Java developers

     [java] 2011-03-07 08:57:04.693 java[399] CFLog (0): CFMessagePort: bootstrap_register(): failed 1103 (0x44f), port = 0xf803, name = 'java.ServiceProvider'
     [java] See /usr/include/servers/bootstrap_defs.h for the error codes.
     [java] 2011-03-07 08:57:04.694 java[399] CFLog (99): CFMessagePortCreateLocal(): failed to name Mach port (java.ServiceProvider)

Sometimes I get that in build output on my Mac. The file it says I should see doesn't help. It turns out that it means "You are compiling while another Java process is running".