Why can't I use Lucene with IBM JDK 1.3.1?

Apparently there is a bug in IBM's JIT code in JDK 1.3.1. To work around it, disable JIT for the org.apache.lucene.store.OutputStream.writeInt method by setting the following environment variable:

JITC_COMPILEOPT=SKIP{org/apache/lucene/store/OutputStream}{writeInt}