Hi users of Apache Lucene Core and Apache Solr,
Oracle released Java 7u1  on October 19. According to the release notes and tests done by the Lucene committers, all bugs reported on July 28 are fixed in this release, so code using Porter stemmer no longer crashes with SIGSEGV. We were not able to experience any index corruption anymore, so it is safe to use Java 7u1 with Lucene Core and Solr.
Uwe Schindler, Apache Lucene PMC Member, on behalf of the Apache Lucene/Solr committers, in a mailing list post.