java - Getting error in eclipse when pressing f3 after importing Spring Source -


when pressing f3 or menu open declaration in eclipse luna following:

problems opening editor. org.eclipse.jdt.internal.core.sourcetype cannot cast java.lang.string

i'm using latest luna release version: luna release build id: 20131003-0825 , i've followed spring source guide import projects. using latest jdk 8

any ideas?


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