java -X
-Xmixed mixed mode execution (default)
-Xint interpreted mode execution only
-Xbootclasspath:<directories and zip/jar files separated by :>
set search path for bootstrap classes and resources
-Xbootclasspath/a:<directories and zip/jar files separated by :>
append to end of bootstrap class path
-Xbootclasspath/p:<directories and zip/jar files separated by :>
prepend in front of bootstrap class path
-Xnoclassgc disable class garbage collection
-Xincgc enable incremental garbage collection
-Xloggc:<file> log GC status to a file with time stamps
-Xbatch disable background compilation
-Xms<size> set initial Java heap size
-Xmx<size> set maximum Java heap size
-Xss<size> set java thread stack size
-Xprof output cpu profiling data
-Xfuture enable strictest checks, anticipating future default
-Xrs reduce use of OS signals by Java/VM (see documentation)
-Xcheck:jni perform additional checks for JNI functions
-Xshare:off do not attempt to use shared class data
-Xshare:auto use shared class data if possible (default)
-Xshare:on require using shared class data, otherwise fail.

谢谢楼上的补充！

JDK1.4.2好像是有问题。

那我赶紧换到1.5去。

抱歉，我现在也不用myeclipse，也是因为速度太慢，wtp还不错。感觉0.7比1.0版本好。不过myeclipse4.1的js调试功能真是吸引人！

对于Hibernate你设置成：<generator class="native"/>，对于MySQL数据库默认就是increment的。

我把以前的代码发上来，提供大家下载，大家可以参考。
http://www.xiebing.com/mydb_src.zip

楼上说了极是！谢了。