记一次内存溢出问题以及解决办法

╰+哭是因爲堅強的太久メ 2022-01-30 01:07 814阅读 0赞

## 记一次内存溢出问题以及解决办法 ##

**故事背景**：以太坊开发，调用rpc节点的API，进行转账操作的时候，内存溢出了。

没错儿，就是如此简洁。让我们直接来到事故现场：

org.springframework.web.util.NestedServletException: Handler dispatch failed; nested exception is java.lang.OutOfMemoryError: Java heap space
            at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1006)
            at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925)
            at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:974)
            at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:877)
            at javax.servlet.http.HttpServlet.service(HttpServlet.java:661)
            at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:851)
            at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
            at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
            at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
            at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
            at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
            at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
            at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)
            at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
            at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
            at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
            at com.wallet.api.filter.MyProxyFilter.doFilter(MyProxyFilter.java:35)
            at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
            at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
            at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
            at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
            at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:493)
            at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
            at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
            at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)
            at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
            at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
            at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:800)
            at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
            at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:806)
            at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498)
            at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
            at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
            at java.lang.Thread.run(Thread.java:748)
    Caused by: java.lang.OutOfMemoryError: Java heap space
            at org.bouncycastle.util.Arrays.clone(Unknown Source)
            at org.bouncycastle.crypto.generators.SCrypt.SMix(Unknown Source)
            at org.bouncycastle.crypto.generators.SCrypt.MFcrypt(Unknown Source)
            at org.bouncycastle.crypto.generators.SCrypt.generate(Unknown Source)
            at org.web3j.crypto.Wallet.generateDerivedScryptKey(Wallet.java:132)
            at org.web3j.crypto.Wallet.decrypt(Wallet.java:198)
            at org.web3j.crypto.WalletUtils.loadCredentials(WalletUtils.java:113)
            at org.web3j.crypto.WalletUtils.loadCredentials(WalletUtils.java:107)
            at com.wallet.trans.EthService.exportPrivateKey(EthService.java:87)
            at com.wallet.trans.impl.EthBlockChainService.tx(EthBlockChainService.java:203)
            at com.wallet.trans.impl.EthBlockChainService.trans(EthBlockChainService.java:103)
            at com.wallet.order.server.impl.ChainOrderServiceImpl.trans(ChainOrderServiceImpl.java:175)
            at com.alibaba.dubbo.common.bytecode.Wrapper7.invokeMethod(Wrapper7.java)
            at com.alibaba.dubbo.rpc.proxy.javassist.JavassistProxyFactory$1.doInvoke(JavassistProxyFactory.java:45)
            at com.alibaba.dubbo.rpc.proxy.AbstractProxyInvoker.invoke(AbstractProxyInvoker.java:71)
            at com.alibaba.dubbo.config.invoker.DelegateProviderMetaDataInvoker.invoke(DelegateProviderMetaDataInvoker.java:48)
            at com.alibaba.dubbo.rpc.protocol.InvokerWrapper.invoke(InvokerWrapper.java:52)
            at com.alibaba.dubbo.rpc.filter.ExceptionFilter.invoke(ExceptionFilter.java:61)
            at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:68)
            at com.alibaba.dubbo.monitor.support.MonitorFilter.invoke(MonitorFilter.java:64)
            at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:68)
            at com.alibaba.dubbo.rpc.filter.TimeoutFilter.invoke(TimeoutFilter.java:41)
            at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:68)
            at com.alibaba.dubbo.rpc.protocol.dubbo.filter.TraceFilter.invoke(TraceFilter.java:77)
            at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:68)
            at com.alibaba.dubbo.rpc.filter.ContextFilter.invoke(ContextFilter.java:60)
            at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:68)
            at com.alibaba.dubbo.rpc.filter.GenericFilter.invoke(GenericFilter.java:131)
            at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:68)
            at com.alibaba.dubbo.rpc.filter.ClassLoaderFilter.invoke(ClassLoaderFilter.java:37)
            at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:68)
            at com.alibaba.dubbo.rpc.filter.EchoFilter.invoke(EchoFilter.java:37)

第一反应就是内存不够用，然后谷歌百度了一大堆

java.lang.OutOfMemoryError: Java heap space

对于以上问题，都是说内存不够。于是让同事修改了一下堆内存大小，也不知道有没有设置成功(说实话，没有实际操作过)。然后重启服务，打开阿里云，输入以下命令：

jstat -gcutil pid time

**简单说明一下：jstat -gcutil 固定写法，pid 表示java程序的id，time 表示每隔多久打印一次gc日志 ，单位是毫秒。**  
结果如下（一）：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyODE1NzU0_size_16_color_FFFFFF_t_70]  
主要看大写字母O这一列，表示的是老年代的内存使用比率，一切正常，但是，当我调用转账方法的时候，就出现了下图（二）：

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyODE1NzU0_size_16_color_FFFFFF_t_70 1]  
很明显，在这**一瞬间**，**老年代内存使用率飙升到100%**，并且一直在**Full GC**，但是这个方法只调用了web3j的 sendFunds() ，所以估计是这个方法需要消耗过大的内存，导致溢出，之前也让同事调大了内存，还是酱紫。可能是他没调好，也可能是其他原因，我们对这方面都没太多经验，尴尬～

甚至找到了有人遇到过和我一模一样的问题，但是没有给出解决办法：  
[欲知详情请点我][Link 1]  
上文大概的意思就是web3j这个包有问题，但是人官方回答说没问题。

**最后，不得不弃用 sendFunds() ， 而改用通过构建原始的交易方式进行转账。**  
终于，不再内存溢出了。

具体eth两种转账方式：[**点我查看**][Link 2]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyODE1NzU0_size_16_color_FFFFFF_t_70]: /images/20220130/c22d9af008594786acda059a4a75a57a.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyODE1NzU0_size_16_color_FFFFFF_t_70 1]: /images/20220130/db819b6b76a94eb8979fe02828fbd95b.png
[Link 1]: https://github.com/web3j/web3j/issues/759
[Link 2]: https://blog.csdn.net/qq_42815754/article/details/90171523