<!-- If you need to report a security issue please visit https://github.com/apache/dubbo/security/policy -->

- [ ] I have searched the [issues](https://github.com/apache/dubbo/issues) of this repository and believe that this is not a duplicate.

## Ask your question here
![image](https://user-images.githubusercontent.com/15622677/221121735-39571dc2-d771-493a-9d3c-14f8a8ee239f.png)
ReflectionPackableMethod类中 argument.getClass().getName()报空指针
            for (Object argument : arguments) {
                builder.addArgTypes(argument.getClass().getName());
                ByteArrayOutputStream bos = new ByteArrayOutputStream();
                multipleSerialization.serialize(url, serialize, argument.getClass(), argument, bos);
                builder.addArgs(bos.toByteArray());
            }
*
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.dubbo.rpc.protocol.tri;
import org.apache.dubbo.common.URL;
import org.apache.dubbo.common.constants.CommonConstants;
import org.apache.dubbo.common.serialize.MultipleSerialization;
import org.apache.dubbo.common.serialize.support.DefaultSerializationSelector;
import org.apache.dubbo.common.stream.StreamObserver;
import org.apache.dubbo.config.Constants;
import org.apache.dubbo.rpc.model.MethodDescriptor;
import org.apache.dubbo.rpc.model.PackableMethod;
import com.google.protobuf.Message;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.lang.reflect.ParameterizedType;
import java.util.Iterator;
import java.util.stream.Stream;
import static org.apache.dubbo.common.constants.CommonConstants.$ECHO;
import static org.apache.dubbo.common.constants.CommonConstants.PROTOBUF_MESSAGE_CLASS_NAME;
import static org.apache.dubbo.remoting.Constants.SERIALIZATION_KEY;
import static org.apache.dubbo.rpc.protocol.tri.TripleProtocol.METHOD_ATTR_PACK;
public class ReflectionPackableMethod implements PackableMethod {