I am trying to understand why my web application throws a
LazyInitializationException when trying to lazily initialize a
collection in an entity object.
>From what I have read, I needed to setup a filter for Hibernate in my
web.xml and since I am using JPA the filter was defined as follows:
<filter>
<filter-name>hibernateFilter</filter-name>
<filter-class>org.springframework.orm.jpa.support.OpenEntityManagerInVie
wFilter</filter-class>
<init-param>
<param-name>entityManagerFactoryBean</param-name>
<param-value>entityManagerFactory</param-value>
</init-param>
</filter>
And then the mapping was set as follows:
<filter-mapping>
<filter-name>hibernateFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
// LoginAction.java
public String execute() {
User user = userService.authenticate(userName,password);
if(user != null) {
setSessionObject(Constants.USER_KEY, user);
return Action.SUCCESS;
}
return Action.ERROR;
}
When a user is at the login form and the LoginAction execute() method is
called, the user object is instantiated properly from the user service
and contains all the eagerly pulled values. I then click on another URL
which calls another action's execute method that does the following:
public String execute() {
User user = getSessionObject(Constants.USER_KEY);
if(user != null) {
if(user.getUserRoles().size() > 0) {
// do some other stuff
}
}
return Action.ERROR;
}
The problem is when getUserRoles() is called, I get the error because
they are not pulled eagerly when the User entity is first fetched from
the database. Is there a way I can avoid this
LazyInitializationException problem?
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