Java package does not exist after library import -

i added jar library project contains package, doesn't recognize that. why error? , how fix it?

screenshot:

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it's not mongo driver. it's javadocs. use mongo driver(direct link) http://central.maven.org/maven2/org/mongodb/mongo-java-driver/3.0.4/mongo-java-driver-3.0.4.jar

p.s. small advice: use maven or gradle better way. , may use repository downloading jars: http://mvnrepository.com/