RE: Type problems with PL/SQL function as a Java wrapper.

From: Ganesh Raja <rlnsimha_at_emirates.net.ae>
Date: Tue, 04 Jun 2002 11:51:13 -0800
Message-ID: <F001.00473F7C.20020604115113@fatcity.com>

Main is a reserved function in Java you cannot use that in your programs.

I just did this by changing the name to test. And it works.

HTH Best Regards,
Ganesh R

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---

 

-----Original Message-----
Rich
Sent: Tuesday, June 04, 2002 9:09 PM
To: Multiple recipients of list ORACLE-L

Hey all,

Trying to get into this new fangled "Java" thingy in 8.1.7.2.0 on HP/UX. Simple OS exec test, mostly plagarized:

// qlp.java

import java.lang.Runtime;
import java.lang.Process;
import java.io.IOException;
import java.lang.InterruptedException;

public class qlp {

        public static int main(String args) {

        int retval = 0;

	try {
		String	lpCommand;
		lpCommand = "/usr/bin/lp " + args;

		Process p = Runtime.getRuntime().exec(lpCommand);

		try {
			p.waitFor();

	     } catch (InterruptedException intexc) {
		System.out.println("Interrupted Exception on waitFor: "
+ intexc.getMessage());
	     }

	retval = p.exitValue();

	} catch (IOException e) {
		e.printStackTrace();
	}

	return (retval);

   }
}

// End of Java code

I run javac to compile it, then loadjava the class file into the DB. I can then create a PL/SQL procedure as a wrapper:

CREATE OR REPLACE PROCEDURE qlp_proc (file_and_parms IN VARCHAR2) AS LANGUAGE JAVA
NAME 'qlp.main (java.lang.String[])';
/

And it works, but I need to test for success/fail. But if I try a FUNCTION
wrapper:

CREATE OR REPLACE FUNCTION qlp_func (file_and_parms IN VARCHAR2) RETURN NUMBER AS LANGUAGE JAVA
NAME 'qlp.main (java.lang.String[]) return int'; /

I get PLS-00311: the declaration of "qlp.main (java.lang.String[]) return int" is incomplete or malformed.

Two questions: 1) Every example I've seen of the wrapper excludes the brackets from the java.lang.String parameter def, but I can't get a compile
without it. Why? And 2) Anyone know what's wrong with my FUNCTION def?

Desperately needing a good Java tutorial, too!

TIA!

Rich Jesse                           System/Database Administrator
Rich.Jesse_at_qtiworld.com              Quad/Tech International, Sussex, WI

USA

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Author: Ganesh Raja
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Received on Tue Jun 04 2002 - 14:51:13 CDT