Monday, November 26, 2007

Upgrading from Spring 2.0 to 2.5

I'm about mid-stream on a project built using Maven2 and using the Spring Framework to glue it together.
The cool kids at Spring Source, recently announce the release of Spring 2.5. It seems best to try to upgrade now while the project is still in development than later (and deal with extra QA requirements).

At first my thinking is this should be easy, go to the maven repository and see what the latest versions are, edit my pom, and rebuilt the project and see what happens.

For the most part, it is that easy.

But, then there are the 'other' little things.

An issue, unrelated to Spring is Open Smphony's OSCache. Updating from 2.3 to 2.4 introduces a dependency on JMS that can't be resolved. Why should an object caching system depend on JMS? If it must, why can't they define the damn POM correctly so the dependency can be found? Its the standard JMS api jar for crying out loud.

Anyway, back to Spring 2.5. Changes made:

<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring</artifactId>
  <version>2.0.6</version>
  <scope>compile</scope>
</dependency>
<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-core</artifactId>
  <version>2.0.6</version>
  <scope>compile</scope>
</dependency>
<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-webmvc</artifactId>
  <version>2.0.6</version>
  <scope>compile</scope>
</dependency>

Becomes

<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring</artifactId>
  <version>2.5</version>
  <scope>compile</scope>
</dependency>
<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-core</artifactId>
  <version>2.5</version>
  <scope>compile</scope>
</dependency>
<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-webmvc</artifactId>
  <version>2.5</version>
  <scope>compile</scope>
</dependency>


Then:
mvn clean package
is run, the test server started, and all appears well and good in the world.

Kudo's to the good folks at Spring Source. Backwards compatibility is a beautiful thing.

Update:
I forgot to mention, the namespaces in the configuration files should get updated at some point as well. I didn't encounter any problems with the 2.0 namespaces and the 2.5 libraries. However, there are a few improvements, notably the JndiObjectFactoryBean, that are pretty darned useful.
<beans
xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:jee="http://www.springframework.org/schema/jee"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:cache="http://www.springmodules.org/schema/oscache"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-2.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd
http://www.springmodules.org/schema/oscache http://www.springmodules.org/schema/cache/springmodules-oscache.xsd" />

becomes

<beans
xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:jee="http://www.springframework.org/schema/jee"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:cache="http://www.springmodules.org/schema/oscache"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-2.5.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
http://www.springmodules.org/schema/oscache http://www.springmodules.org/schema/cache/springmodules-oscache.xsd" />

WooHoo!

Now, if the Spring Modules guys could get their act together....

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