org.apache.tomcat.util.bcel.classfile.ClassFormatException: Invalid byte tag in constant pool: 15 - Tomcat 7, JDK incompatibilty? [duplicate]

Answer 1

I was seeing this error with Tomcat 7.0.26.

To answer your question, Tomcat is to blame: https://issues.apache.org/bugzilla/show_bug.cgi?id=53735

Upgrading to version 7.0.53 fixed it for me (according to the linked issue, the fix should be in 7.0.30 and later).

Answer 2

I also faced this problem. I followed the error and I foud out I needed to upgrade to the latest version our maven dependency for ICU4J jar.

And the error is gone now:

  <dependency>
     <groupId>com.ibm.icu</groupId>
     <artifactId>icu4j</artifactId>
     <version>56.1</version>
  </dependency>

Answer 3

I had Java 8 on my computer, but I wanted to run my Tomcat using Java 7.

The following solution worked for me.

In %CATALINA_HOME%\bin\ (E.g.: C:\Tomcat\bin) add setenv.bat having the following content:

@echo off
set JAVA_HOME=C:\Program Files\Java\jdk1.7.0_03
set JRE_HOME=%JAVA_HOME%\jre
exit /B 0

When you run startup.bat, the following calls happen:

startup.bat
     |
     └── catalina.bat
               |
               └── setenv.bat

• see:

  if not exist "%CATALINA_BASE%\bin\setenv.bat" goto checkSetenvHome
  call "%CATALINA_BASE%\bin\setenv.bat"