Java开发网 - JSF中获取数据库数据的问题！

Topic: JSF中获取数据库数据的问题！

1.JSF中获取数据库数据的问题！

Posted by: flyingis
Posted on: 2005-07-13 18:28

我的开发环境是Eclipse3.0.1+Exadel Studio2.5.2+Tomcat5.0.18，在获取SQLServer2000中的数据时总是提示Managedbean customer could not be created Can't instantiate class: ''.不知道是什么原因？全部信息如下：
2005-7-11 22:51:56 com.sun.faces.application.ApplicationAssociate createAndMaybeStoreManagedBeans
严重: Managedbean customer could not be created Can't instantiate class: ''.
javax.faces.FacesException: Can't instantiate class: ''.
  at com.sun.faces.config.ManagedBeanFactory.getConvertedValueConsideringPrimitives(ManagedBeanFactory.java:869)
  at com.sun.faces.config.ManagedBeanFactory.setPropertiesIntoBean(ManagedBeanFactory.java:555)
  at com.sun.faces.config.ManagedBeanFactory.newInstance(ManagedBeanFactory.java:233)
  at com.sun.faces.application.ApplicationAssociate.createAndMaybeStoreManagedBeans(ApplicationAssociate.java:256)
  at com.sun.faces.el.VariableResolverImpl.resolveVariable(VariableResolverImpl.java:78)
  at com.sun.faces.el.impl.NamedValue.evaluate(NamedValue.java:125)
  at com.sun.faces.el.impl.ComplexValue.evaluate(ComplexValue.java:146)
  at com.sun.faces.el.impl.ExpressionEvaluatorImpl.evaluate(ExpressionEvaluatorImpl.java:243)
  at com.sun.faces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:173)
  at com.sun.faces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:154)
  at javax.faces.component.UIData.getValue(UIData.java:527)
  at javax.faces.component.UIData.getDataModel(UIData.java:856)
  at javax.faces.component.UIData.setRowIndex(UIData.java:379)
  at com.sun.faces.renderkit.html_basic.TableRenderer.encodeBegin(TableRenderer.java:65)
  at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:683)
  at javax.faces.component.UIData.encodeBegin(UIData.java:681)
  at javax.faces.webapp.UIComponentTag.encodeBegin(UIComponentTag.java:591)
  at javax.faces.webapp.UIComponentTag.doEndTag(UIComponentTag.java:543)
  at com.sun.faces.taglib.html_basic.DataTableTag.doEndTag(DataTableTag.java:491)
  at org.apache.jsp.index_jsp._jspx_meth_h_dataTable_0(index_jsp.java:231)
  at org.apache.jsp.index_jsp._jspx_meth_h_form_0(index_jsp.java:179)
  at org.apache.jsp.index_jsp._jspx_meth_f_view_0(index_jsp.java:119)
  at org.apache.jsp.index_jsp._jspService(index_jsp.java:72)
  at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133)
  at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
  at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:311)
  at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
  at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
  at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
  at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:284)
  at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:204)
  at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:742)
  at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:506)
  at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:443)
  at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:359)
  at com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:322)
  at com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:130)
  at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:87)
  at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)
  at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:117)
  at javax.faces.webapp.FacesServlet.service(FacesServlet.java:198)
  at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:284)
  at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:204)
  at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:257)
  at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
  at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:564)
  at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:245)
  at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:199)
  at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
  at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:564)
  at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:195)
  at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
  at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:164)
  at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:149)
  at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:564)
  at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:156)
  at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
  at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:564)
  at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:972)
  at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:206)
  at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:828)
  at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:700)
  at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:584)
  at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
  at java.lang.Thread.run(Thread.java:534)

2.Re:JSF中获取数据库数据的问题！ [Re: flyingis]	Copy to clipboard
Posted by: flyingis Posted on: 2005-07-17 10:15 这里怎么没有人？