1    -Xmixed           mixed mode execution (default)
2    -Xint             interpreted mode execution only
3    -Xbootclasspath:<directories and zip/jar files separated by :>
4                      set search path for bootstrap classes and resources
5    -Xbootclasspath/a:<directories and zip/jar files separated by :>
6                      append to end of bootstrap class path
7    -Xbootclasspath/p:<directories and zip/jar files separated by :>
8                      prepend in front of bootstrap class path
9    -Xnoclassgc       disable class garbage collection
10    -Xincgc           enable incremental garbage collection
11    -Xloggc:<file>    log GC status to a file with time stamps
12    -Xbatch           disable background compilation
13    -Xms<size>        set initial Java heap size
14    -Xmx<size>        set maximum Java heap size
15    -Xss<size>        set java thread stack size
16    -Xprof            output cpu profiling data
17    -Xfuture          enable strictest checks, anticipating future default
18    -Xrs              reduce use of OS signals by Java/VM (see documentation)
19    -Xcheck:jni       perform additional checks for JNI functions
20    -Xshare:off	      do not attempt to use shared class data
21    -Xshare:auto      use shared class data if possible (default)
22    -Xshare:on	      require using shared class data, otherwise fail.
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24The -X options are non-standard and subject to change without notice.
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