It’s bundled in “The IBM Development Package for Eclipse”…

The obligatory “java -version” :

C:\ibm_eclipse\ibm_sdk50>jre\bin\java -version
java version “1.5.0″
Java(TM) 2 Runtime Environment, Standard Edition (build pwi32dev-20051104)
IBM J9 VM (build 2.3, J2RE 1.5.0 IBM J9 2.3 Windows XP x86-32 j9vmwi3223-20051103 (JIT enabled)
J9VM – 20051027_03723_lHdSMR
JITÂ – 20051027_1437_r8
GCÂ Â – 20051020_AA)
JCLÂ – 20051102