. Make the version numbers consistent so they can be compared correctly.

E.g. for jdk1.6.0 and openjdk6 will use '6' as the version.

. Modify the preference order for Java VMs used by the internal fallback

logic to reflect that openjdk is now the default Java VM rather than diablo.

. Remove code for Java vendors that are no longer in the ports tree (e.g.

blackdown, ibm).

. Remove code for handling version numbers that are no longer present in

the tree (e.g. only 1.5 and up is supported).

. Note that openjdk is a native Java VM.
. If the environment variable JAVAVM_FALLBACK_ONLY is set then only use the

internal logic to select a Java VM, don't use the ports logic even if the
ports collection is installed. [1]

. Update the manual page for JAVAVM_FALLBACK_ONLY.
. Bump version to 2.4.

PR: 167799 [1]