调试tomcat源码步骤

调试tomcat源码

下载tomcat源码

[email protected]:apache/tomcat.git

添加pom.xml

内容如下：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>Tomcat</artifactId>
    <name>Tomcat</name>
    <version>9.0</version>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>ant</groupId>
            <artifactId>ant</artifactId>
            <version>1.6.5</version>
        </dependency>
        <dependency>
            <groupId>ant</groupId>
            <artifactId>ant-apache-log4j</artifactId>
            <version>1.6.5</version>
        </dependency>
        <dependency>
            <groupId>ant</groupId>
            <artifactId>ant-commons-logging</artifactId>
            <version>1.6.5</version>
        </dependency>
        <dependency>
            <groupId>wsdl4j</groupId>
            <artifactId>wsdl4j</artifactId>
            <version>1.6.2</version>
        </dependency>
        <dependency>
            <groupId>javax.xml</groupId>
            <artifactId>jaxrpc</artifactId>
            <version>1.1</version>
        </dependency>
        <dependency>
            <groupId>org.eclipse.jdt.core.compiler</groupId>
            <artifactId>ecj</artifactId>
            <version>4.6.1</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
    </dependencies>
    <build>
        <finalName>Tomcat8.0</finalName>
        <sourceDirectory>java</sourceDirectory>
        <resources>
            <resource>
                <directory>java</directory>
            </resource>
        </resources>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.5</version>
                <configuration>
                    <encoding>UTF-8</encoding>
                    <source>${java.version}</source>
                    <target>${java.version}</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>


           

配置启动类

org.apache.catalina.startup.Bootstrap

默认加载tomcat自带的webapps目录下的资源，也可以配置自己的catalina.home，这时候需要指定启动参数如：

-Dcatalina.home="E:\workspace\apache-tomcat-8.5.34-src\home"

修改源码

由于版本太高，这个方法中使用的一些属性

org.apache.jasper.compiler.JDTCompiler#generateClass

CompilerOptions.VERSION_9           

我没有找到合适的版本，所以把这几行注释掉了

启动

经过上面的配置已经可以启动了，但是会遇到如下报错：

严重: Error configuring application listener of class [listeners.ContextListener]
java.lang.ClassNotFoundException: listeners.ContextListener
	at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1344)
	at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1173)
	at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:542)
	at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:523)
	at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:150)
	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4585)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5131)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:714)
	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:690)
	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:695)
	at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1133)
	at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1868)
	at java.util.concurrent.Executors$RunnableAdapter.call$$$capture(Executors.java:511)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java)
	at java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:266)
	at java.util.concurrent.FutureTask.run(FutureTask.java)
	at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
	at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:112)
	at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:1045)
	at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:429)
	at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1577)
	at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:309)
	at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123)
	at org.apache.catalina.util.LifecycleBase.setStateInternal(LifecycleBase.java:424)
	at org.apache.catalina.util.LifecycleBase.setState(LifecycleBase.java:367)
	at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:936)
	at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:831)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374)
	at java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:266)
	at java.util.concurrent.FutureTask.run(FutureTask.java)
	at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
	at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134)
	at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909)
	at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:261)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
	at org.apache.catalina.core.StandardService.startInternal(StandardService.java:522)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
	at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:801)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
	at org.apache.catalina.startup.Catalina.start(Catalina.java:637)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:352)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:541)           

这是在加载webapps目录下的应用时找不到相应的class导致的（也可能是加载路径的问题？）

我在这里是把它们删除了，添加的自己生成的一个war包是没有问题的。

现在就可以在本地访问8080端口访问自己的项目啦！