解决安装tomcat时出现的问题

容光焕发

在win10安装了JDK8并配置好了相关路径，在Tomcat在启动过程中出现startup.bat时闪退。

找出问题的原因

右键编辑打开“startup.bat"文件，然后找文件的最后一行代码是:end 在:end的后面输入pause
如下图所示：

接下来在DOS命令窗口运行startup.bat
此时提示报错信息如下：

1. the JRE_HOME environment variable is not defined correctly This environment variabl

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原因知道了，下面来看解决办法

1、分析startup.bat启动脚本：发现其调用了catalina.bat,而catalina.bat调用了setclasspath.bat
2、在setclasspath.bat的头部定义了JAVA_HOME和JRE_HOME的值，那么这里需要我们手动设置JAVA_HOME变量和JRE_HOME变量（红色代码为新添加
注意：你所设置的变量要和自己的电脑中”环境变量“里的JAVA_HOME和JRE_HOME保持一致，我的是红色的代码。
第一还是配错了路径，是应为环境变量中JRE_HOME的问题。
错把jre的绝对路径放在JAVA_HOME中了。
把JAVA_HOME中的jre的绝对路径删除掉。
重新建一个JRE_HOME，并且加入jre的绝对路径。
改完后就如下：

1. @echo offrem Licensed to the Apache Software Foundation (ASF) under one or morerem contributor license agreements. See the NOTICE file distributed withrem this work for additional information regarding copyright ownership.rem The ASF licenses this file to You under the Apache License, Version 2.0rem (the “License”); you may not use this file except in compliance withrem the License. You may obtain a copy of the License atremrem http://www.apache.org/licenses/LICENSE-2.0remrem Unless required by applicable law or agreed to in writing, softwarerem 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 andrem limitations under the License.
   
2. rem ---------------------------------------------------------------------------rem Set JAVA_HOME or JRE_HOME if not already set, ensure any provided settingsrem are valid and consistent with the selected start-up options and set up therem endorsed directory.rem ---------------------------------------------------------------------------

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set JAVA_HOME=D:\D:\tomcat\apache-tomcat-8.5.43
set JRE_HOME= C:\Program Files\Java\jre-9.0.4

1. rem Make sure prerequisite environment variables are set
   
2. rem In debug mode we need a real JDK (JAVA_HOME)if “”%1"" == ““debug”” goto needJavaHome
   
3. rem Otherwise either JRE or JDK are fineif not “%JRE_HOME%” == “” goto gotJreHomeif not “%JAVA_HOME%” == “” goto gotJavaHomeecho Neither the JAVA_HOME nor the JRE_HOME environment variable is definedecho At least one of these environment variable is needed to run this programgoto exit
   
4. :needJavaHomerem Check if we have a usable JDKif “%JAVA_HOME%” == “” goto noJavaHomeif not exist “%JAVA_HOME%\bin\java.exe” goto noJavaHomeif not exist “%JAVA_HOME%\bin\javaw.exe” goto noJavaHomeif not exist “%JAVA_HOME%\bin\jdb.exe” goto noJavaHomeif not exist “%JAVA_HOME%\bin\javac.exe” goto noJavaHomeset “JRE_HOME=%JAVA_HOME%”goto okJava
   
5. :noJavaHomeecho The JAVA_HOME environment variable is not defined correctly.echo It is needed to run this program in debug mode.echo NB: JAVA_HOME should point to a JDK not a JRE.goto exit
   
6. :gotJavaHomerem No JRE given, use JAVA_HOME as JRE_HOMEset “JRE_HOME=%JAVA_HOME%”
   
7. :gotJreHomerem Check if we have a usable JREif not exist “%JRE_HOME%\bin\java.exe” goto noJreHomeif not exist “%JRE_HOME%\bin\javaw.exe” goto noJreHomegoto okJava
   
8. :noJreHomerem Needed at least a JREecho The JRE_HOME environment variable is not defined correctlyecho This environment variable is needed to run this programgoto exit
   
9. :okJavarem Don’t override the endorsed dir if the user has set it previouslyif not “%JAVA_ENDORSED_DIRS%” == “” goto gotEndorseddirrem Set the default -Djava.endorsed.dirs argumentset “JAVA_ENDORSED_DIRS=%CATALINA_HOME%\endorsed”:gotEndorseddir
   
10. rem Don’t override _RUNJAVA if the user has set it previouslyif not “%_RUNJAVA%” == “” goto gotRunJavarem Set standard command for invoking Java.rem Also note the quoting as JRE_HOME may contain spaces.set _RUNJAVA="%JRE_HOME%\bin\java.exe":gotRunJava
    
11. rem Don’t override _RUNJDB if the user has set it previouslyrem Also note the quoting as JAVA_HOME may contain spaces.if not “%_RUNJDB%” == “” goto gotRunJdbset _RUNJDB="%JAVA_HOME%\bin\jdb.exe":gotRunJdb
    
12. goto end
    
13. :exitexit /b 1
    
14. :endexit /b 0

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添加变量后保存，并关闭文件，重新启动tomcat，然后在点击startup.bat，看到下面这样就说明OK了

如果是启动后再次启动出现问题，可能是你没有关闭之前启动的，造成8080端口占
有两种方案：
1.在startup.bat 同级目录中，按 shutdown.bat 关闭 （建议用此方法）
2.Tomcat服务器的配置文件，全部都在tomcat的安装目录下conf目录下：修改tomcat的端口为9090修改完server.xml文件必须重启服务器才能有效。
通过浏览器的地址栏访问测试：http://localhost:9090

总结

以上为个人经验，希望能给大家一个参考，也希望大家多多支持脚本之家。

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