jps的用途是显示当前用户的所有JAVA进程的状态。平时我在公司的linux ,windows下都可以正常使用，今天突然在家用发现没有用了，我明明启动了JAVA APP程序，在命令行敲了jps却没有任何显示，当然也没有报错误。其实就算是没有其他JAVA APP运行，也应该显示本身进程的状态呀。不知道怎么回事，看了JPS的API，还是没有解决，有没有人知道原因。
下边给出官方对JPS的说明：
The jps tool lists the instrumented HotSpot Java Virtual Machines (JVMs) on the target system. The tool is limited to reporting information on JVMs for which it has the access permissions. If jps is run without specifying a hostid, it will look for instrumented JVMs on the local host. If started with a hostid, it will look for JVMs on the indicated host, using the specified protocol and port. A jstatd process is assumed to be running on the target host. The jps command will report the local VM identifier, or lvmid, for each instrumented JVM found on the target system. The lvmid is typically, but not necessarily, the operating system's process identifier for the JVM process. With no options, jps will list each Java application's lvmid followed by the short form of the application's class name or jar file name. The short form of the class name or JAR file name omits the class's package information or the JAR files path information. The jps command uses the java launcher to find the class name and arguments passed to the main method. If the target JVM is started with a custom launcher, the class name (or JAR file name) and the arguments to the main method will not be available. In this case, the jps command will output the string Unknown for the class name or JAR file name and for the arguments to the main method. The list of JVMs produced by the jps command may be limited by the permissions granted to the principal running the command. The command will only list the JVMs for which the principle has access rights as determined by operating system specific access control mechanisms. NOTE: This utility is unsupported and may not be available in future versions of the JDK. It is not currently available on Windows 98 and Windows ME platforms.
下边给出官方对JPS的说明：
The jps tool lists the instrumented HotSpot Java Virtual Machines (JVMs) on the target system. The tool is limited to reporting information on JVMs for which it has the access permissions. If jps is run without specifying a hostid, it will look for instrumented JVMs on the local host. If started with a hostid, it will look for JVMs on the indicated host, using the specified protocol and port. A jstatd process is assumed to be running on the target host. The jps command will report the local VM identifier, or lvmid, for each instrumented JVM found on the target system. The lvmid is typically, but not necessarily, the operating system's process identifier for the JVM process. With no options, jps will list each Java application's lvmid followed by the short form of the application's class name or jar file name. The short form of the class name or JAR file name omits the class's package information or the JAR files path information. The jps command uses the java launcher to find the class name and arguments passed to the main method. If the target JVM is started with a custom launcher, the class name (or JAR file name) and the arguments to the main method will not be available. In this case, the jps command will output the string Unknown for the class name or JAR file name and for the arguments to the main method. The list of JVMs produced by the jps command may be limited by the permissions granted to the principal running the command. The command will only list the JVMs for which the principle has access rights as determined by operating system specific access control mechanisms. NOTE: This utility is unsupported and may not be available in future versions of the JDK. It is not currently available on Windows 98 and Windows ME platforms.
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