Byteman currently disallows injection of rule code into

i) classes in packages matching org.jboss.byteman.
(except for those which also match org.jboss.byteman.tests.* – we want to be able to run tests
ii) classes in packages matching java.lang.*

It would be nice (albeit dangerous if misused) if it were possible to configure Byteman to allow injection into java.lang.* classes e.g. injection of tracing rules into java.lang.Thread would be helpful.

A simple mechanism to disable the restriction would be to set a System property

org.jboss.byteman.quodlibet

to any value (oh the joys of classical education!)