After reading that this ins't yet supported in JBoss 7, I did some trail and error and got this to work by specifying "cipher-suite" instead of "cipher-suites" as you wrote above or "ciphers" as documented in http://docs.jboss.org/jbossweb/7.0.x/config/ssl.html.

{code:xml}

<subsystem xmlns="urn:jboss:domain:web:1.1" default-virtual-server="default-host" native="false">

    <connector name="http" protocol="HTTP/1.1" scheme="http" socket-binding="http"/>

    <connector name="https" protocol="HTTP/1.1" scheme="https" socket-binding="https" secure="true">

    <ssl name="ssl" password="changeit" certificate-key-file="${jboss.server.config.dir}/wfa.keystore" cipher-suite="TLS_RSA_WITH_AES_256_CBC_SHA,TLS_DHE_RSA_WITH_AES_256_CBC_SHA,TLS_DHE_DSS_WITH_AES_128_CBC_SHA,SSL_RSA_WITH_3DES_EDE_CBC_SHA,SSL_DHE_RSA_WITH_3DES_EDE_CBC_SHA,SSL_DHE_DSS_WITH_3DES_EDE_CBC_SHA" protocol="TLSv1" verify-client="false"/>

    </connector>

    <virtual-server name="default-host" enable-welcome-root="true">

    <alias name="localhost"/>

    </virtual-server>

</subsystem>                                                                                       

{code}

Note that accordig to https://issues.jboss.org/browse/AS7-5501 this isn't yet supported - so I don't really understand how come it is working for me

The reason that it is working for you is because you are configuring JBoss Web which is supported - the Jira issue is in reference to the HTTP server used for management and the admin console in which case specifying the cipers is not not currently supported.