| Author |
Message
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| j.f.sorge |
 Posted: Tue May 06, 2008 8:54 am Post subject: ConfigManagerProxy setLogger method fails |
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Master
Joined: 27 Feb 2008
Posts: 218
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Hi all!
I wanted to log from an application using a wrapped ConfigManagerProxy API. For this I used the ConfigManagerProxy.setLogger(String) method as below
| Code: |
| ConfigManagerProxy.setLogger(MessageBrokerProxyLogger.class.getName()); |
The class MessageBrokerProxyLogger is implemented as shown below
| Code: |
/*
* Created on May 6, 2008
* Created by d291663
*/
package com.ibm.broker.config.proxy;
//removed imports
/**
* Class to wrap TubLogger into ConfigManagerProxy API.
*
* @author d291663
* @version $Id$
*/
public class MessageBrokerProxyLogger extends Logger {
//removed logger
/**
* Create instance of MessageBrokerProxyLogger - will wrap TubLogger into ConfigManagerProxy
* API.
*/
public MessageBrokerProxyLogger() {
super();
}
/**
* overriden method. Log with debug log level and call super method.
*
* @see com.ibm.broker.config.proxy.Logger#fine(java.lang.String).
*/
public void fine(String aMessage) {
if (logger.isDebugEnabled()) {
logger.debug(aMessage);
}
super.fine(aMessage);
}
/**
* overriden method. Log with debug log level and call super method.
*
* @see com.ibm.broker.config.proxy.Logger#finer(java.lang.String).
*/
public void finer(String aMessage) {
if (logger.isDebugEnabled()) {
logger.debug(aMessage);
}
super.finer(aMessage);
}
/**
* overriden method. Log with debug log level and call super method.
*
* @see com.ibm.broker.config.proxy.Logger#finest(java.lang.String).
*/
public void finest(String aMessage) {
if (logger.isDebugEnabled()) {
logger.debug(aMessage);
}
super.finest(aMessage);
}
/**
* overriden method. Log with info log level and call super method.
*
* @see com.ibm.broker.config.proxy.Logger#info(java.lang.String).
*/
public void info(String aMessage) {
logger.info(aMessage);
super.info(aMessage);
}
/**
* overriden method. Log with fatal log level and call super method.
*
* @see com.ibm.broker.config.proxy.Logger#severe(java.lang.String).
*/
public void severe(String aMessage) {
logger.fatal(aMessage);
super.severe(aMessage);
}
/**
* overriden method. Log with warn log level and call super method.
*
* @see com.ibm.broker.config.proxy.Logger#warning(java.lang.String).
*/
public void warning(String aMessage) {
logger.warn(aMessage);
super.warning(aMessage);
}
}
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When I try to set the logger it fails with the following StackTraces
| Code: |
2008-05-06 18:37:27,203 FATAL MessageBrokerProxy.setLogger():197 could not initialize logger com.ibm.broker.config.proxy.MessageBrokerProxyLogger
com.ibm.broker.config.proxy.ConfigManagerProxyLoggedException: Could not instantiate com.ibm.broker.config.proxy.MessageBrokerProxyLogger after com.ibm.broker.config.proxy.ConfigManagerProxyLoggedException (Could not instantiate after java.lang.ClassNotFoundException ())
at com.ibm.broker.config.proxy.Logger.getLogger(Logger.java:156)
at com.ibm.broker.config.proxy.ConfigManagerProxy.setLogger(ConfigManagerProxy.java:938)
at com.ibm.broker.config.proxy.ConfigManagerProxy.setLogger(ConfigManagerProxy.java:965)
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Does anyone know how to initialize the logger correctly?
Thanks in advance! |
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| mqmatt |
| Posted: Wed May 07, 2008 5:23 am Post subject: |
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Grand Master
Joined: 04 Aug 2004
Posts: 1213
Location: Hursley, UK
|
The error suggests a simple CLASSPATH error; the CMP is just trying to load your class using Class.forName(). Make sure that the JAR file containing your class is available on the CLASSPATH.
Also, it's good practice to use your own package name rather than com.ibm.broker.config.proxy.
Cheers
-Matt |
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| j.f.sorge |
| Posted: Thu May 08, 2008 12:20 am Post subject: |
|
|
Master
Joined: 27 Feb 2008
Posts: 218
|
| mqmatt wrote: |
The error suggests a simple CLASSPATH error; the CMP is just trying to load your class using Class.forName(). Make sure that the JAR file containing your class is available on the CLASSPATH.
Also, it's good practice to use your own package name rather than com.ibm.broker.config.proxy.
Cheers
-Matt |
I wanted to use a different package than the IBM one, but the constructor / the class Logger is not visible of I use a different one. Therefore I created my own class in the same package. My own logger class should be in CLASSPATH as it is in the same .jar as the class which intializes the ConfigManagerProxy API.
Probably it is a version issue?!
my ConfigManagerProxy.jar manifest says
| Code: |
Manifest-Version: 1.0
Created-By: 1.4.2 (IBM Corporation) |
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| mqmatt |
| Posted: Thu May 08, 2008 1:01 am Post subject: |
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Grand Master
Joined: 04 Aug 2004
Posts: 1213
Location: Hursley, UK
|
The simple way to find out if your class is available is to try instantiating your class from your main() method.
The exception you're seeing is the ClassNotFoundException from this method:
http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Class.html#forName(java.lang.String)
...which has quite an explicit meaning.
Include the (java.lang.String) bit on the URL to get to the method directly. I couldn't get the [url] tag to work. |
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| j.f.sorge |
| Posted: Fri May 16, 2008 5:34 am Post subject: |
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Master
Joined: 27 Feb 2008
Posts: 218
|
| mqmatt wrote: |
The simple way to find out if your class is available is to try instantiating your class from your main() method.
The exception you're seeing is the ClassNotFoundException from this method:
http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Class.html#forName(java.lang.String)
...which has quite an explicit meaning.
Include the (java.lang.String) bit on the URL to get to the method directly. I couldn't get the [url] tag to work. |
I implemented a JUnit test to instantiate the Logger and it works
| Code: |
/**
* Test if Class.forName works.
*
* @throws Exception
* Is thrown if anything goes wrong.
*/
public void testClassForName() throws Exception {
Class test = Class.forName(MessageBrokerProxyLogger.class.getName());
assertNotNull(test);
MessageBrokerProxyLogger logger = (MessageBrokerProxyLogger) test.newInstance();
assertNotNull(logger);
} |
So I really don't know why it fails when I use the setLogger method. |
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