Dear All,
I am using Stripes for last 5months. Now I came across a situation to make
the action call synchronized as I am getting some weird exception from
hibernate while populating object using HQL.
Errors are not static. Some times its gives Duplicate Mapping exception,
Sometimes it gives Mapping Exception. Sometimes methods gives proper result.
The Situation is, I have 4 iframes in one jsp and the url of these iframe is
to same action class with different action method by passing different
values. But DAO method is same in these action methods.
These methods works fine if I call these methods one by one. But when I use
iframes the request to these actions are happening at the same time them
methods throws exception.
I tried with synchronized block/synchronized method at DAO service level but
the error is same. I reckon this can be solved by making these request
synchronized in action.
Did anybody come across any situation like this? Can anyone tell me how to
make the this action in single thread model? Or Can anyone suggest something
on this situation?
Here is my implementation.
In my jsp.
---
<IFRAME SRC="Form.action?techPortal" WIDTH=100% frameborder="0"></IFRAME>
---
<IFRAME SRC="Form.action?warrantryPortal" WIDTH=100%
frameborder="0"></IFRAME>
---
<IFRAME SRC="Form.action?pubPortal" WIDTH=100% frameborder="0"></IFRAME>
---
<IFRAME SRC="Form.action?miscPortal" WIDTH=100% frameborder="0"></IFRAME>
----
FormAction.class
----
---
public Resolution techPortal() {
this.docs = FormDAOFactory.createFormsDAO().loadByCategory(1l);
return new ForwardResolution("documentTree.jsp");
}
public Resolution warrantryPortal() {
this.docs = FormDAOFactory.createFormsDAO().loadByCategory(2l);
return new ForwardResolution("documentTree.jsp");
}
public Resolution pubPortal() {
this.docs = FormDAOFactory.createFormsDAO().loadByCategory(3l);
return new ForwardResolution("documentTree.jsp");
}
public Resolution miscPortal() {
this.docs = FormDAOFactory.createFormsDAO().loadByCategory(4l);
return new ForwardResolution("documentTree.jsp");
}
---
---
DAO.
public List<Attachment> loadByCategoryTest(Long category) throws
DAOException {
List<Attachment> list;
Session session = null;
try {
session = HibernateUtil.getCurrentSession();
Query query = session.createQuery("select e from Attachment e
where e.category.id = :id order by e.type.id ");
list = query.setParameter("id", category).list();
} catch (Exception e) {
e.printStackTrace();
throw new DAOException(e.getMessage());
} finally {
session.flush();
session.close();
}
return list;
}
Attachment.xml
<hibernate-mapping>
<class name="au.com.toyota.aim.forms.domain.Attachment"
table="TBL_FORM_ATTACHMENT">
<id name="attachmentId" type="long" column="ATTACHMENT_ID">
<generator class="increment"/>
</id>
<property name="fileName">
<column name="FILE_NAME"/>
</property>
<property name="contentType">
<column name="CONTENT_TYPE"/>
</property>
<property name="title">
<column name="TITLE"/>
</property>
<property name="attachmentURL">
<column name="ATTACHMENT_URL"/>
</property>
<property name="content" update="false">
<column name="ATTACHMENT" sql-type="MEDIUMBLOB"/>
</property>
<many-to-one name="category" column="category_Id"
foreign-key="category_Id" lazy="false"/>
<many-to-one name="type" column="type_Id" foreign-key="type_Id"
lazy="false"/>
</class>
</hibernate-mapping>
--
Cheers,
Tissen Sebastian
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