Idea中tomcat启动源码调试进入到tomcat内部进行调试的方法

使用idea开发工具调试代码的时候，如果是java的web项目，使用的是tomcat作为web容器，打断点debug调试跟踪，当跟踪到org.apache.catalina包下的时候，则无法进入，这是因为idea运行的tomcat是通过插件的方式集成的，tomcat里面的lib包不再项目的依赖路径中，所以不能跟踪进去

首先在自己项目中被tomcat回调的接口实现类中，标记一个断点信息，通过idea启动web项目，当出现如图所示的断点信息的时候，因为断点位置标记的是tomcat回调的接口类，所以按照调用堆栈网上则是tomcat内部代码，但此时双击org.apache.catalina包下面的类名，是没有任何反应的，因为我们还没有将tomcat对应的依赖文件添加到classpath下面


添加依赖

<dependency>

<groupId>org.apache.tomcat</groupId>

<artifactId>tomcat-catalina</artifactId>

<version>8.5.55</version>

<scope>provided</scope>

</dependency>因为运行时使用的是tomcat的lib目录下面的jar文件，所以此处的scope使用
provided方式


下面就可以进入到tomcat源码调试了

tomcat启动日志是怎么执行打出来的？

03-Jun-2022 10:31:30.929 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Server.服务器版本: Apache Tomcat/8.5.55

03-Jun-2022 10:31:30.938 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 服务器构建:    May 5 2022 22:10:54 UTC

03-Jun-2022 10:31:30.938 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 服务器版本号(:   8.5.55.0

03-Jun-2022 10:31:30.938 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 操作系统名称:   Windows 10

03-Jun-2022 10:31:30.938 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log OS.版本:      10.0

03-Jun-2022 10:31:30.938 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 架构:       amd64

03-Jun-2022 10:31:30.939 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Java 环境变量:   C:\Program Files\Java\jdk1.8.0_212\jre

03-Jun-2022 10:31:30.939 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Java虚拟机版本:  1.8.0_212-b10

03-Jun-2022 10:31:30.939 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log JVM.供应商:    Oracle Corporation

03-Jun-2022 10:31:30.939 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log CATALINA_BASE:   C:\Users\Administrator\.IntelliJIdea2022.3\system\tomcat\Unnamed_spring-shiro-training

03-Jun-2022 10:31:30.939 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log CATALINA_HOME:   D:\tomcat8.5.55\apache-tomcat-8.5.55

通过定位到 VersionLoggerListener 日志可以查看到

private void log() {

log.info(sm.getString(“versionLoggerListener.serverInfo.server.version”,

  ServerInfo.getServerInfo()));

log.info(sm.getString(“versionLoggerListener.serverInfo.server.built”,

  ServerInfo.getServerBuilt()));

log.info(sm.getString(“versionLoggerListener.serverInfo.server.number”,

  ServerInfo.getServerNumber()));

log.info(sm.getString(“versionLoggerListener.os.name”,

  System.getProperty(“os.name”)));

log.info(sm.getString(“versionLoggerListener.os.version”,

  System.getProperty(“os.version”)));

log.info(sm.getString(“versionLoggerListener.os.arch”,

  System.getProperty(“os.arch”)));

log.info(sm.getString(“versionLoggerListener.java.home”,

  System.getProperty(“java.home”)));

log.info(sm.getString(“versionLoggerListener.vm.version”,

  System.getProperty(“java.runtime.version”)));

log.info(sm.getString(“versionLoggerListener.vm.vendor”,

  System.getProperty(“java.vm.vendor”)));

log.info(sm.getString(“versionLoggerListener.catalina.base”,

  System.getProperty(“catalina.base”)));

log.info(sm.getString(“versionLoggerListener.catalina.home”,

  System.getProperty(“catalina.home”)));

if (logArgs) {

List<String> args = ManagementFactory.getRuntimeMXBean().getInputArguments();

for (String arg : args) {

  log.info(sm.getString(“versionLoggerListener.arg”, arg));

}

}

if (logEnv) {

SortedMap<String, String> sortedMap = new TreeMap<>(System.getenv());

for (Map.Entry<String, String> e : sortedMap.entrySet()) {

  log.info(sm.getString(“versionLoggerListener.env”, e.getKey(), e.getValue()));

}

}

if (logProps) {

SortedMap<String, String> sortedMap = new TreeMap<>();

for (Map.Entry<Object, Object> e : System.getProperties().entrySet()) {

  sortedMap.put(String.valueOf(e.getKey()), String.valueOf(e.getValue()));

}

for (Map.Entry<String, String> e : sortedMap.entrySet()) {

  log.info(sm.getString(“versionLoggerListener.prop”, e.getKey(), e.getValue()));

}

}

}发现是通过键值对的方式获取的，
再通过字符串全局搜索发现

但是匹配的是英文，
那么中文是怎么打出来的呢？

最后通过调试发现找的是这个

类似上面的东西,调试的时候发现tocmat的东西启动还是相当多的

且看下面这个

idea tomcat启动后的数据

03-Jun-2022 10:31:30.939 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行参数：-Djava.util.logging.config.file=C:\Users\Administrator\.IntelliJIdea2022.3\system\tomcat\Unnamed_spring-shiro-training\conf\logging.properties

03-Jun-2022 10:31:30.940 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行参数：-Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager

03-Jun-2022 10:31:30.940 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行参数：-agentlib:jdwp=transport=dt_socket,address=127.0.0.1:52290,suspend=y,server=n

03-Jun-2022 10:31:30.940 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行参数：-javaagent:C:\Users\Administrator\.IntelliJIdea2022.3\system\captureAgent\debugger-agent.jar

03-Jun-2022 10:31:30.940 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行参数：-Dfile.encoding=UTF-8

03-Jun-2022 10:31:30.940 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行参数：-Dcom.sun.management.jmxremote=

03-Jun-2022 10:31:30.940 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行参数：-Dcom.sun.management.jmxremote.port=1099

03-Jun-2022 10:31:30.940 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行参数：-Dcom.sun.management.jmxremote.ssl=false

03-Jun-2022 10:31:30.940 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行参数：-Dcom.sun.management.jmxremote.password.file=C:\Users\Administrator\.IntelliJIdea2022.3\system\tomcat\Unnamed_spring-shiro-training\jmxremote.password

03-Jun-2022 10:31:30.940 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行参数：-Dcom.sun.management.jmxremote.access.file=C:\Users\Administrator\.IntelliJIdea2022.3\system\tomcat\Unnamed_spring-shiro-training\jmxremote.access

03-Jun-2022 10:31:30.940 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行参数：-Djava.rmi.server.hostname=127.0.0.1

03-Jun-2022 10:31:30.940 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行参数：-Djdk.tls.ephemeralDHKeySize=2048

03-Jun-2022 10:31:30.940 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行参数：-Djava.protocol.handler.pkgs=org.apache.catalina.webresources

03-Jun-2022 10:31:30.941 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行参数：-Dignore.endorsed.dirs=

03-Jun-2022 10:31:30.941 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行参数：-Dcatalina.base=C:\Users\Administrator\.IntelliJIdea2022.3\system\tomcat\Unnamed_spring-shiro-training

03-Jun-2022 10:31:30.941 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行参数：-Dcatalina.home=D:\tomcat8.5.55\apache-tomcat-8.5.55

03-Jun-2022 10:31:30.941 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行参数：-Djava.io.tmpdir=D:\tomcat8.5.55\apache-tomcat-8.5.55\temp

以上还只是基本的环境配置等启动

然后是准备链接到tomcat服务

03-Jun-2022 10:31:30.941 信息 [main] org.apache.catalina.core.AprLifecycleListener.lifecycleEvent 使用APR版本[1.7.0]加载了基于APR的Apache Tomcat本机库[1.2.24]。

03-Jun-2022 10:31:30.941 信息 [main] org.apache.catalina.core.AprLifecycleListener.lifecycleEvent APR功能：IPv6[true]、sendfile[true]、accept filters[false]、random[true]。

03-Jun-2022 10:31:30.941 信息 [main] org.apache.catalina.core.AprLifecycleListener.lifecycleEvent APR/OpenSSL配置：useAprConnector[false]，useOpenSSL[true]

03-Jun-2022 10:31:30.944 信息 [main] org.apache.catalina.core.AprLifecycleListener.initializeSSL OpenSSL成功初始化 [OpenSSL 1.1.1g  21 Apr 2022]

03-Jun-2022 10:31:31.032 信息 [main] org.apache.coyote.AbstractProtocol.init 初始化协议处理器 [“http-nio-8080”]

03-Jun-2022 10:31:31.046 信息 [main] org.apache.tomcat.util.net.NioSelectorPool.getSharedSelector Using a shared selector for servlet write/read

03-Jun-2022 10:31:31.055 信息 [main] org.apache.catalina.startup.Catalina.load Initialization processed in 175489 ms

03-Jun-2022 10:31:31.080 信息 [main] org.apache.catalina.core.StandardService.startInternal 正在启动服务[Catalina]

03-Jun-2022 10:31:31.080 信息 [main] org.apache.catalina.core.StandardEngine.startInternal Starting Servlet Engine: Apache Tomcat/8.5.55

03-Jun-2022 10:31:31.089 信息 [main] org.apache.coyote.AbstractProtocol.start 开始协议处理句柄[“http-nio-8080”]

03-Jun-2022 10:31:31.102 信息 [main] org.apache.catalina.startup.Catalina.start Server startup in 47 ms

tomat启动主要是在Catalina中

然后是

启动

/**

* Await and shutdown.

*/

public void await() {

getServer().await();

}其实tomcat启动本质上就是socket的服务器罢了

@Override

public void await() {

// Negative values – don’t wait on port – tomcat is embedded or we just don’t like ports

if (port == -2) {

// undocumented yet – for embedding APPs that are around, alive.

return;

}

if (port==-1) {

try {

  awaitThread = Thread.currentThread();

  while(!stopAwait) {

  try {

   Thread.sleep( 10000 );

  } catch( InterruptedException ex ) {

   // continue and check the flag

  }

  }

} finally {

  awaitThread = null;

}

return;

}

// Set up a server socket to wait on

try {

awaitSocket = new ServerSocket(port, 1,

  InetAddress.getByName(address));

} catch (IOException e) {

log.error(“StandardServer.await: create[” + address

    + “:” + port

    + “]: “, e);

return;

}

try {

awaitThread = Thread.currentThread();

// Loop waiting for a connection and a valid command

while (!stopAwait) {

  ServerSocket serverSocket = awaitSocket;

  if (serverSocket == null) {

  break;

  }

  // Wait for the next connection

  Socket socket = null;

  StringBuilder command = new StringBuilder();

  try {

  InputStream stream;

  long acceptStartTime = System.currentTimeMillis();

  try {

   socket = serverSocket.accept(); //一旦accecpt后面就开始执行了

   socket.setSoTimeout(10 * 1000); // Ten seconds

   stream = socket.getInputStream();

  } catch (SocketTimeoutException ste) {

   // This should never happen but bug 56684 suggests that

   // it does.

   log.warn(sm.getString(“standardServer.accept.timeout”,

    Long.valueOf(System.currentTimeMillis() – acceptStartTime)), ste);

   continue;

  } catch (AccessControlException ace) {

   log.warn(sm.getString(“standardServer.accept.security”), ace);

   continue;

  } catch (IOException e) {

   if (stopAwait) {

   // Wait was aborted with socket.close()

   break;

   }

   log.error(sm.getString(“standardServer.accept.error”), e);

   break;

  }

  // Read a set of characters from the socket

  int expected = 1024; // Cut off to avoid DoS attack

  while (expected < shutdown.length()) {

   if (random == null)

   random = new Random();

   expected += (random.nextInt() % 1024);

  }

  while (expected > 0) {

   int ch = -1;

   try {

   ch = stream.read();

   } catch (IOException e) {

   log.warn(sm.getString(“standardServer.accept.readError”), e);

   ch = -1;

   }

   // Control character or EOF (-1) terminates loop

   if (ch < 32 || ch == 127) {

   break;

   }

   command.append((char) ch);

   expected–;

  }

  } finally {

  // Close the socket now that we are done with it

  try {

   if (socket != null) {

   socket.close();

   }

  } catch (IOException e) {

   // Ignore

  }

  }

  // Match against our command string

  boolean match = command.toString().equals(shutdown);

  if (match) {

  log.info(sm.getString(“standardServer.shutdownViaPort”));

  break;

  } else

  log.warn(sm.getString(“standardServer.invalidShutdownCommand”, command.toString()));

}

} finally {

ServerSocket serverSocket = awaitSocket;

awaitThread = null;

awaitSocket = null;

// Close the server socket and return

if (serverSocket != null) {

  try {

  serverSocket.close();

  } catch (IOException e) {

  // Ignore

  }

}

}

}

tomcat容器启动之后，下面就是Springmvc模块的内容了

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