java.lang.UnsupportedClassVersionError: com/google/common/util/concurrent/ThreadFactoryBuilder : Uns

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报错信息java.lang.UnsupportedClassVersionError: com/google/common/util/concurrent/ThreadFactoryBuilder : Unsupported major.minor version 52.0

jdk1.7 使用guava 20.0

<dependency>
	    <groupId>com.google.guava</groupId>
	    <artifactId>guava</artifactId>
	    <version>20.0</version>
	</dependency>