【Android开发遇错】Android studio 添加jar后编译报错Error converting bytecode to dex: Cause: Dex cannot pars_android stuido error:error converting bytecode to

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添加了一个mysql-connector-java-5.1.38-bin.jar然后编译就报错了

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错误信息如下：
Error:Error converting bytecode to dex:
Cause: Dex cannot parse version 52 byte code.
This is caused by library dependencies that have been compiled using Java 8 or above.
If you are using the ‘java’ gradle plugin in a library submodule add
targetCompatibility = ‘1.7’
sourceCompatibility = ‘1.7’
to that submodule’s build.gradle file.
Error:1 error; aborting
:app:transformClassesWithDexForDebug FAILED
Error:Execution failed for task ‘:app:transformClassesWithDexForDebug’.

com.android.build.api.transform.TransformException: java.lang.RuntimeException: 
com.android.ide.common.process.ProcessException: java.util.concurrent.ExecutionException: 
com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 
'command 'C:\Program Files\Java\jdk1.8.0_66\bin\java.exe'' finished with non-zero exit value 1
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原因：
出现这个现象的原因是你的jar包是基于jdk 1.8的，但当前AS（2.3.1）默认使用的jdk是1.7的。添加如下两句话，使你的项目适配JDK1.8。

解决：