Multiple JREs installed - how to select correct one?

Hi all
I have multiple JREs installed on my computer, which I need to keep.
I'm doing some development, and when I try to run the class, I get the following error:
Exception in thread "main" java.lang.UnsupportedClassVersionError: HelloWorldApp
(Unsupported major.minor version 50.0)
        at java.lang.ClassLoader.defineClass0(Native Method)
        at java.lang.ClassLoader.defineClass(Unknown Source)
        at java.security.SecureClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.access$100(Unknown Source)
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClassInternal(Unknown Source)java -version shows:
java version "1.3.1_01"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.1_01)
Java HotSpot(TM) Client VM (build 1.3.1_01, mixed mode)The reason I'm getting this error is because Eclipse is using the following JRE:
C:\Program Files\Java\jre6\bin>java -version
java version "1.6.0_17"
Java(TM) SE Runtime Environment (build 1.6.0_17-b04)
Java HotSpot(TM) Client VM (build 14.3-b01, mixed mode, sharing)My Path environment variable is:
C:\Program Files\Java\jre6;C:\oracle\ora92\bin;C:\Program Files\Oracle\jre\1.3.1\bin;C:\Program Files\Oracle\jre\1.1.8\bin;%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;C:\Program Files\Intel\DMIX;C:\Program Files\Gemalto\GACMy CLASSPATH environment variable is:
C:\Program Files\Java\jre6;C:\Program Files\gemalto\gac\GATicket.jar;How do I force my Windows XP system to use the latest JRE installed?
Thanks

Thanks again.
However, it appears the PATH variable may be a red herring.
If I set the class path to exclude the jre6 directory, as follows:
C:\oracle\ora92\bin;C:\Program Files\Oracle\jre\1.3.1\bin;C:\Program Files\Oracle\jre\1.1.8\bin;%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;C:\Program Files\Intel\DMIX;C:\Program Files\Gemalto\GACThen the following error occurs:
C:\Documents and Settings\Me\workspace\RegexTestProject\bin\regextest>java -
version
java version "1.3.1_01"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.1_01)
Java HotSpot(TM) Client VM (build 1.3.1_01, mixed mode)
C:\Documents and Settings\Me\workspace\RegexTestProject\bin\regextest>dir
Volume in drive C has no label.
Volume Serial Number is 2806-C30D
Directory of C:\Documents and Settings\Me\workspace\RegexTestProject\bin\re
gextest
03/09/2010 13:55    <DIR>          .
03/09/2010 13:55    <DIR>          ..
03/09/2010 13:56             1,707 RegexTestHarness.class
               1 File(s)          1,707 bytes
               2 Dir(s) 11,257,622,528 bytes free
C:\Documents and Settings\Me\workspace\RegexTestProject\bin\regextest>java R
egexTestHarness
Exception in thread "main" java.lang.UnsupportedClassVersionError: RegexTestHarn
ess (Unsupported major.minor version 50.0)
        at java.lang.ClassLoader.defineClass0(Native Method)
        at java.lang.ClassLoader.defineClass(Unknown Source)
        at java.security.SecureClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.access$100(Unknown Source)
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClassInternal(Unknown Source)This is expected as the class was compiled using a later version of the JDK.
However, if I update the PATH, and add the JRE6 entry to the path as follows:
C:\Program Files\Java\jre6\bin;C:\oracle\ora92\bin;C:\Program Files\Oracle\jre\1.3.1\bin;C:\Program Files\Oracle\jre\1.1.8\bin;%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;C:\Program Files\Intel\DMIX;C:\Program Files\Gemalto\GACI then get a class not found exception!!??
C:\Documents and Settings\Me\workspace\RegexTestProject\bin\regextest>java -
version
java version "1.6.0_17"
Java(TM) SE Runtime Environment (build 1.6.0_17-b04)
Java HotSpot(TM) Client VM (build 14.3-b01, mixed mode, sharing)
C:\Documents and Settings\Me\workspace\RegexTestProject\bin\regextest>dir
Volume in drive C has no label.
Volume Serial Number is 2806-C30D
Directory of C:\Documents and Settings\Me\workspace\RegexTestProject\bin\re
gextest
03/09/2010 13:55    <DIR>          .
03/09/2010 13:55    <DIR>          ..
03/09/2010 13:56             1,707 RegexTestHarness.class
               1 File(s)          1,707 bytes
               2 Dir(s) 11,257,618,432 bytes free
C:\Documents and Settings\Me\workspace\RegexTestProject\bin\regextest>java R
egexTestHarness
Exception in thread "main" java.lang.NoClassDefFoundError: RegexTestHarness (wro
ng name: regextest/RegexTestHarness)
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(Unknown Source)
        at java.security.SecureClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.access$000(Unknown Source)
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClassInternal(Unknown Source)
Could not find the main class: RegexTestHarness. Program will exit.Below is the code of the class:
package regextest;
import java.io.Console;
import java.util.regex.Pattern;
import java.util.regex.Matcher;
public class RegexTestHarness {
    public static void main(String[] args){
        Console console = System.console();
        if (console == null) {
            System.err.println("No console.");
            System.exit(1);
        while (true) {
            Pattern pattern =
            Pattern.compile(console.readLine("%nEnter your regex: "));
            Matcher matcher =
            pattern.matcher(console.readLine("Enter input string to search: "));
            boolean found = false;
            while (matcher.find()) {
                console.format("I found the text \"%s\" starting at " +
                   "index %d and ending at index %d.%n",
                    matcher.group(), matcher.start(), matcher.end());
                found = true;
            if(!found){
                console.format("No match found.%n");
}Based on the above, I think the path is set correctly, but I'm doing something else wrong.
Thanks for you help so far. :-)

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