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    If you're using multiple frameworks on your project, check if this is not a problem between mismatched versions of javassist between them.

Solutions on the web

via Pentaho BI Platform Tracking by Nick Midson, 1 year ago
via Pentaho BI Platform Tracking by Nick Midson, 1 year ago
via fiji.sc by Unknown author, 2 years ago
invalid constant type: 18 at 168
via Stack Overflow by Unknown author, 1 year ago
java.io.IOException: invalid constant type: 18	at javassist.bytecode.ConstPool.readOne(ConstPool.java:1090)	at javassist.bytecode.ConstPool.read(ConstPool.java:1033)