由jvm加载的类

Question

我有一个正在运行的jvm进程，我想要一个工具来获取由jvm加载的类，是否有一个？

Answer 1

You can use jmap -histo <PID>

It'll show histogram of loaded classes including classname, number of instances, size, etc

Answer 2

jinfo <pid>

will give you quite a bit information, including the classpath and the jars in the path. see here

The jinfo 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 also that jinfo is not available on windows or linux itanium.

Answer 3

You can use the following in the command line

java -verbose:class ....

and the JVM will dump out what it's loading including all its locations

Answer 4

try visual VM. It is free but is not distributed with JRE/JDK but you can download it from official oracle website. Also you can make a heap dump and than you can view it by standard tools from JDK.

Answer 5

如果进程启用了JMX，那么可以使用jvisualvm （与JDK捆绑在一起）来检查这些属性。