getting Invalid byte tag in constant pool : 19

Question

i am creating one webservice and getting error like org.apache.tomcat.util.bcel.classfile.ClassFormatException: Invalid byte tag in constant pool: 19. i am using tomcat 8.0 and java versoin is 1.8.0.152.

Answer 1

A constant pool entry with tag type 19 is a module descriptor; see JVM spec table 4.4-A. I think you have attempted to use BCEL on a class compiled with a Java 9 (or later) compiler:

• The BCEL version you are using doesn't understand the tag.
• The class wouldn't load in a Java 8 JVM anyway. Modules were only introduced in Java 9, and the class file's major version number should be too recent for a Java 8 JVM.