public com.google.protobuf.ByteString getMainClassBytes() {
    java.lang.Object ref = "";
    if (driverCase_ == 2) {
      ref = driver_;
    }
    if (ref instanceof java.lang.String) {
      com.google.protobuf.ByteString b =
          com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
      if (driverCase_ == 2) {
        driver_ = b;
      }
      return b;
    } else {
      return (com.google.protobuf.ByteString) ref;
    }
  }
public com . google . protobuf . ByteString getMainClassBytes ( ) { java . lang . Object ref = "" ; if ( driverCase_ == 2 ) { ref = driver_ ; } if ( ref instanceof java . lang . String ) { com . google . protobuf . ByteString b = com . google . protobuf . ByteString . copyFromUtf8 ( ( java . lang . String ) ref ) ; if ( driverCase_ == 2 ) { driver_ = b ; } return b ; } else { return ( com . google . protobuf . ByteString ) ref ; } }
<pre>
The name of the driver's main class. The jar file containing the class
must be in the default CLASSPATH or specified in `jar_file_uris`.
</pre>

<code>string main_class = 2;</code>