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This was presented at the IBM Innovate Conference in June 2013. We cover IBM's strategy and support for Java on the mainframe, including using WebSphere Batch runtime, using Java in the Unix System Services area, and the JZOS api. The JZOS api is part of the IBM Java Virtual Machine for z/OS, and with it you can manipulate assets in MVS through the ISPF gateway, including allocating and deleting datasets, writing to Sequential and Partitioned datasets, and integrate with modern Java frameworks. We cover how Rational Developer for Enterprise is positioned for Java development on the mainframe by combining Rational Application Developer and Rational Developer for System z features into a single interface. We cover several features of RAD such as code coverage, unit testing, and software analysis. We also cover some best practices using Java on the mainframe and incorporating it with other Java frameworks such as Spring, CDI, JPA, Mockito, and others.