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Steve Richter wrote: > What happens when the RPG procedure that instantiated the object returns? > Does the java object destruct and does the finalize member function get > called? No. The underlying support is JNI; Java never frees objects created by native programs because it has no idea of what the native program is doing. The RPG runtime can't keep track of object references, so it's up to the RPG programmer to free the objects. See here for a way to handle this fairly painlessly: http://faq.midrange.com/data/cache/282.html (RPG has support for writing Java native methods in RPG too. For native methods that are called by Java, any objects created by the native method are freed by default when the native method returns, so doing Java->RPG is easier than doing RPG->Java in this respect unless you actually want to save the object from being freed in which case it becomes complex again.) > What happens when the Java code throws and exception? > Can the RPG procedure catch it? Sort of, but the RPG procedure doesn't get an Exception object. The RPG runtime "catches" the Exception and turns it into an RNX0301 message, with the replacement text containing the toString() value of the Exception. If you wanted your RPG procedure to get the Exception object, you'd have to write a Java wrapper, or you could roll your own JNI call using the RPG version of jni.h (QSYSINC/QRPGLESRC,JNI). Actually, there's not much difference in the RPG<->Java function between V5R1 and even V5R3. (I don't know if V5R1 supports all the JDK versions that V5R3 support, though). The V5R3 RPG support adds a bit better support for exceptions, since you can now see the exception trace if you want. But in general, it's really just the RPG manuals that have gotten better. A warning if you do start using RPG's Java support in V5R1: in V5R1, the system allows the JVM to be destroyed and restarted. This ability is removed in V5R2, so don't build a dependency on it. I'd recommend using the V5R3 version of the ILE RPG Programmer's Guide even if you are on V5R1.
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