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

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org/apache/struts/tiles/DefinitionsFactoryException
java.lang.NoClassDefFoundError: org/apache/log4j/Category
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:2328)
at java.lang.Class.getConstructor0(Class.java:2640)
at java.lang.Class.getConstructor(Class.java:1629)

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