[Hibernate-JIRA] Created: (HHH-2281) CLONE -Calling Session.connection() generates java.lang.IllegalArgumentException: interface org.hibernate.jdbc.ConnectionWrapper is not visible from class loader
by Sergey Polzunov (JIRA)
CLONE -Calling Session.connection() generates java.lang.IllegalArgumentException: interface org.hibernate.jdbc.ConnectionWrapper is not visible from class loader
-----------------------------------------------------------------------------------------------------------------------------------------------------------------
Key: HHH-2281
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2281
Project: Hibernate3
Type: Bug
Versions: 3.2.1
Environment: Hibernate checked out from trunk; revision 10717
Reporter: Sergey Polzunov
Calling Session.connection() always generates an exception. Here is the stacktrace I get from the attached test case:
Exception in thread "main" java.lang.IllegalArgumentException: interface org.hibernate.jdbc.ConnectionWrapper is not visible from class loader
at java.lang.reflect.Proxy.getProxyClass(Proxy.java:353)
at java.lang.reflect.Proxy.newProxyInstance(Proxy.java:581)
at org.hibernate.jdbc.BorrowedConnectionProxy.generateProxy(BorrowedConnectionProxy.java:56)
at org.hibernate.jdbc.ConnectionManager.borrowConnection(ConnectionManager.java:163)
at org.hibernate.jdbc.JDBCContext.borrowConnection(JDBCContext.java:111)
at org.hibernate.impl.SessionImpl.connection(SessionImpl.java:359)
at TestSession.main(TestSession.java:16)
Changing the Connection.class.getClassLoader() to BorrowedConnectionProxy.class.getClassLoader() on line 57 in the generateProxy() method solves the problem. I am not very familiar with class loaders so I don't know if this is likeley to cause other problems elsewhere. Removing the ConnectionWrapper.class from the PROXY_INTERFACES array in the org.hibernate.jdbc.BorrowedConnectionProxy also solves the problem, but I guess it was added for a reason.
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17 years, 5 months
[Hibernate-JIRA] Created: (HHH-2254) A query validation bug produces QueryException: "Expected positional parameter count: 1, actual parameters: [Parent@bec357b] [from Child this where this.id.parent = ?]"
by Hernan Liendo (JIRA)
A query validation bug produces QueryException: "Expected positional parameter count: 1, actual parameters: [Parent@bec357b] [from Child this where this.id.parent = ?]"
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Key: HHH-2254
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2254
Project: Hibernate3
Type: Bug
Components: query-hql
Versions: 3.2.0.ga
Environment: Hibernate 3.2 using Sybase. However this is not an environment caused problem. It's supposed to happen in every environment.
Reporter: Hernan Liendo
-- Short description ============================================================================ --
A query validation bug produces QueryException: "Expected positional parameter count: 1, actual parameters: [Parent@bec357b] [from Child this where this.id.parent = ?].
Both Parent and Child use composite keys.
-- Context ====================================================================================== --
Having composite keys for a Parent class and a Child class, I want to retrieve childs that belong to an specific Parent.
-- Parent Definition ============================================================================ --
public class Parent {
public ParentId ParentId;
...
}
public class ParentId {
private String idField1;
private int idField2;
...
}
// the parent mapping
<hibernate-mapping>
<class mutable="false" table="xx" name="Parent">
<composite-id class="ParentId" access="field" name="parentId">
<key-property column="idField1" access="field" name="idField1"/>
<key-property column="idField2" access="field" name="idField2"/>
</composite-id>
</class>
</hibernate-mapping>
-- Child Definition ============================================================================ --
public class Child {
public ChildId childId;
...
}
public class ChildId {
public Parent parent;
public String aditionalIdField;
...
}
// the mapping
<hibernate-mapping>
<class mutable="false" table="yyy" name="Child">
<composite-id class="ChildId" access="field" name="childId">
<key-many-to-one name="parent" class="Parent" access="field">
<column name="idField1" not-null="true" />
<column name="idField2" not-null="true" />
</key-many-to-one>
<key-property column="aditionalIdField" access="field" name="aditionalIdField"/>
</composite-id>
</class>
</hibernate-mapping>
-- HQL Statement ============================================================================ --
from Child this where this.childId.parent = ?
or
from Child this where this.id.parent = ? // using aliased id
-- The Exception ============================================================================ --
org.hibernate.QueryException: Expected positional parameter count: 1, actual parameters: [Parent@bec357b] [from Child this where this.childId.parent = ?]
at org.hibernate.impl.AbstractQueryImpl.verifyParameters(AbstractQueryImpl.java:319)
at org.hibernate.impl.AbstractQueryImpl.verifyParameters(AbstractQueryImpl.java:275)
at org.hibernate.impl.QueryImpl.list(QueryImpl.java:75)
...
-- The Problem ============================================================================ --
class: org.hibernate.impl.AbstractQueryImpl
method: protected void verifyParameters(boolean reserveFirstParameter) throws HibernateException
line: 286
The method validates parameters. It resolves the "positionalValueSpan" variable witch in my case gets the value of 2 (One for parent's idField1 and the other for parent's idField2).
The method compares positionalValueSpan (2) with parameterMetadata.getOrdinalParameterCount() witch it is 1 (the quantity of "?" signs in the HQL statement".
This bug only happens when:
1. composed keys are used (and)
2. having a parent-child relationship (and)
3. resolving children from certain parent.
-- Hibernate user workaround ============================================================================ --
Not to use a parent instance variable in the Child class.
Hope this helps. If you guys need the source code in order to check the bug, please let me know it. Good luck!
Hernan
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17 years, 6 months
[Hibernate-JIRA] Created: (HHH-2586) Hibernate Serializable classes do not declare serialVersionUID
by Manuel Dominguez Sarmiento (JIRA)
Hibernate Serializable classes do not declare serialVersionUID
--------------------------------------------------------------
Key: HHH-2586
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2586
Project: Hibernate3
Issue Type: Bug
Components: core
Affects Versions: 3.2.3, 3.2.2, 3.2.1, 3.2.0.ga, 3.2.0.cr5, 3.2.0.cr4, 3.2.0.cr3, 3.2.0.cr2, 3.2.0 cr1, 3.1.3, 3.2.0.alpha2, 3.2.0.alpha1, 3.1.2, 3.1.1, 3.1, 3.1 rc3, 3.1 rc2, 3.1 rc 1, 3.1 beta 2, 3.1 beta 1, 3.0.5, 3.0.4, 3.0.3, 3.0.2, 3.0.1, 3.0 final, 3.0 rc 1, 3.0 beta 4, 3.0 beta 3, 3.0 beta 2, 3.0 beta 1, 3.0 alpha
Environment: Not specific to any database, platform or Hibernate version.
Reporter: Manuel Dominguez Sarmiento
None of the Serializable classes in Hibernate declare serialVersionUID (see http://www.hibernate.org/hib_docs/v3/api/serialized-form.html#org.hiberna...).
This is recommended practice for ALL classes that implement the Serializable interface (see Joshua Bloch's Effective Java - Item #54). Adding these fields is trivial and takes little effort, but is a great enhancement if you are serializing Hibernate classes.
For instance, we upgraded from Hibernate 3.2.2 to 3.2.3 in our production servers. We serialize process state (which sometimes includes references to Hibernate-managed entities) every 30 seconds or so and on shutdown, so in the event of failures or re-deployment, the processes can continue where they left off. We had a huge surprise when deserialization failed completely because AbstractPersistentCollection had slightly changed between the 3.2.2 and 3.2.3 releases, and this caused the automatically-generated default serialVersionUID to change, even though the changes in the serialized form are compatible as far as we can tell.
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17 years, 7 months
[Hibernate-JIRA] Created: (HHH-2477) lazy fetching ManyToOne produces inproper proxies when using single table inheritance strategy
by Daniel Nguyen (JIRA)
lazy fetching ManyToOne produces inproper proxies when using single table inheritance strategy
----------------------------------------------------------------------------------------------
Key: HHH-2477
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2477
Project: Hibernate3
Type: Bug
Components: core
Versions: 3.2.1
Environment: hibernate 3.2.1-GA, postgresql 8.1
Reporter: Daniel Nguyen
Attachments: bug.zip
I have entity base class Vehicle and entity class Car which extends Vehicle (using single table inheritance strategy).
I also have entity class User which have single-ended @ManyToOne relation from User to Vehicle with lazy fetching.
Now there is a Car instance "c" and User instance "u" with relation to "c". Lazily fetching vehicle from "u" results with proxy object "o" which is instanceof Vehicle but not instanceof Car as expected. So it's impossible cast "o" to Car or at least read any of Car's property from "o".
This is serious problem when inheritance is extensively used because inproper proxy object remains in cache. To walkaround I'd have to resign with lazy fetching (much performance loss) or manually replace proxy object in cache.
testing code:
SessionFactory sf = null;
Session s = null;
Transaction tx = null;
try
{
sf = cfg.buildSessionFactory();
s = sf.openSession();
tx = s.beginTransaction();
//create car
Car car = new Car();
car.setIdVehicle(1);
car.setAge(5);
s.save(car);
//create user of car
User user = new User();
user.setIdUser(1);
user.setVehicle(car);
s.save(user);
//make sure it is actually added
s.flush();
// test 1 - works ok, because we loaded vehicle before user
s.clear(); //clear cache
Vehicle vv = (Vehicle)s.get(Vehicle.class, 1);
User uu = (User)s.get(User.class, 1);
//we know that user vehicle is actually a Car
Car cc = (Car)uu.getVehicle();
// test 2 - fails, when using lazy fetching
s.clear(); //clear cache
User u = (User)s.get(User.class, 1);
Vehicle v = u.getVehicle();
//we know that user vehicle is actually a Car
//so we cast to Car but ClassCastException is raised!!!
Car c = (Car)v;
//let's check what's actual class of v
System.out.println(v.getClass().getName());
System.out.println(v.getClass().getSuperclass().getName());
//result:
// test.hibernate.Vehicle$$EnhancerByCGLIB$$12ce1883
// test.hibernate.Vehicle
//but I expected:
// test.hibernate.Car$$EnhancerByCGLIB$$xxxxx
// test.hibernate.Car
}
finally
{
if (tx!=null)
tx.rollback();
if (s!=null)
s.close();
if (sf!=null)
sf.close();
}
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17 years, 7 months