2.4 실전:OutOfmory 오류 이상(일부 상황 코드 세그먼트)

/**
 * VM Args：-Xms20m-Xmx20m-XX：+HeapDumpOnOutOfMemoryError
 */
public class HeapOOM {
    static class OOMObject {
    }

    public static void main(String[] args) {
        List list = new ArrayList<>();
        while (true) {
            list.add(new OOMObject());
        }
    }
}

/**
 * VM Args：-Xss128k *@author zzm
 */
public class JavaVMStackSOF {
    private int stackLength = 1;

    public void stackLeak() {
        stackLength++;
        stackLeak();
    }

    public static void main(String[] args) throws Throwable {
        JavaVMStackSOF oom = new JavaVMStackSOF();
        try {
            oom.stackLeak();
        } catch (Throwable e) {
            System.out.println("stack length：" + oom.stackLength);
            throw e;
        }
    }
}

/**
 * VM Args：-Xss2M(         ) *@author zzm
 */
public class JavaVMStackOOM {
    private void dontStop() {
        while (true) {
        }
    }

    public void stackLeakByThread() {
        while (true) {
            Thread thread = new Thread(new Runnable() {
                @Override
                public void run() {
                    dontStop();
                }
            });
            thread.start();
        }
    }

    public static void main(String[] args) throws Throwable {
        JavaVMStackOOM oom = new JavaVMStackOOM();
        oom.stackLeakByThread();
    }
}

/**
*  JDK 1.6       ，             ，      -XX：PermSize -XX：MaxPermSize        ，              
 * VM Args：-XX：PermSize=10M-XX：MaxPermSize=10M
 */
public class RuntimeConstantPoolOOM {
    public static void main(String[] args) {
        //  List        ，  Full GC      
        List list = new ArrayList<>();
        //10MB PermSize integer       OOM 
        int i = 0;
        while (true) {
            list.add(String.valueOf(i++).intern());
        }
    }
}