import java.util.ArrayList;
import java.util.List;

public class TEST1 {
  static class OOMObject{
  }
  public static void main(String[] args) {
    List<OOMObject> list = new ArrayList<OOMObject>();
    while(true){
      list.add(new OOMObject());
    }
  }
}

Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
  at java.util.Arrays.copyOf(Unknown Source)
  at java.util.Arrays.copyOf(Unknown Source)
  at java.util.ArrayList.grow(Unknown Source)
  at java.util.ArrayList.ensureExplicitCapacity(Unknown Source)
  at java.util.ArrayList.ensureCapacityInternal(Unknown Source)
  at java.util.ArrayList.add(Unknown Source)
  at com.ws.TEST1.main(TEST1.java:13)

public class TEST2 {
  private int stackLength = 1;
  public void stackLeak() {
    stackLength++;
    stackLeak();
  }
  public static void main(String[] args) {
    TEST2 oom = new TEST2();
    try {
      oom.stackLeak();
    } catch (Throwable e) {
      System.out.println("stack length:" + oom.stackLength);
      throw e;
    }
  }
}

stack length:7585
Exception in thread "main" java.lang.StackOverflowError
  at com.ws.TEST2.stackLeak(TEST2.java:8)
  at com.ws.TEST2.stackLeak(TEST2.java:8)
  at com.ws.TEST2.stackLeak(TEST2.java:8)
  at com.ws.TEST2.stackLeak(TEST2.java:8)
  at com.ws.TEST2.stackLeak(TEST2.java:8)
  at com.ws.TEST2.stackLeak(TEST2.java:8)
  at com.ws.TEST2.stackLeak(TEST2.java:8)
  at com.ws.TEST2.stackLeak(TEST2.java:8)
  at com.ws.TEST2.stackLeak(TEST2.java:8)
  at com.ws.TEST2.stackLeak(TEST2.java:8)
......