Is there any way to force jvm load a new class?
I write a standalone command line program. This program calls a function which I added to an existing class. the existing class has run run for a while by other processes.
When I run my command line program, it can not find the function I added to the existing class. But I am 100% sure I have overwrote the existing class file with my new copy. It looks like the old class file is still in effect.
How can I instruct the JVM to load my new class file, not using the old one(maybe it is cached in memory, and didn't get refreshed)
Welcome any suggestions. I have run out of idea. (BTW: It is infeasible for me to restart the computer)
Classes are loaded by an object called a ClassLoader which stores all the classes it loads in some kind of internal Map object. If you ask the same ClassLoader for a class it's already loaded it will given you the old one.
The only way to drop a class is to drop the ClassLoader which loaded it and create a new one to load a new version.
What you need to do is to put the class file in question is a directory or jar which isn't on the class path. And make sure that no class file of the same name exists on the classpath (because that will be loaded in preference).
Then you create a java.net.URLClassLoader pointing to the directory or jar (use FIle.toURL() to turn a file into a URL).
Then call loadClass on that to load your class file. Then you'll probably have to call newInstance() on the class object to create an instance.
Of course, if new method signatures are added you'll have to access them using Method objects, since they won't be know about at compile time.
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