here are a couple of things to consider:
do you have a valid jdk installed? you can check
c:\program files(x86)\java\for a jdk folder.
in eclipse, right click the java project, >
configure build path...this should open up a
java build pathwindow.
in here, click the
librariestab. if there are now
jre system libraryentries, click
jre system library>
nextand you can either pick
workspace default jrewhich should be something like
jre1.8.0_25or, you can select
execution environment. if you select the latter, click the
environments...button, and select the
javase-*version that you would like.
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