error while processing a form

**diyeys** · Dec 3rd, 2009, 03:35 AM

Hello everyone,

I am trying to process a login form. This is my Controller:

Code:

@Controller
@RequestMapping("/index.htm")
@SessionAttributes("user")
public class LoginController {

	protected final Log logger = LogFactory.getLog(getClass());
	 
	@InitBinder
	public void setAllowedFields(WebDataBinder binder) {
		binder.setDisallowedFields(new String[] {"id"});
	}
	 
	@RequestMapping(method = RequestMethod.GET)
	public String setupForm(@RequestParam("user") User user, Model model) {	
		model.addAttribute("user", user);		 
		return "login";
	}
	    
	@RequestMapping(method = RequestMethod.POST)
	public String processSubmit(@ModelAttribute("user") User user, BindingResult result, SessionStatus status) {
		new LoginValidator().validate(user, result);
		if (result.hasErrors()) {
			return "login";
		} else {
			status.setComplete();
			return "index";
		}
	}

}

And this is my jsp with the form:

HTML Code:

<form:form modelAttribute="user">
	<table>
		<tr>
			<td>User Name :</td>
			<td><form:input path="user.login" /></td>
			<td><form:errors path="user.login" cssClass="error" /></td>
		</tr>
		<tr>
			<td>Password :</td>
			<td><form:password path="user.password" /></td>
			<td><form:errors path="user.password" cssClass="error" /></td>
		</tr>
	</table>
</form:form>

When i invoke login.jsp i am getting the following exception:

Code:

03-dic-2009 10:33:22 org.apache.catalina.core.StandardWrapperValve invoke
GRAVE: Servlet.service() para servlet jsp lanzó excepción
java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'user' available as request attribute
	at org.springframework.web.servlet.support.BindStatus.<init>(BindStatus.java:141)
	at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getBindStatus(AbstractDataBoundFormElementTag.java:175)
	at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getPropertyPath(AbstractDataBoundFormElementTag.java:195)
	at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getName(AbstractDataBoundFormElementTag.java:161)
	at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.autogenerateId(AbstractDataBoundFormElementTag.java:148)
	at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.resolveId(AbstractDataBoundFormElementTag.java:139)
	at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.writeDefaultAttributes(AbstractDataBoundFormElementTag.java:123)
	at org.springframework.web.servlet.tags.form.AbstractHtmlElementTag.writeDefaultAttributes(AbstractHtmlElementTag.java:409)
	at org.springframework.web.servlet.tags.form.InputTag.writeTagContent(InputTag.java:140)
	at org.springframework.web.servlet.tags.form.AbstractFormTag.doStartTagInternal(AbstractFormTag.java:91)
	at org.springframework.web.servlet.tags.RequestContextAwareTag.doStartTag(RequestContextAwareTag.java:78)
	at org.apache.jsp.login_jsp._jspx_meth_form_005finput_005f0(login_jsp.java:207)
	at org.apache.jsp.login_jsp._jspService(login_jsp.java:104)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
	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:128)
	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:293)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
	at java.lang.Thread.run(Unknown Source)

I have been reading some posts about this exception, but no luck so far.

Anyone knows what i am doing wrong?

Thanks a lot in advance

**axtavt** · Dec 3rd, 2009, 05:48 AM

Probably you should invoke index.htm instead of login.jsp.

**diyeys** · Dec 3rd, 2009, 06:26 AM

thanks for the response.

If i invoke index.htm i get a 404 error, thats weird...

here is the part of my web.xml where i configure my dispatcher servlet:

HTML Code:

	<servlet>
		<servlet-name>myapp</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<load-on-startup>1</load-on-startup>
	</servlet>

	<servlet-mapping>
		<servlet-name> myapp</servlet-name>
		<url-pattern>*.htm</url-pattern>
	</servlet-mapping>

And myapp-servlet.xml:

HTML Code:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:p="http://www.springframework.org/schema/p" 
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans 
        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context-3.0.xsd">

    <context:component-scan base-package="com.myapp.web.servlet.mvc"/>

    <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"/>
    
    <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"></property>
        <property name="prefix" value="/"></property>
        <property name="suffix" value=".jsp"></property>        
    </bean>

</beans>

It seems my configuration is ok, any idea?

**mlarchet** · Dec 3rd, 2009, 06:32 AM

Where is your User object instanciated ?

Your GET method should look like :

Code:

@RequestMapping(method = RequestMethod.GET)
public String setupForm(Model model) {	
	model.addAttribute("user", new User());		 
	return "login";
}

**diyeys** · Dec 3rd, 2009, 06:41 AM

Thanks mlarchet, you were right.

I rewrote my setupForm method as you pointed out and i am getting now the following exception:

Code:

org.springframework.beans.NotReadablePropertyException: Invalid property 'user' of bean class [com.myapp.model.user.User]: Bean property 'user' is not readable or has an invalid getter method: Does the return type of the getter match the parameter type of the setter?
	at org.springframework.beans.BeanWrapperImpl.getPropertyValue(BeanWrapperImpl.java:654)
	at org.springframework.beans.BeanWrapperImpl.getNestedBeanWrapper(BeanWrapperImpl.java:508)
	at org.springframework.beans.BeanWrapperImpl.getBeanWrapperForPropertyPath(BeanWrapperImpl.java:485)
	at org.springframework.beans.BeanWrapperImpl.getPropertyValue(BeanWrapperImpl.java:644)
	at org.springframework.validation.AbstractPropertyBindingResult.getActualFieldValue(AbstractPropertyBindingResult.java:96)
	at org.springframework.validation.AbstractBindingResult.getFieldValue(AbstractBindingResult.java:224)
	at org.springframework.web.servlet.support.BindStatus.<init>(BindStatus.java:120)
	at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getBindStatus(AbstractDataBoundFormElementTag.java:175)
	at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getPropertyPath(AbstractDataBoundFormElementTag.java:195)
	at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getName(AbstractDataBoundFormElementTag.java:161)
	at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.autogenerateId(AbstractDataBoundFormElementTag.java:148)
	at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.resolveId(AbstractDataBoundFormElementTag.java:139)
	at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.writeDefaultAttributes(AbstractDataBoundFormElementTag.java:123)
	at org.springframework.web.servlet.tags.form.AbstractHtmlElementTag.writeDefaultAttributes(AbstractHtmlElementTag.java:409)
	at org.springframework.web.servlet.tags.form.InputTag.writeTagContent(InputTag.java:140)
	at org.springframework.web.servlet.tags.form.AbstractFormTag.doStartTagInternal(AbstractFormTag.java:91)
	at org.springframework.web.servlet.tags.RequestContextAwareTag.doStartTag(RequestContextAwareTag.java:78)

I will try and see whats happening now. Thanks everyone for the help

**diyeys** · Dec 3rd, 2009, 06:48 AM

Thanks a lot everyone!

I finally got it working, the last error was in my jsp form:

HTML Code:

<tr>
			<td>User Name :</td>
			<td><form:input path="user.login" /></td>
			<td><form:errors path="user.login" cssClass="error" /></td>
		</tr>

I had to change it to:

HTML Code:

<tr>
			<td>User Name :</td>
			<td><form:input path="[COLOR="Red"]login[/COLOR]" /></td>
			<td><form:errors path="[COLOR="red"]login[/COLOR]" cssClass="error" /></td>
		</tr>

**mlarchet** · Dec 3rd, 2009, 07:06 AM

I'm glad it helps you.

Just an advice, from what I can see, you are keeping your JSP under the root folder of your application.
You should put them in a WEB-INF subfolder, like WEB-INF/jsp.

Code:

<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"></property>
        <property name="prefix" value="/WEB-INF/jsp/"></property>
        <property name="suffix" value=".jsp"></property>        
</bean>

You have to keep in mind that JSP are never directly reached from the user browser. Requests always go through DispatcherServlet (.htm extension in your case), then to your controller, and finally to your JSP after a forward from the ViewResolver.

**diyeys** · Dec 3rd, 2009, 07:10 AM

Thanks a lot mlarchet,

I will follow your advice.

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