Hy, am trying to generate some classes using the corresponding *.hbm.xml file and each time I got the following message in the console:

log4j:WARN No appenders could be found for logger (net.sf.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.


Can anyone please tell me why does these msg appears and how to remove them. They also appear when I do an schemaexport.

thanks in advance

Hibernate internally uses log4j for logging (or commons-logging).

To remove the error, make sure that you have a log4j.properties file in your classpath.

Hy, I did this before. That is placing the log4j.properties file in the classpath, but I got the following message and the warning still appears.
Thanks in advance

codegen:
[hbm2java] Processing 1 mapping files.
[hbm2java] java.util.zip.ZipException: error in opening zip file
[hbm2java] at java.util.zip.ZipFile.open(Native Method)
[hbm2java] at java.util.zip.ZipFile.<init>(ZipFile.java:112)
[hbm2java] at java.util.zip.ZipFile.<init>(ZipFile.java:128)
[hbm2java] at org.apache.tools.ant.AntClassLoader.getResourceURL(AntClassLoader.java:903)
[hbm2java] at org.apache.tools.ant.AntClassLoader.getResource(AntClassLoader.java:832)
[hbm2java] at org.apache.log4j.helpers.Loader.getResource(Loader.java:91)
[hbm2java] at org.apache.log4j.LogManager.<clinit>(LogManager.java:94)
[hbm2java] at org.apache.log4j.Logger.getLogger(Logger.java:85)
[hbm2java] at org.apache.commons.logging.impl.Log4JLogger.getLogger(Log4JLogger.java:229)
[hbm2java] at org.apache.commons.logging.impl.Log4JLogger.<init>(Log4JLogger.java:65)
[hbm2java] at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
[hbm2java] at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
[hbm2java] at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
[hbm2java] at java.lang.reflect.Constructor.newInstance(Constructor.java:274)
[hbm2java] at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:529)
[hbm2java] at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:235)
[hbm2java] at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:209)
[hbm2java] at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:351)
[hbm2java] at net.sf.hibernate.tool.hbm2java.CodeGenerator.<clinit>(CodeGenerator.java:32)
[hbm2java] at net.sf.hibernate.tool.hbm2java.Hbm2JavaTask.processFile(Hbm2JavaTask.java:145)
[hbm2java] at net.sf.hibernate.tool.hbm2java.Hbm2JavaTask.execute(Hbm2JavaTask.java:93)
[hbm2java] at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:269)
[hbm2java] at org.apache.tools.ant.Task.perform(Task.java:364)
[hbm2java] at org.apache.tools.ant.Target.execute(Target.java:301)
[hbm2java] at org.apache.tools.ant.Target.performTasks(Target.java:328)
[hbm2java] at org.apache.tools.ant.Project.executeTarget(Project.java:1215)
[hbm2java] at org.apache.tools.ant.Project.executeTargets(Project.java:1063)
[hbm2java] at org.apache.tools.ant.Main.runBuild(Main.java:632)
[hbm2java] at org.apache.tools.ant.Main.startAnt(Main.java:183)
[hbm2java] at org.apache.tools.ant.launch.Launcher.run(Launcher.java:197)
[hbm2java] at org.apache.tools.ant.launch.Launcher.main(Launcher.java:56)
[hbm2java] java.util.zip.ZipException: error in opening zip file
[hbm2java] at java.util.zip.ZipFile.open(Native Method)
[hbm2java] at java.util.zip.ZipFile.<init>(ZipFile.java:112)
[hbm2java] at java.util.zip.ZipFile.<init>(ZipFile.java:128)
[hbm2java] at org.apache.tools.ant.AntClassLoader.getResourceURL(AntClassLoader.java:903)
[hbm2java] at org.apache.tools.ant.AntClassLoader.getResource(AntClassLoader.java:832)
[hbm2java] at org.apache.log4j.helpers.Loader.getResource(Loader.java:91)
[hbm2java] at org.apache.log4j.LogManager.<clinit>(LogManager.java:96)
[hbm2java] at org.apache.log4j.Logger.getLogger(Logger.java:85)
[hbm2java] at org.apache.commons.logging.impl.Log4JLogger.getLogger(Log4JLogger.java:229)
[hbm2java] at org.apache.commons.logging.impl.Log4JLogger.<init>(Log4JLogger.java:65)
[hbm2java] at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
[hbm2java] at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
[hbm2java] at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
[hbm2java] at java.lang.reflect.Constructor.newInstance(Constructor.java:274)
[hbm2java] at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:529)
[hbm2java] at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:235)
[hbm2java] at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:209)
[hbm2java] at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:351)
[hbm2java] at net.sf.hibernate.tool.hbm2java.CodeGenerator.<clinit>(CodeGenerator.java:32)
[hbm2java] at net.sf.hibernate.tool.hbm2java.Hbm2JavaTask.processFile(Hbm2JavaTask.java:145)
[hbm2java] at net.sf.hibernate.tool.hbm2java.Hbm2JavaTask.execute(Hbm2JavaTask.java:93)
[hbm2java] at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:269)
[hbm2java] at org.apache.tools.ant.Task.perform(Task.java:364)
[hbm2java] at org.apache.tools.ant.Target.execute(Target.java:301)
[hbm2java] at org.apache.tools.ant.Target.performTasks(Target.java:328)
[hbm2java] at org.apache.tools.ant.Project.executeTarget(Project.java:1215)
[hbm2java] at org.apache.tools.ant.Project.executeTargets(Project.java:1063)
[hbm2java] at org.apache.tools.ant.Main.runBuild(Main.java:632)
[hbm2java] at org.apache.tools.ant.Main.startAnt(Main.java:183)
[hbm2java] at org.apache.tools.ant.launch.Launcher.run(Launcher.java:197)
[hbm2java] at org.apache.tools.ant.launch.Launcher.main(Launcher.java:56)
[hbm2java] log4j:WARN No appenders could be found for logger (net.sf.hibernate.util.DTDEntityResolver).
[hbm2java] log4j:WARN Please initialize the log4j system properly.