Android studio 添加jar后编译报错

Question

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

Answer 1

从报错的英文上看，应该是项目是基于java1.8或者以上的，但是导的jar包是基于1.7的，所以会报错。可以修改项目的java版本到1.7再试一下。

targetCompatibility = '1.7'
sourceCompatibility = '1.7'