好象就是这句话:
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.
但我不知道怎么把JAVA_HOME 指向JDK;
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.
但我不知道怎么把JAVA_HOME 指向JDK;
JAVA_HOME=c:\j2sdk1.4.2
classpath=.;%JAVA_HOME%\lib\dt.jar;%JAVA_HOME%\lib\tools.jar;(.;一定不能少,因为它代表当前路径)
path=%JAVA_HOME%\bin
接着可以写一个简单的java程序来测试J2SDK是否已安装成功:
public class Test{
public static void main(String args[]){
System.out.println("This is a test program.");
}
}
将上面的这段程序保存为文件名为Test.java的文件。
然后打开命令提示符窗口,cd到你的Test.java所在目录,然后键入下面的命令
javac Test.java
java Test
此时如果看到打印出来This is a test program.的话说明安装成功了,如果没有打印出这句话,你需要仔细检查一下你的配置情况。
第四步:配置tomcat使之支持jsp
2.安装Tomcat后,在我的电脑->属性->高级->环境变量->系统变量中添加以下环境变量(假定你的tomcat安装在c:\tomcat):
CATALINA_HOME=c:\tomcat;
CATALINA_BASE=c:\tomcat; 然后修改环境变量中的classpath,把tomat安装目录下的common\lib下的servlet.jar追加到classpath中去,修改后的classpath如下:
classpath=.;%JAVA_HOME%\lib\dt.jar;%JAVA_HOME%\lib\tools.jar;%CATALINA_HOME%\common\lib\servlet.jar;
接着可以启动tomcat,在IE中访问http://localhost:8080,如果看到tomcat的欢迎页面的话说明安装成功了。
我的电脑点右键--〉属性--〉高级---〉环境变量
在系统变量内新建2项,
名字:classpath
值:c:\jdk1.4\lib\tools.jar;c:=jdk1.4\lib\dt.jar;
名字:java_home
值:c:\jdk1.4
set JAVA_HOME=c:\j2sdk\bin;
set path=%path%;c:\j2sdk\bin;.
com.sun.tools.javac.Main 是个什么东西啊?
你是运行servlet 还是jsp
可能代码有问题
提示
org.apache.jasper.JasperException: Unable to compile class for JSPAn error occurred at line: 12 in the jsp file: /test.jspGenerated servlet error:
[javac] Compiling 1 source fileD:\Tomcat 5.0\work\Catalina\localhost\_\org\apache\jsp\test_jsp.java:41: cannot resolve symbol
symbol : class counter
location: class org.apache.jsp.test_jsp
counter counter = null;
^An error occurred at line: 12 in the jsp file: /test.jspGenerated servlet error:
D:\Tomcat 5.0\work\Catalina\localhost\_\org\apache\jsp\test_jsp.java:43: cannot resolve symbol
symbol : class counter
location: class org.apache.jsp.test_jsp
counter = (counter) pageContext.getAttribute("counter", PageContext.REQUEST_SCOPE);
^An error occurred at line: 12 in the jsp file: /test.jspGenerated servlet error:
D:\Tomcat 5.0\work\Catalina\localhost\_\org\apache\jsp\test_jsp.java:45: cannot resolve symbol
symbol : class counter
location: class org.apache.jsp.test_jsp
counter = new counter();
^
3 errors
org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:127)
org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:351)
org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:415)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:458)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:439)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:552)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:291)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
我做的是一个计数器
楼上的也许你的jsp是有错误的。
但是我的是struts的例子怎么会有错呢?
com.sun.tools.javac.Main 在哪儿找到??