OpenShift has supported Apache Maven as default build system for Java based projects since the first release. All the Java projects created by OpenShift are maven based. A few months ago we also added support for Apache Ant. All OpenShift gears now have Apache Ant installed on them. So, using Apache Ant to build your project is as easy as updating the OpenShift build action hook. You can refer to my blog post to learn how you can use Ant to build your OpenShift projects.
Lately I have seen lot of developers asking how they can use Gradle to build their projects. Gradle combines the power and flexibility of Ant with the dependency management and conventions of Maven into a more effective way to build. A lot of open source projects and enterprises are using Gradle as their build system. The Spring Framework is one popular example of an open source project using Gradle. In this blog post, we will learn how we can configure an OpenShift Java project to use Gradle instead of Apache Maven to build the project.
Read full blog here https://www.openshift.com/blogs/run-gradle-builds-on-openshift
Shekhar Gulati 