android - No default RealmConfiguration was found. Call setDefaultConfiguration() first -

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i'm using realm database android application. not sure why happens everytime uninstall app, first run crashes in activity on:

realm = realm.getdefaultinstance();

crash message:

caused by: java.lang.nullpointerexception: no default realmconfiguration found. call setdefaultconfiguration() first

in application class have this:

    @override     public void oncreate() {         super.oncreate();          realmconfiguration config = new realmconfiguration.builder(this)                 .name("mydb.realm")                 .deleterealmifmigrationneeded()                 .schemaversion(1)                 .migration(new migration())                 .build();         realm.setdefaultconfiguration(config);         //...crashlytics , other things...      }

all future runs after crash ok. ideas?

i found problem. realm had nothing it. custom application's oncreate never called on first app run because of allowbackup attribute in manifest. setting false fixed issue.


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