Why Firefox throws an error when trying to verify installed Java?

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Issue

The RHEL7.0 origin IcedTea plugin (1.4) the browser firefox seems to freeze
top command show a java process at nearly 100%
With RHEL7.0 updated IcedTea plugin (1.6) the browser show the IcedTea logo and then a big red ERROR.
Memory utilization of java process is too high.

Environment

Red Hat Enterprise Linux 7
Firefox
IcedTea plugin 1.4

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