@VisibleForTesting
  public ByteBufferVendor getInputBufferVendorForTestingOnly() {
    return inputBufferVendor;
  }
This will throw an SSLHandshakeException if the handshake doesn't terminate in a FINISHED
state. It may throw other IOExceptions caused by I/O operations
geode-core/src/main/java/org/apache/geode/internal/net/NioSslEngine.java