tools to find memory leaks in java

Recently wrote a database program in Java, found that after a period of time after running a memory overflow. Want to use memory monitoring tool to see where the memory leaks, and then surf the internet and see the Jmap tools.Jmap ToolsJmap prints out all the ' objects ' in

The answer is yes, but I can't answer the interviewer's question with this sentence.Analysis: Java is a garbage collection mechanism, in such a context, memory leaks are also known as "unconscious object hold." If an object reference is left unconscious, the garbage collector not only handles the object, but also does not handle other objects referenced by the ob

networking thread to stop the network request, but I'm not going to do That's here.)So we method added to the Cache are: /** * Remove from the queue all requests with the specified callback. Done when the * result was no longer needed because the view is going away. * @param callback * /public void Removecallback (callback callback) { synchronized (fqueue) { Iterator iter = Fqueue.iterator (); while (Iter.hasnext ()) { Queueit

often used in the development process to replicate objects using the Clone () method. For example, when a function parameter type is a custom class, it is a reference pass instead of a value pass. Here is a small example: Public class A implements Cloneable { Public String name; Public Object Clone () { A o = null; try { o = (A) super.clone (); } catch (Clonenotsupportedexception e) { E.printstacktrace (); } return o; } } A a1=new A ();

1. What is a memory leakWhen some objects are no longer used by the application, but are still referenced, the garbage collector cannot be freed (remove)2. Causes of memory leaksLong-life-cycle objects that hold references to short-life-cycle objects are likely to have a memory leak (old-age reference generation)2.1 When the object property inside the collection