Managed bean never gets instantiated - jsf

Question

In my JSF I have a dataTable. Each row (showing a user) has a form that takes his ID as only parameter. The problem is that the associated backing bean never gets called (neither the methods follow/unfollow nor the constructor and the PostConstruct annotated method).
searchUserResult.xhtml
<h:dataTable value="#{searchUserMB.searchResult}" var="user"
rowClasses="tdUser"
rendered="#{not empty searchUserMB.searchResult}">
<h:column>
<f:facet name="header">
<h:outputText value="#{bundle.Username}" />
</f:facet>
<h:outputText value="#{user.username}" />
</h:column>
<h:column>
<f:facet name="header">
<h:outputText value="#{bundle.Name}" />
</f:facet>
<h:outputText value="#{user.name}" />
</h:column>
<h:column>
<f:facet name="header">
<h:outputText value="#{bundle.Surname}" />
</f:facet>
<h:outputText value="#{user.surname}" />
</h:column>
<h:column>
<f:facet name="header">
<h:outputText value="#{bundle.Action}" />
</f:facet>
<h:form rendered="#{userMB.user.isFollower(user.id)}">
<h:commandButton value="#{bundle.Unfollow}"
action="#{followMB.unfollow}">
<f:param name="followerId" value="#{user.id}" />
</h:commandButton>
</h:form>
<h:form rendered="#{not userMB.user.isFollower(user.id)}">
<h:commandButton value="#{bundle.Follow}"
action="#{followMB.follow}">
<f:param name="followerId" value="#{user.id}" />
</h:commandButton>
</h:form>
</h:column>
</h:dataTable>
FollowMB
#ManagedBean
#RequestScoped
public class FollowMB {
#EJB
private DBObjectRemote db;
#ManagedProperty(value="#{userMB}")
private UserMB userMB;
#ManagedProperty(value="#{param.followerId}")
private int followerId;
public FollowMB() {
System.out.println("I'm in the constructor");
}
#PostConstruct
public void init() {
System.out.println("I'm in the PostConstruct");
}
public String follow() {
// DB stuff
}
public String unfollow() {
// DB stuff
}
public UserMB getUserMB() {
return userMB;
}
public void setUserMB(UserMB userMB) {
this.userMB = userMB;
}
public int getFollowerId() {
return followerId;
}
public void setFollowerId(int followerId) {
this.followerId = followerId;
}
}
Generated HTML:
<form id="j_idt15:0:j_idt30" name="j_idt15:0:j_idt30" method="post"
action="/myApp/private/searchUserResult.xhtml"
enctype="application/x-www-form-urlencoded">
<input type="hidden" name="j_idt15:0:j_idt30" value="j_idt15:0:j_idt30">
<script type="text/javascript"
src="/myApp/javax.faces.resource/jsf.js.xhtml?ln=javax.faces"></script>
<input type="submit" name="j_idt15:0:j_idt30:j_idt31" value="Follow"
onclick="mojarra.jsfcljs(document.getElementById('j_idt15:0:j_idt30'),
{'j_idt15:0:j_idt30:j_idt31':'j_idt15:0:j_idt30:j_idt31','followerId':'502'},'');
return false">
<input type="hidden" name="javax.faces.ViewState" id="j_id1:javax.faces.ViewState:0"
value="-6780758405072567889:8862631453580026176" autocomplete="off">
main.jsf
<h:form>
<h:inputText value="#{searchUserMB.searchTerm}" required="true"/><br/>
<h:commandButton action="#{searchUserMB.search}" />
</h:form>
SearchUserMB
#ManagedBean
#RequestScoped
public class SearchUserMB {
#EJB
private DBObjectRemote db;
private String searchTerm;
private List<User> searchResult;
public SearchUserMB() {}
public String search() {
searchResult = db.searchUser(searchTerm);
return "searchUserResult";
}
public String getSearchTerm() {
return searchTerm;
}
public void setSearchTerm(String searchTerm) {
this.searchTerm = searchTerm;
}
public List<User> getSearchResult() {
return searchResult;
}
public void setSearchResult(List<User> searchResult) {
this.searchResult = searchResult;
}
}