public class PerGenTest { public static void main(String[] args) { ArrayList<TestClass> list = new ArrayList<TestClass>(); String i = ""; while(true){ i = i + "a"; TestClass test = new TestClass(); test.setName(i); list.add(test); } } }
引用类
public class TestClass { private static String staticName = ""; private long a; public void setName(String name){ a = 100l; staticName = name; } }
设置JVM启动参数(较小的Heap,较大的Meta(PerGen)):
-Xms1m -Xmx1m -XX:MaxMetaspaceSize=5M -XX:+HeapDumpOnOutOfMemoryError
结果:
引用
java.lang.OutOfMemoryError: Java heap space
Dumping heap to java_pid9948.hprof ...
Heap dump file created [1834150 bytes in 0.023 secs]
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
at java.util.Arrays.copyOf(Arrays.java:3210)
at java.util.Arrays.copyOf(Arrays.java:3181)
at java.util.ArrayList.grow(ArrayList.java:261)
at java.util.ArrayList.ensureExplicitCapacity(ArrayList.java:235)
at java.util.ArrayList.ensureCapacityInternal(ArrayList.java:227)
at java.util.ArrayList.add(ArrayList.java:458)
at OutMemoryTest.PerGenTest.main(PerGenTest.java:15)
Dumping heap to java_pid9948.hprof ...
Heap dump file created [1834150 bytes in 0.023 secs]
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
at java.util.Arrays.copyOf(Arrays.java:3210)
at java.util.Arrays.copyOf(Arrays.java:3181)
at java.util.ArrayList.grow(ArrayList.java:261)
at java.util.ArrayList.ensureExplicitCapacity(ArrayList.java:235)
at java.util.ArrayList.ensureCapacityInternal(ArrayList.java:227)
at java.util.ArrayList.add(ArrayList.java:458)
at OutMemoryTest.PerGenTest.main(PerGenTest.java:15)
设置JVM启动参数(较大的Heap,较小的Meta(PerGen)):
-Xms1m -Xmx1m -XX:MaxMetaspaceSize=5M -XX:+HeapDumpOnOutOfMemoryError
java.lang.OutOfMemoryError: Metaspace Dumping heap to java_pid12916.hprof ... Error occurred during initialization of VM GC triggered before VM initialization completed. Try increasing NewSize, current value 2048K.