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Could not initialize class net.sf.cglib.proxy.Enhancer

Problem

The error message was:

Could not initialize class net.sf.cglib.proxy.Enhancer

The nested exception leading up to this was:

java.lang.NoClassDefFoundError: Could not initialize class net.sf.cglib.proxy.Enhancer

Solution

  • Increase Spring logging to debug in log4j.xml.
  • The issue initially began with java.lang.NoClassDefFoundError: org/objectweb/asm/Type.
  • The problem could be due to a class conflict: the Type class has moved in newer version of Spring. Try removing the old cglib from the classpath and ensure the asm.jar in use is the latest one.