IntelliJ IDEA配置调试Tomcat8源码流程
- 调试环境
JDK版本:java version "1.8.0_131"
IDEA版本:Ultimate 2018.3.4
Tomcat源码版本:8.5.38
- Tomcat下载与目录配置
Apache Tomcat网址:https://tomcat.apache.org/download-80.cgi
Tomcat8.5.38源码直接下载链接:http://mirrors.tuna.tsinghua.edu.cn/apache/tomcat/tomcat-8/v8.5.38/src/apache-tomcat-8.5.38-src.zip(ps:直接复制粘贴到迅雷即可下载)
创建一个catalina_home目录,并把apache-tomcat-8.5.38-src源码目录中的conf和webapps两个目录复制过去:
在apache-tomcat-8.5.38-src源码目录中创建一个pom.xml文件,以便后面使用maven构建项目:
pom.xml文件依赖代码如下:
<?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>Tomcat8.5.38</artifactId>
<name>Tomcat8.5.38</name>
<version>8.5</version><properties>
<java.version>1.8</java.version>
</properties><dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.easymock</groupId>
<artifactId>easymock</artifactId>
<version>3.5.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>ant</groupId>
<artifactId>ant</artifactId>
<version>1.7.0</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.rpc</groupId>
<artifactId>javax.xml.rpc-api</artifactId>
<version>1.1</version>
</dependency>
<dependency>
<groupId>org.eclipse.jdt.core.compiler</groupId>
<artifactId>ecj</artifactId>
<version>4.6.1</version>
</dependency>
</dependencies><build>
<finalName>Tomcat8.5</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>
- IDEA导入Tomcat源码并配置运行
VM配置参数:
-Dcatalina.home=D:/Eclipse4.2/workspaceforidea/tomcat/catalina_home
-Dcatalina.base=D:/Eclipse4.2/workspaceforidea/tomcat/catalina_home
-Djava.endorsed.dirs=D:/Eclipse4.2/workspaceforidea/tomcat/catalina_home/endorsed
-Djava.io.tmpdir=D:/Eclipse4.2/workspaceforidea/tomcat/catalina_home/temp
-Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
-Djava.util.logging.config.file=D:/Eclipse4.2/workspaceforidea/tomcat/catalina_home/conf/logging.properties
配置完成后直接启动运行
输出如下信息表示我们自己的Tomcat已经启动起来了:
千辛万苦把Tomcat配置的启动起来了,却发现默认的页面无法打开:
经过重重排查,原因竟然是jsp的编译器没有初始化,我们只需要在apache-tomcat-8.5.38-src\java\org\apache\catalina\startup\ContextConfig.java类中只需添加一句代码即可手动初始化:
最后再次访问我们的localhost:8080,熟悉的猫猫终于出现了,????
ps:之前在编译Tomcat8.5.30的源码的时候在apache-tomcat-8.5.30-src\webapps\examples\WEB-INF\web.xml文件中碰到了一些Listener和servlet找不到的问题,其实这些实际的java文件在源码目录的webapps/examples/WEB-INF/classes目录中都可以找到,我们只需要在java目录下创建对应的目录和java类即可,然后修改web.xml文件中class节点的引用