Installing/Using SOAPUI for Linux

Hello Eviware Forum,
I am a new SOAPUI user. A coworker showed me this SOAPUI tool for Windows and it looks very helpful. I am trying to install this same tool for Redhat Linux.

I have downloaded the binary, made sure that JRE is in my path and now I am trying to launch the tool. I enter this command:

./soapui-3.6.1

then I see this:

=============
=
= SOAPUI_HOME = /opt/soap/soapui-3.6.1
=
=============

after a short while I see a bunch of errors:


Exception in thread "main" java.lang.NoClassDefFoundError: com.eviware.soapui.SoapUI
at java.lang.Class.initializeClass(libgcj.so7rh)
Caused by: java.lang.ClassNotFoundException: java.util.concurrent.ThreadFactory not found
in gnu.gcj.runtime.SystemClassLoader{urls=[file:/opt/soapui/soapui-3.6.1/bin/soapui-3.6.1.jar,...

there are more errors but I am hoping this is enough for someone to give me a clue to the problem.

Any help that can be provided would be great. Thank you.