SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".

[tva77]

tva@TVAMacBookPro:~/projetos/push-notification-server$ javac -cp apns.jar:. IOSPush.java tva@TVAMacBookPro:~/projetos/push-notification-server$ java -cp apns.jar:. IOSPush SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder". SLF4J: Defaulting to no-operation (NOP) logger implementation SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details. Exception in thread "main" java.lang.RuntimeException: Invalid hex character: x at com.notnoop.apns.internal.Utilities.charval(Utilities.java:125) at com.notnoop.apns.internal.Utilities.decodeHex(Utilities.java:112) at com.notnoop.apns.EnhancedApnsNotification.<init>(EnhancedApnsNotification.java:72) at com.notnoop.apns.internal.AbstractApnsService.push(AbstractApnsService.java:52) at com.notnoop.apns.internal.ApnsServiceImpl.push(ApnsServiceImpl.java:36) at IOSPush.main(IOSPush.java:26)