netty 私有协议栈开发的坑

package com.netty.protocol;

import io.netty.handler.codec.marshalling.DefaultMarshallerProvider; import io.netty.handler.codec.marshalling.DefaultUnmarshallerProvider; import io.netty.handler.codec.marshalling.MarshallerProvider; import io.netty.handler.codec.marshalling.UnmarshallerProvider; import org.jboss.marshalling.MarshallerFactory; import org.jboss.marshalling.Marshalling; import org.jboss.marshalling.MarshallingConfiguration;

public class MarshallingCodeCFactory { public static NettyMarshallingDecoder buildMarshallingDecoder(){ final MarshallerFactory marshallerFactory = Marshalling.getProvidedMarshallerFactory("serial"); final MarshallingConfiguration configuration = new MarshallingConfiguration(); configuration.setVersion(5); UnmarshallerProvider provider = new DefaultUnmarshallerProvider(marshallerFactory, configuration); int maxSize = 1024 << 2; NettyMarshallingDecoder decoder = new NettyMarshallingDecoder(provider, maxSize); return decoder; }

public static NettyMarshallingEncoder buildMarshallingEncoder(){
	final MarshallerFactory marshallerFactory = Marshalling.getProvidedMarshallerFactory("serial");
	final MarshallingConfiguration configuration = new MarshallingConfiguration();
	configuration.setVersion(5);
	MarshallerProvider provider = new DefaultMarshallerProvider(marshallerFactory, configuration);
	NettyMarshallingEncoder encoder = new NettyMarshallingEncoder(provider);
	return encoder;
}

}

marshallerFactory 获取到为 null，是什么情况？用下边构造 encoder decoder 直接就报错了，各位大神有懂的吗？