Integrating DWR3 and Spring3

Exceptions while integrating DWR3 and Spring3.X annotation based MVC:

Following are the solutions for the Exception commonly occur while integration:

1. “org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Cannot locate BeanDefinitionParser for element [annotation-scan]“.

Solution:

• Don’t use  DWR with version number  DWR 3.0M1(available in Maven Repository)
• Use DWR 3.0-RC1-116 or later version. You can down load the latest version from

                     <repositories><repository>

                    <id>repository.sonatype.org -public</id>

                          <name>DWR repository</name>

                          <url>https://oss.sonatype.org/content/groups/public</url>

                        </repository></repositories>

                             <dependency>

                     <groupId>org.directwebremoting</groupId>

                     <artifactId>dwr</artifactId>

                     <version>3.0.0-rc3-SNAPSHOT</version>

              </dependency>

 2.If you are trying to keep DWR and Spring Configuration in the same xml file there may be a chance to occur duplicate name found Exception.

 

org.springframework.beans.factory.BeanCreationException:

Error creating bean with name ‘DwrAnnotationURLMapper’:

Initialization of bean failed;

nested exception is org.springframework.beans.factory.BeanCreationException:

Error creating bean with name ‘dwrController’:

Invocation of init method failed;

nested exception is java.lang.IllegalArgumentException:

java.lang.IllegalArgumentException:

Duplicate name found

 Solution: keep separate dwr.xml and don’t import into spring-config.xml file instead configure in web.xml as shown below

<servlet>

<servlet-name>SampleDWR</servlet-name>

<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

<init-param>

<param-name>contextConfigLocation</param-name>

<param-value>classpath: dwr.xml</param-value>

</init-param>

<load-on-startup>1</load-on-startup>

</servlet>

 

3. No adapter for handler [org.directwebremoting.spring.DwrController@1b3f577]: Does your handler implement a supported interface like Controller?

Solution: keep the following line of code in dwr.xml file

<bean class=”org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter” />

This is because mvc: annotation-driven element doesn’t declare a SimpleControllerHandlerAdapter

4 .If you are using Tomcat7 and DWR.3.0-RC1-116.jar file then you will get  “CSRF Security Error”: java.lang.SecurityException: CSRF Security Error

Solution:

• One fix is to make the default Tomcat 7 tomcat/conf/context.xml (or your application’s context XML) put the useHTTPOnly on the Context element, like so: <Context useHttpOnly=”false”>
• You can also fix this issue by using the latest DWR build

https://oss.sonatype.org/content/groups/public/org/directwebremoting/dwr/3.0.0-rc3-SNAPSHOT/

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