Why do I get a java.lang.NoSuchMethodError: org.objectweb.asm.ClassWriter.visit() error when running JRuby 1.X with a custom classpath?
The problem stems from an ASM jar conflict. It was found by setting a custom classpath, which includes a version of Spring that has a conflicting ASM jar, and then invoking JRuby. The easiest workaround is to build jruby-complete as a single jar and edit the JRuby config file (not sure about Windows, but it should be similar) to source only the jruby-complete jar. You will need to add ALL other jars, which I believe includes your jdbc driver as well.
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