If you may get an error while starting Jboss 7 service  ignoring option MaxPermSize=256m; support was removed in 8.0

# /etc/init.d/jboss start
Starting jboss-as: Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=256m; support was removed in 8.0

                                                           [  OK  ]

I did recommend you can download and install JDK 7 version, the below steps will help you,

Solution:

Remove JDK latest version:
 
# rpm -qa | grep jdk
jdk1.8.0_25-1.8.0_25-fcs.x86_64

 
# rpm -e jdk1.8.0_25-1.8.0_25-fcs.x86_64

Download and install jdk support version,
 
# wget http://url/jdk-7u60-linux-x64.rpm

# rpm -i jdk-7u60-linux-x64.rpm


warning: /etc/init.d/jexec saved as /etc/init.d/jexec.rpmorig

Unpacking JAR files...

    rt.jar...

    jsse.jar...

    charsets.jar...

    tools.jar...

    localedata.jar...

    jfxrt.jar...

Finally, start the Jboss service.