环境：OS X EI Capitan 10.11.3 + JBoss EAP 6.4.0
1. 为了能够看到类的加载路径，修改 standalone.conf，增加 -verbose:class 参数
JAVA_OPTS="-Xms1303m -Xmx1303m -XX:MaxPermSize=256m -Djava.net.preferIPv4Stack=true -verbose:class"
2. 修改 index.jsp，修改后内容如下：
<html>
<head>
<title>JBoss Module Testing
</title>
</head>
<body>
<%
org.apache.http.impl.client.DefaultHttpClient client = new org.apache.http.impl.client.DefaultHttpClient();
System.out.println("### The class of " + client + " is " + client.getClass().getName());
System.out.println("### Its classloader is " + client.getClass().getClassLoader());
out.println("### The class of " + client + " is " + client.getClass().getName());
out.println("### Its classloader is " + client.getClass().getClassLoader());
%>
Hi Check the Console/Log of your JBoss
</body>
</html>
3. 有两种方式可以加载定制的org.apache.httpcomponents module
3.1. 方式一：以 module 的方式增加
（1）修改 jboss-deployment-structure.xml，修改后内容如下：
<?xml version="1.0" encoding="UTF-8"?>
<jboss-deployment-structure>
<deployment>
<exclusions>
<module name="org.apache.httpcomponents" />
</exclusions>
<dependencies>
<module name="org.apache.httpcomponents" slot="4.4.1"/>
</dependencies>
</deployment>
</jboss-deployment-structure>
（2）在 EAP_HOME/modules/system/layers/base/org/apache/httpcomponents/ 目录下创建 4.4.1 目录，并把 httpclient-4.4.1.jar 和 httpcore-4.4.1.jar 复制到该目录下。
创建一个 module.xml 文件，内容如下：
<module xmlns="urn:jboss:module:1.1" name="org.apache.httpcomponents" slot="4.4.1">
<properties>
<property name="jboss.api" value="private"/>
</properties>
<resources>
<resource-root path="httpclient-4.4.1.jar"/>
<resource-root path="httpcore-4.4.1.jar"/>
<resource-root path="httpmime-4.3.6.redhat-1.jar"/>
<!-- Insert resources here -->
</resources>
<dependencies>
<module name="javax.api"/>
<module name="org.apache.commons.codec"/>
<module name="org.apache.commons.logging"/>
<module name="org.apache.james.mime4j"/>
</dependencies>
</module>
（3）重新打包部署
cd /Users/maping/mygit/CustomModuleTest/my-webapp
mvn clean package
（4）访问 http://localhost:8080/my-webapp/index.jsp
在 Console 中会看到如下输出：
[Loaded org.apache.http.client.HttpClient from jar:file:/Users/maping/Redhat/eap/jboss-eap-6.4/modules/system/layers/base/org/apache/httpcomponents/4.4.1/httpclient-4.4.1.jar!/]
[Loaded org.apache.http.impl.client.CloseableHttpClient from jar:file:/Users/maping/Redhat/eap/jboss-eap-6.4/modules/system/layers/base/org/apache/httpcomponents/4.4.1/httpclient-4.4.1.jar!/]
[Loaded org.apache.http.impl.client.AbstractHttpClient from jar:file:/Users/maping/Redhat/eap/jboss-eap-6.4/modules/system/layers/base/org/apache/httpcomponents/4.4.1/httpclient-4.4.1.jar!/]
[Loaded org.apache.http.impl.client.DefaultHttpClient from jar:file:/Users/maping/Redhat/eap/jboss-eap-6.4/modules/system/layers/base/org/apache/httpcomponents/4.4.1/httpclient-4.4.1.jar!/]
说明是从 EAP_HOME/modules/system/layers/base/org/apache/httpcomponents/4.4.1/httpclient-4.4.1.jar 加载到 org.apache.http.client.HttpClient 等类的。
3.2. 方式二：直接添加在 WEB-INF/lib 目录下
（1）修改 jboss-deployment-structure.xml，修改后内容如下：
<?xml version="1.0" encoding="UTF-8"?>
<jboss-deployment-structure>
<deployment>
<exclusions>
<module name="org.apache.httpcomponents" />
</exclusions>
</deployment>
</jboss-deployment-structure>
（2）在 WEB-INF 目录下增加 lib 目录，并把 httpclient-4.4.1.jar 和 httpcore-4.4.1.jar 复制到该目录下。
（3）重新打包部署
cd /Users/maping/mygit/CustomModuleTest/my-webapp
mvn clean package
（4）访问 http://localhost:8080/my-webapp/index.jsp
在 Console 中会看到如下输出：
[Loaded org.apache.http.client.HttpClient from vfs:/content/my-webapp.war/WEB-INF/lib/httpclient-4.4.1.jar]
[Loaded org.apache.http.impl.client.CloseableHttpClient from vfs:/content/my-webapp.war/WEB-INF/lib/httpclient-4.4.1.jar]
[Loaded org.apache.http.impl.client.AbstractHttpClient from vfs:/content/my-webapp.war/WEB-INF/lib/httpclient-4.4.1.jar]
[Loaded org.apache.http.impl.client.DefaultHttpClient from vfs:/content/my-webapp.war/WEB-INF/lib/httpclient-4.4.1.jar]
[Loaded org.apache.http.client.ClientProtocolException from vfs:/content/my-webapp.war/WEB-INF/lib/httpclient-4.4.1.jar]
说明是从 WEB-INF/lib/httpclient-4.4.1.jar 加载到 org.apache.http.client.HttpClient 等类的。
