Adam Bien's Weblog

JavaEE 7 Heals Crippled Jars And java.lang.ClassFormatError

JavaEE 6 APIs in Maven central were only usable for compiling. Any attempt to load the classes from

would result in:

java.lang.ClassFormatError: Absent Code attribute in method that is not native or abstract in class file javax/persistence/LockModeType
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClassCond(
        at java.lang.ClassLoader.defineClass(
        at Method)

The official Java EE 7 APIs do not have that problem any more:


If you are starting with JavaEE 7, just use the Essential Java EE 7 POM

When I spotted the "crippled" dependency in JavaEE 6 projects, I always asked "Do you write Unit Tests?". "Yes" answers were not honest. Now Java EE 7 killed my litmus tests :-)

The whole example with workaround was checked into The name of the project is: MavenUnitTestWithCrippledAPI. Just increase the dependency version to 7.0 and the unit tests should pass without any workarounds needed.

See you at Java EE Workshops at MUC Airport!

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Full week in December 2016: from Java EE 7 Bootstrap, Effective, Architectures over Testing to Microservices
On demand workshops: Java EE 7: Bootstrap, Effective, Testing and Microservices available for streaming.


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