gmail smtp 이용하여 메일 발송

html로 작성한 폼과 gmail smtp 를 이용하여 메일을 발송하려고 합니다.

아래와 같이 에러메세지가 나오면서, 메일이 발송되지 않습니다. ㅠㅠ 

아래와 같은 에러가 발생 시, 어느 부분을 수정하면 좋을까요?

DEBUG: setDebug: JavaMail version 1.4.7

DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Oracle]

DEBUG SMTP: useEhlo true, useAuth true

DEBUG SMTP: useEhlo true, useAuth true

DEBUG SMTP: trying to connect to host "smtp.gmail.com", port 465, isSSL false

javax.mail.MessagingException: Could not connect to SMTP host: smtp.gmail.com, port: 465;

  nested exception is:

javax.net.ssl.SSLHandshakeException: No appropriate protocol (protocol is disabled or cipher suites are inappropriate)

at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1961)

at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:654)

at javax.mail.Service.connect(Service.java:317)

at javax.mail.Service.connect(Service.java:176)

at javax.mail.Service.connect(Service.java:125)

at javax.mail.Transport.send0(Transport.java:194)

at javax.mail.Transport.send(Transport.java:124)

at org.apache.jsp.s_002dmember.email.sendMail_jsp._jspService(sendMail_jsp.java:166)

at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:764)

at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:465)

at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:383)

at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:331)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:764)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:196)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)

at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)

at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:698)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:364)

at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:624)

at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)

at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:831)

at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1650)

at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)

at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)

at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)

at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)

at java.base/java.lang.Thread.run(Thread.java:834)

Caused by: javax.net.ssl.SSLHandshakeException: No appropriate protocol (protocol is disabled or cipher suites are inappropriate)

at java.base/sun.security.ssl.HandshakeContext.<init>(HandshakeContext.java:170)

at java.base/sun.security.ssl.ClientHandshakeContext.<init>(ClientHandshakeContext.java:98)

at java.base/sun.security.ssl.TransportContext.kickstart(TransportContext.java:238)

at java.base/sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:394)

at java.base/sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:373)

at com.sun.mail.util.SocketFetcher.configureSSLSocket(SocketFetcher.java:549)

at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:354)

at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:211)

at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1927)

... 35 more