I’m using db4o in a small project that works great on Android 2.2, 2.3,

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Asked: May 30, 20262026-05-30T01:50:15+00:00 2026-05-30T01:50:15+00:00

I’m using db4o in a small project that works great on Android 2.2, 2.3,

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I’m using db4o in a small project that works great on Android 2.2, 2.3, etc. On Honeycomb, however, database initialization results in the following error:

com.db4o.ext.Db4oException: File format incompatible: '/data/data/com.myapp/app_data/my_app.db4o'

This force close and the error occur on both a Xoom running Honeycomb and a Galaxy Tab running Honeycomb.

The relevant code is:

public ObjectContainer db() {
    // Create, open, and close the database
    try {
        if (oc == null || oc.ext().isClosed()) {
            oc = Db4oEmbedded
                    .openFile(dbConfig(), db4oDBFullPath(mContext));
        }
        return oc;
    } catch (Exception e) {
        Log.e(CFAApplication.TAG, e.toString());
        return null;
    }
}

private String db4oDBFullPath(Context ctx) {
    // Returns the path for the database location
    return ctx.getDir("data", 2) + "/" + "myapp.db4o";
}

public List<MyItem> getListItem(final String passedItemTitle) {
    List<MyItem> result = db().query(new Predicate<MyItem>() { // Error occurs here
        public boolean match(MyItem listItem) {
            if (passedItemTitle.equals(listItem.getTitle())) {
                return true;
            }
            return false;
        }
    });
    return result;
}

Is there some difference in the way Honeycomb handles its external file system? Is there anything I can change in the db4oDBFullPath() method that would make the two compatible? I’m really at a loss as to what’s happening that’s different. Maybe there are some Honeycomb-specific permissions that I need to enable?