1. jps 类似 ps
-q 只显示pid
-v 传给jvm的参数
2. jvisualvm可视化vm状态查看
3. jstack - jvm stack trace
4. jdb 调试工具
linux: java -classpath .;..\lib\xSocket-2.8.15.jar;%classpath% -Xdebug -Xrunjdwp:transport=dt_socket,address=8000,server=y,suspend=n demo.TestServer
jdb -attach 8000
windows:java -classpath .;..\lib\xSocket-2.8.15.jar;%classpath% -Xdebug -Xrunjdwp:transport=dt_shmem,server=y,suspend=n demo.TestServer
jdb -attach javadebug