slf4j.LoggerFactory ;
> 
> public Test {
>   public static void main(String args[]) {
>     Logger log = LoggerFactory.getLogger(Test.class);
>     System.out.prinln(log.getName());
>   }
> }
> 
> My classpath includes:
> logback-classic-0.9.5-jdk14.jar
> logback-core-0.9.5-jdk14.jar
> slf4j-api-1.3.0.jar
> slf4j-jdk14-1.3.0.jar (just in case, but I receive the same error 
> without it)
> 
> When I try to run the class I receive the following stack trace:
> java.lang.NoClassDefFoundError : javax/management/ObjectName
> at 
> ch.qos.logback.classic.joran.JoranConfigurator.addInstanceRules(JoranConfigurator.java:62)
> at 
> ch.qos.logback.core.joran.GenericConfigurator.buildInterpreter(GenericConfigurator.java 
> :83)
> at 
> ch.qos.logback.core.joran.JoranConfiguratorBase.buildInterpreter(JoranConfiguratorBase.java:82)
> at 
> ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:95)
> at ch.qos.logback.core.joran.GenericConfigurator.doConfigure 
> (GenericConfigurator.java:74)
> at 
> ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:38)
> at 
> ch.qos.logback.classic.util.ContextInitializer.configureByResource(ContextInitializer.java 
> :24)
> at 
> ch.qos.logback.classic.util.ContextInitializer.autoConfig(ContextInitializer.java:35)
> at 
> ch.qos.logback.classic.util.ContextInitializer.autoConfig(ContextInitializer.java:46)
> at org.slf4j.impl.StaticLoggerBinder.initialize (StaticLoggerBinder.java:52)
> at org.slf4j.impl.StaticLoggerBinder.<init>(StaticLoggerBinder.java:44)
> at org.slf4j.impl.StaticLoggerBinder.<clinit>(StaticLoggerBinder.java:39)
> at org.slf4j.LoggerFactory .<clinit>(LoggerFactory.java:57)
> at Test.main(Test.java:6)
> ... Removed 21 stack frames
> 
> 
> The javax/management package is not in JDK1.4, but is in JDK1.5.  I 
> think there is a binding issue happening; please help me solve this 
> issue if possible.
> 
> 
> Thanks!
> 
> -B-
> 
> 
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> 
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-- 
Ceki Gülcü
Logback: The reliable, generic, fast and flexible logging framework for Java.
http://logback.qos.ch