Struts 2 + Spring + Interceptors + Bean Null

[Jacques Mivi]

Hi,

Small problem that I struggled for several days. I use frameworks Spring 3 + Hibernate + Struts 2.

I have a login action. I inject a bean via Spring and it works fine. Now I try to create an interceptor to separate the input validation and the action. But the intercetpor c'ant access to a bean.


An abstract of the interceptor

public class AuthenticationInterceptor extends ActionSupport implements Interceptor {
 
    private AccountBean accountBean;
 
    @Override
    public String intercept(ActionInvocation invocation) throws Exception {
 
            Log.debug("----- Email : " + accountBean.getEmail());
            Log.debug("----- Password : " + accountBean.getPassword());        
String returnResult = Action.LOGIN;
 
        try {
 
            if (accountBean.getEmail().isEmpty() || accountBean.getPassword().isEmpty()) {
                throw new ServiceNoResultException();
 
            } else {
                returnResult = invocation.invoke();
            }
 
        } catch (NullPointerException ex) {
            ex.printStackTrace();
            addActionError(getText("verification.connexion.errorLogIn"));
 
        } catch (ServiceNoResultException ex) {
            ex.printStackTrace();
            addActionError(getText("verification.connexion.errorLogIn"));
 
        } catch (Exception ex) {
            ex.printStackTrace();
            addActionError(getText("verification.connexion.error"));
 
        } finally {
            return returnResult;
        }
 
    public AccountBean getAccountBean() {
        return accountBean;
    }
 
    public void setAccountBean(AccountBean accountBean) {
        this.accountBean = accountBean;
    }
 
    }

I updated applicationContext.xml as follows:

  <bean id="accountBean" class ="beans.AccountBean" />
 
    <bean id="authentificationInterceptor" class="interceptors.AuthenticationInterceptor" >        
        <property name="accountBean" ref="accountBean" />
    </bean>

And finally I inject in struts.xml

   <interceptors>
            <interceptor name="authenticationIntercept" class="authentificationInterceptor" />
 
            <interceptor-stack name="newStack">
                <interceptor-ref name="basicStack"/>
                <interceptor-ref name="authenticationIntercept"/>
            </interceptor-stack>
 
        </interceptors>
 
 
        <action name="authentificationAccount" class="accountAction" method="authentification" >
            <interceptor-ref name="newStack"/>
            <result name="login"> //jsp/loginCheckFailed.jsp </result>
            <result name="success" type="redirectAction"> displayInformationMember.action </result>
        </action>

And unfortunately I have always the following error

INFO: DEBUG:----- AuthenticationInterceptor Email  : null
INFO: DEBUG:----- AuthenticationInterceptor Password : null
GRAVE: java.lang.NullPointerException
        at interceptors.AuthenticationInterceptor.intercept(AuthenticationInterceptor.java:32)

The strangest thing is when I do all the processing in the action (without interceptor) everything works good.

If you have an idea I'm interested.

Thank you & Have a nice day

[Mohana Rao Sv]

When you are calling that object from database? How you are doing that?

[Jacques Mivi]

When you are calling that object from database? How you are doing that?

Hello,

My jsp - Account bar

                <s:form action="authentificationAccount" method="post" cssClass="authentificationForm" theme="simple">
                        <s:textfield name="accountBean.email" key="logon.label.email" />
                         <s:password  name="accountBean.password" key="logon.label.password" />
                        <s:submit value="Connexion" align="left"  cssClass="submit" />
                </s:form>

My struts.xml

        <action name="authentificationAccount" class="accountAction" method="authentificationAction" >
            <result name="login"> //jsp/loginCheckFailed.jsp </result>
            <result name="success" type="redirectAction"> displayInformationMember.action </result>
        </action>

An abstract of the Action

    private AccountBean accountBean;

public String authentificationAction() {

        String returnResult = Action.ERROR;

        try {
            this.account = this.service.authentification(accountBean.getEmail(), accountBean.getPassword());

        } catch (Exception ex) {
            ex.printStackTrace();
            addActionError(getText("verification.connexion.error"));

        } finally {
            return returnResult;
        }
    }

    public AccountBean getAccountBean() {
        return accountBean;
    }

    public void setAccountBean(AccountBean accountBean) {
        this.accountBean = accountBean;
    }

And myapplicationContext.xml

    <bean id="accountBean" class ="beans.AccountBean" />
    <bean id="accountService" class="service.AccountServiceImpl" />
    <bean id="accountAction" scope="prototype" class="action.AccountAction">
        <constructor-arg ref="accountService" />
    </bean>

With this way everything works good accountBean can be use with the jsp data.

[Jacques Mivi]

When I try to change the interceptor in action. AccountBean can be use.

For exemple the interceptor

    public void intercept(){
        Log.debug("----- AuthenticationInterceptor Email  : " + accountBean.getEmail());
        Log.debug("----- AuthenticationInterceptor Password : " + accountBean.getPassword());
    }

and struts.xml

        <action name="authentificationAccount" class="authentificationInterceptor" method="intercept" >
            <interceptor-ref name="newStack"/>
            <result name="login"> //jsp/loginCheckFailed.jsp </result>
            <result name="success" type="redirectAction"> displayInformationMember.action </result>
        </action>

Display what i record in the jsp.

The interceptors method intercept(ActionInvocation invocation) seems to disturb spring.

[Jacques Mivi]

I'm progressing slowly.

It's seems that the bean "accountBean" it's different beetween the class action and class interceptor. The bean created with my accountbar.jsp is used to create the class action but not my interceptor.

I try to change the scope without success.

[Jacques Mivi]

Still no solution, Any idea?