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[经验分享] Jetty 类加载器体系结构

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发表于 2017-2-27 07:35:36 | 显示全部楼层 |阅读模式
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一般类加载器分三类:引导类加载器、扩展类加载器、系统类加载器
请见这里的分析http://blog.csdn.net/lovingprince/archive/2009/07/02/4317069.aspx

请记住类加载器的几个特点:
1、 双亲委托
2、 全局负责

Jetty的jetty_home/lib下包含了jetty服务器运行所需要的jar包,而jetty_home/lib/ext下包含的服务器使用的一些扩展包,运行在webapps下特定应用的WEB-INF/lib和WEB-INF/classess是各个应用自己的使用的类,特定应用自己的类当然不能与其他应用分享。
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SemiHidden="false"UnhideWhenUsed="false" Name="Medium List 1 Accent 1"/><w:LsdException Locked="false" UnhideWhenUsed="false" Name="Revision"/><w:LsdException Locked="false" Priority="34" SemiHidden="false"UnhideWhenUsed="false" QFormat="true" Name="List Paragraph"/><w:LsdException Locked="false" Priority="29" SemiHidden="false"UnhideWhenUsed="false" QFormat="true" Name="Quote"/><w:LsdException Locked="false" Priority="30" SemiHidden="false"UnhideWhenUsed="false" QFormat="true" Name="Intense Quote"/><w:LsdException Locked="false" Priority="66" SemiHidden="false"UnhideWhenUsed="false" Name="Medium List 2 Accent 1"/><w:LsdException Locked="false" Priority="67" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 1 Accent 1"/><w:LsdException Locked="false" Priority="68" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 2 Accent 1"/><w:LsdException Locked="false" Priority="69" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 3 Accent 1"/><w:LsdException Locked="false" Priority="70" SemiHidden="false"UnhideWhenUsed="false" Name="Dark List Accent 1"/><w:LsdException Locked="false" Priority="71" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful Shading Accent 1"/><w:LsdException Locked="false" Priority="72" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful List Accent 1"/><w:LsdException Locked="false" Priority="73" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful Grid Accent 1"/><w:LsdException Locked="false" Priority="60" SemiHidden="false"UnhideWhenUsed="false" Name="Light Shading Accent 2"/><w:LsdException Locked="false" Priority="61" SemiHidden="false"UnhideWhenUsed="false" Name="Light List Accent 2"/><w:LsdException Locked="false" Priority="62" SemiHidden="false"UnhideWhenUsed="false" Name="Light Grid Accent 2"/><w:LsdException Locked="false" Priority="63" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Shading 1 Accent 2"/><w:LsdException Locked="false" Priority="64" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Shading 2 Accent 2"/><w:LsdException Locked="false" Priority="65" SemiHidden="false"UnhideWhenUsed="false" Name="Medium List 1 Accent 2"/><w:LsdException Locked="false" Priority="66" SemiHidden="false"UnhideWhenUsed="false" Name="Medium List 2 Accent 2"/><w:LsdException Locked="false" Priority="67" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 1 Accent 2"/><w:LsdException Locked="false" Priority="68" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 2 Accent 2"/><w:LsdException Locked="false" Priority="69" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 3 Accent 2"/><w:LsdException Locked="false" Priority="70" SemiHidden="false"UnhideWhenUsed="false" Name="Dark List Accent 2"/><w:LsdException Locked="false" Priority="71" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful Shading Accent 2"/><w:LsdException Locked="false" Priority="72" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful List Accent 2"/><w:LsdException Locked="false" Priority="73" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful Grid Accent 2"/><w:LsdException Locked="false" Priority="60" SemiHidden="false"UnhideWhenUsed="false" Name="Light Shading Accent 3"/><w:LsdException Locked="false" Priority="61" SemiHidden="false"UnhideWhenUsed="false" Name="Light List Accent 3"/><w:LsdException Locked="false" Priority="62" SemiHidden="false"UnhideWhenUsed="false" Name="Light Grid Accent 3"/><w:LsdException Locked="false" Priority="63" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Shading 1 Accent 3"/><w:LsdException Locked="false" Priority="64" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Shading 2 Accent 3"/><w:LsdException Locked="false" Priority="65" SemiHidden="false"UnhideWhenUsed="false" Name="Medium List 1 Accent 3"/><w:LsdException Locked="false" Priority="66" SemiHidden="false"UnhideWhenUsed="false" Name="Medium List 2 Accent 3"/><w:LsdException Locked="false" Priority="67" 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  • 系统类加载器
Jetty 启动方式 java -jar start.jar(内部实际执行org.eclipse.jetty.start.Main类)
那么这个org.eclipse.jetty.start.Main是由哪个加载器加载的呢?很明显,这里没有其他的自定义类加载器,只有系统类加载器能够做这个工作。


  • 系统自定义加载器
Jetty自定义了一个的Loader 类加载器,以系统类加载器做为父加载器,完成对start.config配置文件的读取(注意,这里只是读取,并没有实例化里面的类,只是使用类加载器来确定里面的class是否可用)
接下来,Jetty有两种运行方式,一种进程内运行(通过反射执行MainClass),一种是进程外执行(通过Runtime.getRuntime().exec()),进程外执行时由于线程上下文不能进程之间传递,因此相当于我们直接使用如下方式直接执行:
Java -Xms1636m -Xmx1636m -XX:PermSize=196m -cp /home/admin/jetty/lib/jetty-xml-7.1.6.v20100715.jar:/home/admin/jetty/lib/servlet-api-2.5.jar:/home/admin/jetty/lib/jetty-http-7.1.6.v20100715.jar:/home/admin/jetty/lib/jetty-continuation-7.1.6.v20100715.jar:/home/admin/jetty/lib/jetty-server-7.1.6.v20100715.jar:/home/admin/jetty/lib/jetty-security-7.1.6.v20100715.jar:/home/admin/jetty/lib/jetty-servlet-7.1.6.v20100715.jar:/home/admin/jetty/lib/jetty-webapp-7.1.6.v20100715.jar:/home/admin/jetty/lib/jetty-deploy-7.1.6.v20100715.jar:/home/admin/jetty/lib/jetty-servlets-7.1.6.v20100715.jar: /home/admin/jetty/lib/jetty-ajp-7.1.6.v20100715.jar:/home/admin/jetty/lib/jetty-jmx-7.1.6.v20100715.jar:/home/admin/jetty/lib/jsp/com.sun.el_1.0.0.v201004190952.jar:/home/admin/jetty/lib/jsp/ecj-3.6.jar:/home/admin/jetty/lib/jsp/javax.el_2.1.0.v201004190952.jar:/home/admin/jetty/lib/jsp/javax.servlet.jsp_2.1.0.v201004190952.jar:/home/admin/jetty/lib/jsp/javax.servlet.jsp.jstl_1.2.0.v201004190952.jar:/home/admin/jetty/lib/jsp/jetty-jsp-2.1-7.1.6.v20100715.jar:/home/admin/jetty/lib/jsp/org.apache.jasper.glassfish_2.1.0.v201007080150.jar:/home/admin/jetty/lib/jsp/org.apache.taglibs.standard.glassfish_1.2.0.v201004190952.jar:/home/admin/jetty/resources:/home/admin/jetty/lib/jetty-util-7.1.6.v20100715.jar:/home/admin/jetty/lib/jetty-io-7.1.6.v20100715.jar org.eclipse.jetty.xml.XmlConfiguration /home/admin/jetty/etc/jetty.xml /home/admin/jetty/etc/jetty-deploy.xml /home/admin/jetty/etc/jetty-logging.xml
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5.4pt;mso-para-margin:0cm;mso-para-margin-bottom:.0001pt;mso-pagination:widow-orphan;font-size:10.5pt;mso-bidi-font-size:11.0pt;font-family:"Calibri","sans-serif";mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:"Times New Roman";mso-bidi-theme-font:minor-bidi;mso-font-kerning:1.0pt;}--><!-- [endif]---->
-cp后是classpath,org.eclipse.jetty.xml.XmlConfiguration是MainClass,大家可以猜猜org.eclipse.jetty.xml.XmlConfiguration是哪个ClassLoader加载的?同样加载他的只能依靠系统加载器来完成。同时classpath中的lib/中的类都由系统类加载器完成。

而进程内启动则不同,通过自定义的Loader加载器完成对MainClass的加载,通过反射方式运行MainClass的main()方法,后续所有的lib/中的类都以该自定义Loader做为加载器。
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Accent 5"/><w:LsdException Locked="false" Priority="65" SemiHidden="false"UnhideWhenUsed="false" Name="Medium List 1 Accent 5"/><w:LsdException Locked="false" Priority="66" SemiHidden="false"UnhideWhenUsed="false" Name="Medium List 2 Accent 5"/><w:LsdException Locked="false" Priority="67" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 1 Accent 5"/><w:LsdException Locked="false" Priority="68" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 2 Accent 5"/><w:LsdException Locked="false" Priority="69" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 3 Accent 5"/><w:LsdException Locked="false" Priority="70" SemiHidden="false"UnhideWhenUsed="false" Name="Dark List Accent 5"/><w:LsdException Locked="false" Priority="71" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful Shading Accent 5"/><w:LsdException Locked="false" Priority="72" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful List Accent 5"/><w:LsdException Locked="false" Priority="73" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful Grid Accent 5"/><w:LsdException Locked="false" Priority="60" SemiHidden="false"UnhideWhenUsed="false" Name="Light Shading Accent 6"/><w:LsdException Locked="false" Priority="61" SemiHidden="false"UnhideWhenUsed="false" Name="Light List Accent 6"/><w:LsdException Locked="false" Priority="62" SemiHidden="false"UnhideWhenUsed="false" Name="Light Grid Accent 6"/><w:LsdException Locked="false" Priority="63" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Shading 1 Accent 6"/><w:LsdException Locked="false" Priority="64" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Shading 2 Accent 6"/><w:LsdException Locked="false" Priority="65" SemiHidden="false"UnhideWhenUsed="false" Name="Medium List 1 Accent 6"/><w:LsdException Locked="false" Priority="66" SemiHidden="false"UnhideWhenUsed="false" Name="Medium List 2 Accent 6"/><w:LsdException Locked="false" Priority="67" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 1 Accent 6"/><w:LsdException Locked="false" Priority="68" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 2 Accent 6"/><w:LsdException Locked="false" Priority="69" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 3 Accent 6"/><w:LsdException Locked="false" Priority="70" SemiHidden="false"UnhideWhenUsed="false" Name="Dark List Accent 6"/><w:LsdException Locked="false" Priority="71" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful Shading Accent 6"/><w:LsdException Locked="false" Priority="72" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful List Accent 6"/><w:LsdException Locked="false" Priority="73" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful Grid Accent 6"/><w:LsdException Locked="false" Priority="19" SemiHidden="false"UnhideWhenUsed="false" QFormat="true" Name="Subtle Emphasis"/><w:LsdException Locked="false" Priority="21" SemiHidden="false"UnhideWhenUsed="false" QFormat="true" Name="Intense Emphasis"/><w:LsdException Locked="false" Priority="31" SemiHidden="false"UnhideWhenUsed="false" QFormat="true" Name="Subtle Reference"/><w:LsdException Locked="false" Priority="32" SemiHidden="false"UnhideWhenUsed="false" QFormat="true" Name="Intense Reference"/><w:LsdException Locked="false" Priority="33" SemiHidden="false"UnhideWhenUsed="false" QFormat="true" Name="Book Title"/><w:LsdException Locked="false" Priority="37" Name="Bibliography"/><w:LsdException Locked="false" Priority="39" QFormat="true" Name="TOC Heading"/></w:LatentStyles></xml><![endif]--><!--  [if gte mso 10]><mce:style><!--/* Style Definitions */table.MsoNormalTable{mso-style-name:普通表格;mso-tstyle-rowband-size:0;mso-tstyle-colband-size:0;mso-style-noshow:yes;mso-style-priority:99;mso-style-qformat:yes;mso-style-parent:"";mso-padding-alt:0cm 5.4pt 0cm 5.4pt;mso-para-margin:0cm;mso-para-margin-bottom:.0001pt;mso-pagination:widow-orphan;font-size:10.5pt;mso-bidi-font-size:11.0pt;font-family:"Calibri","sans-serif";mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:"Times New Roman";mso-bidi-theme-font:minor-bidi;mso-font-kerning:1.0pt;}--><!-- [endif]---->

  • WebApp自定义类加载器
上面我们说了jetty服务器lib/中的jar都是系统自定义加载器加载的,如果让这个系统自定义加载器来加载WEB-INF/lib、WEB-INF/classes下的类,那么在这个服务器下WEB应用之间可能就会相互影响了,并且服务器绝大多数时候并不需要应用/WEB-INF/lib下的类,于是WebApp自定义类加载器应运而生,Jetty中默认叫WebAppClassLoader。
  /** Constructor.*/public WebAppClassLoader(ClassLoader parent, Context context)throws IOException{super(new URL[]{},parent!=null?parent:(Thread.currentThread().getContextClassLoader()!=null?Thread.currentThread().getContextClassLoader():(WebAppClassLoader.class.getClassLoader()!=null?WebAppClassLoader.class.getClassLoader():ClassLoader.getSystemClassLoader())));…….}
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Accent 2"/><w:LsdException Locked="false" Priority="73" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful Grid Accent 2"/><w:LsdException Locked="false" Priority="60" SemiHidden="false"UnhideWhenUsed="false" Name="Light Shading Accent 3"/><w:LsdException Locked="false" Priority="61" SemiHidden="false"UnhideWhenUsed="false" Name="Light List Accent 3"/><w:LsdException Locked="false" Priority="62" SemiHidden="false"UnhideWhenUsed="false" Name="Light Grid Accent 3"/><w:LsdException Locked="false" Priority="63" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Shading 1 Accent 3"/><w:LsdException Locked="false" Priority="64" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Shading 2 Accent 3"/><w:LsdException Locked="false" Priority="65" SemiHidden="false"UnhideWhenUsed="false" Name="Medium List 1 Accent 3"/><w:LsdException Locked="false" Priority="66" SemiHidden="false"UnhideWhenUsed="false" Name="Medium List 2 Accent 3"/><w:LsdException Locked="false" Priority="67" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 1 Accent 3"/><w:LsdException Locked="false" Priority="68" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 2 Accent 3"/><w:LsdException Locked="false" Priority="69" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 3 Accent 3"/><w:LsdException Locked="false" Priority="70" SemiHidden="false"UnhideWhenUsed="false" Name="Dark List Accent 3"/><w:LsdException Locked="false" Priority="71" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful Shading Accent 3"/><w:LsdException Locked="false" Priority="72" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful List Accent 3"/><w:LsdException Locked="false" Priority="73" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful Grid Accent 3"/><w:LsdException Locked="false" Priority="60" SemiHidden="false"UnhideWhenUsed="false" Name="Light Shading Accent 4"/><w:LsdException Locked="false" Priority="61" SemiHidden="false"UnhideWhenUsed="false" Name="Light List Accent 4"/><w:LsdException Locked="false" Priority="62" SemiHidden="false"UnhideWhenUsed="false" Name="Light Grid Accent 4"/><w:LsdException Locked="false" Priority="63" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Shading 1 Accent 4"/><w:LsdException Locked="false" Priority="64" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Shading 2 Accent 4"/><w:LsdException Locked="false" Priority="65" SemiHidden="false"UnhideWhenUsed="false" Name="Medium List 1 Accent 4"/><w:LsdException Locked="false" Priority="66" SemiHidden="false"UnhideWhenUsed="false" Name="Medium List 2 Accent 4"/><w:LsdException Locked="false" Priority="67" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 1 Accent 4"/><w:LsdException Locked="false" Priority="68" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 2 Accent 4"/><w:LsdException Locked="false" Priority="69" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 3 Accent 4"/><w:LsdException Locked="false" Priority="70" SemiHidden="false"UnhideWhenUsed="false" Name="Dark List Accent 4"/><w:LsdException Locked="false" Priority="71" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful Shading Accent 4"/><w:LsdException Locked="false" Priority="72" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful List Accent 4"/><w:LsdException Locked="false" Priority="73" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful Grid Accent 4"/><w:LsdException Locked="false" Priority="60" SemiHidden="false"UnhideWhenUsed="false" Name="Light Shading Accent 5"/><w:LsdException Locked="false" Priority="61" SemiHidden="false"UnhideWhenUsed="false" Name="Light List Accent 5"/><w:LsdException Locked="false" Priority="62" SemiHidden="false"UnhideWhenUsed="false" Name="Light Grid Accent 5"/><w:LsdException Locked="false" Priority="63" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Shading 1 Accent 5"/><w:LsdException Locked="false" Priority="64" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Shading 2 Accent 5"/><w:LsdException Locked="false" Priority="65" SemiHidden="false"UnhideWhenUsed="false" Name="Medium List 1 Accent 5"/><w:LsdException Locked="false" Priority="66" SemiHidden="false"UnhideWhenUsed="false" Name="Medium List 2 Accent 5"/><w:LsdException Locked="false" Priority="67" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 1 Accent 5"/><w:LsdException Locked="false" Priority="68" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 2 Accent 5"/><w:LsdException Locked="false" Priority="69" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 3 Accent 5"/><w:LsdException Locked="false" Priority="70" SemiHidden="false"UnhideWhenUsed="false" Name="Dark List Accent 5"/><w:LsdException Locked="false" Priority="71" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful Shading Accent 5"/><w:LsdException Locked="false" Priority="72" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful List Accent 5"/><w:LsdException Locked="false" Priority="73" 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Accent 6"/><w:LsdException Locked="false" Priority="68" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 2 Accent 6"/><w:LsdException Locked="false" Priority="69" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 3 Accent 6"/><w:LsdException Locked="false" Priority="70" SemiHidden="false"UnhideWhenUsed="false" Name="Dark List Accent 6"/><w:LsdException Locked="false" Priority="71" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful Shading Accent 6"/><w:LsdException Locked="false" Priority="72" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful List Accent 6"/><w:LsdException Locked="false" Priority="73" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful Grid Accent 6"/><w:LsdException Locked="false" Priority="19" SemiHidden="false"UnhideWhenUsed="false" QFormat="true" Name="Subtle Emphasis"/><w:LsdException Locked="false" Priority="21" SemiHidden="false"UnhideWhenUsed="false" QFormat="true" Name="Intense Emphasis"/><w:LsdException Locked="false" Priority="31" SemiHidden="false"UnhideWhenUsed="false" QFormat="true" Name="Subtle Reference"/><w:LsdException Locked="false" Priority="32" SemiHidden="false"UnhideWhenUsed="false" QFormat="true" Name="Intense Reference"/><w:LsdException Locked="false" Priority="33" SemiHidden="false"UnhideWhenUsed="false" QFormat="true" Name="Book Title"/><w:LsdException Locked="false" Priority="37" Name="Bibliography"/><w:LsdException Locked="false" Priority="39" QFormat="true" Name="TOC Heading"/></w:LatentStyles></xml><![endif]--><!--  [if gte mso 10]><mce:style><!--/* Style Definitions */table.MsoNormalTable{mso-style-name:普通表格;mso-tstyle-rowband-size:0;mso-tstyle-colband-size:0;mso-style-noshow:yes;mso-style-priority:99;mso-style-qformat:yes;mso-style-parent:"";mso-padding-alt:0cm 5.4pt 0cm 5.4pt;mso-para-margin:0cm;mso-para-margin-bottom:.0001pt;mso-pagination:widow-orphan;font-size:10.5pt;mso-bidi-font-size:11.0pt;font-family:"Calibri","sans-serif";mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:"Times New Roman";mso-bidi-theme-font:minor-bidi;mso-font-kerning:1.0pt;}--><!-- [endif]---->
他是以当前线程上下文的ClassLoader为父classloader,如果上下文没有设定classLoader,俺么就使用加载WebAppClassLoader的加载器,如果还是没有,则采用系统类加载器。很明显,默认情况下,如果采用进程内运行,那么这个parent就是Loader(系统自定义类加载器),如果是进程外,parent就是系统类加载器。

WebAppClassLoader可以设定是否由parent优先加载lib/、classes下的类。
  <!--  [if gte mso 9]><xml><w:WordDocument><w:View>Normal</w:View><w:Zoom>0</w:Zoom><w:TrackMoves/><w:TrackFormatting/><w:PunctuationKerning/><w:DrawingGridVerticalSpacing>7.8 磅</w:DrawingGridVerticalSpacing><w:DisplayHorizontalDrawingGridEvery>0</w:DisplayHorizontalDrawingGridEvery><w:DisplayVerticalDrawingGridEvery>2</w:DisplayVerticalDrawingGridEvery><w:ValidateAgainstSchemas/><w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid><w:IgnoreMixedContent>false</w:IgnoreMixedContent><w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText><w:DoNotPromoteQF/><w:LidThemeOther>EN-US</w:LidThemeOther><w:LidThemeAsian>ZH-CN</w:LidThemeAsian><w:LidThemeComplexScript>X-NONE</w:LidThemeComplexScript><w:Compatibility><w:SpaceForUL/><w:BalanceSingleByteDoubleByteWidth/><w:DoNotLeaveBackslashAlone/><w:ULTrailSpace/><w:DoNotExpandShiftReturn/><w:AdjustLineHeightInTable/><w:BreakWrappedTables/><w:SnapToGridInCell/><w:WrapTextWithPunct/><w:UseAsianBreakRules/><w:DontGrowAutofit/><w:SplitPgBreakAndParaMark/><w:DontVertAlignCellWithSp/><w:DontBreakConstrainedForcedTables/><w:DontVertAlignInTxbx/><w:Word11KerningPairs/><w:CachedColBalance/><w:UseFELayout/></w:Compatibility><m:mathPr><m:mathFont m:val="Cambria Math"/><m:brkBin m:val="before"/><m:brkBinSub m:val="&#45;-"/><m:smallFrac m:val="off"/><m:dispDef/><m:lMargin m:val="0"/><m:rMargin m:val="0"/><m:defJc m:val="centerGroup"/><m:wrapIndent m:val="1440"/><m:intLim m:val="subSup"/><m:naryLim m:val="undOvr"/></m:mathPr></w:WordDocument></xml><![endif]--><!--  [if gte mso 9]><xml><w:LatentStyles DefLockedState="false" DefUnhideWhenUsed="true"DefSemiHidden="true" DefQFormat="false" DefPriority="99"LatentStyleCount="267"><w:LsdException Locked="false" Priority="0" SemiHidden="false"UnhideWhenUsed="false" QFormat="true" Name="Normal"/><w:LsdException Locked="false" Priority="9" SemiHidden="false"UnhideWhenUsed="false" QFormat="true" Name="heading 1"/><w:LsdException Locked="false" Priority="9" QFormat="true" Name="heading 2"/><w:LsdException Locked="false" Priority="9" QFormat="true" Name="heading 3"/><w:LsdException Locked="false" Priority="9" QFormat="true" Name="heading 4"/><w:LsdException Locked="false" Priority="9" QFormat="true" Name="heading 5"/><w:LsdException Locked="false" Priority="9" QFormat="true" Name="heading 6"/><w:LsdException Locked="false" Priority="9" QFormat="true" Name="heading 7"/><w:LsdException Locked="false" Priority="9" QFormat="true" Name="heading 8"/><w:LsdException Locked="false" Priority="9" QFormat="true" Name="heading 9"/><w:LsdException Locked="false" Priority="39" Name="toc 1"/><w:LsdException Locked="false" Priority="39" Name="toc 2"/><w:LsdException Locked="false" Priority="39" Name="toc 3"/><w:LsdException Locked="false" Priority="39" Name="toc 4"/><w:LsdException Locked="false" Priority="39" Name="toc 5"/><w:LsdException Locked="false" Priority="39" Name="toc 6"/><w:LsdException Locked="false" Priority="39" Name="toc 7"/><w:LsdException Locked="false" Priority="39" Name="toc 8"/><w:LsdException Locked="false" Priority="39" Name="toc 9"/><w:LsdException Locked="false" Priority="35" QFormat="true" Name="caption"/><w:LsdException Locked="false" Priority="10" SemiHidden="false"UnhideWhenUsed="false" QFormat="true" Name="Title"/><w:LsdException Locked="false" Priority="1" Name="Default Paragraph Font"/><w:LsdException Locked="false" Priority="11" SemiHidden="false"UnhideWhenUsed="false" QFormat="true" Name="Subtitle"/><w:LsdException Locked="false" Priority="22" SemiHidden="false"UnhideWhenUsed="false" QFormat="true" Name="Strong"/><w:LsdException Locked="false" Priority="20" SemiHidden="false"UnhideWhenUsed="false" QFormat="true" Name="Emphasis"/><w:LsdException Locked="false" Priority="59" SemiHidden="false"UnhideWhenUsed="false" Name="Table Grid"/><w:LsdException Locked="false" UnhideWhenUsed="false" Name="Placeholder Text"/><w:LsdException Locked="false" Priority="1" SemiHidden="false"UnhideWhenUsed="false" QFormat="true" Name="No Spacing"/><w:LsdException Locked="false" Priority="60" SemiHidden="false"UnhideWhenUsed="false" Name="Light Shading"/><w:LsdException Locked="false" Priority="61" SemiHidden="false"UnhideWhenUsed="false" Name="Light List"/><w:LsdException Locked="false" Priority="62" SemiHidden="false"UnhideWhenUsed="false" Name="Light Grid"/><w:LsdException Locked="false" Priority="63" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Shading 1"/><w:LsdException Locked="false" Priority="64" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Shading 2"/><w:LsdException Locked="false" Priority="65" SemiHidden="false"UnhideWhenUsed="false" Name="Medium List 1"/><w:LsdException Locked="false" Priority="66" SemiHidden="false"UnhideWhenUsed="false" Name="Medium List 2"/><w:LsdException Locked="false" Priority="67" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 1"/><w:LsdException Locked="false" Priority="68" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 2"/><w:LsdException Locked="false" Priority="69" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 3"/><w:LsdException Locked="false" Priority="70" SemiHidden="false"UnhideWhenUsed="false" Name="Dark List"/><w:LsdException Locked="false" Priority="71" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful Shading"/><w:LsdException Locked="false" Priority="72" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful List"/><w:LsdException Locked="false" Priority="73" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful Grid"/><w:LsdException Locked="false" Priority="60" SemiHidden="false"UnhideWhenUsed="false" Name="Light Shading Accent 1"/><w:LsdException Locked="false" Priority="61" SemiHidden="false"UnhideWhenUsed="false" Name="Light List Accent 1"/><w:LsdException Locked="false" Priority="62" SemiHidden="false"UnhideWhenUsed="false" Name="Light Grid Accent 1"/><w:LsdException Locked="false" Priority="63" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Shading 1 Accent 1"/><w:LsdException Locked="false" Priority="64" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Shading 2 Accent 1"/><w:LsdException Locked="false" Priority="65" SemiHidden="false"UnhideWhenUsed="false" Name="Medium List 1 Accent 1"/><w:LsdException Locked="false" UnhideWhenUsed="false" Name="Revision"/><w:LsdException Locked="false" Priority="34" SemiHidden="false"UnhideWhenUsed="false" QFormat="true" Name="List Paragraph"/><w:LsdException Locked="false" Priority="29" SemiHidden="false"UnhideWhenUsed="false" QFormat="true" Name="Quote"/><w:LsdException Locked="false" Priority="30" SemiHidden="false"UnhideWhenUsed="false" QFormat="true" Name="Intense Quote"/><w:LsdException Locked="false" Priority="66" SemiHidden="false"UnhideWhenUsed="false" Name="Medium List 2 Accent 1"/><w:LsdException Locked="false" Priority="67" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 1 Accent 1"/><w:LsdException Locked="false" Priority="68" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 2 Accent 1"/><w:LsdException Locked="false" Priority="69" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 3 Accent 1"/><w:LsdException Locked="false" Priority="70" SemiHidden="false"UnhideWhenUsed="false" Name="Dark List Accent 1"/><w:LsdException Locked="false" Priority="71" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful Shading Accent 1"/><w:LsdException Locked="false" Priority="72" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful List Accent 1"/><w:LsdException Locked="false" Priority="73" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful Grid Accent 1"/><w:LsdException Locked="false" Priority="60" SemiHidden="false"UnhideWhenUsed="false" Name="Light Shading Accent 2"/><w:LsdException Locked="false" Priority="61" SemiHidden="false"UnhideWhenUsed="false" Name="Light List Accent 2"/><w:LsdException Locked="false" Priority="62" SemiHidden="false"UnhideWhenUsed="false" Name="Light Grid Accent 2"/><w:LsdException Locked="false" Priority="63" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Shading 1 Accent 2"/><w:LsdException Locked="false" Priority="64" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Shading 2 Accent 2"/><w:LsdException Locked="false" Priority="65" SemiHidden="false"UnhideWhenUsed="false" Name="Medium List 1 Accent 2"/><w:LsdException Locked="false" Priority="66" SemiHidden="false"UnhideWhenUsed="false" Name="Medium List 2 Accent 2"/><w:LsdException Locked="false" Priority="67" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 1 Accent 2"/><w:LsdException Locked="false" Priority="68" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 2 Accent 2"/><w:LsdException Locked="false" Priority="69" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 3 Accent 2"/><w:LsdException Locked="false" Priority="70" SemiHidden="false"UnhideWhenUsed="false" Name="Dark List Accent 2"/><w:LsdException Locked="false" Priority="71" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful Shading Accent 2"/><w:LsdException Locked="false" Priority="72" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful List Accent 2"/><w:LsdException Locked="false" Priority="73" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful Grid Accent 2"/><w:LsdException Locked="false" Priority="60" SemiHidden="false"UnhideWhenUsed="false" Name="Light Shading Accent 3"/><w:LsdException Locked="false" Priority="61" SemiHidden="false"UnhideWhenUsed="false" Name="Light List Accent 3"/><w:LsdException Locked="false" Priority="62" SemiHidden="false"UnhideWhenUsed="false" Name="Light Grid Accent 3"/><w:LsdException Locked="false" Priority="63" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Shading 1 Accent 3"/><w:LsdException Locked="false" Priority="64" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Shading 2 Accent 3"/><w:LsdException Locked="false" Priority="65" SemiHidden="false"UnhideWhenUsed="false" Name="Medium List 1 Accent 3"/><w:LsdException Locked="false" Priority="66" SemiHidden="false"UnhideWhenUsed="false" Name="Medium List 2 Accent 3"/><w:LsdException Locked="false" Priority="67" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 1 Accent 3"/><w:LsdException Locked="false" Priority="68" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 2 Accent 3"/><w:LsdException Locked="false" Priority="69" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 3 Accent 3"/><w:LsdException Locked="false" Priority="70" SemiHidden="false"UnhideWhenUsed="false" Name="Dark List Accent 3"/><w:LsdException Locked="false" Priority="71" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful Shading Accent 3"/><w:LsdException Locked="false" Priority="72" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful List Accent 3"/><w:LsdException Locked="false" Priority="73" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful Grid Accent 3"/><w:LsdException Locked="false" Priority="60" SemiHidden="false"UnhideWhenUsed="false" Name="Light Shading Accent 4"/><w:LsdException Locked="false" Priority="61" SemiHidden="false"UnhideWhenUsed="false" Name="Light List Accent 4"/><w:LsdException Locked="false" Priority="62" SemiHidden="false"UnhideWhenUsed="false" Name="Light Grid Accent 4"/><w:LsdException Locked="false" Priority="63" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Shading 1 Accent 4"/><w:LsdException Locked="false" Priority="64" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Shading 2 Accent 4"/><w:LsdException Locked="false" Priority="65" SemiHidden="false"UnhideWhenUsed="false" Name="Medium List 1 Accent 4"/><w:LsdException Locked="false" Priority="66" SemiHidden="false"UnhideWhenUsed="false" Name="Medium List 2 Accent 4"/><w:LsdException Locked="false" Priority="67" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 1 Accent 4"/><w:LsdException Locked="false" Priority="68" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 2 Accent 4"/><w:LsdException Locked="false" Priority="69" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 3 Accent 4"/><w:LsdException Locked="false" Priority="70" SemiHidden="false"UnhideWhenUsed="false" Name="Dark List Accent 4"/><w:LsdException Locked="false" Priority="71" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful Shading Accent 4"/><w:LsdException Locked="false" Priority="72" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful List Accent 4"/><w:LsdException Locked="false" Priority="73" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful Grid Accent 4"/><w:LsdException Locked="false" Priority="60" SemiHidden="false"UnhideWhenUsed="false" Name="Light Shading Accent 5"/><w:LsdException Locked="false" Priority="61" SemiHidden="false"UnhideWhenUsed="false" Name="Light List Accent 5"/><w:LsdException Locked="false" Priority="62" SemiHidden="false"UnhideWhenUsed="false" Name="Light Grid Accent 5"/><w:LsdException Locked="false" Priority="63" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Shading 1 Accent 5"/><w:LsdException Locked="false" Priority="64" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Shading 2 Accent 5"/><w:LsdException Locked="false" Priority="65" SemiHidden="false"UnhideWhenUsed="false" Name="Medium List 1 Accent 5"/><w:LsdException Locked="false" Priority="66" SemiHidden="false"UnhideWhenUsed="false" Name="Medium List 2 Accent 5"/><w:LsdException Locked="false" Priority="67" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 1 Accent 5"/><w:LsdException Locked="false" Priority="68" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 2 Accent 5"/><w:LsdException Locked="false" Priority="69" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 3 Accent 5"/><w:LsdException Locked="false" Priority="70" SemiHidden="false"UnhideWhenUsed="false" Name="Dark List Accent 5"/><w:LsdException Locked="false" Priority="71" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful Shading Accent 5"/><w:LsdException Locked="false" Priority="72" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful List Accent 5"/><w:LsdException Locked="false" Priority="73" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful Grid Accent 5"/><w:LsdException Locked="false" Priority="60" SemiHidden="false"UnhideWhenUsed="false" Name="Light Shading Accent 6"/><w:LsdException Locked="false" Priority="61" SemiHidden="false"UnhideWhenUsed="false" Name="Light List Accent 6"/><w:LsdException Locked="false" Priority="62" SemiHidden="false"UnhideWhenUsed="false" Name="Light Grid Accent 6"/><w:LsdException Locked="false" Priority="63" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Shading 1 Accent 6"/><w:LsdException Locked="false" Priority="64" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Shading 2 Accent 6"/><w:LsdException Locked="false" Priority="65" SemiHidden="false"UnhideWhenUsed="false" Name="Medium List 1 Accent 6"/><w:LsdException Locked="false" Priority="66" SemiHidden="false"UnhideWhenUsed="false" Name="Medium List 2 Accent 6"/><w:LsdException Locked="false" Priority="67" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 1 Accent 6"/><w:LsdException Locked="false" Priority="68" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 2 Accent 6"/><w:LsdException Locked="false" Priority="69" SemiHidden="false"UnhideWhenUsed="false" Name="Medium Grid 3 Accent 6"/><w:LsdException Locked="false" Priority="70" SemiHidden="false"UnhideWhenUsed="false" Name="Dark List Accent 6"/><w:LsdException Locked="false" Priority="71" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful Shading Accent 6"/><w:LsdException Locked="false" Priority="72" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful List Accent 6"/><w:LsdException Locked="false" Priority="73" SemiHidden="false"UnhideWhenUsed="false" Name="Colorful Grid Accent 6"/><w:LsdException Locked="false" Priority="19" SemiHidden="false"UnhideWhenUsed="false" QFormat="true" Name="Subtle Emphasis"/><w:LsdException Locked="false" Priority="21" SemiHidden="false"UnhideWhenUsed="false" QFormat="true" Name="Intense Emphasis"/><w:LsdException Locked="false" Priority="31" SemiHidden="false"UnhideWhenUsed="false" QFormat="true" Name="Subtle Reference"/><w:LsdException Locked="false" Priority="32" SemiHidden="false"UnhideWhenUsed="false" QFormat="true" Name="Intense Reference"/><w:LsdException Locked="false" Priority="33" SemiHidden="false"UnhideWhenUsed="false" QFormat="true" Name="Book Title"/><w:LsdException Locked="false" Priority="37" Name="Bibliography"/><w:LsdException Locked="false" Priority="39" QFormat="true" Name="TOC Heading"/></w:LatentStyles></xml><![endif]--><!--  [if gte mso 10]><mce:style><!--/* Style Definitions */table.MsoNormalTable{mso-style-name:普通表格;mso-tstyle-rowband-size:0;mso-tstyle-colband-size:0;mso-style-noshow:yes;mso-style-priority:99;mso-style-qformat:yes;mso-style-parent:"";mso-padding-alt:0cm 5.4pt 0cm 5.4pt;mso-para-margin:0cm;mso-para-margin-bottom:.0001pt;mso-pagination:widow-orphan;font-size:10.5pt;mso-bidi-font-size:11.0pt;font-family:"Calibri","sans-serif";mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:"Times New Roman";mso-bidi-theme-font:minor-bidi;mso-font-kerning:1.0pt;}--><!-- [endif]---->
Jetty的ClassLoader体系结构可以使用下图来简单表示:
DSC0000.gif

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