JDK Tools and Utilities

https://docs.oracle.com/javase/8/docs/technotes/tools/#monitor

• jps
• jinfo
• jmap -heap 3474

主要内容 General
General Information (file structure, classpath, how classes are found, changes)
Enhancements
Standard JDK Tools and Utilities

Basic Tools (appletviewer, extcheck, jar, java, javac, javadoc, javah, javap, jdb, jdeps)
Security Tools (keytool, jarsigner, policytool, kinit, klist, ktab)
Internationalization Tools (native2ascii)
Remote Method Invocation (RMI) Tools (rmic, rmiregistry, rmid, serialver)
Java IDL and RMI-IIOP Tools (tnameserv, idlj, orbd, servertool)
Java Deployment Tools (javapackager, pack200, unpack200)
Java Web Start Tools (javaws)
Java Troubleshooting, Profiling, Monitoring and Management Tools (jcmd, jconsole, jmc, jvisualvm)
Java Web Services Tools (schemagen, wsgen, wsimport, xjc)
Experimental JDK Tools and Utilities

NOTE - The tools described in this section are unsupported and experimental in nature and should be used with that in mind. They might not be available in future JDK versions.

Monitoring Tools (jps, jstat, jstatd)
Troubleshooting Tools (jinfo, jhat, jmap, jsadebugd, jstack)
Scripting Tools (jrunscript)
Troubleshooting Documentation

Java™ SE Troubleshooting web site (tools, options, and other items for use in analyzing problems)