Apache Cayenne Upgrade Information
==================================

UPGRADING FROM 3.0M3

* Per CAY-1049 API of the internal classes that participate in SelectQuery translation has changed in a way that
  is not backwards compatible. This should not affect regular users, however if you implemented a custom DbAdapter,
  check for classes that directly or indirectly inherit from QueryAssembler and QueryAssemblerHelper and fix them
  if needed.

UPGRADING FROM 3.0M2

* Java 5 is now required as a minimum for Cayenne Modeler and the Cayenne libraries.

* After the move to Java 5, generics have been implemented in many of the Cayenne APIs. If you don't use generics in your project this should not affect you, but if you do you will need to review any new compiler errors or warnings. The effect of generics is at compile time only, so their introduction will not change the runtime behaviour of your application once compiled.


UPGRADING FROM 3.0M1

* Lifecycle Callbacks require no setup:
  Per CAY-843, lifecycle callback functionality is now built into DataContext and DataDomain, 
  so all the custom code to set them up is no longer needed. Also as a result of this change
  'org.apache.cayenne.intercept' package is removed from Cayenne.
  Further information can be found here: http://cayenne.apache.org/doc/lifecycle-callbacks.html

UPGRADING FROM 2.0 AND OTHER APACHE RELEASES

* Jar files:
  - all jar files now include version numbers in their names.
  - "cayenne-nodeps.jar" is renamed to "cayenne-server-x.x.x.jar" 
  - "fat" cayenne.jar file that included dependencies is no longer distributed. 
    All dependencies that it contained are included as separate jars under 
    "cayenne-x.x.x/lib/third-party/". The new "cayenne-server-x.x.x.jar" plus 
    dependencies should be used in place of cayenne.jar.
  - A new "cayenne-agent-x.x.x.jar" is included. It is used for class enhancement 
    with POJO's and JPA. "Classic" Cayenne users can ignore this file.
    
* Ant class generator is using what was called "version 1.2" by default. This means that if you were
  using custom Velocity templates in 1.1 mode, you should either change the templates or specify 'version="1.1"'
  in the buildfile explicitly.

* Cross-platform Modeler Startup is now done without a batch file or a shell script. 
  A "fat" CayenneModeler.jar is included in the "cayenne-x.x.x/bin" directory
  and can be run either by double-clicking the jar (on platforms that support that)
  or by running "java -jar CayenneModeler.jar".
  
* Note that FireBird adapter is no longer distributed with Cayenne. The one we had was half-working
  and we could not support it anymore.
  
* DataContextTransactionEventListener, DataObjectTransactionEventListener, DataContextEvent all were deprecated
  favor of callbacks. NOTE THAT THIS API WILL BE REMOVED IN THE FOLLOWING 3.0 MILESTONES.
  
* Long PK: Cayenne now supports "long" primary key generation (previously it only supported "int"). You may
  have to change the existing PK lookup tables on some databases to take advantage of that (this is optional,
  and is needed if you expect your PK to exceed maximum value of an "int" allowed in your database). E.g. on 
  MySQL you may run the following SQL:
  
  ALTER TABLE AUTO_PK_SUPPORT CHANGE COLUMN NEXT_ID NEXT_ID BIGINT NOT NULL;
  

UPGRADING FROM 1.2 AND OTHER OBJECTSTYLE RELEASES

Since 2.0, Cayenne is an Apache project, so all "org.objectstyle.*" java packages 
where renamed to "org.apache.*" analogues. Since 1.2.x and 2.0.x release lines maintain
full compatibility with each other, differing only in package names, upgrading to 2.0.x
can be a first step in a safe upgrade to the latest version of Cayenne.

* Upgrading mapping files:

To upgrade the mapping files, open them in the new Modeler. You should see an upgrade 
dialog. Once you confirm the upgrade 

* Upgrading the code:

Replace "org.objectstyle." with "org.apache." everywhere in imports and do a clean 
recompile.

* Upgrading logging configuration

If you are using custom logging configuration file, make sure that all the 
Cayenne loggers are changed from "org.objectstyle" to "org.apache".
