Prasad Shindikar

@Dharmakumar

2.In the Spring config file add the mapping for this url
<bean name="/addEmployee.do" class="<give your controller class location with full package structure>"/>

If I do this, my tomcat crashes during startup with the following error
java.lang.IllegalStateException: Cannot map handler [/addEmployee.do] to URL path [/getAllEmployees]: There is already handler [action.EmployeeAction@17b4703] mapped.

@Prasad Krishnegowda
I had earlier tried doing that, but the request addEmployee.do was being resolved to /WEB-INF/jsp/addEmployee.jsp which is my default ViewResolver configuration in spring config file.

However, I tried the same again right now and it has worked. I have no idea why it had not worked the first time and why was it going to the ViewResolver earlier.

Anyway, thanks for your help!

Here's my web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> <display-name>spring3mvc</display-name> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <servlet> <servlet-name>springmvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>*.do</url-pattern> </servlet-mapping> </web-app>

This is my spring configuration file
<?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"> <!-- Place where the framework can search for Controller to specific URIs --> <context:component-scan base-package="action" /> <!-- The default view resolver that can be utilized in case we are not making use of Tiles --> <bean id="viewResolver" class="org.springframework.web.servlet.view.UrlBasedViewResolver" p:order="2"> <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" /> <property name="prefix" value="/WEB-INF/jsp/" /> <property name="suffix" value=".jsp" /> </bean> <bean id="beanNameResolver" class="org.springframework.web.servlet.view.BeanNameViewResolver" p:order="1"/> <!-- to define the message resources. Note that in above configuration we have defined basename property in messageSource bean to classpath:messages. By this, spring will identify that the message resource message_ will be used in this application.--> <bean id="messageSource" class="org.springframework.context.support.ReloadableResourceBundleMessageSource"> <property name="basename" value="classpath:MessageResources" /> <property name="defaultEncoding" value="UTF-8"/> </bean> </beans>

PS: The BeanNameViewResolver may or may not be necessary. I was just trying a couple of things and hence have added this entry.

Hi Hongli Li,

Please read my earlier post.

Yes, I have a dispatcher servlet with .do pattern. However, if I add .do as the extension, it searches for the following resource /WEB-INF/jsp/addEmployee.jsp due to the View Resolver configuration.

Instead, what I want is for the link to be mapped to a Controller which is annotated with @RequestMapping(value = "/addEmployee", method=RequestMethod.POST)

Can anyone help?

I have a feeling it has probably go to do something with the View resolvers. If I change the action="addEmployee" to action="addEmployee.do", the web server goes and searches for a page /WEB-INF/jsp/addEmployee.jsp!

What I want is for the link addEmployee to be resolved to /addEmployee which I have already annotated in my controller.

Hi,

I am a newbie to spring mvc. I have a employee form, which after filling 'submit's to an action, which is mapped to a Java Controller. However, the method is not being invoked. Can anyone help with the same?

Please find the attached code snapshots below.

Controller method signature
@RequestMapping(value = "/addEmployee", method=RequestMethod.POST) public ModelAndView insertOrUpdate(@ModelAttribute("employee") Employee employee) { logger.debug("insertOrUpdate"); System.out.println(employee.getFirstName());

jsp form
<form:form action="addEmployee" method="POST" commandName="employee"> <table> <tr> <td class="tdLabel"><form:label path="firstName"><spring:message code="label.firstName"/></form:label>:</td> <td><form:input path="firstName" size="40"/> <form:errors path="firstName"/></td> </tr> <tr> <td class="tdLabel"><form:label path="lastName"><spring:message code="label.lastName"/></form:label>:</td> <td><form:input path="lastName" size="40"/> <form:errors path="lastName"/></td> </tr> <tr> <td class="tdLabel"><form:label path="age"><spring:message code="label.age"/></form:label>:</td> <td><form:input path="age" size="20"/> <form:errors path="age"/></td> </tr> <tr> <td class="tdLabel"><form:label path="departmentId"><spring:message code="label.department"/></form:label>:</td> <td> <form:select path="departmentId"> <form:options items="${departments}" /> </form:select> </td> </tr> <tr> <td > <!-- html:hidden property="employeeId"/--> <br/> <input type="submit" value="<spring:message code="button.label.submit"/>" class="butStnd"/>     <input type="submit" value="<spring:message code="button.label.cancel"/>" class="butStnd"/> </td> </tr> </table> </form:form>

spring configuration xml - view resolver definitions
<bean id="viewResolver" class="org.springframework.web.servlet.view.UrlBasedViewResolver" p:order="2"> <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" /> <property name="prefix" value="/WEB-INF/jsp/" /> <property name="suffix" value=".jsp" /> </bean> <bean id="beanNameResolver" class="org.springframework.web.servlet.view.BeanNameViewResolver" p:order="1"/>

Can anyone tell me how do I invoke the Java Controller method from the .jsp page ?

I seemed to have forgotten the basic rule that when we use two integers for an arithmetic operation, the result is always an INT!

Thanks!

However, I am unable to understand

Operators are checked from left to right BUT with checking precedence!

What do you mean by checking precedence?

What is the value of the expression : 3+4-5*2/7 ?

I tried to solve it manually as follows. Since operator precedence is checked from LEFT to RIGHT of an expression, Multiplication(*) will happen first, followed by DIVIDE (/), followed by ADD(+) and finally SUBTRACT (-)

Here are the steps.
3+4-5*2/7
3+4-10/7
3+4-1.4
7-1.4
5.6

However, when I try to run the same in Java, I get the answer as 6.0

Can anyone explain, how operator precedence works?

cleared scbcd 5 with 88%

used the following books
ejb3 in action
mikalai zaikin's guide
ejb specs

solved sun's free assessment test - helpful in understanding a couple of things very specific to exams.

javaranch forums were also very helpful in understanding a few concepts.

The container serializes calls to each message-driven bean instance. Most containers will
support many instances of a message-driven bean executing concurrently; however, each
instance sees only a serialized sequence of method calls. Therefore, a message-driven bean
DOES NOT have to be coded as reentrant.

what does it mean when said

MDBs should not be coded as reentrant

Managed classes mean, the classes that are managed by the container. These can be Servlets, EJBs, JSF Backing beans etc. However, these cannot be Helper Classes that can be custom defined to provide for some specific functionality.

Since DI happens courtesy of the container, helper classes cannot access DI.

Hope this helps.

okay. so when a user is successfully authenticated, we (container) will get a security identity. till then if getCallerPrincipal is called, it will return UNAUTHENTICATED identity. Is this correct ?

Also, when and how does a container get the security context ? Did not understand this part correctly.

The question is from javabeat.net mock tests for scbcd 5.0

Supposing that I am aware of the MessageListener's class' fully qualified name, still according to the question, I don't think any snippet correctly defines a MDB. Especially since no xml descriptor is present, which can define the POJO to be an MDB.

I think, specifying the @MessageDriven annotation is also equally important, other than implement MessageListener to call a POJO as an MDB.

Imagine that you have a business interface by name 'Template'. Which of the following ways can be used by the Client Application to acquire a reference to the business interface (assuming that this interface is bound in the JNDI Context)?
1. @Resource SessionContext context; Template template = (Template)context.lookup("template"); 2. @EJB Template template; 3. Template template = null; InitialContext context = new InitialContext(); template = (Template)Context.lookup("java:comp/ejb/template"); 4. All the above.

Correct Answer: 4. I agree with 1 and 2.

In answer option 3, should'nt the context look up be something like

template = (Template)Context.lookup("java:comp/env/ejb/template");

Which of the following code snippets correctly declares a Message-Driven Bean by name 'TestMessageDrivenBean'?
1. public class TestMessageDrivenBean implements javax.jms.MessageListener { public void onMessage(Message message) { // Business logic here. } } 2. public class TestMessageDrivenBean implements javax.ejb.MessageListener { public void onMessage(Message message) { // Business logic here. } } 3. public class TestMessageDrivenBean implements javax.ejb.MessageListener { public void ejbRemove() { } public void setMessageDrivenContext(MessageDrivenContext context) { } } 4. All the above.

Correct Answer: 1 Can anyone explain why ?

I think, since none of the code snippets have a @MessageDriven annotation, and an xml descriptor file is not provided as part of the question, none of the answer choices are correct.