how to find memory leaks in java

object, the JVM will throw java.lang.OutOfMemoryError and your program will be dropped. Before throwing the OutOfMemoryError, the JVM tries to use the garbage collector to free up enough space, but when it finds that there is still not enough space, it throws the error. To solve this problem, you need to know the information about your program object, for example, what objects you created, what objects took up a lot of space, and so on. You can use the profiler or the heap parser to handle outo

memory. As soon as the maximum heap memory set by-XMX is reached, if no more memory can be allocated to the new object, the JVM throws java.lang.OutOfMemoryError, and your program is dropped. Before throwing the OutOfMemoryError, the JVM tries to use the garbage collector to free up enough space, but when it finds that there is still not enough space, it throws

How to solve Java Memory leakage Article Source: http://hi.baidu.com/robin300/blog/item/383d2473cdc8ea1c8701b089.html Work backward Since the beginning, we have been focusing on object classes rather than individual objects. We do not know that the hashtable has been leaked. If we can find out how big the hashtable is in the system, we can assume that the largest hashtable has a leak (because it can aggreg

Originally from: Http://blog.csdn.net/rj042/article/details/6871030#commentsJava memory allocation and management is one of the core technologies of Java, before we introduced the Java memory management and memory leaks and

One of the most obvious advantages of AVA is its memory management mechanism. You simply create objects, and the Java garbage collection mechanism is responsible for allocating and freeing memory. However, the situation is not as simple as it seems, because memory leaks ofte

　　Java Memory allocation and management is one of the core technologies of java, before we introduced the Java memory management and memory leaks and

prevent a memory leak. For instances where pointers are still pointing, the JVM does not reclaim the resource because garbage collection will use null-valued objects as garbage, increasing the efficiency of the GC recovery mechanism;e) In our program is inevitably a lot of string processing, avoid using string, should use a large number of StringBuffer, each string object has to occupy an area of memory;g)

Memory management in Java is divided into two areas:Memory allocation: Refers to the memory space allocated by the JVM to the object in the heap space when a Java object is created.Memory reclamation: When a Java object loses its reference and becomes garbage, the garbage co

Java memory leaks There are generally two cases of memory leaks. A situation such as in the C + + language, the allocated memory in the heap, when it is not released, erase all Access to this

java.util.Arrays.copyOf (arrays.java:2760) at java.util.Arrays.copyOf (arrays.java:2734) at Java.util.ArrayList.ensureCapacity (arraylist.java:167) at Java.util.ArrayList.add (arraylist.java:351) At Com.xrq.test.HeapOverflowTest.main (heapoverflowtest.java:18)This anomaly is very common, but also very good to find, because all prompted the "Java heap space", positioning problems, according to the exception stack analysis is good, the l

is related to the operating system, the general 32-bit machine is between 1.5g and 3g, and 64-bit will not be limited.Note: If XMS exceeds the XMX value, or if the sum of the heap maximum and the non-heap maximum exceeds the physical memory or the maximum operating system limit, the server will not start up.Garbage collection GC:The frequency with which the JVM calls the GC is still high, with garbage collection in two main cases:When the application