I am running Seam version 1.1.6 on a JBoss 4.0.5.GA server.
While following the example from the Seam documentation (page 124) for creating
a SeamLoginModule authentication method I have run into the following error:
09:37:41,228 ERROR [SeamLoginModule] Error invoking login method
| javax.faces.el.EvaluationException: Exception while invoking expression
#{authenticator.authenticate}
| at
org.apache.myfaces.el.MethodBindingImpl.invoke(MethodBindingImpl.java:153)
| at
org.jboss.seam.actionparam.ActionParamBindingHelper.invokeTheExpression(ActionParamBindingHelper.java:59)
| at
org.jboss.seam.actionparam.ActionParamMethodBinding.invoke(ActionParamMethodBinding.java:74)
| [SNIP]
| at java.lang.Thread.run(Thread.java:595)
| Caused by: org.jboss.seam.RequiredException: In attribute requires value
for component: authenticator.entityManager
| at org.jboss.seam.Component.getInstanceToInject(Component.java:1920)
| at org.jboss.seam.Component.injectFields(Component.java:1386)
| at org.jboss.seam.Component.inject(Component.java:1156)
| [SNIP]
| ... 59 more
This suggests that Seam is unable to locate and inject the entityManager by its
component name. The relevant java bean that the login component is calling is
as follows:
@Name("authenticator")
| public class Authenticator
| {
| @In EntityManager entityManager;
|
| public boolean authenticate()
| {
| return true;
| }
| }
For completeness here, is the form that is calling the validation:
<!DOCTYPE composition PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
|
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd";>
| <ui:composition xmlns="http://www.w3.org/1999/xhtml";
| xmlns:s="http://jboss.com/products/seam/taglib";
| xmlns:ui="http://java.sun.com/jsf/facelets";
| xmlns:f="http://java.sun.com/jsf/core";
| xmlns:h="http://java.sun.com/jsf/html";
| template="layout/template.xhtml">
|
| <ui:define name="body">
|
| <h1>Login</h1>
| <p>Please login using any username and password</p>
|
| <h:messages styleClass="message"/>
|
| <h:form>
|
| <div class="dialog">
| <div class="prop">
| <span class="name">Username</span>
| <span class="value">
| <h:inputText id="username"
value="#{identity.username}"/>
| </span>
| </div>
| <div class="prop">
| <span class="name">Password</span>
| <span class="value">
| <h:inputSecret id="password"
value="#{identity.password}"/>
| </span>
| </div>
| <div class="prop">
| <span class="name">Remember me</span>
| <span class="value">
| <h:selectBooleanCheckbox id="rememberMe"
value="#{identity.rememberMe}"/>
| </span>
| </div>
| </div>
|
| <div class="actionButtons">
| <h:commandButton value="Login" action="#{identity.login}"/>
| </div>
|
| </h:form>
|
| </ui:define>
| </ui:composition>
I have also tried to annotate the EntityManager object in the following ways:
@In("entityManager") EntityManager entityManager;
|
| @In(value="entityManager") EntityManager entityManager;
but have recieved the same error.
My configuration was generated by seam-gen and the authenticate method works
fine until I try to inject an EntityManager into the component.
I will create a Stateful Session Bean in order to try to inject the
EntityManager by the EJB3.0 annotation @PersistenceContext rather than Seam @In
annotation.
Could this be caused by a filter loading order? I've looked at web.xml and it
does not seem to be the cause. I think too that the identity component is a
Seam component (ie. eats its own dogfood), therefore should not be a problem,
Maybe the identity component is instantiated before other components like the
entity manager?
P.S. Thank you Gavin King for all your past helpful answers.
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