Mockserver + Jersey SSL Config

exception

io.netty.handler.codec.DecoderException: javax.net.ssl.SSLException: Received fatal alert: certificate_unknown
	at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:358) ~[mockserver-netty-3.9.16-jar-with-dependencies.jar:na]
	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:230) ~[mockserver-netty-3.9.16-jar-with-dependencies.jar:na]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308) [mockserver-netty-3.9.16-jar-with-dependencies.jar:na]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294) [mockserver-netty-3.9.16-jar-with-dependencies.jar:na]
	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:846) [mockserver-netty-3.9.16-jar-with-dependencies.jar:na]
	at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:131) [mockserver-netty-3.9.16-jar-with-dependencies.jar:na]
	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511) [mockserver-netty-3.9.16-jar-with-dependencies.jar:na]
	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468) [mockserver-netty-3.9.16-jar-with-dependencies.jar:na]
	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382) [mockserver-netty-3.9.16-jar-with-dependencies.jar:na]
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354) [mockserver-netty-3.9.16-jar-with-dependencies.jar:na]
	at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111) [mockserver-netty-3.9.16-jar-with-dependencies.jar:na]
	at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:137) [mockserver-netty-3.9.16-jar-with-dependencies.jar:na]
	at java.lang.Thread.run(Thread.java:745) [na:1.8.0_60-ea]
Caused by: javax.net.ssl.SSLException: Received fatal alert: certificate_unknown
	at sun.security.ssl.Alerts.getSSLException(Alerts.java:208) ~[na:1.8.0_60-ea]
	at sun.security.ssl.SSLEngineImpl.fatal(SSLEngineImpl.java:1666) ~[na:1.8.0_60-ea]
	at sun.security.ssl.SSLEngineImpl.fatal(SSLEngineImpl.java:1634) ~[na:1.8.0_60-ea]
	at sun.security.ssl.SSLEngineImpl.recvAlert(SSLEngineImpl.java:1800) ~[na:1.8.0_60-ea]
	at sun.security.ssl.SSLEngineImpl.readRecord(SSLEngineImpl.java:1083) ~[na:1.8.0_60-ea]
	at sun.security.ssl.SSLEngineImpl.readNetRecord(SSLEngineImpl.java:907) ~[na:1.8.0_60-ea]
	at sun.security.ssl.SSLEngineImpl.unwrap(SSLEngineImpl.java:781) ~[na:1.8.0_60-ea]
	at javax.net.ssl.SSLEngine.unwrap(SSLEngine.java:624) ~[na:1.8.0_60-ea]
	at io.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:1140) ~[mockserver-netty-3.9.16-jar-with-dependencies.jar:na]
	at io.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:1004) ~[mockserver-netty-3.9.16-jar-with-dependencies.jar:na]
	at io.netty.handler.ssl.SslHandler.decode(SslHandler.java:944) ~[mockserver-netty-3.9.16-jar-with-dependencies.jar:na]
	at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:327) ~[mockserver-netty-3.9.16-jar-with-dependencies.jar:na]
	... 12 common frames omitted

Main.java

public class Main()
{
    public Client getHttpsClient() throws KeyStoreException
    {
        return ClientBuilder.newBuilder()
                .sslContext(getSSLContextProvider().getSSLContext())
                .build();
    }
    
    @VisibleForTesting
    public SSLContextProvider getSSLContextProvider()
    {
        return new DefaultSSLContextProvider();
    }
}

MainTest.java

when(main.getSSLContextProvider()).thenReturn(new MockServerSSLContextProvider());

// later we use the jersey client but get an exception

MockServerSSLContextProvider

package net.cryptodirect.cryptodash.crypto;

import java.security.KeyStore;
import java.security.KeyStoreException;

import javax.net.ssl.SSLContext;

import org.mockserver.socket.SSLFactory;

/**
 * @author Michael Ennen
 */
public class MockServerSSLContextProvider implements SSLContextProvider
{
    @Override
    public SSLContext getSSLContext() throws KeyStoreException
    {
        return SSLFactory.getInstance().sslContext();
    }

    @Override
    public KeyStore getKeyStore() throws KeyStoreException
    {
        return SSLFactory.getInstance().buildKeyStore();
    }
}