Though variables have been initialized I get might not have been initialized error

I am having problem with the following code in an android app that I am developing. Now even though I have initialized the variables I am getting the error variable might not have been initialized.

Activity context;
context = new Activity();
SimpleSpkDetSystem alizeSystem;
try {
    InputStream configAsset = context.getApplicationContext().getAssets().open("MyConfig.cfg");
    try {
        alizeSystem = new SimpleSpkDetSystem(configAsset, context.getApplicationContext().getFilesDir().getPath());
    } catch (AlizeException e) {
        Log.e(LOG_TAG, "File not found for recording ", e);
    }
    configAsset.close();

} catch (java.io.IOException e) {
    Log.e(LOG_TAG, "File not found for recording ", e);
}
InputStream backgroundModelAsset;
try {
    backgroundModelAsset = context.getApplicationContext().getAssets().open("gmm/world.gmm");
} catch (java.io.IOException e) {
    Log.e(LOG_TAG, "File not found for recording ", e);
}
try {
    alizeSystem.loadBackgroundModel(backgroundModelAsset);
} catch (AlizeException e) {
    Log.e(LOG_TAG, "File not found for recording ", e);
}
try {
    backgroundModelAsset.close();
} catch (java.io.IOException e) {
    Log.e(LOG_TAG, "File not found for recording ", e);
}

The following are the errors I am getting

Error:(274, 13) error: variable alizeSystem might not have been initialized
Error:(274, 45) error: variable backgroundModelAsset might not have been initialized
Error:(279, 9) error: variable backgroundModelAsset might not have been initialized
Error:(274, 44) error: unreported exception IOException; must be caught or declared to be thrown