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org.apache.tomcat.util.bcel.classfile.classformatexception: invalid byte tag in constant pool: 19

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Problem :

Getting strange error related to constant pool as follows
org.apache.tomcat.util.bcel.classfile.classformatexception: invalid byte tag in constant pool: 19
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1 Answer

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Solution :

This was actually a Tomcat bug that resurfaced again with the Java 9 bytecode. The exact versions which can fix this for both Java 8/9 bytecode are as follows:

  • trunk for 9.0.0.M18 and onwards
  • 8.5.x for 8.5.12 and onwards
  • 8.0.x for 8.0.42 and onwards
  • 7.0.x for 7.0.76 and onwards
If you follow above approch then your issue will be resolved.
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