KEYCLOAK-3936 Fix keycloak-authz-client JDK7 compatibility

authz/client/pom.xml

@@ -18,6 +18,8 @@
     <description>KeyCloak AuthZ: Client API</description>
 
     <properties>
+        <maven.compiler.source>1.7</maven.compiler.source>
+        <maven.compiler.target>1.7</maven.compiler.target>
         <keycloak.osgi.export>
             org.keycloak.authorization.client.*
         </keycloak.osgi.export>