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  1.  Home
  2. JAVA400-L
  3. September 2011

Re:Java-400 newbie needs help

Hi,

calling Java from RPG via JNI will startup a JVM in every Job using this and starting maybe hundreds of JVMs won't scale well and only IBM will be happy to sell lots of hardware. Every RuntimeException coming up from Java could not be handled in RPG and will freeze the JVM for all following JNI calls from RPG. The JVM will be started implicit by the RPG runtime when the first JNI call occurs and all following calls within this job have to use this JVM and the associated settings. Using JNI calls in both directions adds addtitional complexity, because RPGs Multi threading capabilities are very limited.

As a conclusion of this all, I would strongly recommend not to use JNI calls from RPG.

D*B

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