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JAXB 2.0 API is being loaded from the bootstrap classloader, but this RI (xxx) needs 2.1 API

FAQ > Errors > Exceptions > JAXB 2.0 API is being loaded from the bootstrap classloader, but this RI (xxx) needs 2.1 API

When using JDK 6 (up to JDK 6 Update 3) to run ActiveMQ Classic you can run into this exception. There are two solutions to this:

Upgrade to JDK to 1.6.0_04 or above, which includes JAXB 2.1
Copy JAXB 2.1 to <JAVA_HOME>/lib/endorsed to override the API jars that ship with the JDK