I tried this example:
herongyang.com/JDK/SSL-Socket-Server-Example-SslReverseEchoer.html
herongyang.com/JDK/SSL-Socket-Client-Example-SslSocketClient.html
Then I perform actions similar to these:
herongyang.com/JDK/SSL-Socket-Make-Self-Signed-Certificates-Trusted.html
but I don't know what to do instead of this command:
\jdk\bin\java -cp . "-Djavax.net.ssl.trustStore=public.jks"
SslSocketClient
so I get an exception only:
javax.net.ssl.SSLException: Connection has been shutdown: javax.net.ssl.SSLHandshakeException: Received fatal alert: certificate_unknown
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.checkEOF(Unknown Source)
at com.sun.net.ssl.internal.ssl.AppInputStream.read(Unknown Source)
at sun.nio.cs.StreamDecoder.readBytes(Unknown Source)
at sun.nio.cs.StreamDecoder.implRead(Unknown Source)
at sun.nio.cs.StreamDecoder.read(Unknown Source)
at java.io.InputStreamReader.read(Unknown Source)
at java.io.BufferedReader.fill(Unknown Source)
at java.io.BufferedReader.readLine(Unknown Source)
at java.io.BufferedReader.readLine(Unknown Source)
at Server.main(Server.java:40)
Caused by: javax.net.ssl.SSLHandshakeException: Received fatal alert: certificate_unknown
at com.sun.net.ssl.internal.ssl.Alerts.getSSLException(Unknown Source)
at com.sun.net.ssl.internal.ssl.Alerts.getSSLException(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.recvAlert(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.performInitialHandshake(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.startHandshake(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.getSession(Unknown Source)
at Server.printSocketInfo(Server.java:68)
at Server.main(Server.java:35)
] 
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