{"action":"created","comment":{"url":"https://api.github.com/repos/realm/realm-java/pulls/comments/30793544","id":30793544,"diff_hunk":"@@ -278,6 +278,10 @@ string concat_stringdata(const char *message, StringData strData)\n \n jstring to_jstring(JNIEnv* env, StringData str)\n {\n+    if (str.is_null()) {\n+        return NULL;","path":"realm-jni/src/util.cpp","position":5,"original_position":5,"commit_id":"418ec513e05147c36f8023e26bfbc4f20b903a92","original_commit_id":"e4bcc141d6b5dd1b8f79fcb216148b5f8ed69676","user":{"login":"kneth","id":1225363,"avatar_url":"https://avatars.githubusercontent.com/u/1225363?v=3","gravatar_id":"","url":"https://api.github.com/users/kneth","html_url":"https://github.com/kneth","followers_url":"https://api.github.com/users/kneth/followers","following_url":"https://api.github.com/users/kneth/following{/other_user}","gists_url":"https://api.github.com/users/kneth/gists{/gist_id}","starred_url":"https://api.github.com/users/kneth/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/kneth/subscriptions","organizations_url":"https://api.github.com/users/kneth/orgs","repos_url":"https://api.github.com/users/kneth/repos","events_url":"https://api.github.com/users/kneth/events{/privacy}","received_events_url":"https://api.github.com/users/kneth/received_events","type":"User","site_admin":false},"body":"`to_string()` is an aux. function and not a method. It does not have access to `m_is_null`.","created_at":"2015-05-21T11:33:30Z","updated_at":"2015-05-21T11:33:30Z","html_url":"https://github.com/realm/realm-java/pull/1098#discussion_r30793544","pull_request_url":"https://api.github.com/repos/realm/realm-java/pulls/1098","_links":{"self":{"href":"https://api.github.com/repos/realm/realm-java/pulls/comments/30793544"},"html":{"href":"https://github.com/realm/realm-java/pull/1098#discussion_r30793544"},"pull_request":{"href":"https://api.github.com/repos/realm/realm-java/pulls/1098"}}},"pull_request":{"url":"https://api.github.com/repos/realm/realm-java/pulls/1098","id":34919223,"html_url":"https://github.com/realm/realm-java/pull/1098","diff_url":"https://github.com/realm/realm-java/pull/1098.diff","patch_url":"https://github.com/realm/realm-java/pull/1098.patch","issue_url":"https://api.github.com/repos/realm/realm-java/issues/1098","number":1098,"state":"open","locked":false,"title":"[WIP] Support for null strings","user":{"login":"kneth","id":1225363,"avatar_url":"https://avatars.githubusercontent.com/u/1225363?v=3","gravatar_id":"","url":"https://api.github.com/users/kneth","html_url":"https://github.com/kneth","followers_url":"https://api.github.com/users/kneth/followers","following_url":"https://api.github.com/users/kneth/following{/other_user}","gists_url":"https://api.github.com/users/kneth/gists{/gist_id}","starred_url":"https://api.github.com/users/kneth/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/kneth/subscriptions","organizations_url":"https://api.github.com/users/kneth/orgs","repos_url":"https://api.github.com/users/kneth/repos","events_url":"https://api.github.com/users/kneth/events{/privacy}","received_events_url":"https://api.github.com/users/kneth/received_events","type":"User","site_admin":false},"body":"Support for null values is a popular feature request (see #478). Realm Core has an experimental/work-in-progress version with support for null strings. In order to validate the concept of null strings, Realm for Android is experimentally adding support for it.\r\n\r\nA new annotation (`@NotNNullable) is introduced. `String`s are nullable by default, but you can specify that it is not nullable. Moreover, primary keys cannot be null.\r\n\r\nQuerying with null has a special semantic. Every string begins with, ends with and contains null strings.\r\n\r\nIf a field is nullable, the default value when creating an object is null while a not nullable string field is the empty string (`\"\"`) in Realm. The JSON methods in Realm and the proxy classes follow these rules too.\r\n\r\n**Note**: This branch will _not_ be merged into master for a while.\r\n\r\nTODO:\r\n - [x] Basic support for strings (insert, retrieve, query)\r\n - [ ] Migration\r\n - [ ] JSON\r\n\r\n@bmunkholm @emanuelez 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