I use NotificationBus channel and in the member joined method I call, bus.sendNotification(Node) - passing a custom Node object. Upon this I get the following error on the newly joined member,

javax.crypto.IllegalBlockSizeException: Input length must be multiple of 8 when decrypting with padded cipher
at com.sun.crypto.provider.SunJCE_f.b(DashoA13*..)
at com.sun.crypto.provider.SunJCE_f.b(DashoA13*..)
at com.sun.crypto.provider.DESCipher.engineDoFinal(DashoA13*..)
at javax.crypto.Cipher.doFinal(DashoA13*..)
at org.jgroups.protocols.ENCRYPT._decrypt(ENCRYPT.java:838)
at org.jgroups.protocols.ENCRYPT.decryptMessage(ENCRYPT.java:831)
at org.jgroups.protocols.ENCRYPT.handleUpMessage(ENCRYPT.java:672)
at org.jgroups.protocols.ENCRYPT.up(ENCRYPT.java:533)

I could reproduce the same problem using NotificationBusDemo.java in JGroups 2.5 CR1. Here is what I did,

1) Generate a keystore using JGroups' KeyStoreGenerator (I also tried with JDK 1.6's keytool to generate secret key)
2) Add the following line in the protocol stack of NotificationBusDemo.java in the main(),
"ENCRYPT(key_store_name=jgroups.keystore;store_password=storePassed;alias=mykey):" +

3) Add the following line in the memberJoined(..) method of NotificationBusDemo.java
bus.sendNotification("Member Joined");

4) Run 2 instances of NotificationBusDemo.java
5) You'll get the following error message,

> 3828 [WARN] ENCRYPT.up(): - exception occurred decrypting message
javax.crypto.BadPaddingException: Given final block not properly padded
at com.sun.crypto.provider.SunJCE_h.b(DashoA12275)
at com.sun.crypto.provider.SunJCE_h.b(DashoA12275)

I am running this on Windows using JGroups 2.5 CR1. The original thread for this issue is at,

http://sourceforge.net/forum/forum.php?thread_id=1751571&forum_id=18795