我在classes目录下有waterjava文件夹里面有waterquery.class，且在编译时了通过，但调试运行时出错！

代码片段：
……
 



……
错误提示：
Apache Tomcat/4.0.3 - HTTP Status 500 - Internal Server Errortype Exception reportmessage Internal Server Errordescription The server encountered an internal error (Internal Server Error) that prevented it from fulfilling this request.exception org.apache.jasper.JasperException: Unable to compile class for JSP

An error occurred at line: 8 in the jsp file: /jsp/logintemp1.jsp

Generated servlet error:
D:hissTomcatworkhissjsplogintemp1$jsp.java:65: Class waterjava.waterquery not found.
                waterjava.waterquery dbquery = null;
                         ^


An error occurred at line: 8 in the jsp file: /jsp/logintemp1.jsp

Generated servlet error:
D:hissTomcatworkhissjsplogintemp1$jsp.java:68: Class waterjava.waterquery not found.
                    dbquery= (waterjava.waterquery)
                                       ^


An error occurred at line: 8 in the jsp file: /jsp/logintemp1.jsp

Generated servlet error:
D:hissTomcatworkhissjsplogintemp1$jsp.java:73: Class waterjava.waterquery not found.
                            dbquery = (waterjava.waterquery) java.beans.Beans.instantiate(this.getClass().getClassLoader(), "waterjava.waterquery");
                                                ^
Note: D:hissTomcatworkhissjsplogintemp1$jsp.java uses or overrides a deprecated API.  Recompile with "-deprecation" for details.
3 errors, 1 warning

 at org.apache.jasper.compiler.Compiler.compile(Compiler.java:285)
 at org.apache.jasper.servlet.JspServlet.loadJSP(JspServlet.java:552)
 at org.apache.jasper.servlet.JspServlet$JspServletWrapper.loadIfNecessary(JspServlet.java:177)
 at org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:189)
 at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:382)
 at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:474)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:243)
 at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
 at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
 at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:190)
 at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
 at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
 at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
 at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2343)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
 at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
 at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
 at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:170)
 at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
 at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
 at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
 at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
 at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
 at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
 at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:1012)
 at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1107)
 at java.lang.Thread.run(Thread.java:484)

把waterquery.class拷到classes目录下，改成

程序没有错。
waterquery.class路径：
classeswaterjavawaterquery.class
而waterquery.java中要带包路径：package waterjava ;

你是放在WEB-INF/classes/下面么？