Ok, I use lot of Java method calls from RPG free, so it is nice to have java doing complex bits which we can use in RPG<
I agree with one point in here that JVM garbage collection, that is the reason I developed JNI functions and I start and end object collections as (Monitor / End Monitor) blocks.
You can call directly the methods within a Java class, I don't understand why you would declare Java classes in as D spec ?
Murali
-----Original Message-----
From: java400-l-bounces@xxxxxxxxxxxx [mailto:java400-l-bounces@xxxxxxxxxxxx] On Behalf Of James Perkins
Sent: 24 August 2009 17:46
To: Java Programming on and around the iSeries / AS400
Subject: Re: Help calling java from RPG
Well, from this it's tough to tell you what your error is. I'm don't call Java from RPG very often, but nothing from this code is jumping out at me.
I am curious to know why you would use JPA form RPG? The reason for JPA in Java is because there is not native DB interface which RPG has.
I'm not even sure how you would get JPA to properly work in RPG. Using RPG to create Java objects isn't really a good idea. The JVM doesn't do GC automatically with these objects. From the manual:
"Normally, Java does its own garbage collection, detecting when an object is no longer needed. When you create objects by calling Java constructors from your non-native RPG procedure, Java has no way of knowing that the object can be destroyed, so it never destroys them. You can enable garbage collection for several objects at once by calling the JNI functions described in Telling Java to free several objects at once<
http://publib.boulder.ibm.com/infocenter/iadthelp/v7r0/topic/com.ibm.etools.iseries.pgmgd.doc/c0925076177.htm#wrpsevobj>.
If you know you are not going to need an object any more, you should tell this to Java by calling the JNI function described in Telling Java you are finished with a temporary object<
http://publib.boulder.ibm.com/infocenter/iadthelp/v7r0/topic/com.ibm.etools.iseries.pgmgd.doc/c0925076177.htm#wrpfintmp>
."
So, I guess IMHO I wouldn't even try it. It just seems like you would be doing a lot of work to get something to work that RPG already handles better.
--
James R. Perkins
http://twitter.com/the_jamezp
On Mon, Aug 24, 2009 at 08:00, Chris Beck <CBeck@xxxxxxxxxxxx> wrote:
Hello,
I am creating a RPG program that calls multiple Java method from RPG
and am having problems with one of them. In the code snippet below I
am wondering how to set the hxplvl6Class field to the propper value?
in Java I would just use the following: "Hxplvl6 hxplvl6 = em.find(Hxplvl6.class, l6number);"
D em...
D S O CLASS(*JAVA:
'javax.persistence.En+
D tityManager' )
D HxpLvl6 S O CLASS(*JAVA : 'java.lang.Object'
)
D hxplvl6Class S O CLASS(*JAVA : 'java.lang.Class' )
D l6Number S O CLASS(*JAVA : 'java.lang.Object'
)
D find PR O CLASS(*JAVA : 'java.lang.Object'
)
D EXTPROC(*JAVA :
'javax.persistence+
D .EntityManager' : 'find' )
D pmClass O CLASS(*JAVA : 'java.lang.Class' )
D pmKey O CLASS(*JAVA : 'java.lang.Object'
)
/Free
HxpLvl6 = find(em:hxplvl6Class:l6Number)
Thanks for any help,
Chris
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