为什么javabean用不了。急急急

[dbx]

服务器Apache tomcat4.18+win2kPro

运行色servlet没有问题。但在jsp页中调用javabean就出错,出错代码如下：

org.apache.jasper.JasperException: Unable to compile class for JSP

An error occurred at line: 3 in the jsp file: /index.jsp

Generated servlet error:
[javac] Compiling 1 source file

C:\Program Files\Apache Group\Tomcat 4.1\work\Standalone\localhost\examples\index_jsp.java:46: cannot resolve symbol
symbol : class sql_data
location: class org.apache.jsp.index_jsp
sql_data sqlbean = null;
^



An error occurred at line: 3 in the jsp file: /index.jsp

Generated servlet error:
C:\Program Files\Apache Group\Tomcat 4.1\work\Standalone\localhost\examples\index_jsp.java:48: cannot resolve symbol
symbol : class sql_data
location: class org.apache.jsp.index_jsp
sqlbean = (sql_data) pageContext.getAttribute("sqlbean", PageContext.SESSION_SCOPE);
^



An error occurred at line: 3 in the jsp file: /index.jsp

Generated servlet error:
C:\Program Files\Apache Group\Tomcat 4.1\work\Standalone\localhost\examples\index_jsp.java:51: cannot resolve symbol
symbol : class sql_data
location: class org.apache.jsp.index_jsp
sqlbean = (sql_data) java.beans.Beans.instantiate(this.getClass().getClassLoader(), "sql_data");
^
3 errors