Menu
I'd like to learn how, or if its possible at all to programmaticly interact with a black-box java application(by reading its data). Has there been any previous research/work on doing this sort of thing?
I'd imagine that running on a JVM significantly complicates things.
@anon: Doing this with any JVM is relevant. Do you have to know or control the specifics of how the JVM allocates memory to extract data from a java application?
201
Check the overall memory usage of the appjvisualvm is one of the memory analysis tools for Java used to analyze the runtime behavior of a Java application. It traces a running Java program, checking its memory and CPU consumption. Also, it is used to create a memory heap dump to analyze the objects in the heap.
How to get total Memory in Java. You can use Runtime. getRuntime. totalMemory() to get total memory from JVM which represents the current heap size of JVM which is a combination of used memory currently occupied by objects and free memory available for new objects.
The Runtime#maxMemory method returns the maximum memory that the JVM will attempt to use. Once the JVM memory usage reaches this value, then it will not allocate more memory and instead, and it will garbage collect more frequently.
Typically, the JVM allocates new memory until the heap is full, in which case it garbage collects, freeing up non-referenced objects. If you allocated 14GB for the heap, chances are it will consume that much memory.
You could look into java.lang.instrument. As long as you understand the class structure of the application, it will let you modify the methods in an already-running JVM and you may be able to concoct a way that allows you to extract or insert data enough to communicate (depends on the methods available, of course).
73
The Sable group at McGill University has contributed a lot of research to the Java world.
Much of the work is getting rather dated, but you might find some help in their EVolve project which has the goal of visualizing object-oriented programs. Some of their projects appear to be actively maintained (such as Soot, their Java optimization framework), so you might find luck contacting them directly
21
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
