java.lang.NoClassDefFoundError：org / apache / log4j / PropertyConfigurator

Question

I have following jars in my project:

antlr.jar commons.collections-3.2.1.jar dom4j-1.6.jar hibernate-commons-annotations-4.0.1.Final.jar hibernate-core-4.0.1.Final.jar hibernate-jpa-2.0-api-1.0.1.Final.jar javassist-3.12.1.GA.jar jboss-logging.3.1.0.cr2.jar jboss-transaction-api_1.1_spec-1.0.0.Final.jar log4j-1.2.16.jar slf4j-api-1.6.4.jar slf4j-log4j12-1.6.4.jar

Code for the exception occurs:

ClassLoader loader = Thread.currentThread().getContextClassLoader(); URL url = loader.getResource("log4j.properties"); System.out.println(url); PropertyConfigurator.configure(url);

System.out.println(url) is as:

file:/D:/me/HibernateProject/build/classes/log4j.properties and the file exists and browser can browse the file.

log4j.properties file with following contents:

http://www.javatpoint.com/hibernate-logging-by-log4j-using-properties-file

Exception:

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/log4j/PropertyConfigurator at com.pkm.commands.UpdateUser.doWork(UpdateUser.java:29) at com.pkm.commands.UpdateUser.main(UpdateUser.java:15) Caused by: java.lang.ClassNotFoundException: org.apache.log4j.PropertyConfigurator at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:307) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:248) ... 2 more Java Result: 1

Answer 1

This error is generally seen if there is a problem with the classpath. Possibly the required jar is not present in the runtime classpath.

Answer 2

您应该配置Java构建路径，以确保订单和导出列表中的log4j.jar文件！