NullPointerException at java.util.logging.Logger.log

[Chaitanya Bhagvan]

I am trying to port my android code to IOS using robovm. I am trying to use smack xmpp library version 4.1.4. When I run the app I get the following exception caused by a NullPointerException in java.util.logging.Logger 

java.lang.ExceptionInInitializerError

at org.jivesoftware.smack.SmackConfiguration.getVersion(SmackConfiguration.java:96)

at org.jivesoftware.smack.provider.ProviderManager.<clinit>(ProviderManager.java:121)

at com.wandergyd.milu.core.chat.ChatClient.<clinit>(ChatClient.java:44)

at com.wandergyd.milu.MyViewController.viewDidLoad(MyViewController.java)

at com.wandergyd.milu.MyViewController.$cb$viewDidLoad(MyViewController.java)

at org.robovm.apple.uikit.UIApplication.main(Native Method)

at org.robovm.apple.uikit.UIApplication.main(UIApplication.java:384)

at com.wandergyd.milu.Main.main(Main.java)

Caused by: java.lang.IllegalStateException: java.lang.NullPointerException

at org.jivesoftware.smack.SmackInitialization.<clinit>(SmackInitialization.java:120)

... 8 more

Caused by: java.lang.NullPointerException

at java.util.logging.Logger.log(Logger.java:1035)

at java.util.logging.Logger.log(Logger.java:994)

at org.jivesoftware.smack.initializer.UrlInitializer.initialize(UrlInitializer.java:63)

at org.jivesoftware.smack.SmackInitialization.loadSmackClass(SmackInitialization.java:233)

at org.jivesoftware.smack.SmackInitialization.parseClassesToLoad(SmackInitialization.java:194)

at org.jivesoftware.smack.SmackInitialization.processConfigFile(SmackInitialization.java:164)

at org.jivesoftware.smack.SmackInitialization.processConfigFile(SmackInitialization.java:149)

at org.jivesoftware.smack.SmackInitialization.<clinit>(SmackInitialization.java:117)

... 8 more

The Logger class is coming from robovm 1.8.0 

I am using xcode 7 on Mac OSX 10.10 

Not sure what the problem is. 

Could I please get some help on this, I am trying to evaluate whether I can use RoboVM to run my app on IOS. 

[Chaitanya Bhagvan]

Got it work by adding 

<forceLinkClasses>

        <pattern>java.util.logging.ConsoleHandler</pattern>

        <pattern>java.util.logging.SimpleFormatter</pattern>

</forceLinkClasses>