gencon bug in IBM JDK earlier than SR5

be careful to use -Xgcpolicy:gencon when using JDK earlier than SR5.

there is a bug :

IZ23122: FAILURE TO FREE NURSERY RESULTS IN ENDLESS GC CYCLES

this can eventually lead the WAS to OOM as compaction doesn't take place
because of bad internal logic. u can witness that cpu usage top to 100% and do nothing just wasting whole cpu time to try gc.

use it carefully especially if u're using BPEL or ESB and handling large payload, though it's
not the the *best-fit* gcpolicy for them in most cases.

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