you need to downgrade your java version. Java 6 worked for me.
Just download the Java 6 SDK and edit the /gephipath/etc/gephi.conf file. You want to have a line similar to this:
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jdkhome="/usr/lib/jvm/java-6-oracle/"
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jdkhome="/usr/lib/jvm/java-6-oracle/"
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jdkhome="/usr/lib/jvm/java-6-oracle/"