In the previous article, BootStarp started by running the main function directly, with a system property of Catalina. home added. Under normal circumstances, Tomcat is started by running scripts, which involves a pile of script files copied from the script directory when building the project.
Bat file
startup.bat :
1 @echo off 2 rem Licensed to the Apache Software Foundation (ASF) under one or more 3 rem contributor license agreements. See the NOTICE file distributed with 4 rem this work for additional information regarding copyright Ownership. 5 REM The ASF licenses this file to You under The Apache License, Version 2.0 6 REM (The "License"); you may not use this file except in compliance with 7 rem the License. You may obtain a copy of the License at 8 rem 9 Rem http://www.apache.org/licenses/LICENSE-2.0 10 rem 11 rem Unless required by applicable law or agreed to in writing, software 12 rem distributed under the License is distributed on an "AS IS" BASIS, 13 rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 rem See the License for the specific language governing permissions and 15 rem limitations under the License. 16 17 if "%OS%" == "Windows_NT" setlocal 18 rem --------------------------------------------------------------------------- 19 rem Start script for the CATALINA Server 20 rem 21 rem $Id: startup.bat 895392 2010-01-03 14:02:31Z kkolinko $ 22 rem --------------------------------------------------------------------------- 23 24 rem Guess CATALINA_HOME if not defined 25 set "CURRENT_DIR=%cd%" 26 if not "%CATALINA_HOME%" == "" goto gotHome 27 set "CATALINA_HOME=%CURRENT_DIR%" 28 if exist "%CATALINA_HOME%\bin\catalina.bat" goto okHome 29 cd .. 30 set "CATALINA_HOME=%cd%" 31 cd "%CURRENT_DIR%" 32 :gotHome 33 if exist "%CATALINA_HOME%\bin\catalina.bat" goto okHome 34 echo The CATALINA_HOME environment variable is not defined correctly 35 echo This environment variable is needed to run this program 36 goto end 37 :okHome 38 39 set "EXECUTABLE=%CATALINA_HOME%\bin\catalina.bat" 40 41 rem Check that target executable exists 42 if exist "%EXECUTABLE%" goto okExec 43 echo Cannot find "%EXECUTABLE%" 44 echo This file is needed to run this program 45 goto end 46 :okExec 47 48 rem Get remaining unshifted command line arguments and save them in the 49 set CMD_LINE_ARGS= 50 :setArgs 51 if ""%1""=="""" goto doneSetArgs 52 set CMD_LINE_ARGS=%CMD_LINE_ARGS% %1 53 shift 54 goto setArgs 55 :doneSetArgs 56 57 call "%EXECUTABLE%" start %CMD_LINE_ARGS% 58 59 :endCopy the codeLine 17 if “%OS%” == “Windows_NT” setlocal is to temporarily modify system variables for batch operation. Lines 26 through 33 set the CATALINA_HOME environment variable. If it is not set on the operating system, the directory where the script is currently running will be used as the value of the environment variable, and eventually line 37 will be skipped. Lines 39 to 46 verify that the catalina.bat file in the directory shown in the CATALINA_HOME variable exists. If it does not, the batch process ends. If you set additional parameters before running the script at lines 48 to 55, save them in the CMD_LINE_ARGS variable. Finally, line 57 executes the catalina.bat batch file. Note that this line is followed by two arguments, the first of which is start.
2. Analyze catalina.bat files
1 @echo off
2 rem Licensed to the Apache Software Foundation (ASF) under one or more
3 rem contributor license agreements. See the NOTICE file distributed with
4 rem this work for additional information regarding copyright ownership.
5 rem The ASF licenses this file to You under the Apache License, Version 2.0
6 rem (the "License"); you may not use this file except in compliance with
7 rem the License. You may obtain a copy of the License at
8 rem
9 rem http://www.apache.org/licenses/LICENSE-2.0
10 rem
11 rem Unless required by applicable law or agreed to in writing, software
12 rem distributed under the License is distributed on an "AS IS" BASIS,
13 rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 rem See the License for the specific language governing permissions and
15 rem limitations under the License.
16
17 if "%OS%" == "Windows_NT" setlocal
18 rem ---------------------------------------------------------------------------
19 rem Start/Stop Script for the CATALINA Server
20 rem
21 rem Environment Variable Prerequisites
22 rem
23 rem Do not set the variables in this script. Instead put them into a script
24 rem setenv.bat in CATALINA_BASE/bin to keep your customizations separate.
25 rem
26 rem CATALINA_HOME May point at your Catalina "build" directory.
27 rem
28 rem CATALINA_BASE (Optional) Base directory for resolving dynamic portions
29 rem of a Catalina installation. If not present, resolves to
30 rem the same directory that CATALINA_HOME points to.
31 rem
32 rem CATALINA_OPTS (Optional) Java runtime options used when the "start",
33 rem "run" or "debug" command is executed.
34 rem Include here and not in JAVA_OPTS all options, that should
35 rem only be used by Tomcat itself, not by the stop process,
36 rem the version command etc.
37 rem Examples are heap size, GC logging, JMX ports etc.
38 rem
39 rem CATALINA_TMPDIR (Optional) Directory path location of temporary directory
40 rem the JVM should use (java.io.tmpdir). Defaults to
41 rem %CATALINA_BASE%\temp.
42 rem
43 rem JAVA_HOME Must point at your Java Development Kit installation.
44 rem Required to run the with the "debug" argument.
45 rem
46 rem JRE_HOME Must point at your Java Runtime installation.
47 rem Defaults to JAVA_HOME if empty. If JRE_HOME and JAVA_HOME
48 rem are both set, JRE_HOME is used.
49 rem
50 rem JAVA_OPTS (Optional) Java runtime options used when any command
51 rem is executed.
52 rem Include here and not in CATALINA_OPTS all options, that
53 rem should be used by Tomcat and also by the stop process,
54 rem the version command etc.
55 rem Most options should go into CATALINA_OPTS.
56 rem
57 rem JAVA_ENDORSED_DIRS (Optional) Lists of of semi-colon separated directories
58 rem containing some jars in order to allow replacement of APIs
59 rem created outside of the JCP (i.e. DOM and SAX from W3C).
60 rem It can also be used to update the XML parser implementation.
61 rem Defaults to $CATALINA_HOME/endorsed.
62 rem
63 rem JPDA_TRANSPORT (Optional) JPDA transport used when the "jpda start"
64 rem command is executed. The default is "dt_socket".
65 rem
66 rem JPDA_ADDRESS (Optional) Java runtime options used when the "jpda start"
67 rem command is executed. The default is 8000.
68 rem
69 rem JPDA_SUSPEND (Optional) Java runtime options used when the "jpda start"
70 rem command is executed. Specifies whether JVM should suspend
71 rem execution immediately after startup. Default is "n".
72 rem
73 rem JPDA_OPTS (Optional) Java runtime options used when the "jpda start"
74 rem command is executed. If used, JPDA_TRANSPORT, JPDA_ADDRESS,
75 rem and JPDA_SUSPEND are ignored. Thus, all required jpda
76 rem options MUST be specified. The default is:
77 rem
78 rem -agentlib:jdwp=transport=%JPDA_TRANSPORT%,
79 rem address=%JPDA_ADDRESS%,server=y,suspend=%JPDA_SUSPEND%
80 rem
81 rem LOGGING_CONFIG (Optional) Override Tomcat's logging config file
82 rem Example (all one line)
83 rem set LOGGING_CONFIG="-Djava.util.logging.config.file=%CATALINA_BASE%\conf\logging.properties"
84 rem
85 rem LOGGING_MANAGER (Optional) Override Tomcat's logging manager
86 rem Example (all one line)
87 rem set LOGGING_MANAGER="-Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager"
88 rem
89 rem TITLE (Optional) Specify the title of Tomcat window. The default
90 rem TITLE is Tomcat if it's not specified.
91 rem Example (all one line)
92 rem set TITLE=Tomcat.Cluster#1.Server#1 [%DATE% %TIME%]
93 rem
94 rem
95 rem
96 rem $Id: catalina.bat 1344732 2012-05-31 14:08:02Z kkolinko $
97 rem ---------------------------------------------------------------------------
98
99 rem Suppress Terminate batch job on CTRL+C
100 if not ""%1"" == ""run"" goto mainEntry
101 if "%TEMP%" == "" goto mainEntry
102 if exist "%TEMP%\%~nx0.run" goto mainEntry
103 echo Y>"%TEMP%\%~nx0.run"
104 if not exist "%TEMP%\%~nx0.run" goto mainEntry
105 echo Y>"%TEMP%\%~nx0.Y"
106 call "%~f0" %* <"%TEMP%\%~nx0.Y"
107 rem Use provided errorlevel
108 set RETVAL=%ERRORLEVEL%
109 del /Q "%TEMP%\%~nx0.Y" >NUL 2>&1
110 exit /B %RETVAL%
111 :mainEntry
112 del /Q "%TEMP%\%~nx0.run" >NUL 2>&1
113
114 rem Guess CATALINA_HOME if not defined
115 set "CURRENT_DIR=%cd%"
116 if not "%CATALINA_HOME%" == "" goto gotHome
117 set "CATALINA_HOME=%CURRENT_DIR%"
118 if exist "%CATALINA_HOME%\bin\catalina.bat" goto okHome
119 cd ..
120 set "CATALINA_HOME=%cd%"
121 cd "%CURRENT_DIR%"
122 :gotHome
123
124 if exist "%CATALINA_HOME%\bin\catalina.bat" goto okHome
125 echo The CATALINA_HOME environment variable is not defined correctly
126 echo This environment variable is needed to run this program
127 goto end
128 :okHome
129
130 rem Copy CATALINA_BASE from CATALINA_HOME if not defined
131 if not "%CATALINA_BASE%" == "" goto gotBase
132 set "CATALINA_BASE=%CATALINA_HOME%"
133 :gotBase
134
135 rem Ensure that any user defined CLASSPATH variables are not used on startup,
136 rem but allow them to be specified in setenv.bat, in rare case when it is needed.
137 set CLASSPATH=
138
139 rem Get standard environment variables
140 if not exist "%CATALINA_BASE%\bin\setenv.bat" goto checkSetenvHome
141 call "%CATALINA_BASE%\bin\setenv.bat"
142 goto setenvDone
143 :checkSetenvHome
144 if exist "%CATALINA_HOME%\bin\setenv.bat" call "%CATALINA_HOME%\bin\setenv.bat"
145 :setenvDone
146
147 rem Get standard Java environment variables
148 if exist "%CATALINA_HOME%\bin\setclasspath.bat" goto okSetclasspath
149 echo Cannot find "%CATALINA_HOME%\bin\setclasspath.bat"
150 echo This file is needed to run this program
151 goto end
152 :okSetclasspath
153 call "%CATALINA_HOME%\bin\setclasspath.bat" %1
154 if errorlevel 1 goto end
155
156 rem Add on extra jar file to CLASSPATH
157 rem Note that there are no quotes as we do not want to introduce random
158 rem quotes into the CLASSPATH
159 if "%CLASSPATH%" == "" goto emptyClasspath
160 set "CLASSPATH=%CLASSPATH%;"
161 :emptyClasspath
162 set "CLASSPATH=%CLASSPATH%%CATALINA_HOME%\bin\bootstrap.jar"
163
164 if not "%CATALINA_TMPDIR%" == "" goto gotTmpdir
165 set "CATALINA_TMPDIR=%CATALINA_BASE%\temp"
166 :gotTmpdir
167
168 rem Add tomcat-juli.jar to classpath
169 rem tomcat-juli.jar can be over-ridden per instance
170 if not exist "%CATALINA_BASE%\bin\tomcat-juli.jar" goto juliClasspathHome
171 set "CLASSPATH=%CLASSPATH%;%CATALINA_BASE%\bin\tomcat-juli.jar"
172 goto juliClasspathDone
173 :juliClasspathHome
174 set "CLASSPATH=%CLASSPATH%;%CATALINA_HOME%\bin\tomcat-juli.jar"
175 :juliClasspathDone
176
177 if not "%LOGGING_CONFIG%" == "" goto noJuliConfig
178 set LOGGING_CONFIG=-Dnop
179 if not exist "%CATALINA_BASE%\conf\logging.properties" goto noJuliConfig
180 set LOGGING_CONFIG=-Djava.util.logging.config.file="%CATALINA_BASE%\conf\logging.properties"
181 :noJuliConfig
182 set JAVA_OPTS=%JAVA_OPTS% %LOGGING_CONFIG%
183
184 if not "%LOGGING_MANAGER%" == "" goto noJuliManager
185 set LOGGING_MANAGER=-Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
186 :noJuliManager
187 set JAVA_OPTS=%JAVA_OPTS% %LOGGING_MANAGER%
188
189 rem ----- Execute The Requested Command ---------------------------------------
190
191 echo Using CATALINA_BASE: "%CATALINA_BASE%"
192 echo Using CATALINA_HOME: "%CATALINA_HOME%"
193 echo Using CATALINA_TMPDIR: "%CATALINA_TMPDIR%"
194 if ""%1"" == ""debug"" goto use_jdk
195 echo Using JRE_HOME: "%JRE_HOME%"
196 goto java_dir_displayed
197 :use_jdk
198 echo Using JAVA_HOME: "%JAVA_HOME%"
199 :java_dir_displayed
200 echo Using CLASSPATH: "%CLASSPATH%"
201
202 set _EXECJAVA=%_RUNJAVA%
203 set MAINCLASS=org.apache.catalina.startup.Bootstrap
204 set ACTION=start
205 set SECURITY_POLICY_FILE=
206 set DEBUG_OPTS=
207 set JPDA=
208
209 if not ""%1"" == ""jpda"" goto noJpda
210 set JPDA=jpda
211 if not "%JPDA_TRANSPORT%" == "" goto gotJpdaTransport
212 set JPDA_TRANSPORT=dt_socket
213 :gotJpdaTransport
214 if not "%JPDA_ADDRESS%" == "" goto gotJpdaAddress
215 set JPDA_ADDRESS=8000
216 :gotJpdaAddress
217 if not "%JPDA_SUSPEND%" == "" goto gotJpdaSuspend
218 set JPDA_SUSPEND=n
219 :gotJpdaSuspend
220 if not "%JPDA_OPTS%" == "" goto gotJpdaOpts
221 set JPDA_OPTS=-agentlib:jdwp=transport=%JPDA_TRANSPORT%,address=%JPDA_ADDRESS%,server=y,suspend=%JPDA_SUSPEND%
222 :gotJpdaOpts
223 shift
224 :noJpda
225
226 if ""%1"" == ""debug"" goto doDebug
227 if ""%1"" == ""run"" goto doRun
228 if ""%1"" == ""start"" goto doStart
229 if ""%1"" == ""stop"" goto doStop
230 if ""%1"" == ""configtest"" goto doConfigTest
231 if ""%1"" == ""version"" goto doVersion
232
233 echo Usage: catalina ( commands ... )
234 echo commands:
235 echo debug Start Catalina in a debugger
236 echo debug -security Debug Catalina with a security manager
237 echo jpda start Start Catalina under JPDA debugger
238 echo run Start Catalina in the current window
239 echo run -security Start in the current window with security manager
240 echo start Start Catalina in a separate window
241 echo start -security Start in a separate window with security manager
242 echo stop Stop Catalina
243 echo configtest Run a basic syntax check on server.xml
244 echo version What version of tomcat are you running?
245 goto end
246
247 :doDebug
248 shift
249 set _EXECJAVA=%_RUNJDB%
250 set DEBUG_OPTS=-sourcepath "%CATALINA_HOME%\..\..\java"
251 if not ""%1"" == ""-security"" goto execCmd
252 shift
253 echo Using Security Manager
254 set "SECURITY_POLICY_FILE=%CATALINA_BASE%\conf\catalina.policy"
255 goto execCmd
256
257 :doRun
258 shift
259 if not ""%1"" == ""-security"" goto execCmd
260 shift
261 echo Using Security Manager
262 set "SECURITY_POLICY_FILE=%CATALINA_BASE%\conf\catalina.policy"
263 goto execCmd
264
265 :doStart
266 shift
267 if not "%OS%" == "Windows_NT" goto noTitle
268 if "%TITLE%" == "" set TITLE=Tomcat
269 set _EXECJAVA=start "%TITLE%" %_RUNJAVA%
270 goto gotTitle
271 :noTitle
272 set _EXECJAVA=start %_RUNJAVA%
273 :gotTitle
274 if not ""%1"" == ""-security"" goto execCmd
275 shift
276 echo Using Security Manager
277 set "SECURITY_POLICY_FILE=%CATALINA_BASE%\conf\catalina.policy"
278 goto execCmd
279
280 :doStop
281 shift
282 set ACTION=stop
283 set CATALINA_OPTS=
284 goto execCmd
285
286 :doConfigTest
287 shift
288 set ACTION=configtest
289 set CATALINA_OPTS=
290 goto execCmd
291
292 :doVersion
293 %_EXECJAVA% -classpath "%CATALINA_HOME%\lib\catalina.jar" org.apache.catalina.util.ServerInfo
294 goto end
295
296
297 :execCmd
298 rem Get remaining unshifted command line arguments and save them in the
299 set CMD_LINE_ARGS=
300 :setArgs
301 if ""%1""=="""" goto doneSetArgs
302 set CMD_LINE_ARGS=%CMD_LINE_ARGS% %1
303 shift
304 goto setArgs
305 :doneSetArgs
306
307 rem Execute Java with the applicable properties
308 if not "%JPDA%" == "" goto doJpda
309 if not "%SECURITY_POLICY_FILE%" == "" goto doSecurity
310 %_EXECJAVA% %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%
311 goto end
312 :doSecurity
313 %_EXECJAVA% %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%
314 goto end
315 :doJpda
316 if not "%SECURITY_POLICY_FILE%" == "" goto doSecurityJpda
317 %_EXECJAVA% %JAVA_OPTS% %CATALINA_OPTS% %JPDA_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%
318 goto end
319 :doSecurityJpda
320 %_EXECJAVA% %JAVA_OPTS% %CATALINA_OPTS% %JPDA_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%
321 goto end
322
323 :end
Copy the codeLines 1 to 99 are a bunch of comments, and lines 100 to 110 are a bunch of run files, so I’m just going to skip to line 111, delete any intermediate files that might be generated, and follow the normal process, In the above startup. Bat file has already set the CATALINA_HOME variables, and check the quantity change bin \ catalina. Bat file already exists (I guess the author write this paragraph is to prevent the user run directly catalina. Bat file). Set CATALINA_BASE on lines 130 to 133. Skip the comments on the middle lines. Execute the setenv.bat file if it exists on lines 139 to 144. Lines 147 to 153 execute the setclasspath. Bat file (this file is provided in the same directory, the script is posted below, you can read it, I won’t analyze it here. Check whether the JAVA_HOME variable is set. If not, a message is displayed on the console. Notice that line 79 sets the _RUNJAVA variable, whose value is the java.exe file in the bin directory of JAVA_HOME or JRE_HOME). Check and set a bunch of variables from lines 156 through 224 (note lines 202, 203, and 204, which will be used when you finally start the analysis). Lines 226 to 231 will jump to the doStart tag line based on the parameters set when catalina.bat is called, as explained at the end of the previous paragraph. Starting at line 265, after the checksum sets some variables (note line 269) it jumps to the execCmd tag line, which is line 297. Lines 297 to 305 save system parameters to the CMD_LINE_ARGS variable.
Next comes the answer to the riddle, which normally runs to 310 lines. Here’s a separate post for analysis: %_EXECJAVA% %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% As prompted on line 202, _EXECJAVA started with a value equal to _RUNJAVA, but changed to start “%TITLE%” %_RUNJAVA% on line 269, The effect here is to launch another command line window, give the window a name, and finally execute the java.exe file. From before starting to MAINCLASS % % % JAVA_OPTS % is in setting up the runtime parameters and system properties, MAINCLASS % % 203 lines of org. The apache. Catalina. Startup. The Bootstrap, followed by other command line arguments, The last parameter, %ACTION%, is set to start at line 204. In short, execute the main method of the Bootstrap class.
setclasspath.bat:
1 @echo off 2 rem Licensed to the Apache Software Foundation (ASF) under one or more 3 rem contributor license agreements. See the NOTICE file distributed with 4 rem this work for additional information regarding copyright Ownership. 5 REM The ASF licenses this file to You under The Apache License, Version 2.0 6 REM (The "License"); you may not use this file except in compliance with 7 rem the License. You may obtain a copy of the License at 8 rem 9 Rem http://www.apache.org/licenses/LICENSE-2.0 10 rem 11 rem Unless required by applicable law or agreed to in writing, software 12 rem distributed under the License is distributed on an "AS IS" BASIS, 13 rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 rem See the License for the specific language governing permissions and 15 rem limitations under the License. 16 17 rem --------------------------------------------------------------------------- 18 rem Set JAVA_HOME or JRE_HOME if not already set, ensure any provided settings 19 rem are valid and consistent with the selected start-up options and set up the 20 rem endorsed directory. 21 rem 22 rem $Id: setclasspath.bat 1202062 2011-11-15 06:50:02Z mturk $ 23 rem --------------------------------------------------------------------------- 24 25 rem Make sure prerequisite environment variables are set 26 27 rem In debug mode we need a real JDK (JAVA_HOME) 28 if ""%1"" == ""debug"" goto needJavaHome 29 30 rem Otherwise either JRE or JDK are fine 31 if not "%JRE_HOME%" == "" goto gotJreHome 32 if not "%JAVA_HOME%" == "" goto gotJavaHome 33 echo Neither the JAVA_HOME nor the JRE_HOME environment variable is defined 34 echo At least one of these environment variable is needed to run this program 35 goto exit 36 37 :needJavaHome 38 rem Check if we have a usable JDK 39 if "%JAVA_HOME%" == "" goto noJavaHome 40 if not exist "%JAVA_HOME%\bin\java.exe" goto noJavaHome 41 if not exist "%JAVA_HOME%\bin\javaw.exe" goto noJavaHome 42 if not exist "%JAVA_HOME%\bin\jdb.exe" goto noJavaHome 43 if not exist "%JAVA_HOME%\bin\javac.exe" goto noJavaHome 44 set "JRE_HOME=%JAVA_HOME%" 45 goto okJava 46 47 :noJavaHome 48 echo The JAVA_HOME environment variable is not defined correctly. 49 echo It is needed to run this program in debug mode. 50 echo NB: JAVA_HOME should point to a JDK not a JRE. 51 goto exit 52 53 :gotJavaHome 54 rem No JRE given, use JAVA_HOME as JRE_HOME 55 set "JRE_HOME=%JAVA_HOME%" 56 57 :gotJreHome 58 rem Check if we have a usable JRE 59 if not exist "%JRE_HOME%\bin\java.exe" goto noJreHome 60 if not exist "%JRE_HOME%\bin\javaw.exe" goto noJreHome 61 goto okJava 62 63 :noJreHome 64 rem Needed at least a JRE 65 echo The JRE_HOME environment variable is not defined correctly 66 echo This environment variable is needed to run this program 67 goto exit 68 69 :okJava 70 rem Don't override the endorsed dir if the user has set it previously 71 if not "%JAVA_ENDORSED_DIRS%" == "" goto gotEndorseddir 72 rem Set the default -Djava.endorsed.dirs argument 73 set "JAVA_ENDORSED_DIRS=%CATALINA_HOME%\endorsed" 74 :gotEndorseddir 75 76 rem Set standard command for invoking Java. 77 rem Note that NT requires a window name argument when using start. 78 rem Also note the quoting as JAVA_HOME may contain spaces. 79 set _RUNJAVA="%JRE_HOME%\bin\java" 80 set _RUNJDB="%JAVA_HOME%\bin\jdb" 81 82 goto end 83 84 :exit 85 exit /b 1 86 87 :end 88 exit /b 0Copy the codeThird, summary
You can run tomcat in different ways according to different parameters in Catalina.bat:
debug Start Catalina in a debugger
debug -security Debug Catalina with a security manager
jpda start Start Catalina under JPDA debugger
run Start Catalina in the current window
run -security Start in the current window with security manager
start Start Catalina in a separate window
start -security Start in a separate window with security manager
stop Stop Catalina
configtest Run a basic syntax check on server.xml
Copy the codeAs long as you can understand basic DOS commands, these scripts are actually easy to read. If you can browse through other BAT files, you will find that catalina.bat files will be executed after a long time. In catalina.bat, the main method of the Bootstrap file is executed. The difference is that the main method is called with different input parameters. The bat file is used to start Tomcat in Windows, and the sh file is used to start Tomcat in Unix. The principles are the same.