reverse jdk to 1.7

pom.xml

@@ -96,8 +96,8 @@
         <maven.test.skip>true</maven.test.skip>
         <downloadSources>true</downloadSources>
         <!-- compiler settings properties -->
-        <java_source_version>1.8</java_source_version>
-        <java_target_version>1.8</java_target_version>
+        <java_source_version>1.7</java_source_version>
+        <java_target_version>1.7</java_target_version>
         <file_encoding>UTF-8</file_encoding>
         <spring_version>3.2.18.RELEASE</spring_version>
         <maven-jacoco-plugin.version>0.8.3</maven-jacoco-plugin.version>