how to get remote java class file byte stream at runtime?

Question

I wanna modify remote runtime class file(Already loaded in JVM at remote server).
How many steps should I do? I know some APIs, such as Instrumentation, classfiletransformer, ASM, etc. I can modify a class file loacted at local hard disk, using ASM. I can get all names of current loaded classes in locate JVM， by attach JVM's PID. But, what's the next? Does it need to do socket programming to transfer remote classfile to local machine? And I am confusing about this. Any references or advices. thx for ur consideration.

yogiam · Accepted Answer · 2013-08-22 10:33:31Z

0

Get the file from the remote server, modify it locally and push it back to the remote server. Getting the file from the remote server can be using FTP, HTTP or may be write a small socket server running on the reomte machine and a client on your machine.

About how will the class be reloaded in the JVM(since you said its already loaded), I have no idea :)

answered Aug 22, 2013 at 10:33

yogiam

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3 Comments

Nick Dong Over a year ago

Then how to get bytestream of class file which already loaded into JVM？ I only get there are names now.

yogiam Over a year ago

See this SO question. stackoverflow.com/questions/17321039/…

Nick Dong Over a year ago

http://stackoverflow.com/questions/2737285/is-there-a-way-to-obtain-the-bytecode-for-a-class-at-runtime http://stackoverflow.com/questions/4130903/java-getting-bytecode-of-class-at-runtime-from-within-the-same-jvm

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