java 元数据区_Java元数据区域（MetaSpace）OOM

比眉伴天荒 2022-11-03 11:50 191阅读 0赞

元数据区

元数据区取代了1.7版本及以前的永久代。元数据区和永久代本质上都是方法区的实现。方法区存放虚拟机加载的类信息，静态变量，常量等数据。

JVM配置

\-XX:MetaspaceSize=10M

\-XX:MaxMetaspaceSize=10M

\-XX:+HeapDumpOnOutOfMemoryError

测试代码

public classMetaSpaceOOM \{public static voidmain(String\[\] args) \{while (true) \{

Enhancer enhancer=newEnhancer();

enhancer.setSuperclass(OOMObject.class);

enhancer.setUseCache(false);

enhancer.setCallback(newMethodInterceptor() \{

@Overridepublic Object intercept(Object o, Method method, Object\[\] objects, MethodProxy methodProxy) throwsThrowable \{returnmethodProxy.invokeSuper(o,args);

\});

enhancer.create();

\}static classOOMObject \{

运行结果

Dumping heap to java\_pid2776.hprof ...

Heap dump file created \[4179143 bytes in 0.023secs\]

Exception in thread"main"java.lang.OutOfMemoryError:Metaspace

at org.springframework.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:538)

at org.springframework.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:363)

at org.springframework.cglib.proxy.Enhancer.generate(Enhancer.java:582)

at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData.get(AbstractClassGenerator.java:131)

at org.springframework.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:319)

at org.springframework.cglib.proxy.Enhancer.createHelper(Enhancer.java:569)

at org.springframework.cglib.proxy.Enhancer.create(Enhancer.java:384)

at com.example.oom.MetaSpaceOOM.main(MetaSpaceOOM.java:21)

GC LOG

\[GC (Allocation Failure) \[PSYoungGen: 64512K->3311K(75264K)\] 64512K->3327K(247296K), 0.0056889 secs\] \[Times: user=0.00 sys=0.00, real=0.00secs\]

\[GC (Allocation Failure) \[PSYoungGen: 67823K->3272K(75264K)\] 67839K->3296K(247296K), 0.0049203 secs\] \[Times: user=0.00 sys=0.00, real=0.00secs\]

\[GC (Metadata GC Threshold) \[PSYoungGen: 39236K->3816K(75264K)\] 39260K->3848K(247296K), 0.0040988 secs\] \[Times: user=0.00 sys=0.00, real=0.00secs\]

\[Full GC (Metadata GC Threshold) \[PSYoungGen: 3816K->0K(75264K)\] \[ParOldGen: 32K->3694K(98816K)\] 3848K->3694K(174080K), \[Metaspace: 9913K->9913K(1058816K)\], 0.0195453 secs\] \[Times: user=0.03 sys=0.00, real=0.02secs\]

\[GC (Last ditch collection) \[PSYoungGen: 0K->0K(102400K)\] 3694K->3694K(201216K), 0.0006640 secs\] \[Times: user=0.00 sys=0.00, real=0.00secs\]

\[Full GC (Last ditch collection) \[PSYoungGen: 0K->0K(102400K)\] \[ParOldGen: 3694K->2157K(188928K)\] 3694K->2157K(291328K), \[Metaspace: 9913K->9913K(1058816K)\], 0.0355431 secs\] \[Times: user=0.14 sys=0.02, real=0.05secs\]

java.lang.OutOfMemoryError: Metaspace