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IM Facebook Java: A Guide to Using the Graph API with Java and Spring Boot



create a facebook application, if you don't already have one usable for this project !/developers/createapp.php-- and set sandbox/developer mode on! @ Advanced Settings > Sandbox Mode > Enable (Lets only the developers of your application see it.)You'll need the Application ID (APP_ID) and Secret Key (SECRET_KEY) that are listed on your developer account summary of that application but not the old API Key.




im facebook java




I figured out how to "retrieve" the offline access infinite session key after a lot of hair-splitting, some trial and error & wondering about all the other productive ways I could have spent that time... agree facebook documentation could be a lot better


2) As to how get the offline session key from the session..The trick is : when facebook redirects the user to the "next" url right after granting offline access, you should get the facebook session "again"..this new session will have the infinite session key.here is an example for mobile web...you should be able to figure it out for a regular website.The auth_token is used only for mobile web sites.. you may not need it for a regular web site


For session access, i had to use the loginurl provided by the facebook php api, as there seem to be 2/3 additional variables that it sends in the auth request, including return_session and session_version. Also the new php5-sdk sends the request to login.facebook.com instead of Here's how i worked it out :


The worst thing about the current facebook graph api is (correct me if I'm wrong) that the current api neglects the session (which seems to be a remain from the old api) in all its documentation and only talks about the access_token. But the current api (php5-sdk) has got no feature to send an actual request using only the access_token. If there is a function to start a session a session using only the access_token, I'm not aware of it.


hi,i have not much experience with json andperhabs i missed something, or i do not understand it. but you are passing the facebookId of the current user via javascript(json) to the webservice. is not this a security leak?


The endpoint can be found in the Facebook Graph API Reference. There you will find the correct syntax for the endpointand how the response json is defined by Facebook. The type you need to provide is a concrete mapping between the json and a java object.


RestFB tries to use slf4j. As soon as this logging library is included in the application, RestFB will use slf4j and you can use all the loggings frameworks, that slf4j can use. If no slf4j is found, RestFB uses java.util.logging as fallback. Then RestFB works exactly like the older version from the 1.x branch.RestFB can be forced to use java.util.logging - simply set the system property com.restfb.forceJUL to true. Then slf4j is ignored even though slf4j is on the classpath.


The Parameter class needs a name and a value to be sent to Facebook. The value is internally processed by ajson mapper, so you can provide a JsonObject, a primitive java type (like String, Boolean and so on), or a class that uses the @Facebook annotation (for example the RestFB types or custom ones).


AndroidJavaException: java.lang.ClassNotFoundException: com.facebook.unity.FB java.lang.ClassNotFoundException: com.facebook.unity.FB at java.lang.Class.classForName(Native Method) at java.lang.Class.forName(Class.java:324) at java.lang.Class.forName(Class.java:285) at com.unity3d.player.UnityPlayer.nativeRender(Native Method) at com.unity3d.player.UnityPlayer.c(Unknown Source) at com.unity3d.player.UnityPlayer$c$1.handleMessage(Unknown Source) at android.os.Handler.dispatchMessage(Handler.java:98) at android.os.Looper.loop(Looper.java:148) at com.unity3d.player.UnityPlayer$c.run(Unknown Source) Caused by: java.lang.ClassNotFoundException: Didn't find class "com.facebook.unity.FB" on path: DexPathList[[zip file "/data/app/com.redacted.redacted-1/base.apk"],nativeLibraryDirectories=[/data/app/com.redacted.redacted-1/lib/arm, /data/app/com.redacted.redacted-1/base.apk!/lib/armeabi-v7a, /vendor/lib, /system/lib]]


If App ID / App Secret / access token / access permission are listed in facebook4j.properties then, they are set in Facebook instance given back.See Configuration Facebook4J - A Java library for the Facebook Graph API for the detail.When they are not listed, it is setable later as follows:


Kotlin has single inheritance from a named superclass, and all Kotlin classes have a default superclass Any, which is not the same as the Java base class java.lang.Object. Any contains only three predefined member functions: equals(), hashCode(), and toString(). 2ff7e9595c


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