[UPDATE (Feb 26, 2012): I added Jelastic and created another category I'm calling Private Java PaaS in which I put GigaSpaces Cloudify, Cumulogic and ActiveState Stackato.]
[UPDATE (Apr 12, 2012): Added DotCloud and rearranged the list a bit]
A couple of weeks ago during OracleWorld/JavaOne, Oracle announced its public cloud offering, including its Oracle Java Cloud Service -- the latest entrant into the increasingly crowded Java Platform-as-a-Service space. Despite being the most popular programming language, PaaS offerings for Java were not adopted as quickly as those for Ruby, Python and PHP.
Not surprisingly, however, once Java PaaS arrived at the scene, many of the big players now have PaaS offerings -- given Java's popularity in the enterprise.
Here's the list I compiled (in alphabetical order). If I have overlooked anything, please let me know in the comments:
Public Java PaaS
- Amazon Elastic Beanstalk
- CloudBees Run@Cloud
- Google App Engine
- IBM SmartCloud Application Services
- Microsoft Azure
- Oracle Java Cloud Service
- OutSystems Agile Platform
- Red Hat OpenShift
- Salesforce.com Heroku for Java
- VMWare CloudFoundry
- WSO2 StratosLive
Private Java PaaS
It should be noted that HP has a also made some noise about a Java PaaS but it hasn't launched yet.
- Java PaaS Shootout: A technical comparison of Google App Engine, Amazon Elastic Beanstalk, and CloudBees RUN@Cloud