Why will Tomcat not accept EC cipher suites?

[John.E.Gregg]

All,

I'm using Tomcat 7.0.82 and java 1.8.0_152.

I cannot get Tomcat to accept elliptic curve ciphers.  I've written a small SSL 
socket server that uses the same certificate as the server and deployed it on 
the same machine using the same JDK.  It accepts EC ciphers just fine so I 
don't think there is anything in the JDK that has disabled them, etc.  With 
verbose SSL enabled, Tomcat, however, complains about "http-bio-7114-exec-4, 
handling exception: javax.net.ssl.SSLHandshakeException: no cipher suites in 
common."

If I omit the "ciphers" property of the connector, I get this:

No available cipher suite for TLSv1
No available cipher suite for TLSv1.1
No available cipher suite for TLSv1.2

If I set ciphers="ALL,"  I'm back to "no cipher suites in common."

If I explicitly tell Tomcat to accept TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256, 
which works with my socket server, I get "No appropriate protocol (protocol is 
disabled or cipher suites are inappropriate)."

BTW I have an RSA cert on the server with a 2048-bit key and signed using 
SHA256withRSA.

One of the connector configs I've tried.

    <Connector port="7114"
        protocol="HTTP/1.1"
        SSLEnabled="true"
        maxThreads="400"
        maxKeepAliveRequests="100"
        keepAliveTimeout="10000"
        scheme="https"
        secure="true"
        clientAuth="true"
        sessionCacheSize="5"
        sslProtocol="TLS"
        keystoreFile="/path/to/keystore"
        keystorePass="${keystore.password}"
        keyAlias="test"
        truststoreFile="/path/to/cacerts"
        truststorePass="${truststore.password}"
        allowUnsafeLegacyRenegotiation="false"
        />

Thanks

John