[Solved] How to reduce memory leak in java?

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lets analyze a few of the the possible error messages:

java.lang.OutOfMemoryError: Java heap space
java.lang.OutOfMemoryError: PermGen space
java.lang.OutOfMemoryError: Requested array size exceeds VM limit
java.lang.OutOfMemoryError: request <size> bytes for <reason>. Out of swap space?
java.lang.OutOfMemoryError: <reason> <stack trace> (Native method)

Here’s the MemLeak class:

package com.post.memory.leak;

import java.util.Map;

public class MemLeak {
    public final String key;

    public MemLeak(String key) {
        this.key =key;
    }

    public static void main(String args[]) {
        try {
            Map map = System.getProperties();

            for(;;) {
                map.put(new MemLeak("key"), "value");
            }
        } catch(Exception e) {
            e.printStackTrace();
        }
    }
}

Note: the memory leak is not due to the infinite loop on line 14: the infinite loop can lead to a resource exhaustion, but not a memory leak. If we had properly implemented equals() and hashcode() methods, the code would run fine even with the infinite loop as we would only have one element inside the HashMap.

solved How to reduce memory leak in java?