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</pre>127.0.0.1:9200<br>URL: http://192.168.101.128/searchcore/index.php/cihere_cn_db/_search<br>REQUEST:<pre>Array
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                        <h1 class="page-title"><a href="/show-69987.html" title="《深入理解Java虚拟机》- JVM异常处理">《深入理解Java虚拟机》- JVM异常处理</a></h1>
            
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            <footer class="tc"> chenscript 
                <time class="post-date" datetime="2019-08-21">2019-08-21</time>
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            <div class="postBody">
                
<div id="likecs_post_body" class="blogpost-body ">
    <p>一、Java异常</p>
<p>在程序中，错误可能产生于程序员没有预料到的各种情况，或者超出程序员可控范围的环境，例如用户的坏数据、试图打开一个不存在的文件等。为了能够及时有效地处理程序中的运行错误，Java 专门引入了异常类。</p>
<p>二、Java常见异常分类</p>
<p><img src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTlwYldjeU1ERTRMbU51WW14dlozTXVZMjl0TDJKc2IyY3ZNVFkxTXpNek55OHlNREU1TURndk1UWTFNek16TnkweU1ERTVNRGd5TVRJeU1Ea3lOekV3TUMweU1UUXhORE00TmpZNExtcHdadz09" alt="" width="607" height="337"></p>
<p>三、为什么产生异常</p>
<p>在 Java 中一个异常的产生，主要有如下三种原因：</p>
<ol>
<li>Java 内部错误发生异常，Java 虚拟机产生的异常。</li>
<li>编写的程序代码中的错误所产生的异常，例如空指针异常、数组越界异常等。这种异常称为未检査的异常，一般需要在某些类中集中处理这些异常。</li>
<li>通过 throw 语句手动生成的异常，这种异常称为检査的异常，一般用来告知该方法的调用者一些必要的信息。</li>
</ol>
<p>四、碰到异常怎么办？</p>
<p>我们把生成异常对象，并把它提交给运行时系统的过程称为拋出（throw）异常。运行时系统在方法的调用栈中查找，直到找到能够处理该类型异常的对象，这一个过程称为捕获（catch）异常。</p>
<p>Java 异常强制用户考虑程序的强健性和安全性。异常处理不应用来控制程序的正常流程，其主要作用是捕获程序在运行时发生的异常并进行相应处理。编写代码处理某个方法可能出现的异常，可遵循如下三个原则：</p>
<ol>
<li>在当前方法声明中使用 try catch 语句捕获异常。</li>
<li>一个方法被覆盖时，覆盖它的方法必须拋出相同的异常或异常的子类。</li>
<li>如果父类抛出多个异常，则覆盖方法必须拋出那些异常的一个子集，而不能拋出新异常。</li>
</ol>
<p>（引用：http://c.biancheng.net/view/1038.html）</p>
<p>五、从JVM角度看异常的产生与表达</p>
<p> 先看示例代码：</p>
<div class="likecs_code">
<pre><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">class</span><span style="color: #000000;"> Foo {
  </span><span style="color: #0000ff;">private</span> <span style="color: #0000ff;">int</span><span style="color: #000000;"> tryBlock;
  </span><span style="color: #0000ff;">private</span> <span style="color: #0000ff;">int</span><span style="color: #000000;"> catchBlock;
  </span><span style="color: #0000ff;">private</span> <span style="color: #0000ff;">int</span><span style="color: #000000;"> finallyBlock;
  </span><span style="color: #0000ff;">private</span> <span style="color: #0000ff;">int</span><span style="color: #000000;"> methodExit;


  </span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> test() {
    </span><span style="color: #0000ff;">try</span><span style="color: #000000;"> {
      tryBlock </span>= 0<span style="color: #000000;">;
    } </span><span style="color: #0000ff;">catch</span><span style="color: #000000;"> (Exception e) {
      catchBlock </span>= 1<span style="color: #000000;">;
    } </span><span style="color: #0000ff;">finally</span><span style="color: #000000;"> {
      finallyBlock </span>= 2<span style="color: #000000;">;
    }
    methodExit </span>= 3<span style="color: #000000;">;
  }
}</span></pre>
</div>
<p>这段代码是一段简单的异常处理代码，我们可以通过javap查看class文件的表达形式：</p>
<div class="likecs_code">
<pre><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> test();
    descriptor: ()V
    flags: ACC_PUBLIC
    Code:
      stack</span>=2, locals=3, args_size=1
         0<span style="color: #000000;">: aload_0
         </span>1<span style="color: #000000;">: iconst_0
         </span>2: putfield      #2                  <span style="color: #008000;">//</span><span style="color: #008000;"> Field tryBlock:I</span>
         5<span style="color: #000000;">: aload_0
         </span>6<span style="color: #000000;">: iconst_2
         </span>7: putfield      #3                  <span style="color: #008000;">//</span><span style="color: #008000;"> Field finallyBlock:I</span>
        10: <span style="color: #0000ff;">goto</span>          35
        13<span style="color: #000000;">: astore_1
        </span>14<span style="color: #000000;">: aload_0
        </span>15<span style="color: #000000;">: iconst_1
        </span>16: putfield      #5                  <span style="color: #008000;">//</span><span style="color: #008000;"> Field catchBlock:I</span>
        19<span style="color: #000000;">: aload_0
        </span>20<span style="color: #000000;">: iconst_2
        </span>21: putfield      #3                  <span style="color: #008000;">//</span><span style="color: #008000;"> Field finallyBlock:I</span>
        24: <span style="color: #0000ff;">goto</span>          35
        27<span style="color: #000000;">: astore_2
        </span>28<span style="color: #000000;">: aload_0
        </span>29<span style="color: #000000;">: iconst_2
        </span>30: putfield      #3                  <span style="color: #008000;">//</span><span style="color: #008000;"> Field finallyBlock:I</span>
        33<span style="color: #000000;">: aload_2
        </span>34<span style="color: #000000;">: athrow
        </span>35<span style="color: #000000;">: aload_0
        </span>36<span style="color: #000000;">: iconst_3
        </span>37: putfield      #6                  <span style="color: #008000;">//</span><span style="color: #008000;"> Field methodExit:I</span>
        40: <span style="color: #0000ff;">return</span><span style="background-color: #ffff00;"><span style="color: #000000;">
      Exception table:
         from    to  target type
             </span>0     5    13   Class java/lang/<span style="color: #000000;">Exception
             </span>0     5    27<span style="color: #000000;">   any
            </span>13    19    27</span><span style="color: #000000;"><span style="background-color: #ffff00;">   any</span>
      LineNumberTable:
        line </span>10: 0<span style="color: #000000;">
        line </span>14: 5<span style="color: #000000;">
        line </span>15: 10<span style="color: #000000;">
        line </span>11: 13<span style="color: #000000;">
        line </span>12: 14<span style="color: #000000;">
        line </span>14: 19<span style="color: #000000;">
        line </span>15: 24<span style="color: #000000;">
        line </span>14: 27<span style="color: #000000;">
        line </span>16: 35<span style="color: #000000;">
        line </span>17: 40<span style="color: #000000;">
      StackMapTable: number_of_entries </span>= 3<span style="color: #000000;">
        frame_type </span>= 77 <span style="color: #008000;">/*</span><span style="color: #008000;"> same_locals_1_stack_item </span><span style="color: #008000;">*/</span><span style="color: #000000;">
          stack </span>= [ <span style="color: #0000ff;">class</span> java/lang/<span style="color: #000000;">Exception ]
        frame_type </span>= 77 <span style="color: #008000;">/*</span><span style="color: #008000;"> same_locals_1_stack_item </span><span style="color: #008000;">*/</span><span style="color: #000000;">
          stack </span>= [ <span style="color: #0000ff;">class</span> java/lang/<span style="color: #000000;">Throwable ]
        frame_type </span>= 7 <span style="color: #008000;">/*</span><span style="color: #008000;"> same </span><span style="color: #008000;">*/</span></pre>
</div>
<p>从字节码中的注释可以看到，finally块被添加到了三个地方。也就是说，在从java代码翻译成字节码文件时，jvm会为try块和catch块生成finally 块里的逻辑。但是想想，为什么是三个“finally”呢？ 最后一个finally 是为在catch块中的代码执行时发生异常而准备的。那么，有人会问,finally块的代码如果还有报错怎么办呢？ 这里，引进没有被本人证实的事实：会往外抛出去，给上一层代码进行处理。</p>
<p>这里说明一下黄色部分的字节码：</p>
<blockquote>
<p>exception table 表示异常表，异常表是用于存储代码中涉及到的所有异常，每个类编译后，都会跟随一个异常表，如果发生异常，首先在异常表中查找对应的行（即代码中相应的 <code>try{}catch(){}</code>代码块），如果找到，则跳转到异常处理代码执行，如果没有找到，则返回（执行 finally 之后），并 copy 异常的应用给父调用者，接着查询父调用的异常表，以此类推。</p>
<p>from...to：表示异常处理器监控的范围（比如try块包含的代码）</p>
<p>target：表示异常处理器起始的位置（比如catch块包含的代码）</p>
<p>type：就是处理的异常</p>
</blockquote>
<p><strong>那么，发生异常后，如何对照异常表？</strong></p>
<blockquote>
<p>当程序触发异常后，Java虚拟机会从上到下遍历异常表中的条目。当触发异常的字节码的索引值在某个异常表条目的监控范围内，Java虚拟机会判断所抛出的异常和该条目想要捕获的异常是否匹配。如果匹配，Java虚拟机会将控制流转移到该条目的target指针指向的代码上，继续程序运行。</p>
</blockquote>
<p>下面，提及的字节码解析一下异常表：</p>
<blockquote>
<p>程序开始，运行到1：iconst_0时，发生Exception异常，此时程序会去便利方法表，从第一行开始，检测到 0&lt;1&lt;5，符合第一条目检测范围，接着再查看抛出的异常为Exception，符合该条目捕获处理的异常，后跳转至序号13字节码继续运行。若再在14：aload_0发生异常时，程序就又跳到异常表，查找匹配异常条目，最终找到target为序号为27的字节码，然后便一直往下走完所有字节码。</p>
</blockquote>
<p>上例子中，属于在catch块发生异常，所以会看到字节码后还有一个athrow的步骤，也就是往外抛出异常啦。</p>
<p> </p>
<p>好了，Jvm看异常到此。</p>
<p>（引：极客时间）</p>
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