jsp 求救

[我就是个打字的]

2011-10-8 17:08:02 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet jsp threw exception
org.apache.jasper.JasperException: Unable to compile class for JSP:

An error occurred at line: 46 in the jsp file: /main_edittopic.jsp
The method queryAllTopic() is undefined for the type TopicDAO
43: </tr>
44: <%
45: TopicDAO query = new TopicDAOImpl();
46: List<Topic> topics = query.queryAllTopic();
47: for (int i=0;i<topics.size();i++) {
48: Topic topic = topics.get(i);
49: %>


Stacktrace:
at org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:92)
at org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:330)
at org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:439)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:349)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:327)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:314)
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:592)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:326)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:619)

[gukuitian]

The method queryAllTopic() is undefined for the type TopicDAO

这不是告诉你了吗

TopicDAO 这个类里没有queryAllTopic这个方法。

假如你的实现类TopicDAOImpl里有，也要在TopicDAO 加个对应的abstract方法

[wei_wxx]

你的方法实现了么- ~

[jiangxiayang]

[Quote=引用 1 楼 gukuitian 的回复:]
The method queryAllTopic() is undefined for the type TopicDAO

这不是告诉你了吗

TopicDAO 这个类里没有queryAllTopic这个方法。

假如你的实现类TopicDAOImpl里有，也要在TopicDAO 加个对应的abstract方法
[/Quote]
方法未定义呀

[我就是个打字的]

[Quote=引用 1 楼 gukuitian 的回复:]
The method queryAllTopic() is undefined for the type TopicDAO

这不是告诉你了吗

TopicDAO 这个类里没有queryAllTopic这个方法。

假如你的实现类TopicDAOImpl里有，也要在TopicDAO 加个对应的abstract方法
[/Quote]
这个都有了.还是出现这个问题.

[我就是个打字的]

[Quote=引用 2 楼 wei_wxx 的回复:]
你的方法实现了么- ~
[/Quote]实现过了

[lhjtianji]

List<Topic> topics = （List）query.queryAllTopic();楼主试下的

[luyun2011]

TopicDAO中找不到queryAllTopic() 方法，添加上就可以了

[wuwenjian123456]

学习
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