RealmFileException: Not a Realm file & Permission denied

[watabee]

Expected Results

No crash.

Actual Results

We updated Realm version from 1.0.0 to 4.3.1, then We've got some crash reported by crashlytics.

# OS Version: 6.0.1
# Device: Nexus 7 (2013)
# RAM Free: 31.3%
# Disk Free: 22%

Fatal Exception: io.realm.exceptions.RealmFileException: Unable to open a realm at path '/data/data/our.package/files/default.realm': Not a Realm file. (Not a Realm file) (/data/data/our.package/files/default.realm) in /Users/cm/Realm/realm-java-release/realm/realm-library/src/main/cpp/io_realm_internal_OsSharedRealm.cpp line 101
       at io.realm.internal.OsSharedRealm.nativeGetSharedRealm(OsSharedRealm.java)
       at io.realm.internal.OsSharedRealm.(OsSharedRealm.java)
       at io.realm.internal.OsSharedRealm.getInstance(OsSharedRealm.java:254)
       at io.realm.internal.OsSharedRealm.getInstance(OsSharedRealm.java:244)
       at io.realm.RealmCache.doCreateRealmOrGetFromCache(RealmCache.java:319)
       at io.realm.RealmCache.createRealmOrGetFromCache(RealmCache.java:282)
       at io.realm.Realm.getDefaultInstance(Realm.java:332)

# OS Version: 6.0.1
# Device: Xperia Z3 Compact
# RAM Free: 50.2%
# Disk Free: 6.5%

Fatal Exception: io.realm.exceptions.RealmFileException: Unable to open a realm at path '/data/data/our.package/files/default.realm.lock'. Please use a path where your app has read-write permissions. (open("/data/data/our.package/files/default.realm.lock") failed: Permission denied) (/data/data/our.package/files/default.realm.lock) in /Users/cm/Realm/realm-java-release/realm/realm-library/src/main/cpp/io_realm_internal_OsSharedRealm.cpp line 101
       at io.realm.internal.OsSharedRealm.nativeGetSharedRealm(OsSharedRealm.java)
       at io.realm.internal.OsSharedRealm.(OsSharedRealm.java)
       at io.realm.internal.OsSharedRealm.getInstance(OsSharedRealm.java:254)
       at io.realm.BaseRealm.(BaseRealm.java)
       at io.realm.BaseRealm.(BaseRealm.java)
       at io.realm.Realm.(Realm.java)
       at io.realm.Realm.createInstance(Realm.java:424)
       at io.realm.RealmCache.doCreateRealmOrGetFromCache(RealmCache.java:342)
       at io.realm.RealmCache.createRealmOrGetFromCache(RealmCache.java:282)
       at io.realm.Realm.getDefaultInstance(Realm.java:332)

Steps & Code to Reproduce

Sorry, we couldn't reproduce this crash.

Code Sample

// onCreate() in Application 
Realm.init(this);
RealmConfiguration config = new RealmConfiguration.Builder()
        .schemaVersion(7)
        .migration(new Migration())
        .build();
Realm.setDefaultConfiguration(config);

// onResume() in Activity
final Realm realm = Realm.getDefaultInstance(); // Crash

Version of Realm and tooling

Realm version(s): 4.3.1

Realm sync feature enabled: no

Android Studio version: 3.0.1

Which Android version and device:

• Nexus 7 6.0.1
• Xperia Z3 Compact 6.0.1
• Nexus5 6.0.1
• AQUOS EVER SH-04G 5.0.2
• Xperia Z Ultra 4.4.2
• and so on.

How can we solve this problem? Thanks.

I'm sorry for my poor english.

[beeender]

The first one feels like a db file corruption.

The 2nd one seems to a similar issue described here #3972 (comment)

But without a reproduce case, it is hard to tell the what is problem (could be problem in the device side :( )

[watabee]

OK, if I could reproduce this case, I reopen this issue.
Thanks!

[i-m-aman]

have you ever been able to reproduce this issue??