浅谈tomcat1.7 --- windows环境tomcat启动的流程（1）；

电玩女神 2022-03-20 09:54 321阅读 0赞

六年老程序员了，coding 起来依然很欢乐.....

2020年4月  都在赶工加班，今天忙里偷闲，看下tomcat 源码，一丢丢认识，提笔记录下来；

特意搜索了tomcat的出处：

Tomcat的这个单词的意思是“公猫”，
    因为它的开发者姆斯·邓肯·戴维森希望用一种能够自己照顾自己的动物代表这个软件，于是命名为tomcat，
    它的Logo兼吉祥物也被设计成了一只公猫形象。

*  ## **tomcat1.7 目录：** ##

tomcat1.7
    　　|---bin          ：存放启动和关闭tomcat脚本，按支持windows的.bat和linux的.sh文件各式一份；
        |---conf         ：存放不同的配置文件（server.xml和web.xml）；
    　　|---lib          ：存放Tomcat运行需要依赖文件（JARS），因为tomcat本身是Java项目；
    　　|---logs         ：存放Tomcat执行时的日志文件；
    　　|---webapps      ：Tomcat的Web项目主要发布目录，也可以使用其他方式，如配置虚拟项目路径；
    　　|---work         ：存放jsp编译后产生的class文件；

## **2. bin文件夹：** ##

**2.1 startup.bat启动文件：**

该脚本文件的核心功能是判断环境变量是不是设置完备；条件完备的情况下，call()方法会调用同目录下的catalina.bat文件；

@echo off
    rem Licensed to the Apache Software Foundation (ASF) under one or more
    rem contributor license agreements.  See the NOTICE file distributed with
    rem this work for additional information regarding copyright ownership.
    rem The ASF licenses this file to You under the Apache License, Version 2.0
    rem (the "License"); you may not use this file except in compliance with
    rem the License.  You may obtain a copy of the License at
    rem
    rem     http://www.apache.org/licenses/LICENSE-2.0
    rem
    rem Unless required by applicable law or agreed to in writing, software
    rem distributed under the License is distributed on an "AS IS" BASIS,
    rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    rem See the License for the specific language governing permissions and
    rem limitations under the License.
    
    rem ---------------------------------------------------------------------------
    rem Start script for the CATALINA Server
    rem ---------------------------------------------------------------------------
    
    setlocal
    
    rem Guess CATALINA_HOME if not defined 判断CATALINA_HOME是不是已经完整配置
    set "CURRENT_DIR=%cd%"
    rem CATALINA_HOME设置的话，代码直接到gotHome处
    if not "%CATALINA_HOME%" == "" goto gotHome
    rem 
    set "CATALINA_HOME=%CURRENT_DIR%"
    rem 
    if exist "%CATALINA_HOME%\bin\catalina.bat" goto okHome
    cd ..
    set "CATALINA_HOME=%cd%"
    cd "%CURRENT_DIR%"
    :gotHome
    
    rem 判断CATALINA_HOME bin\catalina.bat的文件是不是存在 ，有到okHome处
    if exist "%CATALINA_HOME%\bin\catalina.bat" goto okHome
    echo The CATALINA_HOME environment variable is not defined correctly
    echo This environment variable is needed to run this program
    rem  没有文件的话，打印上面两行，程序结束
    goto end
    :okHome
    
    rem 设置要执行的文件
    set "EXECUTABLE=%CATALINA_HOME%\bin\catalina.bat"
    
    rem Check that target executable exists 执行文件存在 代码走到okExec
    if exist "%EXECUTABLE%" goto okExec
    echo Cannot find "%EXECUTABLE%"
    echo This file is needed to run this program
    goto end
    :okExec
    
    rem Get remaining unshifted command line arguments and save them in the
    rem 设置启动参数
    set CMD_LINE_ARGS=
    :setArgs
    if ""%1""=="""" goto doneSetArgs
    set CMD_LINE_ARGS=%CMD_LINE_ARGS% %1
    shift
    goto setArgs
    :doneSetArgs
    
    rem 启动catalina.bat文件
    call "%EXECUTABLE%" start %CMD_LINE_ARGS%
    
    rem 代码结束
    :end

**2.1  catalina.bat文件：**

命名出处：

Catalina是美国西海岸靠近洛杉矶22英里的一个小岛。Servlet运行模块的最早开发者Craig McClanahan因为喜欢Catalina岛故以Catalina命名他所开这个模块，尽管他从来也没有去过那里。
    
    另外在开发的早期阶段，Tomcat是被搭建在一个叫Avalon的服务器框架上，而Avalon则是Catalina岛上的一个小镇的名字，于是想一个与小镇名字相关联的单词也是自然而然。还有一个原因来自于Craig McClanahan养的猫，他养的猫在他写程序的时候喜欢在电脑周围闲逛。
    
    也可能是Catalina岛是个悠闲散步的好地方，猫的闲逛让Craig McClanahan想起了那里。

该文件的核心功能是在org.apache.catalina.startup.Bootstrap启动前，将相关的功能调动起来。比如Java运行环境（JRE），准备JVM，日志功能，catalina.policy文件等；

**较常用的设置**是在该文件中配置自定义的JVM内存区的大小；

例如：

set JAVA_OPTS=-server -Xms512m -Xmx1524m -XX:MaxNewSize=1024m -XX:MaxPermSize=256m

完整文件内容如下：

@echo off
    rem 自定义JVM各内存区大小
    set JAVA_OPTS=-server -Xms512m -Xmx1524m -XX:MaxNewSize=1024m -XX:MaxPermSize=256m 
    
    rem Licensed to the Apache Software Foundation (ASF) under one or more
    rem contributor license agreements.  See the NOTICE file distributed with
    rem this work for additional information regarding copyright ownership.
    rem The ASF licenses this file to You under the Apache License, Version 2.0
    rem (the "License"); you may not use this file except in compliance with
    rem the License.  You may obtain a copy of the License at
    rem
    rem     http://www.apache.org/licenses/LICENSE-2.0
    rem
    rem Unless required by applicable law or agreed to in writing, software
    rem distributed under the License is distributed on an "AS IS" BASIS,
    rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    rem See the License for the specific language governing permissions and
    rem limitations under the License.
    
    rem ---------------------------------------------------------------------------
    rem Start/Stop Script for the CATALINA Server
    rem
    rem Environment Variable Prerequisites
    rem
    rem   Do not set the variables in this script. Instead put them into a script
    rem   setenv.bat in CATALINA_BASE/bin to keep your customizations separate.
    rem
    rem   WHEN RUNNING TOMCAT AS A WINDOWS SERVICE:
    rem   Note that the environment variables that affect the behavior of this
    rem   script will have no effect at all on Windows Services. As such, any
    rem   local customizations made in a CATALINA_BASE/bin/setenv.bat script
    rem   will also have no effect on Tomcat when launched as a Windows Service.
    rem   The configuration that controls Windows Services is stored in the Windows
    rem   Registry, and is most conveniently maintained using the "tomcatXw.exe"
    rem   maintenance utility, where "X" is the major version of Tomcat you are
    rem   running.
    rem
    rem   CATALINA_HOME   May point at your Catalina "build" directory.
    rem
    rem   CATALINA_BASE   (Optional) Base directory for resolving dynamic portions
    rem                   of a Catalina installation.  If not present, resolves to
    rem                   the same directory that CATALINA_HOME points to.
    rem
    rem   CATALINA_OPTS   (Optional) Java runtime options used when the "start",
    rem                   "run" or "debug" command is executed.
    rem                   Include here and not in JAVA_OPTS all options, that should
    rem                   only be used by Tomcat itself, not by the stop process,
    rem                   the version command etc.
    rem                   Examples are heap size, GC logging, JMX ports etc.
    rem
    rem   CATALINA_TMPDIR (Optional) Directory path location of temporary directory
    rem                   the JVM should use (java.io.tmpdir).  Defaults to
    rem                   %CATALINA_BASE%\temp.
    rem
    rem   JAVA_HOME       Must point at your Java Development Kit installation.
    rem                   Required to run the with the "debug" argument.
    rem
    rem   JRE_HOME        Must point at your Java Runtime installation.
    rem                   Defaults to JAVA_HOME if empty. If JRE_HOME and JAVA_HOME
    rem                   are both set, JRE_HOME is used.
    rem
    rem   JAVA_OPTS       (Optional) Java runtime options used when any command
    rem                   is executed.
    rem                   Include here and not in CATALINA_OPTS all options, that
    rem                   should be used by Tomcat and also by the stop process,
    rem                   the version command etc.
    rem                   Most options should go into CATALINA_OPTS.
    rem
    rem   JAVA_ENDORSED_DIRS (Optional) Lists of of semi-colon separated directories
    rem                   containing some jars in order to allow replacement of APIs
    rem                   created outside of the JCP (i.e. DOM and SAX from W3C).
    rem                   It can also be used to update the XML parser implementation.
    rem                   Defaults to $CATALINA_HOME/endorsed.
    rem
    rem   JPDA_TRANSPORT  (Optional) JPDA transport used when the "jpda start"
    rem                   command is executed. The default is "dt_socket".
    rem
    rem   JPDA_ADDRESS    (Optional) Java runtime options used when the "jpda start"
    rem                   command is executed. The default is 8000.
    rem
    rem   JPDA_SUSPEND    (Optional) Java runtime options used when the "jpda start"
    rem                   command is executed. Specifies whether JVM should suspend
    rem                   execution immediately after startup. Default is "n".
    rem
    rem   JPDA_OPTS       (Optional) Java runtime options used when the "jpda start"
    rem                   command is executed. If used, JPDA_TRANSPORT, JPDA_ADDRESS,
    rem                   and JPDA_SUSPEND are ignored. Thus, all required jpda
    rem                   options MUST be specified. The default is:
    rem
    rem                   -agentlib:jdwp=transport=%JPDA_TRANSPORT%,
    rem                       address=%JPDA_ADDRESS%,server=y,suspend=%JPDA_SUSPEND%
    rem
    rem   JSSE_OPTS       (Optional) Java runtime options used to control the TLS
    rem                   implementation when JSSE is used. Default is:
    rem                   "-Djdk.tls.ephemeralDHKeySize=2048"
    rem
    rem   LOGGING_CONFIG  (Optional) Override Tomcat's logging config file
    rem                   Example (all one line)
    rem                   set LOGGING_CONFIG="-Djava.util.logging.config.file=%CATALINA_BASE%\conf\logging.properties"
    rem
    rem   LOGGING_MANAGER (Optional) Override Tomcat's logging manager
    rem                   Example (all one line)
    rem                   set LOGGING_MANAGER="-Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager"
    rem
    rem   TITLE           (Optional) Specify the title of Tomcat window. The default
    rem                   TITLE is Tomcat if it's not specified.
    rem                   Example (all one line)
    rem                   set TITLE=Tomcat.Cluster#1.Server#1 [%DATE% %TIME%]
    rem ---------------------------------------------------------------------------
    
    setlocal
    
    rem Suppress Terminate batch job on CTRL+C
    if not ""%1"" == ""run"" goto mainEntry
    if "%TEMP%" == "" goto mainEntry
    if exist "%TEMP%\%~nx0.run" goto mainEntry
    echo Y>"%TEMP%\%~nx0.run"
    if not exist "%TEMP%\%~nx0.run" goto mainEntry
    echo Y>"%TEMP%\%~nx0.Y"
    call "%~f0" %* <"%TEMP%\%~nx0.Y"
    rem Use provided errorlevel
    set RETVAL=%ERRORLEVEL%
    del /Q "%TEMP%\%~nx0.Y" >NUL 2>&1
    exit /B %RETVAL%
    :mainEntry
    del /Q "%TEMP%\%~nx0.run" >NUL 2>&1
    
    rem Guess CATALINA_HOME if not defined  再次判断CATALINA_HOME是不是已经设置
    set "CURRENT_DIR=%cd%"
    if not "%CATALINA_HOME%" == "" goto gotHome
    set "CATALINA_HOME=%CURRENT_DIR%"
    if exist "%CATALINA_HOME%\bin\catalina.bat" goto okHome
    cd ..
    set "CATALINA_HOME=%cd%"
    cd "%CURRENT_DIR%"
    :gotHome
    
    if exist "%CATALINA_HOME%\bin\catalina.bat" goto okHome
    echo The CATALINA_HOME environment variable is not defined correctly
    echo This environment variable is needed to run this program
    goto end
    :okHome
    
    rem 以上代码和startup.bat内容很相似
    
    rem Copy CATALINA_BASE from CATALINA_HOME if not defined ,没有设置CATALINA_BASE的情况下，将CATALINA_HOME赋值给CATALINA_BASE
    if not "%CATALINA_BASE%" == "" goto gotBase
    set "CATALINA_BASE=%CATALINA_HOME%"
    :gotBase
    
    rem Ensure that any user defined CLASSPATH variables are not used on startup,
    rem but allow them to be specified in setenv.bat, in rare case when it is needed.
    set CLASSPATH=
    
    rem Get standard environment variables 我们在tomcat1.7下bin目录中不存在setenv.bat
    if not exist "%CATALINA_BASE%\bin\setenv.bat" goto checkSetenvHome
    call "%CATALINA_BASE%\bin\setenv.bat"
    goto setenvDone
    :checkSetenvHome
    if exist "%CATALINA_HOME%\bin\setenv.bat" call "%CATALINA_HOME%\bin\setenv.bat"
    :setenvDone
    
    rem Get standard Java environment variables 启动Java 设置环境变量，运行Java.exe等
    if exist "%CATALINA_HOME%\bin\setclasspath.bat" goto okSetclasspath
    echo Cannot find "%CATALINA_HOME%\bin\setclasspath.bat"
    echo This file is needed to run this program
    goto end
    :okSetclasspath
    call "%CATALINA_HOME%\bin\setclasspath.bat" %1
    if errorlevel 1 goto end
    
    rem Add on extra jar file to CLASSPATH
    rem Note that there are no quotes as we do not want to introduce random
    rem quotes into the CLASSPATH   设置tomcat的类路径bootstrap.jar
    if "%CLASSPATH%" == "" goto emptyClasspath
    set "CLASSPATH=%CLASSPATH%;"
    :emptyClasspath
    set "CLASSPATH=%CLASSPATH%%CATALINA_HOME%\bin\bootstrap.jar"
    
    if not "%CATALINA_TMPDIR%" == "" goto gotTmpdir
    set "CATALINA_TMPDIR=%CATALINA_BASE%\temp"
    :gotTmpdir
    
    rem Add tomcat-juli.jar to classpath 把tomcat-juli.jar包也加到CLASSPATH中
    rem tomcat-juli.jar can be over-ridden per instance 
    if not exist "%CATALINA_BASE%\bin\tomcat-juli.jar" goto juliClasspathHome
    set "CLASSPATH=%CLASSPATH%;%CATALINA_BASE%\bin\tomcat-juli.jar"
    goto juliClasspathDone
    :juliClasspathHome
    set "CLASSPATH=%CLASSPATH%;%CATALINA_HOME%\bin\tomcat-juli.jar"
    :juliClasspathDone
    
    rem 还不知道2048是什么意思 ：
    if not "%JSSE_OPTS%" == "" goto gotJsseOpts
    set JSSE_OPTS="-Djdk.tls.ephemeralDHKeySize=2048"
    :gotJsseOpts
    set "JAVA_OPTS=%JAVA_OPTS% %JSSE_OPTS%"
    
    rem 加载logging.properties配置信息
    if not "%LOGGING_CONFIG%" == "" goto noJuliConfig
    set LOGGING_CONFIG=-Dnop
    if not exist "%CATALINA_BASE%\conf\logging.properties" goto noJuliConfig
    set LOGGING_CONFIG=-Djava.util.logging.config.file="%CATALINA_BASE%\conf\logging.properties"
    :noJuliConfig
    
    rem 设置日志处理器
    if not "%LOGGING_MANAGER%" == "" goto noJuliManager
    set LOGGING_MANAGER=-Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
    :noJuliManager
    
    rem ----- Execute The Requested Command ---------------------------------------
    rem  打印获得环境以及配置信息
    echo Using CATALINA_BASE:   "%CATALINA_BASE%"
    echo Using CATALINA_HOME:   "%CATALINA_HOME%"
    echo Using CATALINA_TMPDIR: "%CATALINA_TMPDIR%"
    if ""%1"" == ""debug"" goto use_jdk
    echo Using JRE_HOME:        "%JRE_HOME%"
    goto java_dir_displayed
    :use_jdk
    echo Using JAVA_HOME:       "%JAVA_HOME%"
    :java_dir_displayed
    echo Using CLASSPATH:       "%CLASSPATH%"
    
    set _EXECJAVA=%_RUNJAVA%
    
    rem 设置启动类
    set MAINCLASS=org.apache.catalina.startup.Bootstrap
    set ACTION=start
    set SECURITY_POLICY_FILE=
    set DEBUG_OPTS=
    set JPDA=
    
    if not ""%1"" == ""jpda"" goto noJpda
    set JPDA=jpda
    if not "%JPDA_TRANSPORT%" == "" goto gotJpdaTransport
    set JPDA_TRANSPORT=dt_socket
    :gotJpdaTransport
    if not "%JPDA_ADDRESS%" == "" goto gotJpdaAddress
    set JPDA_ADDRESS=8000
    :gotJpdaAddress
    if not "%JPDA_SUSPEND%" == "" goto gotJpdaSuspend
    set JPDA_SUSPEND=n
    :gotJpdaSuspend
    if not "%JPDA_OPTS%" == "" goto gotJpdaOpts
    set JPDA_OPTS=-agentlib:jdwp=transport=%JPDA_TRANSPORT%,address=%JPDA_ADDRESS%,server=y,suspend=%JPDA_SUSPEND%
    :gotJpdaOpts
    shift
    :noJpda
    
    if ""%1"" == ""debug"" goto doDebug
    if ""%1"" == ""run"" goto doRun
    if ""%1"" == ""start"" goto doStart
    if ""%1"" == ""stop"" goto doStop
    if ""%1"" == ""configtest"" goto doConfigTest
    if ""%1"" == ""version"" goto doVersion
    
    echo Usage:  catalina ( commands ... )
    echo commands:
    echo   debug             Start Catalina in a debugger
    echo   debug -security   Debug Catalina with a security manager
    echo   jpda start        Start Catalina under JPDA debugger
    echo   run               Start Catalina in the current window
    echo   run -security     Start in the current window with security manager
    echo   start             Start Catalina in a separate window
    echo   start -security   Start in a separate window with security manager
    echo   stop              Stop Catalina
    echo   configtest        Run a basic syntax check on server.xml
    echo   version           What version of tomcat are you running?
    goto end
    
    rem  加载安全文件
    
    :doDebug
    shift
    set _EXECJAVA=%_RUNJDB%
    set DEBUG_OPTS=-sourcepath "%CATALINA_HOME%\..\..\java"
    if not ""%1"" == ""-security"" goto execCmd
    shift
    echo Using Security Manager
    set "SECURITY_POLICY_FILE=%CATALINA_BASE%\conf\catalina.policy"
    goto execCmd
    
    :doRun
    shift
    if not ""%1"" == ""-security"" goto execCmd
    shift
    echo Using Security Manager
    set "SECURITY_POLICY_FILE=%CATALINA_BASE%\conf\catalina.policy"
    goto execCmd
    
    :doStart
    shift
    if "%TITLE%" == "" set TITLE=Tomcat
    set _EXECJAVA=start "%TITLE%" %_RUNJAVA%
    if not ""%1"" == ""-security"" goto execCmd
    shift
    echo Using Security Manager
    set "SECURITY_POLICY_FILE=%CATALINA_BASE%\conf\catalina.policy"
    goto execCmd
    
    :doStop
    shift
    set ACTION=stop
    set CATALINA_OPTS=
    goto execCmd
    
    :doConfigTest
    shift
    set ACTION=configtest
    set CATALINA_OPTS=
    goto execCmd
    
    :doVersion
    %_EXECJAVA% -classpath "%CATALINA_HOME%\lib\catalina.jar" org.apache.catalina.util.ServerInfo
    goto end
    
    
    :execCmd
    rem Get remaining unshifted command line arguments and save them in the
    set CMD_LINE_ARGS=
    :setArgs
    if ""%1""=="""" goto doneSetArgs
    set CMD_LINE_ARGS=%CMD_LINE_ARGS% %1
    shift
    goto setArgs
    :doneSetArgs
    
    rem Execute Java with the applicable properties
    rem 启动main 函数，按参数配置的情况，决定按何种方式启动
    if not "%JPDA%" == "" goto doJpda
    if not "%SECURITY_POLICY_FILE%" == "" goto doSecurity
    %_EXECJAVA% %LOGGING_CONFIG% %LOGGING_MANAGER% %JAVA_OPTS% %CATALINA_OPTS% %DEBUG_OPTS% -Djava.endorsed.dirs="%JAVA_ENDORSED_DIRS%" -classpath "%CLASSPATH%" -Dcatalina.base="%CATALINA_BASE%" -Dcatalina.home="%CATALINA_HOME%" -Djava.io.tmpdir="%CATALINA_TMPDIR%" %MAINCLASS% %CMD_LINE_ARGS% %ACTION%
    goto end
    :doSecurity
    %_EXECJAVA% %LOGGING_CONFIG% %LOGGING_MANAGER% %JAVA_OPTS% %CATALINA_OPTS% %DEBUG_OPTS% -Djava.endorsed.dirs="%JAVA_ENDORSED_DIRS%" -classpath "%CLASSPATH%" -Djava.security.manager -Djava.security.policy=="%SECURITY_POLICY_FILE%" -Dcatalina.base="%CATALINA_BASE%" -Dcatalina.home="%CATALINA_HOME%" -Djava.io.tmpdir="%CATALINA_TMPDIR%" %MAINCLASS% %CMD_LINE_ARGS% %ACTION%
    goto end
    :doJpda
    if not "%SECURITY_POLICY_FILE%" == "" goto doSecurityJpda
    %_EXECJAVA% %LOGGING_CONFIG% %LOGGING_MANAGER% %JAVA_OPTS% %JPDA_OPTS% %CATALINA_OPTS% %DEBUG_OPTS% -Djava.endorsed.dirs="%JAVA_ENDORSED_DIRS%" -classpath "%CLASSPATH%" -Dcatalina.base="%CATALINA_BASE%" -Dcatalina.home="%CATALINA_HOME%" -Djava.io.tmpdir="%CATALINA_TMPDIR%" %MAINCLASS% %CMD_LINE_ARGS% %ACTION%
    goto end
    :doSecurityJpda
    %_EXECJAVA% %LOGGING_CONFIG% %LOGGING_MANAGER% %JAVA_OPTS% %JPDA_OPTS% %CATALINA_OPTS% %DEBUG_OPTS% -Djava.endorsed.dirs="%JAVA_ENDORSED_DIRS%" -classpath "%CLASSPATH%" -Djava.security.manager -Djava.security.policy=="%SECURITY_POLICY_FILE%" -Dcatalina.base="%CATALINA_BASE%" -Dcatalina.home="%CATALINA_HOME%" -Djava.io.tmpdir="%CATALINA_TMPDIR%" %MAINCLASS% %CMD_LINE_ARGS% %ACTION%
    goto end
    
    :end

**3. Bootstrap.jar中Bootstrap中的main()方法：**

public static void main(String[] args) {
            if (daemon == null) {
                Bootstrap bootstrap = new Bootstrap();
                try {
                    //对Bootstrap进行初始化
                    bootstrap.init();
                } catch (Throwable t) {
                    handleThrowable(t);
                    t.printStackTrace();
                    return;
                }
                daemon = bootstrap;
            } else {
                Thread.currentThread().setContextClassLoader(daemon.catalinaLoader);
            }
            try {
                //启动服务还是关停服务，有传入的命令行决定
                String command = "start";
                if (args.length > 0) {
                    command = args[(args.length - 1)];
                }
    
                if (command.equals("startd")) {
                    args[(args.length - 1)] = "start";
                    daemon.load(args);
                    daemon.start();
                } else if (command.equals("stopd")) {
                    args[(args.length - 1)] = "stop";
                    daemon.stop();
                } else if (command.equals("start")) {
                    daemon.setAwait(true);
                    daemon.load(args);
                    daemon.start();
                } else if (command.equals("stop")) {
                    daemon.stopServer(args);
                } else if (command.equals("configtest")) {
                    daemon.load(args);
                    if (null == daemon.getServer()) {
                        System.exit(1);
                    }
                    System.exit(0);
                } else {
                    log.warn(new StringBuilder().append("Bootstrap: command \"").append(command).append("\" does not exist.").toString());
                }
            } catch (Throwable t) {
                if (((t instanceof InvocationTargetException)) && (t.getCause() != null)) {
                    t = t.getCause();
                }
                handleThrowable(t);
                t.printStackTrace();
                System.exit(1);
            }
        }

到此tomcat启动流程1结束；后面的文章我将介绍，**Bootstrap中的main() 里面发生了什么！**