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  1.  Home
  2. JAVA400-L
  3. October 2012

RE: Dynamic java for Excel spreadsheet

Have you experimented with beanShell? Might get you around some barriers. Generate the method for one cell, evaluate it in beanShell, repeat. Keep reusing the same object so you don't let RPG run up memory as it doesn't release objects to the garbage collector.

-----Original Message-----
From: java400-l-bounces@xxxxxxxxxxxx [mailto:java400-l-bounces@xxxxxxxxxxxx] On Behalf Of darren@xxxxxxxxx
Sent: Tuesday, October 02, 2012 7:19 AM
To: Java Programming on and around the IBM i
Subject: Re: Dynamic java for Excel spreadsheet

Things were looking good until I expanded my test and found that there is a 64KB bytecode limit on methods. Rats.




From: darren@xxxxxxxxx
To: java400-l@xxxxxxxxxxxx,
Date: 09/28/2012 10:38 AM
Subject: Dynamic java for Excel spreadsheet
Sent by: java400-l-bounces@xxxxxxxxxxxx




We have run into various memory and performance issues using the JNI interface from RPG to Java to generate spreadsheets using the POI HSSF API's. Sometimes to get around this, we generate the spreadsheet in a .CSV format, but this obviously generates a pretty ugly output when imported into Excel. I'm currently researching generating the java code dynamically in an RPG program, compiling it, and running that, meaning that the there would be at least one java code source record for every cell on the spreadsheet. I believe that the resulting program would perform much better than the JNI interface does. Does anyone see any show stoppers with this approach? Anyone tried something like this before?

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