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

1. ClassFormatException: Invalid byte tag in constant pool: 15 Overview

In this tutorial, We'll learn how to fix org.apache.tomcat.util.bcel.classfile.ClassFormatException: Invalid byte tag in constant pool: 15. This is a common issue while working with Tomcat 7 or Tomcat 8 version. We'll provide you the various solutions to fix this error permanently.

Addition to this issue, you can find the other set of trouble shooting problems.

[Fixed] Java 8: Invalid byte tag in constant pool: 15 or 19 - Tomcat

Common issues on the same error. The solution is common in all cases.

Invalid byte tag in constant pool: 15
Invalid byte tag in constant pool: 16
Invalid byte tag in constant pool: 18
Invalid byte tag in constant pool: 19

Let me tell my store with this problem and how did the troubleshoot this issue.

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

I have started working with java version 1.7 and Apache Tomcat/7.0.12. After some time my mind was completely changed. Felt very curious really waiting to work with java 8 features.

Read the article on Java 8 Lambda Expressions Feature