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前言上周在线上出现出现报警，ID号码一直无法获取，但是只有这一台机器报警，所以第一时间先在服务治理平台上禁用掉这台机器保证服务正常。停掉机器后要排查问题，思考分析步骤如下:
通过监控发现只有一个key的ID调用发生下降（第一张），这台机器上的其他key没有任何问题，从数据库更新号段正常。是不是数据库死锁了？
这个key在其他机器更新key是正常的，排除数据库的问题，那么就是这台机器的问题
查看log，发现这台机器确实没有更新数据库，两个号段的buffer都是空的。为什么更新数据库失败呢？难道是大量的超时？
仔细检查log日志，发现并没有超时的error。首先没有超时，但是号段是null的，是
...
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背景线上服务有一台机器访问不通（一个管理平台),在公司的服务治理平台上查看服务的状况是正常的，说明进程还在。进程并没有完全crash掉。去线上查看机器日志，发现了大量的OOM异常:
1234567891011121314151617181920212223242526272829303132333435363738017-03-15 00:00:00.041 [WARN] qtp1947699202-120772 nio handle failedjava.lang.OutOfMemoryError: Direct buffer memory at java.nio.Bits.r
...
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<a class="post-title-link" href="/2017/03/31/Java-JDK代理、CGLIB、AspectJ代理分析比较/" itemprop="url">
Java JDK代理、CGLIB、AspectJ代理分析比较
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前言什么是代理,在Design patterns In java这个本书中是这样描述的，简单的说就是为某个对象提供一个代理，以控制对这个对象的访问。在不修改源代码的基础上做方法增强,代理是一种设计模式，又简单的分为两种。
静态代理:代理类和委托类在代码运行前关系就确定了,也就是说在代理类的代码一开始就已经存在了。
动态代理:动态代理类的字节码在程序运行时的时候生成。
静态代理先来看一个静态代理的例子，Calculator是一个计算器的接口类，定义了一个加法的接口方法，由CalculatorImpl类实现真正的加法操作.现在如果我们想对这个方法做一层静态的代理，这儿实现了一个简单的代理类实现
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