How to import Tomcat source code into idea

1. Download the tomcat code
2. Directory structure after downloading
3. The source code is built using ant (pom is used here instead)
4. Problem Solving

4.1 Console garbled characters
4.2 Access 8080 and report an error: jsp and other classes cannot be found

5. Visit localhost:8080

1. Download the tomcat code

This article chooses the 9.0 branch. This version of the servlet is still on github starting with javax

2. Directory structure after downloading

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3. The source code is built using ant (pom is used here instead)

<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>9.0.19</version>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
  </properties>
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.apache.ant</groupId>
      <artifactId>ant</artifactId>
      <version>1.10.11</version>
    </dependency>
    <dependency>
      <groupId>wsdl4j</groupId>
      <artifactId>wsdl4j</artifactId>
      <version>1.6.3</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/javax.xml.soap/javax.xml.soap-api -->
    <dependency>
      <groupId>javax.xml.soap</groupId>
      <artifactId>javax.xml.soap-api</artifactId>
      <version>1.4.0</version>
    </dependency>

    <dependency>
      <groupId>org.apache.geronimo.specs</groupId>
      <artifactId>geronimo-jaxrpc_1.1_spec</artifactId>
      <version>2.1</version>
    </dependency>

    <dependency>
      <groupId>org.eclipse.jdt</groupId>
      <artifactId>ecj</artifactId>
      <version>3.17.0</version>
    </dependency>


    <dependency>
      <groupId>org.easymock</groupId>
      <artifactId>easymock</artifactId>
      <version>4.0.2</version>
      <scope>test</scope>
    </dependency>

    <dependency>
      <groupId>biz.aQute.bnd</groupId>
      <artifactId>biz.aQute.bndlib</artifactId>
      <version>5.2.0</version>
      <scope>provided</scope>
    </dependency>

    <dependency>
      <groupId>com.unboundid</groupId>
      <artifactId>unboundid-ldapsdk</artifactId>
      <version>3.2.0</version>
    </dependency>
  </dependencies>

</project>

Use idea to re-import directly, and temporarily select jdk 1.8

4. Problem Solving

4.1 Console garbled characters

INFO: At least one JAR was scanned for TLD but does not yet contain the TLD. Enable debug logging for this logger to obtain the full list of JARs that were scanned but in which no TLDs were found. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
September 29, 2021 3:52:17 AM org.apache.catalina.util.SessionIdGeneratorBase createSecureRandom
WARNING: Creating SecureRandom instance for session ID generation using [SHA1PRNG] took [149] milliseconds.

September 29, 2021 3:52:17 Garbled Modify the encoding of conf/logging.properties (now defaults to utf-8, basically no changes) Warning: Using [SHA1PRNG] to create a SecureRandom instance for session ID generation took [149] milliseconds Garbled

The essential reason for the garbled characters here is that the properties file is garbled. Tomcat uses the system's way of reading configuration files, using URL.openStream, and then using the properties.load method, which will cause garbled characters.

Solution

Read and rewrite the two internationalization files Localizer and StringManager

4.2 Access 8080 and report an error: jsp and other classes cannot be found

Add a line of code to the org.apache.catalina.startup.ContextConfig#configureStart method //TODO manually added context.addServletContainerInitializer(new JasperInitializer(), null);

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5. Visit localhost:8080

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over

Note that if there are other compilation options, jdk11-16 can directly comment out other errors and solve them normally.

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