OK guys, I'm real sorry for acting like a complete moron, but I found
the problem. It was a simple matter of reading
http://developer.db4o.com/Resources/view.aspx/Reference/Platform_Specific_Issues/Android
and figuring out that I need to use db4o v1.1 instead of 5.0, like
I've been using. :-s The rest was a breeze...
Serves me right for not reading every piece of documentation and
jumping right in. It could've saved me the past 3 or 4 days worth of
frustration...
Thanks anyway. I wish I could delete this somehow... :p
Cheers!
On Jul 8, 12:55 pm, Ivan Mirić <[EMAIL PROTECTED]> wrote:
> Hi, I hope this is the right place to ask this question, as I've
> nowhere to turn and the db4o forums are desolate, especially when it
> comes to Android support.
>
> I am having a problem opening or creating a db4o database, as I
> receive a NullPointerException from the Activity I try to access the
> database.
>
> Here is part of my DbHelper class:
>
> private Context context;
> private static ObjectContainer oc = null;
>
> public DbHelper(Context ctx) {
> context = ctx;
> }
> private ObjectContainer db() {
> try {
> if(oc == null || oc.ext().isClosed())
> oc = Db4o.openFile(dbConfig(),
> db4oDBFullPath(context));
> return oc;
> } catch (Db4oException e) {
> Log.e(DbHelper.class.getName(), e.toString());
> return null;
> }
> }
>
> private Configuration dbConfig(){
> Configuration c = Db4o.newConfiguration();
>
> c.objectClass(Materia.class).objectField("codigo").indexed(true);
> return c;
> }
>
> private String db4oDBFullPath(Context ctx) {
> String dir = ctx.getFilesDir().getParent() + "/databases/";
> File datafile = new File(dir, "sas.db4o");
> return datafile.getAbsolutePath();
> }
>
> public void addMateria(String codigo, String nombre) {
> db().store(new Materia(codigo, nombre));
> db().commit();
> }
>
> Then, to actually store a Materia object from my Activity class I do:
> DbHelper db = new DbHelper(this);
> db.addMateria("ISC304", "Programacion II");
>
> And this is where I recieve the NullPointerException (in
> db().store(new Materia(codigo, nombre)); ). Upon debugging, I noticed
> that db() actually returns null, and a Db4oIOException is launched on
> that line, which in turn launches the NullPointerException in the VM.
> Here is the actual error logged:
>
> ERROR/com.android.sas.db.DbHelper(1129):
> com.db4o.ext.Db4oIOException: /data/data/com.android.sas/databases/
> sas.db4o
>
> At first I thought it was a problem with the pathname, but I have
> confirmed from the docs that /data/data/<package>/databases should
> house all databases the application uses, so I'm pretty sure that's
> not it.
>
> As the db4o for Android support is pretty scarce on the db4o side, I'd
> be thankful if someone here could help me to figure out what's causing
> this problem. Let me know if you need anymore information.
>
> Thanks in advance!
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