Tomcat启动,类的加载顺序(参考Apache Tomcat 6.0 Class Loader)

最新推荐文章于 2024-04-20 13:04:27 发布

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最新推荐文章于 2024-04-20 13:04:27 发布

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分类专栏：开发技术文章标签： Tomcat Apache Ant Java Servlet

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本文详细介绍了Tomcat服务器的核心组件，包括Bootstrap、System和Common部分的功能及所包含的类库。Bootstrap部分负责加载JVM所需的类库；System部分包含启动程序的main()函数；Common部分则集成了Tomcat运行所需的各类服务实现。

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Bootstrap
|
System
|
Common
/ \
Webapp1 Webapp2 ...

Bootstrap :
包含了$JAVA_HOME/jre/lib和$JAVA_HOME/jre/lib/ext的类库,提供JVM支持

System :
$CATALINA_HOME/bin/bootstrap.jar - 包含main()函数
$CATALINA_HOME/bin/tomcat-juli.jar - Jakarta commons logging API, and java.util.logging LogManager

Common :
目录$CATALINA_HOME/lib下的类库:
默认有:
* annotations-api.jar - JEE annotations classes.
* catalina.jar - Implementation of the Catalina servlet container portion of Tomcat 6.
* catalina-ant.jar - Tomcat Catalina Ant tasks.
* catalina-ha.jar - High availability package.
* catalina-tribes.jar - Group communication package.
* el-api.jar - EL 2.1 API.
* jasper.jar - Jasper 2 Compiler and Runtime.
* jasper-el.jar - Jasper 2 EL implementation.
* jasper-jdt.jar - Eclipse JDT 3.2 Java compiler.
* jsp-api.jar - JSP 2.1 API.
* servlet-api.jar - Servlet 2.5 API.
* tomcat-coyote.jar - Tomcat connectors and utility classes.
* tomcat-dbcp.jar - package renamed database connection pool based on Commons DBCP.
* tomcat-i18n-**.jar - Optional JARs containing resource bundles for other languages. As default bundles are also included in each individual JAR, they can be safely removed if no internationalization of messages is needed.