Where are the Java preferences stored in Windows 7?

We use the Java preferences in some of our apps and haven't really noticed this since the utility that makes the calls is fairly old and was written in Windows XP days. But it seems the Java preferences are no longer stored in the registry in Windows 7 - or they are stored somewhere different.

I'm expecting it to be in:

HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Prefs

But I don't see it there.

What makes it wierder, is that when I run this app:

public static void main( final String[] args ) throws BackingStoreException {

    Preferences systemRoot = Preferences.systemRoot();
    Preferences preferences = systemRoot.node( "com/mycompany/settings" );

    systemRoot.put( "foo", "bar" );
    systemRoot.put( "baz", "lolz" );
    System.out.println( "-------------------------------" );

    String[] keys = preferences.keys();
    for( String key : keys ) {
        System.out.println( key );
    }

    System.out.println( "-------------------------------" );

    keys = systemRoot.keys();
    for( String key : keys ) {
        System.out.println( key );
    }
}

It actually writes (I can comment the put out and run it again and it works) but I don't see the new keys in the registry.

Also, I can't seem to see this documented anywhere. Thanks in advance.

EDIT #1 The only reason this matters is that the setting changes dependent upon which environment it is ran. This being said, it is often useful to simulate that environment by inserting the registry keys manually and then doing some checking.

I was running as admin, yet I did not see the keys in the registry where I expected them to be.

Solution 1:

They are under current user: HKEY_CURRENT_USER\Software\JavaSoft\Prefs

Solution 2:

for systemRoot:

HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\...

for userRoot:

HKEY_CURRENT_USER\SOFTWARE\JavaSoft\...

Solution 3:

I had a similar problem when I worked with systemRoot preferences and with the help of a registry monitor I discovered that the location where they are stored changes depending on if the Windows operating system is 32-bit or 64-bit.

Under 32bit OS (Windows XP in my case) the systemRoot registry path was

HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Prefs

Under 64bit OS (Windows 7 in my case) the systemRoot registry path was

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\JavaSoft\Prefs

The same 32-bit JRE (JRE 1.6.0_20-b02) was used on both systems.

When running a 32-bit application (the JVM) on a 64-bit windows the registry automatically inserts the Wow6432Node path element to allow for applications compiled for either 32-bit or 64-bit to co-exist on the same machine while keeping their settings separate.