Perhaps JAVA_HOME does not point to the JDK问题

错误页面提示：

HTTP Status 500 - type Exception report message description The server encountered an internal error () that prevented it from fulfilling this request. exception org.apache.jasper.JasperException: Unable to compile class for JSP   No Java compiler was found to compile the generated source for the JSP. This can usually be solved by copying manually $JAVA_HOME/lib/tools.jar from the JDK to the common/lib directory of the Tomcat server, followed by a Tomcat restart. If using an alternate Java compiler, please check its installation and access path.             org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:83)           org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:315)           org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:406)           org.apache.jasper.compiler.Compiler.compile(Compiler.java:463)           org.apache.jasper.compiler.Compiler.compile(Compiler.java:442)           org.apache.jasper.compiler.Compiler.compile(Compiler.java:430)           org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:511)           org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:274)           org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)           org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)           javax.servlet.http.HttpServlet.service(HttpServlet.java:810)

Perhaps JAVA_HOME does not point to the JDK问题

Unable to find a javac compiler;Perhaps JAVA_HOME does not point to the JDK异常产生原因和解决方法。 安装tomcat的时候指定了jre的路径，导致tomcat_home, java_home都已经添加到了环境变量里，但启动jsp的时候却出现了以下的异常： Unable to find a javac compiler; com.sun.tools.javac.Main is not on the classpath. Perhaps JAVA_HOME does not point to the JDK 产生的原因是java.home指到$JAVA_HOME/jre下了，而其lib下的tools.jar跟$JAVA_HOME/lib/tools.jar不一样，编译jsp的时候需要用到后者. 注: java.home在运行的时候就会指向$JRE_HOME. jdk1.6.0_03 都会出现这种情况. 修改方法：在tomcat控制台(双击tomcate5w.exe)java选项-〉java virtual machine 设置为%java_home%\jre\bin\server\jvm.dll tomcat控制台java选项-〉Java classpath: %tomcat_home%\bin\bootstrap.jar;%java_home%\lib\tools.jar 注：%java_home%、%tomcat_home分别指jdk、tomcat的安装根目录   tomcat_home, java_home都已经添加到了环境变量里，但启动jsp的时候却出现了以下的异常 Unable to find a javac compiler; com.sun.tools.javac.Main is not on the classpath. Perhaps JAVA_HOME does not point to the JDK 解决方案： 只要把JAVA_HOME/lib/tools.jar拷到TOMCAT_HOME\common\lib下，重启动Tomcat，OK

 

以上jdk1.6.0_03 +tomcat5.0.28出现上述现象，并按相应方法解决