java.lang.NoClassDefFoundError: org/apache/log4j/Category))

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java.lang.NoClassDefFoundError: org/apache/log4j/Category
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:1590)
at java.lang.Class.getConstructor0(Class.java:1762)
at java.lang.Class.getConstructor(Class.java:1002)
at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:410)
at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:529)
at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:235)
at box.BoxImplWithJCL.doOp(BoxImplWithJCL.java:23)
at ch.qos.test.ChildFirstTestJCL2.main(ChildFirstTestJCL1.java:42)

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