The cause of this problem is that the Release Automation agent is pointing to JRE6 installed on the server. To verify this is the case please navigate to path <RA-Agent Install dir>/jre/bin and execute below command(s):
lrwxr-xr-x 1 test test 23 Oct 7 12:05 NolioAgent -> /opt/java6/jre/bin/java
lrwxr-xr-x 1 test test 23 Oct 7 12:05 ext -> /opt/java6/jre/lib/ext
Please contact CA Support in case if you have any question or query.