idea错误 Error:java: javacTask: source release 1.8 requires target release 1.8 解决

之前碰到过几次这个问题，一直找不到头绪，偶然发现问题是出在iml文件上

<?xml version="1.0" encoding="UTF-8"?>
<module type="JAVA_MODULE" version="4">
<component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_8" inherit-compiler-output="false">
<output url="file://C:/production/java_nio_basic_Test/output" />
<output-test url="file:///test/java_nio_basic_Test" />
<exclude-output />
<content url="file://$MODULE_DIR$">
<sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
<excludeFolder url="file://$MODULE_DIR$/output" />
</content>
<orderEntry type="jdk" jdkName="1.7" jdkType="JavaSDK" />
<orderEntry type="sourceFolder" forTests="false" />
</component>
</module>