Sorry, it isn't. It is part of javaagent.jar (see full name of the class: javassist.scopedpool.ScopedClassPoolFactory and you can also check it in the mentioned jar file).
But when I add the javassist.jar, it requires jboss-common-core.jar, then jboss-logging-spi.jar and then trove.jar. After all I get a message:
ERROR: transport error 202: gethostbyname: unknown host
ERROR: JDWP Transport dt_socket failed to initialize, TRANSPORT_INIT(510)
JDWP exit error AGENT_ERROR_TRANSPORT_INIT(197): No transports initialized [../../../src/share/back/debugInit.c:690]
FATAL ERROR in native method: JDWP No transports initialized, jvmtiError=AGENT_ERROR_TRANSPORT_INIT(197)
Any idea?