Create web services in your java application that expose the data the Mainframe wants from the Oracle database. It will then be up to the Mainframe development group to choose the language and framework that best fits their environment to call the web services. Since Mainframe systems are heavily customized you need to discuss requirements with the Mainframe group before you start coding. You can’t just assume that the Mainframe will be able to call your web services with a specific version of Java and a set of Java libraries.
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solved Data sharing between java web application and Mainframes