在XP上明明已经安装了JDK1.5并设置好了JAVA_HOME,可偏偏Tomcat在启动过程中找不到。

　　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 FilesJavajdk1.5.0_05

　　set JRE_HOME=C:Program FilesJavajre1.5.0_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

　　:gotJreHome

　　if not exist "%JRE_HOME%binjava.exe" goto noJavaHome

　　if not exist "%JRE_HOME%binjavaw.exe" goto noJavaHome

　　if not ""%1"" == ""debug"" goto okJavaHome

　　echo JAVA_HOME should point to a JDK in order to run in debug mode.

　　goto exit

　　:gotJdkHome

　　if not exist "%JAVA_HOME%binjava.exe" goto noJavaHome

　　if not exist "%JAVA_HOME%binjavaw.exe" goto noJavaHome

　　if not exist "%JAVA_HOME%binjdb.exe" goto noJavaHome

　　if not exist "%JAVA_HOME%binjavac.exe" goto noJavaHome

　　if not "%JRE_HOME%" == "" goto okJavaHome

　　set JRE_HOME=%JAVA_HOME%

　　goto okJavaHome

　　:noJavaHome

　　echo The JAVA_HOME environment variable is not defined correctly

　　echo This environment variable is needed to run this program

　　echo NB: JAVA_HOME should point to a JDK not a JRE

　　goto exit

　　:okJavaHome

　　if not "?SEDIR%" == "" goto gotBasedir

　　echo The BASEDIR environment variable is not defined

　　echo This environment variable is needed to run this program

　　goto exit

　　:gotBasedir

　　if exist "?SEDIR%binsetclasspath.bat" goto okBasedir

　　echo The BASEDIR environment variable is not defined correctly

　　echo This environment variable is needed to run this program

　　goto exit

　　:okBasedir

　　rem Set the default -Djava.endorsed.dirs argument

　　set JAVA_ENDORSED_DIRS=?SEDIR%endorsed

　　rem Set standard CLASSPATH

　　rem Note that there are no quotes as we do not want to introduce random

　　rem quotes into the CLASSPATH

　　if not exist "%JAVA_HOME%bintools.jar" goto noJavac

　　set CLASSPATH=%JAVA_HOME%libtools.jar

　　:noJavac

　　rem Set standard command for invoking Java.

　　rem Note that NT requires a window name argument when using start.

　　rem Also note the quoting as JAVA_HOME may contain spaces.

　　set _RUNJAVA="%JRE_HOME%binjava"

　　set _RUNJAVAW="%JRE_HOME%binjavaw"

　　set _RUNJDB="%JAVA_HOME%binjdb"

　　set _RUNJAVAC="%JAVA_HOME%binjavac"

　　goto end

　　:exit

　　exit /b 1

　　:end

　　3、重启tomcat,敲入http://localhost:8080验证，问题解决。

　　tomcat5需要jdk1.6做支撑，jdk1.5不能够。