On 30.8.21 22:56, Thiago H. de Paula Figueiredo wrote:
If you want to tell Tapestry how to build and initialize your @SessionState
objects, you can implement ApplicationStateCreator and contribute an
ApplicationStateContribution instance with it for a given class to the
distributed configuration of the ApplicationStateManager services. Your
ApplicationStateCreator implementation will be called by
ApplicationStateManagerImpl to get the object instead of using
ObjectLocator.autobuild(). This is probably the best way of implementing
the logic you want here.
Hi Thiago (or anyone else that can help).
I tried to follow the suggestion with ApplicationStateContribution.
Either I am doing it the wrong way, or something is wrong with the
Hibernate session at the moment of ASO creation, as I have the same
problem again - session.createQuery returns null.
Here is the Application State Contribution code, it is a really simple
test code:
@Contribute(ApplicationStateManager.class)
public void contributeApplicationStateManager(
MappedConfiguration<Class, ApplicationStateContribution>
configuration, final Session session, final Logger logger) {
ApplicationStateCreator<UserInfo> userInfoCreator = new
ApplicationStateCreator<UserInfo>() {
public UserInfo create() {
Person p = (Person) session
.createQuery("from Person p where
p.userName='student1'")
.uniqueResult();
...
It fails right at this point.
This is the page, it is really a basic page:
public class Index {
@Property @SessionState private UserInfo userInfo;
}
And the .TML:
<html title="message:index-page"
xmlns:t="http://tapestry.apache.org/schema/tapestry_5_4.xsd";
xmlns:p="tapestry:parameter">
<p>${userInfo.userName}</p>
</html>
And this is UserInfo, not much here:
package info.ajanovski.muldequa.model;
public class UserInfo {
public static enum UserRole {
NONE, STUDENT, INSTRUCTOR, ADMINISTRATOR
};
private String userName;
private Long personId;
private List<UserRole> userRoles;
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public Long getPersonId() {
return personId;
}
public void setPersonId(Long personId) {
this.personId = personId;
}
public List<UserRole> getUserRoles() {
return userRoles;
}
public void setUserRoles(List<UserRole> userRoles) {
this.userRoles = userRoles;
}
public boolean isNone() {
return userRoles.contains(UserRole.NONE);
}
public boolean isStudent() {
return userRoles.contains(UserRole.STUDENT);
}
public boolean isInstructor() {
return userRoles.contains(UserRole.INSTRUCTOR);
}
public boolean isAdministrator() {
return userRoles.contains(UserRole.ADMINISTRATOR);
}
}
The error log:
2021-09-03 19:27:32,396 [http-nio-8081-exec-3 ] INFO
org.apache.tapestry5.modules.InternalModule.PageLoader Loaded page
'Index' (mk) in 152.200 ms
2021-09-03 19:27:32,464 [http-nio-8081-exec-3 ] INFO
che.tapestry5.modules.TapestryModule.ApplicationStateManager
userInfoCreator.create entered
2021-09-03 19:27:32,475 [http-nio-8081-exec-3 ] ERROR
tapestry.render.info.ajanovski.muldequa.pages.Index Render queue error
in Expansion[PropBinding[expansion Index(userInfo.userName)]]: Cannot
invoke "org.hibernate.query.Query.uniqueResult()" because the return
value of "org.hibernate.Session.createQuery(String)" is null
org.apache.tapestry5.commons.internal.util.TapestryException: Cannot
invoke "org.hibernate.query.Query.uniqueResult()" because the return
value of "org.hibernate.Session.createQuery(String)" is null
at
org.apache.tapestry5.internal.bindings.PropBinding.get(PropBinding.java:67)
~[tapestry-core-5.7.3.jar:?]
...
...
Caused by: java.lang.NullPointerException: Cannot invoke
"org.hibernate.query.Query.uniqueResult()" because the return value of
"org.hibernate.Session.createQuery(String)" is null
at
info.ajanovski.muldequa.services.AppModule$3.create(AppModule.java:150)
~[classes/:?]
...
Exactly the location noted above.
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