version empty

core/src/main/java/org/apache/seata/core/serializer/SerializerServiceLoader.java

@@ -24,9 +24,11 @@
 import org.apache.seata.common.loader.EnhancedServiceLoader;
 import org.apache.seata.common.loader.EnhancedServiceNotFoundException;
 import org.apache.seata.common.util.ReflectionUtil;
+import org.apache.seata.common.util.StringUtils;
 import org.apache.seata.config.Configuration;
 import org.apache.seata.config.ConfigurationFactory;
 import org.apache.seata.core.constants.ConfigurationKeys;
+import org.apache.seata.core.protocol.Version;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -72,7 +74,7 @@ public static Serializer load(SerializerType type, String version) throws Enhanc
             throw new EnhancedServiceNotFoundException("The class '" + PROTOBUF_SERIALIZER_CLASS_NAME + "' not found. " +
                     "Please manually reference 'org.apache.seata:seata-serializer-protobuf' dependency.");
         }
-
+        version = StringUtils.isBlank(version) ? Version.getCurrent() : version;
         String key = serializerKey(type, version);
         Serializer serializer = SERIALIZER_MAP.get(key);
         if (serializer == null) {

serializer/seata-serializer-seata/src/main/java/org/apache/seata/serializer/seata/MultiVersionCodec.java

@@ -1,8 +1,27 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     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.seata.serializer.seata;
 
 
 import java.util.Map;
 
+/**
+ * interface MultiVersionCodec
+ */
 public interface MultiVersionCodec {
 
     Map<VersionRange, MessageSeataCodec> oldVersionCodec();

serializer/seata-serializer-seata/src/main/java/org/apache/seata/serializer/seata/MultiVersionCodecHelper.java

@@ -1,3 +1,19 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     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.seata.serializer.seata;
 
 import org.apache.seata.core.protocol.IncompatibleVersionException;