java.lang.UnsupportedClassVersionError: br/com/br/sendMail/sendMail/EmailService : Unsupported major.minor version 52.0

Pessoal, não estou conseguindo enviar email devido a esse erro. Poderiam me ajudar? Troquei a vesão no Java Compiler para 1.7, mas não resolveu.

Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.

Sat Sep 01 23:00:43 BRT 2018
There was an unexpected error (type=Internal Server Error, status=500).
br/com/br/sendMail/sendMail/EmailService : Unsupported major.minor version 52.0

java.lang.UnsupportedClassVersionError: br/com/br/sendMail/sendMail/EmailService : Unsupported major.minor version 52.0
    at java.lang.ClassLoader.defineClass1(Native Method) ~[na:1.7.0_80]
    at java.lang.ClassLoader.defineClass(Unknown Source) ~[na:1.7.0_80]
    at java.security.SecureClassLoader.defineClass(Unknown Source) ~[na:1.7.0_80]
    at java.net.URLClassLoader.defineClass(Unknown Source) ~[na:1.7.0_80]
    at java.net.URLClassLoader.access$100(Unknown Source) ~[na:1.7.0_80]
    at java.net.URLClassLoader$1.run(Unknown Source) ~[na:1.7.0_80]
    at java.net.URLClassLoader$1.run(Unknown Source) ~[na:1.7.0_80]
    at java.security.AccessController.doPrivileged(Native Method) ~[na:1.7.0_80]
    at java.net.URLClassLoader.findClass(Unknown Source) ~[na:1.7.0_80]
    at org.springframework.boot.devtools.restart.classloader.RestartClassLoader.findClass(RestartClassLoader.java:165) ~[spring-boot-devtools-1.4.2.RELEASE.jar:1.4.2.RELEASE]
    at org.springframework.boot.devtools.restart.classloader.RestartClassLoader.loadClass(RestartClassLoader.java:148) ~[spring-boot-devtools-1.4.2.RELEASE.jar:1.4.2.RELEASE]
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.7.0_80]
    at br.com.alura.listavippro.ConvidadoController.salvar(ConvidadoController.java:49) ~[classes/:na]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.7.0_80]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.7.0_80]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.7.0_80]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.7.0_80]
    at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221) ~[spring-web-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136) ~[spring-web-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:114) ~[spring-webmvc-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827) ~[spring-webmvc-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738) ~[spring-webmvc-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) ~[spring-webmvc-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963) ~[spring-webmvc-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897) ~[spring-webmvc-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) ~[spring-webmvc-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872) ~[spring-webmvc-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:648) ~[tomcat-embed-core-8.5.4.jar:8.5.4]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) ~[tomcat-embed-core-8.5.4.jar:8.5.4]
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) ~[tomcat-embed-websocket-8.5.4.jar:8.5.4]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) ~[tomcat-embed-core-8.5.4.jar:8.5.4]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) ~[tomcat-embed-core-8.5.4.jar:8.5.4]
    at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) ~[spring-web-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) ~[tomcat-embed-core-8.5.4.jar:8.5.4]
    at org.apache.catalina.core.ApplicationFilterChain.doFil