Daniel Bevenius thanks for the hint.

However, RHEL 6.4 does not enable NSS support, see https://bugzilla.redhat.com/show_bug.cgi?id=966458 and https://bugzilla.redhat.com/show_bug.cgi?id=831734.
I configured it to use NSS for both OpenJDK and Oracle JDK, but still it won't behave the same. Now the tests are failing with:

Oracle JDK:

java.lang.NoClassDefFoundError: Could not initialize class javax.crypto.JceSecurity                                                                                                                                                        
        at javax.crypto.Cipher.getInstance(Cipher.java:499)                                                                                                                                                                                    
        at org.jboss.aerogear.simplepush.util.CryptoUtil.encrypt(CryptoUtil.java:50)

OpenJDK

java.security.NoSuchAlgorithmException: SHA1PRNG SecureRandom not available
        at sun.security.jca.GetInstance.getInstance(GetInstance.java:159)
        at java.security.SecureRandom.getInstance(SecureRandom.java:276)
        at org.jboss.aerogear.simplepush.util.CryptoUtil.key(CryptoUtil.java:75)

I'll investigate it further and let you know.

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