如何更改TOMCAT使用的Java版本？ [英] How to change Java version used by TOMCAT?

问题描述

我的系统上安装了Java 1.6和Tomcat 5.5。

I have Java 1.6 and Tomcat 5.5 installed on my system.

但Tomcat 5.5访问Java 1.5，因此结果我收到错误使用JSP执行java代码时.class文件中的错误版本号。

But Tomcat 5.5 accesses Java 1.5 and hence as the outcome I get the error Bad version number in .class file while executing java code with JSP.

如何将Tomcat版本更改为Java 1.6？

How can I change the Tomcat version to Java 1.6?

UPDATE

我尝试更改tomcat5w.exe指向的JVM版本1.6，现在我超出了.class文件错误中的 Bad版本。但现在，我收到以下错误。

I tried changing the JVM that the tomcat5w.exe is pointing to the version 1.6 and now I am out of the Bad version in .class file error. But now, I get the following error.

exception

org.apache.jasper.JasperException
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:498)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:411)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:308)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:259)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)

root cause

java.lang.NullPointerException
myfirst.SearchLink.checkURL(SearchLink.java:20)
org.apache.jsp.Test_jsp._jspService(Test_jsp.java:52)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:369)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:308)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:259)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)

可能是根本原因？

推荐答案

当你打开catalina.sh / catalina.bat，你可以看到：

When you open catalina.sh / catalina.bat, you can see :

环境变量先决条件

Environment Variable Prequisites

JAVA_HOME必须指向Java Development Kit安装。

JAVA_HOME Must point at your Java Development Kit installation.

因此，设置环境变量 JAVA_HOME 指向Java 6.同时确保 JRE_HOME 指向同一目标（如果已设置）。

So, set your environment variable JAVA_HOME to point to Java 6. Also make sure JRE_HOME is pointing to the same target, if it is set.

更新：因为您在Windows上，请参阅此处了解如何管理您的环境变量

Update: since you are on Windows, see here for how to manage your environment variables

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