how to find memory leaks in java

JVM will throw java if no more memory can be allocated to new objects. lang. outofmemoryerror: Your program will be replaced. Before throwing an OutOfMemoryError, JVM will try to use the Garbage Collector to free up enough space, but this error will be thrown when it finds that there is still not enough space. To solve this problem, you need to know the information of your program objects, such as the obje

转载自http://www.open-open.com/lib/view/open1415453057980.html 1, Java Memory management is the allocation and release of objects allocation : The allocation of memory is done by the program, and the programmer needs to request the memory space for each object with the keyword new (except for the base type), and all obj

is often not up to the limit. Several reasons may cause the JVM to native memory leaks. For example, the JVM is running too many threads to be created and running at the same time. The JVM allocates resources for threads that may deplete the capacity of native memory.the memory that the JVM manages. Program CounterThis is a small amount of

J9, etc.) there is no concept of a permanent generation. Even the hotspot virtual machine itself, according to the official route map information, now also has to abandon the permanent generation and "move" to native Memory to achieve the planning of the method area.The Java Virtual Machine specification has a very loose limit on this area, and you can choose not to implement garbage collection, except tha

. lang. outofmemoryerror: Your program will be replaced. Before throwing an outofmemoryerror, JVM will try to use the Garbage Collector to free up enough space, but this error will be thrown when it finds that there is still not enough space. To solve this problem, you need to know the information of your program objects, such as the objects you have created and the space occupied by these objects. You can use profiler or heap analyzer to handle outofmemoryerror ."

pool technology to improve the system performance; objects with long life cycles are prone to memory leaks when they have short life-cycle objects, such as when large collection objects have large data volumes of business objects, consider chunking and then resolve a piece of policy that frees a piece. 6. Do not create objects in frequently invoked methods, especially when creating objects in loops. You ca

Yes. The reason Java causes memory leaks is clear: a long lifecycle object holds a reference to a short lifecycle object and is likely to have a memory leak, although the short lifecycle object is no longer needed, but because the long lifecycle object holds its reference and cannot be reclaimed, this is the scenario w

(); System.out.println ("Out Begin gc!"); for(inti=0;i) {System.GC (); System.in.read (); System.in.read (); } } Private Static voidGctest ()throwsIOException {System.in.read (); System.in.read (); Person P1=NewPerson (); System.in.read (); System.in.read (); Person P2=NewPerson (); P1.setmate (p2); P2.setmate (p1); System.out.println ("Before Exit gctest!"); System.in.read (); System.in.read (); System.GC (); Syst

Reprint please indicate source: http://www.cnblogs.com/lighten/p/5971424.html1. PrefaceJava because of the automatic memory management mechanism, so developers generally do not need to worry about memory leaks and other issues. However, this does not mean that memory problems do not occur, because the lack of attention

exceptions, reducing unnecessary object creation while avoiding memory leaks. Now take a real example to analyze the troubleshooting of memory footprint. The top command found that a Java process with a PID of 9004 had been consuming a higher memory release (24.7%) and a h

Java Memory leakage analysis Source: http://hi.baidu.com/robin300/blog/item/8fcf4b347d13694e251f148e.html A major advantage of Java compared with C ++ is that Java can automatically manage memory collection, which greatly reduces the burden on programmers. However,

In C + +, programmers have ownership of each object, but at the same time shoulder the responsibility of releasing the object's memory space, while Java has the help of a virtual machine, the programmer has ownership of the object and no longer need to free the object's memory space. Because the JVM automatically frees up object

references are not disconnected, do not meet the GC conditions, resulting in not being recycled, which caused a memory leak. For example, a broadcast receiver is registered in an activity, but a memory overflow occurs when the page is unregister when it is closed. If our Java has been running for a long time, and this memory