At that time, I asked the next great God, they asked me if I was jdk problem. Because jdk8 only support such a prism wording. At that time his jdk version is jdk8, then wonder, finally, I found out that tune into 5.0 Language level of
5.0 does not support code 6.0 / 7.0 features, so I set it to 7, problem solved.
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