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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="renderer" content="webkit">
<meta http-equiv="X-UA-Compatible" content="IE=edge" >
<link rel="dns-prefetch" href="http://irusist.github.io">
<title>irusist - 坚持是一种美德</title>
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background: linear-gradient(200deg,#a0cfe4,#e8c37e);
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<a class="article-title" href="/2100/01/01/Github语言排行/">Github语言排行[人工置顶]</a>
</h1>
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<time datetime="2099-12-31T16:00:01.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2100-01-01</time>
</a>
</header>
<div class="article-entry" itemprop="articleBody">
<p>以下内容是通过github api动态生成的, 生成时间: 2016年01月02日22时05分56秒</p>
<a class="article-more-a" href="/2100/01/01/Github语言排行/#more">more >></a>
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<a class="article-more-a" href="/2100/01/01/Github语言排行/">展开全文 >></a>
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<article id="post-Java的一些内存泄露" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<header class="article-header">
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<a class="article-title" href="/2017/11/27/Java的一些内存泄露/">Java的一些内存泄露</a>
</h1>
<a href="/2017/11/27/Java的一些内存泄露/" class="archive-article-date">
<time datetime="2017-11-26T16:00:00.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2017-11-27</time>
</a>
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<p>
最近有个后台项目开发环境报OOM， 最后利用mat分析出具体原因是，在开发环境，开发人员为了方便，用jboss的热部署来部署更新完的war包，重新部署后，会reload spring的容器类，
但是有的类实例不能被卸载，导致有多个实例，之前存在的实例的定时任务一直在执行，最后导致OOM。 于是分析了具体不能被卸载的类，主要有以下2种情况：
</p>
<ul class="org-ul">
<li>存在定时任务没有被停止，造成有活跃的Thread，由于被根对象引用，造成不能被回收
</li>
<li>实例被静态单例的类实例引用，如果要回收这个实例，必须回收Class对象，但是Class对象ClassLoader引用，而ClassLoader不能被回收的话，造成静态实例不能被回收。
</li>
</ul>
<a class="article-more-a" href="/2017/11/27/Java的一些内存泄露/#more">more >></a>
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<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag article-tag-list-link color4">Java mat</a>
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<a href="/categories/Java//" class="article-tag-list-link color5">Java</a>
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<a class="article-more-a" href="/2017/11/27/Java的一些内存泄露/">展开全文 >></a>
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<article id="post-我的投资记录" class="article article-type-post article-index" itemscope itemprop="blogPost">
<div class="article-inner">
<header class="article-header">
<h1 itemprop="name">
<a class="article-title" href="/2017/11/11/我的投资记录/">我的投资记录</a>
</h1>
<a href="/2017/11/11/我的投资记录/" class="archive-article-date">
<time datetime="2017-11-10T16:00:00.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2017-11-11</time>
</a>
</header>
<div class="article-entry" itemprop="articleBody">
<p>
今年6月份开始接触投资，发现一片新的广阔天地，不断学习中，将以后投资的情况记录到这里
</p>
<a class="article-more-a" href="/2017/11/11/我的投资记录/#more">more >></a>
</div>
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<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag article-tag-list-link color3">投资</a>
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</ul>
</div>
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<i class="icon-book icon"></i>
<ul class="article-tag-list">
<li class="article-tag-list-item">
<a href="/categories/投资//" class="article-tag-list-link color3">投资</a>
</li>
</ul>
</div>
<p class="article-more-link">
<a class="article-more-a" href="/2017/11/11/我的投资记录/">展开全文 >></a>
</p>
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</div>
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<article id="post-quant-blog" class="article article-type-post article-index" itemscope itemprop="blogPost">
<div class="article-inner">
<header class="article-header">
<h1 itemprop="name">
<a class="article-title" href="/2017/11/05/quant-blog/">quant_blog</a>
</h1>
<a href="/2017/11/05/quant-blog/" class="archive-article-date">
<time datetime="2017-11-04T16:00:00.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2017-11-05</time>
</a>
</header>
<div class="article-entry" itemprop="articleBody">
<ul class="org-ul">
<li><a href="http://gaoya.blog.163.com/blog/static/602780662009112393655698/" target="_blank" rel="noopener">http://gaoya.blog.163.com/blog/static/602780662009112393655698/</a>
</li>
<li><a href="http://gaoya.blog.163.com/blog/static/60278066200911308183225/" target="_blank" rel="noopener">http://gaoya.blog.163.com/blog/static/60278066200911308183225/</a>
</li>
<li><a href="http://gaoya.blog.163.com/blog/static/60278066201002001849158/" target="_blank" rel="noopener">http://gaoya.blog.163.com/blog/static/60278066201002001849158/</a>
</li>
<li><a href="http://gaoya.blog.163.com/blog/static/602780662010126503294/" target="_blank" rel="noopener">http://gaoya.blog.163.com/blog/static/602780662010126503294/</a>
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<li><a href="http://gaoya.blog.163.com/blog/static/602780662010319375924/" target="_blank" rel="noopener">http://gaoya.blog.163.com/blog/static/602780662010319375924/</a>
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<li><a href="http://gaoya.blog.163.com/blog/static/6027806620104121155906/" target="_blank" rel="noopener">http://gaoya.blog.163.com/blog/static/6027806620104121155906/</a>
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<article id="post-hexo使用org-mode" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<a class="article-title" href="/2017/11/05/hexo使用org-mode/">hexo使用org-mode</a>
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<p>
之前hexo用的一直都是markdown，从今天开始切换到org-mode，以下是安装的一些步骤
</p>
<div id="outline-container-sec-1" class="outline-2">
<h2 id="sec-1">安装</h2>
<div class="outline-text-2" id="text-1">
<div class="org-src-container">
<figure class="highlight bash"><table><tr><td class="code"><pre><span class="line">npm install -g hexo-cli --registry=https://registry.npm.taobao.org --proxy http://<span class="number">127.0</span>.<span class="number">0.1</span>:<span class="number">1080</span></span><br></pre></td></tr></table></figure>
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<ul class="org-ul">
<li>registry指定镜像
</li>
<li>proxy指定代理
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<article id="post-Play的Response处理" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<a class="article-title" href="/2016/01/17/Play的Response处理/">Play的Response处理</a>
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<time datetime="2016-01-17T05:22:54.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2016-01-17</time>
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<p>默认情况下，不需要指定<code>Content-Length</code>这个响应头，Play框架会根据响应内容自动计算出来，如<br><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">normal</span> </span>= <span class="type">Action</span> {</span><br><span class="line"> <span class="type">Ok</span>(<span class="string">"Hello, Response"</span>)</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<p>会自动生成如下的响应头</p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">Content-Length:15</span><br><span class="line">Content-Type:text/plain; charset=utf-8</span><br><span class="line">Date:Sun, 17 Jan 2016 05:26:14 GMT</span><br></pre></td></tr></table></figure>
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<article id="post-ElasticSearch初体验-index的CRUD" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<a class="article-title" href="/2016/01/13/ElasticSearch初体验-index的CRUD/">ElasticSearch初体验:index的CRUD</a>
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<p>最近要使用ElasticSearch, 记录下学习的东西.</p>
<h2 id="安装"><a href="#安装" class="headerlink" title="安装"></a>安装</h2><p>首先要先安装, 要求JDK7以上, 直接获取安装包</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">// 下在安装包</span><br><span class="line">$ curl -L -O https://download.elastic.co/elasticsearch/elasticsearch/elasticsearch-1.7.4.tar.gz</span><br><span class="line">// 解压</span><br><span class="line">$ tar xvf elasticsearch-1.7.4.tar.gz</span><br><span class="line">$ <span class="built_in">cd</span> elasticsearch-1.7.4/bin</span><br><span class="line">// 启动, 集群名为 es-test</span><br><span class="line">$ ./elasticsearch --cluster.name es-test</span><br></pre></td></tr></table></figure>
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<a class="article-title" href="/2016/01/12/Golang之reflect/">Golang之reflect</a>
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<p>在Go语言中，使用<code>reflect</code>包可以对类型信息，类型的值进行获取和设置，分别用<code>Type</code>和<code>Value</code>表示。</p>
<p>可以定义一个类型，并且为类型声明一个方法</p>
<figure class="highlight go"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">type</span> Person <span class="keyword">struct</span> {</span><br><span class="line"> Name <span class="keyword">string</span></span><br><span class="line"> Id <span class="keyword">int32</span></span><br><span class="line"> Age <span class="keyword">int32</span></span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">func</span> <span class="params">(person Person)</span> <span class="title">Eat</span><span class="params">(food <span class="keyword">string</span>)</span></span> {</span><br><span class="line"> fmt.Println(<span class="string">"eat..."</span>, food)</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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<article id="post-Play框架学习之错误处理" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<h1 itemprop="name">
<a class="article-title" href="/2016/01/10/Play框架学习之错误处理/">Play框架学习之错误处理</a>
</h1>
<a href="/2016/01/10/Play框架学习之错误处理/" class="archive-article-date">
<time datetime="2016-01-10T06:07:50.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2016-01-10</time>
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<p>在Play中，分为2种错误：客户端错误和服务端错误。客户端错误包括不规范的请求头数据，不支持的content type，找不到静态页面等等，服务端错误时会返回一个错误的页面。</p>
<h2 id="自定义错误处理"><a href="#自定义错误处理" class="headerlink" title="自定义错误处理"></a>自定义错误处理</h2><p>可以在app目录下创建一个名为<code>ErrorHandler</code>的类，实现<code>HttpErrorHandler</code>，注意，必须没有包名，并且类名必须为<code>ErrorHandler</code>，如</p>
<figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">ErrorHandler</span> <span class="keyword">extends</span> <span class="title">HttpErrorHandler</span> </span>{</span><br><span class="line"> <span class="keyword">override</span> <span class="function"><span class="keyword">def</span> <span class="title">onClientError</span></span>(request: <span class="type">RequestHeader</span>, statusCode: <span class="type">Int</span>, message: <span class="type">String</span>) = {</span><br><span class="line"> <span class="type">Future</span>.successful {</span><br><span class="line"> <span class="type">Status</span>(statusCode)(<span class="string">"A client error occurred: "</span> + message)</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">override</span> <span class="function"><span class="keyword">def</span> <span class="title">onServerError</span></span>(request: <span class="type">RequestHeader</span>, exception: <span class="type">Throwable</span>) = {</span><br><span class="line"> <span class="type">Future</span>.successful {</span><br><span class="line"> <span class="type">InternalServerError</span>(<span class="string">"A server error occurred: "</span> + exception.getMessage)</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">// 在Action实现中直接抛出异常</span></span><br><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">custom</span></span>() = <span class="type">Action</span> { <span class="keyword">implicit</span> request =></span><br><span class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> <span class="type">RuntimeException</span>(<span class="string">"RuntimeException"</span>)</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>访问<a href="http://localhost:9000/custom" target="_blank" rel="noopener">http://localhost:9000/custom</a> 时，会返回“A server error occurred: RuntimeException”文本信息。</p>
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