Select the module for which you want to set an SDK and click Dependencies. If the necessary SDK is already defined in IntelliJ IDEA, select it from the Module SDK list. If you want a module to inherit a project SDK, select the Project SDK option from the Module SDK list. To develop applications in IntelliJ IDEA, you need a Java SDK (JDK). A JDK is a software package that contains libraries, tools for developing and testing Java applications (development tools), and tools for running applications on the Java platform (Java Runtime Environment - JRE). The JRE can be obtained separately from the JDK, but it's not suitable for application development, as it doesn't have essential components such as compilers and debuggers.

The bundled JRE is used for running the IDE itself, and it's not sufficient for developing Java applications. Before you start developing in Java, download and install a standalone JDK build.ĭue to the changes in the Oracle Java License, you might not have the rights to use Oracle's Java SE for free. We recommend that you use one of the OpenJDK builds to avoid potential compliance failures.

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