Hi All,

I'm starting some experiments writing java code to connect to an Ingres database.

I'm using a Linux box to develop.

I've set CLASSPATH to $II_SYSTEM/ingres/lib/iijdbc.jar:.

The initial code compiles OK with javac, but when I attempt to execute the class I get:
Exception in thread "main" java.lang.ClassFormatError: com.ingres.jdbc.IngresDriver (unrecognized class file version)

Any ideas what I'm missing?

Marty

Martin Bowes wrote:

That rings a bell. I think I ran into that last year some time. My
java and javac versions where out of sync.

--
Roy

UK Actian User Association Conference 2012 will be on Tuesday June 19 2012.
Register now at https://www.regonline.co.uk/ukiua2012
The latest information is available from www.uk-iua.org.uk.

What version of Java are you using? Is it possible you're picking up
javac from a later version than java itself?



Java -version

Javac -version



From: info-ingres-bounces (AT) kettleriver...ting (DOT) com
[mailto:info-ingres-bounces (AT) kettleriverconsulting (DOT) com] On Behalf Of
Martin Bowes
Sent: 14 May 2012 13:56
To: info-ingres (AT) kettleriverconsulting (DOT) com
Subject: [Info-Ingres] Newby Java connection issue



Hi All,



I'm starting some experiments writing java code to connect to an Ingres
database.



I'm using a Linux box to develop.



I've set CLASSPATH to $II_SYSTEM/ingres/lib/iijdbc.jar:.



The initial code compiles OK with javac, but when I attempt to execute
the class I get:

Exception in thread "main" java.lang.ClassFormatError:
com.ingres.jdbc.IngresDriver (unrecognized class file version)



Any ideas what I'm missing?



Marty

Hi Roy,

java --version
java version "1.4.2"
gij (GNU libgcj) version 4.1.1 20070105 (Red Hat 4.1.1-52)

Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

javac -version
Eclipse Java Compiler v_677_R32x, 3.2.1 release, Copyright IBM Corp 2000, 2006. All rights reserved.

Marty
From: Martin Bowes [mailto:martin.bowes (AT) ctsu (DOT) ox.ac.uk]
Sent: 14 May 2012 13:56
To: info-ingres (AT) kettleriverconsulting (DOT) com
Subject: [Info-Ingres] Newby Java connection issue

Hi All,

I'm starting some experiments writing java code to connect to an Ingres database.

I'm using a Linux box to develop.

I've set CLASSPATH to $II_SYSTEM/ingres/lib/iijdbc.jar:.

The initial code compiles OK with javac, but when I attempt to execute the class I get:
Exception in thread "main" java.lang.ClassFormatError: com.ingres.jdbc.IngresDriver (unrecognized class file version)

Any ideas what I'm missing?

Marty

Martin Bowes wrote:

I have no idea if those are compatible.

My java dev system shows:

c:\temp>javac -version
javac 1.6.0_22

c:\temp>java -version
java version "1.6.0_22"
Java(TM) SE Runtime Environment (build 1.6.0_22-b04)
Java HotSpot(TM) Client VM (build 17.1-b03, mixed mode, sharing)

--
Roy

UK Actian User Association Conference 2012 will be on Tuesday June 19 2012.
Register now at https://www.regonline.co.uk/ukiua2012
The latest information is available from www.uk-iua.org.uk.

Ok a fresh install: yum install *jdk* and suddenly java and javac have the same version and the test program is now working!

Hurrah!

Marty

From: Martin Bowes [mailto:martin.bowes (AT) ctsu (DOT) ox.ac.uk]
Sent: 14 May 2012 13:56
To: info-ingres (AT) kettleriverconsulting (DOT) com
Subject: [Info-Ingres] Newby Java connection issue

Hi All,

I'm starting some experiments writing java code to connect to an Ingres database.

I'm using a Linux box to develop.

I've set CLASSPATH to $II_SYSTEM/ingres/lib/iijdbc.jar:.

The initial code compiles OK with javac, but when I attempt to execute the class I get:
Exception in thread "main" java.lang.ClassFormatError: com.ingres.jdbc.IngresDriver (unrecognized class file version)

Any ideas what I'm missing?

Marty

Not sure what Ingres JDBC driver you are using but 4.0.x requires Java
1.6 as a minimum.

See 'Ingres Java Development Center/Ingres Java Learn - Ingres Community
Wiki' (http://tinyurl.com/79trl7z) for minimum JRE versions for various
Ingres JDBC drivers.

Regards,
Teresa


--
teresa