Jackson Custom Null Serializer' title='Jackson Custom Null Serializer' />Only serialize fields that meet your custom criteria using Jackson 2. Introducing Thymeleaf 1. What is Thymeleaf Thymeleaf is a modern serverside Java template engine for both web and standalone environments, capable of processing. Android 6. 0 You CAN NO longer access the Mac Address You can Okay thats new to us android developers You can no longer get the hardware MAC address of a android device. Wifi. Info. get. Mac. Address and Bluetooth. Adapter. get. Address methods will return 0. This restriction was introduced in Android 6. I wanted to know if this is true. So I tested this on my One. Plus One Android 6. Cyanogen. private String get. Jackson Custom Null Serializer' title='Jackson Custom Null Serializer' />Mac. Address         try             Context cntxt get. Application. Context            Wifi. Manager wifi Wifi. Manager cntxt. get. System. ServiceContext. WIFISERVICE            ifwifi null return Failed Wi. Fi. Manager is null            Wifi. Info info wifi. Connection. Info            ifinfo null return Failed Wifi. Info is null            return info. Mac. Address        catch Exception e             e. Stack. Trace            return Nothing    Result ISystem. My android 6. 0 mac address 0. This proves that you can not access the mac addess with the Android API. BUT I found an alternative way to get the MAC addr on a Android 6. First add Internet User Permission to your Android. Manifest. xml lt uses permission android nameandroid. INTERNET With this code I was able to figure out my mac on a android 6. String get. Mac. Addr         try             Listlt Network. Interface all Collections. Network. Interface. Network. Interfaces            for Network. Interface nif all                 if Name. Ignore. Casewlan. Bytes nif. get. Hardware. Address                if mac. Bytes null                     return                                 String. Builder res. 1 new String. Builder                for byte b mac. Manual Del Tractor Agricola Ford 6600 Manual. Bytes                     res. Integer. to. Hex. Stringb 0x. FF                                 if res. Char. Atres. 1. length 1                                return res. String                    catch Exception ex                 return 0. Feel free to use this in all your projects. If you use this in a commercial project dont forget to donate One thing that you have to keep in mind On some devices the interface is not called wlan. You need to adjust that.