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

Question

Problem :

Getting strange error related to constant pool as follows

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

Answer 1

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.