Abstract
Interfacing Ada and Java is a very tricky problem. As opposed to C, C++, or Fortran, the two languages execute on two different environments, Java on the JVM and Ada directly on the underlying OS. For this reason, it is not possible to directly bind Java functions to natively compiled Ada through a pragma Import. Two solutions are offered to the developer: either compiling the code directly to Java bytecode, using GNAT for the JVM, or using the Java Native Interface (JNI), allowing communication between the native and JVM environments. In this Gem we will take a look at the latter. Using this JNI layer manually is very error-prone and tedious. Fortunately, AdaCore provides a set of tools for automating the interface generation, through GNAT-AJIS. This Gem is the first of a series showing how this toolset can be used to create a mixed Ada /Java application.
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