SSM時遇到的異常（3）——IllegalStateException: Neither BindingResul..plain target object for bean ..'command'
阿新 • • 發佈：2019-01-01
JDK1.7+Tomcat7.0
十二月 27, 2018 9:01:00 下午 org.apache.catalina.core.ApplicationDispatcher invoke 嚴重: Servlet.service() for servlet jsp threw exception java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'command' available as request attribute at org.springframework.web.servlet.support.BindStatus.<init>(BindStatus.java:144) at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getBindStatus(AbstractDataBoundFormElementTag.java:168) at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getPropertyPath(AbstractDataBoundFormElementTag.java:188) at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getName(AbstractDataBoundFormElementTag.java:154) at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.writeDefaultAttributes(AbstractDataBoundFormElementTag.java:117) at org.springframework.web.servlet.tags.form.AbstractHtmlElementTag.writeDefaultAttributes(AbstractHtmlElementTag.java:422) at org.springframework.web.servlet.tags.form.InputTag.writeTagContent(InputTag.java:142) at org.springframework.web.servlet.tags.form.AbstractFormTag.doStartTagInternal(AbstractFormTag.java:84) at org.springframework.web.servlet.tags.RequestContextAwareTag.doStartTag(RequestContextAwareTag.java:80) at org.apache.jsp.WEB_002dINF.jsp.login_jsp._jspx_meth_s_005finput_005f0(login_jsp.java:195) at org.apache.jsp.WEB_002dINF.jsp.login_jsp._jspx_meth_s_005fform_005f0(login_jsp.java:131) at org.apache.jsp.WEB_002dINF.jsp.login_jsp._jspService(login_jsp.java:89) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) at javax.servlet.http.HttpServlet.service(HttpServlet.java:727) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334) at javax.servlet.http.HttpServlet.service(HttpServlet.java:727) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:748) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:486) at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:411) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:338) at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:168) at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303) at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1228) at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1011) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:955) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857) at javax.servlet.http.HttpServlet.service(HttpServlet.java:620) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842) at javax.servlet.http.HttpServlet.service(HttpServlet.java:727) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:313) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source)
或者
十二月 27, 2018 9:15:48 下午 org.apache.catalina.core.StandardWrapperValve invoke 嚴重: Servlet.service() for servlet [SpringMVC] in context with path [/MVCQ] threw exception [An exception occurred processing JSP page /WEB-INF/jsp/login.jsp at line 18 15: <td>使用者：</td> 16: <td> 17: <!-- <input type="text" name="username" id="username"> --> 18: <s:input path="username" id="username"/> 19: 20: </td> 21: </tr> Stacktrace:] with root cause java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'username' available as request attribute at org.springframework.web.servlet.support.BindStatus.<init>(BindStatus.java:144) at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getBindStatus(AbstractDataBoundFormElementTag.java:168) at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getPropertyPath(AbstractDataBoundFormElementTag.java:188) at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getName(AbstractDataBoundFormElementTag.java:154) at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.writeDefaultAttributes(AbstractDataBoundFormElementTag.java:117) at org.springframework.web.servlet.tags.form.AbstractHtmlElementTag.writeDefaultAttributes(AbstractHtmlElementTag.java:422) at org.springframework.web.servlet.tags.form.InputTag.writeTagContent(InputTag.java:142) at org.springframework.web.servlet.tags.form.AbstractFormTag.doStartTagInternal(AbstractFormTag.java:84) at org.springframework.web.servlet.tags.RequestContextAwareTag.doStartTag(RequestContextAwareTag.java:80) at org.apache.jsp.WEB_002dINF.jsp.login_jsp._jspx_meth_s_005finput_005f0(login_jsp.java:154) at org.apache.jsp.WEB_002dINF.jsp.login_jsp._jspService(login_jsp.java:94) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) at javax.servlet.http.HttpServlet.service(HttpServlet.java:727) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334) at javax.servlet.http.HttpServlet.service(HttpServlet.java:727) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:748) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:486) at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:411) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:338) at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:168) at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303) at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1228) at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1011) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:955) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857) at javax.servlet.http.HttpServlet.service(HttpServlet.java:620) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842) at javax.servlet.http.HttpServlet.service(HttpServlet.java:727) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:313) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source)
配置檔案沒有問題的情況下，在網址欄“http://localhost:8080/MVCQ/user/login”回車訪問(預設使用GET)，就報錯！！！
所以異常中有"....name 'command' available....."部分(圖內容出現在'參考及分享'的(3)文章中)
我使用了Spring標籤庫，但我的login.jsp的所有控制元件名name值都不屬於Javabean物件，也無對應的Javabean(可以與emp表有關係,這要在後臺自己控制)，使得從Controller返回頁面時，因<s:form>無modelAttribute屬性 加上 <s:input>等標籤中的屬性path值在某Javabean物件中沒有對應"變數或屬性"或沒有對應Javabean
所以
1、改用"標準標籤庫的input元素"
但,
2、也可以這樣解決,將控制元件屬性path的值都對應到某Javabean中
無論兩個解決方式的哪個，結果都是：
但是
使用第二種方式時，我點選“登入”按鈕，以“Method=post”訪問URL，還是會出現該異常
改用第一種方式（Controller類也很簡單），就不會出現對應異常
參考及分享:
（1）、Can not find the tag library descriptor for "http://www.springframework.org/tags/form" 解決方法
（2）、使用Spring標籤庫
（3）、SpringMVC表單標籤和表單標籤簡介
（4）、SpringMVC裡標籤報錯Neither BindingResult nor plain target object for bean name '***' available as
（5）、spring3 頁面form標籤binding錯誤
（6）、Java SSM註解錯誤 HTTP Status 500 - Servlet.init() for servlet SpringMVC threw exception
（7）、關於springmvc的context:component-scan 標籤使用時HTTP Status 500 - Servlet.init() for servlet springmvc threw exception的問題