Bug in JVM causing problems with MessageTranslator

From: Darin Ohashi <DOhashi(at)maplesoft(dot)com>
To: pgsql-jdbc(at)postgresql(dot)org
Subject: Bug in JVM causing problems with MessageTranslator
Date: 2003-08-08 19:15:55
Message-ID: F17255C2B596D3119A5600508B44FA68052EB8C1@courier.maplesoft.on.ca
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Lists: pgsql-jdbc

This code works fine under linux and other unix platforms, but it fails on
windows (2000). It looks like the error message resource (which is loaded by
the Message Translator singleton) is not loaded if the jdbc classes are loaded
with a class loader other than the default. This behaviour looks like a bug in
jdk version (1.4.0) that I am using, however I though you might be interested
(espeically if this still occurs with new jdks). For this to "work"
pg73jdbc3.jar should not be in the classpath.

import java.sql.*;
import java.util.Properties;
import java.net.URLClassLoader;
import java.net.URL;

class SQLTest
public static void main( String args[] )
throws Exception
Driver driver;
Connection con;
Properties prop;
URL urls[];
URLClassLoader loader;

urls = new URL[1];

driver = null;

urls[0] = new URL( "file://c:/path/to/pg73jdbc3.jar" );
loader = new URLClassLoader( urls );

driver = (Driver)loader.loadClass( "org.postgresql.Driver"
catch ( Exception e )
System.out.println( e.toString() );
System.exit( 0 );

//driver = (Driver)Class.forName( "org.postgresql.Driver"

prop = new Properties();

prop.setProperty( "user", "test" );
prop.setProperty( "password", "test" );
con = driver.connect( "jdbc:postgresql://somehost/TestDB", prop );

con.setTransactionIsolation( Connection.TRANSACTION_READ_UNCOMMITTED
catch ( Exception e )
System.out.println( e.getMessage() );
throw e;

It produces this output:

Exception in thread "main" postgresql.con.isolevel
at org.postgresql.jdbc1.AbstractJdbc1Connection.setTransactionIsolation(
at SQLTest.main(SQLTest.java:45)

It looks like ResourceBundle uses the default class loader when trying to load
the resources, thus it does not find them. I think it should be using the class
loader that was used to load the ResourceBundle, (which has access to the
correct jar file).

Does anyone know of a good work around for this problem? My current plan is to
preemptively load MessageTranslator when I load Driver. That should work, but
its a bit ugly.


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