javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?

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Unrecognized SSL message, plaintext connection?
javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?
at com.sun.net.ssl.internal.ssl.InputRecord.handleUnknownRecord(InputRecord.java:523)
at com.sun.net.ssl.internal.ssl.InputRecord.read(InputRecord.java:355)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:798)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1138)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readDataRecord(SSLSocketImpl.java:753)
at com.sun.mail.util.TraceInputStream.read(TraceInputStream.java:97)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
at java.io.BufferedInputStream.read(BufferedInputStream.java:237)
at com.sun.mail.util.LineInputStream.readLine(LineInputStream.java:75)
at com.sun.mail.smtp.SMTPTransport.readServerResponse(SMTPTransport.java:1440)
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1260)
at javax.mail.Service.connect(Service.java:275)
at javax.mail.Service.connect(Service.java:156)
at com.aimluck.eip.mail.ALSmtpMailSender.send(ALSmtpMailSender.java:363)
at com.aimluck.eip.mail.ALMailHandler.send(ALMailHandler.java:114)
at com.aimluck.eip.webmail.WebMailFormData.insertFormData(WebMailFormData.java:371)
at com.aimluck.eip.common.ALAbstractFormData.doInsert(ALAbstractFormData.java:205)
at com.aimluck.eip.modules.screens.WebMailFormJSONScreen.getJSONString(WebMailFormJSONScreen.java:56)
at com.aimluck.eip.modules.screens.ALJSONScreen.doOutput(ALJSONScreen.java:94)
at org.apache.turbine.modules.screens.RawScreen.doBuild(RawScreen.java:95)
at org.apache.turbine.modules.Screen.build(Screen.java:99)
at org.apache.turbine.modules.ScreenLoader.eval(ScreenLoader.java:129)
at org.apache.turbine.modules.ScreenLoader.exec(ScreenLoader.java:144)
at org.apache.turbine.modules.pages.DefaultPage.doBuild(DefaultPage.java:173)
at org.apache.turbine.modules.Page.build(Page.java:90)
at org.apache.turbine.modules.PageLoader.exec(PageLoader.java:123)
at org.apache.turbine.Turbine.doGet(Turbine.java:563)
at org.apache.turbine.Turbine.doPost(Turbine.java:658)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at com.aimluck.eip.filter.ALBaseFilter.doFilter(ALBaseFilter.java:90)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at java.lang.Thread.run(Thread.java:662)

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