Based on 3c27f082567da73bc4dfbf7d7c4337e183dda0b5

RHEL 6.4, without NSS:

Oracle JDK 7

Java home: /usr/lib/jvm/java-1.7.0-oracle.x86_64
Java 5 home: /opt/jdk1.5.0_19
[kpiwko@kapy-ntb-x220 aerogear-simplepush-server]$ java -version
java version "1.7.0_25"
Java(TM) SE Runtime Environment (build 1.7.0_25-b15)
Java HotSpot(TM) 64-Bit Server VM (build 23.25-b01, mixed mode)

OpenJDK 7

java version "1.7.0_25"
OpenJDK Runtime Environment (rhel-2.3.10.4.el6_4-x86_64)
OpenJDK 64-Bit Server VM (build 23.7-b01, mixed mode)

IBM JDK 7

java version "1.7.0"
Java(TM) SE Runtime Environment (build pxa6470sr5-20130619_01(SR5))
IBM J9 VM (build 2.6, JRE 1.7.0 Linux amd64-64 Compressed References 20130617_152572 (JIT enabled, AOT enabled)
J9VM - R26_Java726_SR5_20130617_1436_B152572
JIT  - r11.b04_20130528_38954ifx1
GC   - R26_Java726_SR5_20130617_1436_B152572_CMPRSS
J9CL - 20130617_152572)
JCL - 20130616_01 based on Oracle 7u25-b12

JDK 6

java version "1.6.0_45"
Java(TM) SE Runtime Environment (build 1.6.0_45-b06)
Java HotSpot(TM) 64-Bit Server VM (build 20.45-b01, mixed mode)

Failed to compile

[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] /home/kpiwko/devel/mobile/upstream/aerogear-simplepush-server/netty-codec-sockjs/src/test/java/org/jboss/aerogear/io/netty/handler/codec/sockjs/protocol/StubEmbeddedEventLoop.java:[121,23] reference to next is ambiguous, both method next() in io.netty.channel.EventLoopGroup and method next() in io.netty.util.concurrent.EventExecutor match
[INFO] 1 error

OpenJDK 6

Failed to compile

[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] /home/kpiwko/devel/mobile/upstream/aerogear-simplepush-server/netty-codec-sockjs/src/test/java/org/jboss/aerogear/io/netty/handler/codec/sockjs/protocol/StubEmbeddedEventLoop.java:[121,23] reference to next is ambiguous, both method next() in io.netty.channel.EventLoopGroup and method next() in io.netty.util.concurrent.EventExecutor match

java version "1.6.0_24"
OpenJDK Runtime Environment (IcedTea6 1.11.11.90) (rhel-1.62.1.11.11.90.el6_4-x86_64)
OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode)

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