From http://java.net/jira/browse/MACOSX_PORT-432:

dhcp-santaclara22-2fl-west-10-132-182-138:~ jeffhsiao$ /Users/jeffhsiao/Library/Java/JavaVirtualMachines/j2sdk-h500/bin/java -XstartOnFirstThread -jar eclipse/plugins/org.eclipse.equinox.launcher_1.2.0.v20110502.jar
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A fatal error has been detected by the Java Runtime Environment:
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SIGBUS (0xa) at pc=101b3b18b, pid=31954, tid=140735091378528
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JRE version: 7.0-b209
Java VM: OpenJDK 64-Bit Server VM (21.0-b17 mixed mode bsd-amd64 compressed oops)
Problematic frame:
J java.util.zip.ZipFile.getZipEntry(Ljava/lang/String;J)Ljava/util/zip/ZipEntry;
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Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
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An error report file with more information is saved as:
/Users/jeffhsiao/hs_err_pid31954.log
[ timer expired, abort... ]
Abort trap: 6
dhcp-santaclara22-2fl-west-10-132-182-138:~ jeffhsiao$