tomcat一闪而过无法启动

报错信息如下：Neither the JAVA_HOME nor the JRE_HOME environment variable is defined At least one of these environment variable is needed to run this program;提示找不到java_home各jre_home路径，何解？

   原因不知道了，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，那么在这里手动设置JAVA_HOME变量

rem ---------------------------------------------------------------------------
rem Set CLASSPATH and Java options
rem
rem $Id: setclasspath.bat 505241 2007-02-09 10:22:58Z jfclere $
rem ---------------------------------------------------------------------------

set JAVA_HOME=C:\Program Files\Java\jdk1.5.0_05
set JRE_HOME=C:\Program Files\Java\jre1.5.0_05

rem Make sure prerequisite environment variables are set
if not "%JAVA_HOME%" == "" goto gotJdkHome
if not "%JRE_HOME%" == "" goto gotJreHome
echo Neither the JAVA_HOME nor the JRE_HOME environment variable is defined
echo At least one of these environment variable is needed to run this program
goto exit

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