NoClassFoundEception on PingManager

I am using following dependencies

compile "org.igniterealtime.smack:smack-android-extensions:$smackVersion"
compile "org.igniterealtime.smack:smack-experimental:$smackVersion"
compile “org.igniterealtime.smack:smack-tcp:$smackVersion”

Where smack version is

ext {

smackVersion = ‘4.1.6’ //Also tried with 4.1.5
}

I am getting following logcat exception

java.lang.RuntimeException: Unable to create application com.app.data.Application: java.lang.RuntimeException: java.lang.ClassNotFoundException: com.app.data.connection.ConnectionManager

at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4733)

at android.app.ActivityThread.access$1600(ActivityThread.java:175)

at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1368)

at android.os.Handler.dispatchMessage(Handler.java:102)

at android.os.Looper.loop(Looper.java:146)

at android.app.ActivityThread.main(ActivityThread.java:5602)

at java.lang.reflect.Method.invokeNative(Native Method)

at java.lang.reflect.Method.invoke(Method.java:515)

at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283 )

at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)

at dalvik.system.NativeStart.main(Native Method)

Caused by: java.lang.RuntimeException: java.lang.ClassNotFoundException: com.app.data.connection.ConnectionManager

at com.app.data.Application.onCreate(Application.java:278)

at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1013)

at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4730)

at android.app.ActivityThread.access$1600(ActivityThread.java:175)

at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1368)

at android.os.Handler.dispatchMessage(Handler.java:102)

at android.os.Looper.loop(Looper.java:146)

at android.app.ActivityThread.main(ActivityThread.java:5602)

at java.lang.reflect.Method.invokeNative(Native Method)

at java.lang.reflect.Method.invoke(Method.java:515)

at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283 )

at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)

at dalvik.system.NativeStart.main(Native Method)

Caused by: java.lang.ClassNotFoundException: com.app.data.connection.ConnectionManager

at java.lang.Class.classForName(Native Method)

at java.lang.Class.forName(Class.java:251)

at java.lang.Class.forName(Class.java:216)

at com.app.data.Application.onCreate(Application.java:276)

at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1013)

at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4730)

at android.app.ActivityThread.access$1600(ActivityThread.java:175)

at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1368)

at android.os.Handler.dispatchMessage(Handler.java:102)

at android.os.Looper.loop(Looper.java:146)

at android.app.ActivityThread.main(ActivityThread.java:5602)

at java.lang.reflect.Method.invokeNative(Native Method)

at java.lang.reflect.Method.invoke(Method.java:515)

at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283 )

at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)

at dalvik.system.NativeStart.main(Native Method)

Caused by: java.lang.NoClassDefFoundError: org.jivesoftware.smackx.ping.PingManager

at com.app.data.connection.ConnectionManager.(ConnectionManager.java:95)

at com.app.data.connection.ConnectionManager.(ConnectionManager.java:64)

at java.lang.Class.classForName(Native Method)

at java.lang.Class.forName(Class.java:251)

at java.lang.Class.forName(Class.java:216)

at com.app.data.Application.onCreate(Application.java:276)

at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1013)

at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4730)

at android.app.ActivityThread.access$1600(ActivityThread.java:175)

at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1368)

at android.os.Handler.dispatchMessage(Handler.java:102)

at android.os.Looper.loop(Looper.java:146)

at android.app.ActivityThread.main(ActivityThread.java:5602)

at java.lang.reflect.Method.invokeNative(Native Method)

at java.lang.reflect.Method.invoke(Method.java:515)

Is there anyone here to help me.

Note : Still yesterday app works very well, from today only I am facing this issue.

I found the root cause.

When I add dependency for gcm as following only I got this issue.

com.google.android.gms:play-services-gcm:8.4.0