Right after I installed Java 8 and then tried to launch the designer or projects using Java Web Start the application would freeze right after logging in. This occurred on Ignition 7.6 and Ignition 7.7.
Maybe it had to do with Java 8 using settings that were used for Java 7 or missing properties or settings for Java 8? That is just a guess.
I am using Ubuntu Linux. My Java Console freezed too. I was able to take the attached screenshot after my Java Console freezed.
I was able to get around this problem by using the client launcher to launch the designer and projects.