Installing Installation manager on RedHat 6.6 JVMJ9VM035 Unable to allocate OutOfMemoryError

Hello,

       I'm trying to install "Installation Manager 1.8" on Redhat 6.6 64bits in order to install  RTC 5.0.2 and so on.

      When trying to install Installation Manager    (./consoleinst.sh) ,  I have the message :

         JVMJ9VM035 Unable to allocate OutOfMemoryError
JVMDUMP039I Processing dump event "abort", detail "" at 2015/03/03 10:38:27 - please wait.
JVMDUMP032I JVM requested System dump using '/tmp/core.20150303.103827.24410.0001.dmp' in response to an event

      Any help would be greatly appreciated.

             Thanks