java - how to run evalb in stanford corNLP? -

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i'm not familiar stanford corenlp. want use 1 of classes evalb. i've imported packages (although many of them have errors). class evalb doesn't have error. when run got exception : 

exception in thread "main" java.lang.exceptionininitializererror @ edu.stanford.nlp.international.language.<clinit>(language.java:15) @ edu.stanford.nlp.parser.metrics.evalb.usage(evalb.java:136) @ edu.stanford.nlp.parser.metrics.evalb.main(evalb.java:163) caused by: java.lang.runtimeexception: uncompilable source code - package        java.util.function not exist @ edu.stanford.nlp.parser.lexparser.abstracttreebankparserparams.<clinit>(abstracttreebankparserparams.java:13) ... 3 more java result: 1

i have installed jdk 1.8

how can fix this?


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