JAVA OOM 异常可观测最佳实践

C:\Users\lenovo>java -XX:+PrintFlagsFinal -version |FINDSTR /i ":"     intx CICompilerCount                          := 4                                   {product}    uintx InitialHeapSize                          := 266338304                           {product}    uintx MaxHeapSize                              := 4257218560                          {product}    uintx MaxNewSize                               := 1418723328                          {product}    uintx MinHeapDeltaBytes                        := 524288                              {product}    uintx NewSize                                  := 88604672                            {product}    uintx OldSize                                  := 177733632                           {product}     bool PrintFlagsFinal                          := true                                {product}     bool UseCompressedClassPointers               := true                                {lp64_product}     bool UseCompressedOops                        := true                                {lp64_product}     bool UseLargePagesIndividualAllocation        := false                               {pd product}     bool UseParallelGC                            := true                                {product}java version "1.8.0_101"Java(TM) SE Runtime Environment (build 1.8.0_101-b13)Java HotSpot(TM) 64-Bit Server VM (build 25.101-b13, mixed mode)

root@ruoyi-system-c9c54dbd5-ltcvf:/data/app# root@ruoyi-system-c9c54dbd5-ltcvf:/data/app# java -XX:+PrintCommandLineFlags -version-XX:InitialHeapSize=8388608 -XX:MaxHeapSize=134217728 -XX:+PrintCommandLineFlags -XX:+UseCompressedClassPointers -XX:+UseCompressedOops openjdk version "1.8.0_292"OpenJDK Runtime Environment (build 1.8.0_292-b10)OpenJDK 64-Bit Server VM (build 25.292-b10, mixed mode)root@ruoyi-system-c9c54dbd5-ltcvf:/data/app# 

package com.ruoyi.system.controller;
import com.ruoyi.common.core.domain.system.SysDept;import com.ruoyi.common.core.web.domain.AjaxResult;import org.springframework.cglib.proxy.Enhancer;import org.springframework.cglib.proxy.MethodInterceptor;import org.springframework.cglib.proxy.MethodProxy;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;
import java.lang.reflect.Method;import java.nio.ByteBuffer;import java.util.ArrayList;import java.util.List;import java.util.concurrent.TimeUnit;
/** * @author liurui * @date 2022/4/11 9:28 */@RequestMapping("/exec")@RestControllerpublic class ExceptionController {        @GetMapping("/heapOOM")    public AjaxResult heapOOM() {        List<SysDept> list = new ArrayList<>();        while (true) {            try {                TimeUnit.MILLISECONDS.sleep(1);            } catch (InterruptedException e) {                e.printStackTrace();            }            list.add(new SysDept());        }    }
    @GetMapping("/stackOOM")    public AjaxResult stackOOM() {        while (true) {            Thread thread = new Thread(() -> {                while (true) {                    try {                        TimeUnit.HOURS.sleep(1);                    } catch (InterruptedException e) {                        e.printStackTrace();                    }                }
            });            thread.start();        }    }
    @GetMapping("/directBufferOOM")    public AjaxResult directBufferOOM() {        final int _1M = 1024 * 1024 * 1;        List<ByteBuffer> buffers = new ArrayList<>();        int count = 1;        while (true) {            ByteBuffer byteBuffer = ByteBuffer.allocateDirect(_1M);            buffers.add(byteBuffer);            System.out.println(count++);        }    }
    @GetMapping("/stackOFE")    public AjaxResult StackOFE() {        stackOverFlowErrorMethod();        return AjaxResult.success();    }
    public static void stackOverFlowErrorMethod() {        stackOverFlowErrorMethod();    }
    @GetMapping("/metaspaceOOM")    public AjaxResult metaspaceOOM() {        while (true) {            Enhancer enhancer = new Enhancer();            enhancer.setSuperclass(SysDept.class);            enhancer.setUseCache(false);            enhancer.setCallback(new MethodInterceptor() {                @Override                public Object intercept(Object obj, Method method,                                        Object[] args, MethodProxy proxy) throws Throwable {                    return proxy.invokeSuper(obj, args);                }            });            enhancer.create();        }    }}