在jbuilder中启动tomcat时出现这种错误提示，请问怎么回事？

[csdnbasketball]

我在jbuilder中配置好自己装的tomcat和JDK
用jbuilder的向导完成一个JSP后，运行时提示：
C:\j2sdk1.4.0\bin\java -classpath "C:\Tomcat4.0\lib\jasper-runtime.jar;C:\Tomcat4.0\lib\naming-factory.jar;C:\Tomcat4.0\common\lib\servlet.jar;C:\Tomcat4.0\webapps\new\classes;C:\Tomcat4.0\common\lib\servlet.jar;C:\j2sdk1.4.0\demo\jfc\Java2D\Java2Demo.jar;C:\j2sdk1.4.0\demo\plugin\jfc\Java2D\Java2Demo.jar;C:\j2sdk1.4.0\jre\lib\charsets.jar;C:\j2sdk1.4.0\jre\lib\ext\dnsns.jar;C:\j2sdk1.4.0\jre\lib\ext\ldapsec.jar;C:\j2sdk1.4.0\jre\lib\ext\localedata.jar;C:\j2sdk1.4.0\jre\lib\ext\sunjce_provider.jar;C:\j2sdk1.4.0\jre\lib\jaws.jar;C:\j2sdk1.4.0\jre\lib\jce.jar;C:\j2sdk1.4.0\jre\lib\jsse.jar;C:\j2sdk1.4.0\jre\lib\rt.jar;C:\j2sdk1.4.0\jre\lib\sunrsasign.jar;C:\j2sdk1.4.0\lib\dt.jar;C:\j2sdk1.4.0\lib\htmlconverter.jar;C:\j2sdk1.4.0\lib\tools.jar" org.apache.jasper.JspC -d "C:/Tomcat4.0/webapps/new/classes/Temporary_Files/.jsp/webapp" -p "" -c jsp1_0002ejsp_jsp -uriroot "C:/Tomcat4.0/webapps/new" "C:/Tomcat4.0/webapps/new/jsp1.jsp"

"jsp1.jsp": java.lang.NoClassDefFoundError: org/apache/jasper/JspC

Exception in thread "main"

请问怎么回事，该如何配置？谢谢！