Oracle has once again agreed to a cloud computing project with a former rival by signing a collaboration deal with Salesforce.com.

The companies said in a joint statement that that Salesforce would be migrating the core technology of its cloud computing platforms to Oracle products including Database and Java Middleware. Additionally, the company will adopt Oracle Exadata systems and integrate Fusion HCM and Financial Cloud into its services.

The deal could end what has become a frigid relationships between Oracle and Salesforce.com. Driven by growing competition in the cloud and CRM markets, the two firms have engaged in a very public war of words lead by chief executives Marc Benioff and Larry Ellison.

Most recently, the two companies squared off at the 2011 Oracle OpenWorld conference when Benioff was unceremoniously removed from his scheduled keynote address shortly before the conference kicked off.

“When customers choose cloud applications they expect rapid low-cost implementations; they also expect application integrations to work right out of the box – even when the applications are from different vendors,” Ellison said.

“That’s why Marc and I believe it’s important that our two companies work together to make it happen, and integrate the salesforce.com and Oracle Clouds.”

The announcement comes the day after Oracle announced a deal with longtime rival Microsoft to extend support on its products to the Windows Azure and Hyper-V cloud platforms. Analysts have said that such deals will be necessary should Oracle be able to maintain its stature in the cloud computing age.