fix[pb]: missing package definition

protocol/src/main/java/com/zfoo/protocol/serializer/protobuf/GeneratePbUtils.java

@@ -232,7 +232,7 @@ public abstract class GeneratePbUtils {
         var builder = new StringBuilder();
 
         // package definition
-        builder.append(StringUtils.format("package {};", pbGenerateOperation.getJavaPackage())).append(LS).append(LS);
+        builder.append(StringUtils.format("package {}.{};", pbGenerateOperation.getJavaPackage(), proto.getName())).append(LS).append(LS);
 
         // import other class
         var imports = buildMessageImports(pbGenerateOperation, protos, proto, pbMessage);
@@ -259,10 +259,6 @@ public abstract class GeneratePbUtils {
         imports.add(Protocol.class.getName());
 
         var pbFields = pbMessage.getFields();
-        if (CollectionUtils.isEmpty(pbFields)) {
-            return StringUtils.EMPTY;
-        }
-
         for (var pbField : pbFields) {
             if (CollectionUtils.isNotEmpty(pbField.getComments())) {
                 imports.add(Note.class.getName());

protocol/src/main/java/com/zfoo/protocol/serializer/protobuf/parser/Proto.java

@@ -26,6 +26,10 @@ import java.util.List;
  */
 public class Proto {
 
+    /**
+     * 协议的起始Id
+     */
+    private short startProtocolId;
     /**
      * Proto描述文件的名称
      */
@@ -54,10 +58,15 @@ public class Proto {
      * proto文件的单行注释列表
      */
     private List<String> comments = new ArrayList<>();
-    /**
-     * 协议的起始Id
-     */
-    private short startProtocolId;
+
+
+    public short getStartProtocolId() {
+        return startProtocolId;
+    }
+
+    public void setStartProtocolId(short startProtocolId) {
+        this.startProtocolId = startProtocolId;
+    }
 
     public String getName() {
         return name;
@@ -115,11 +124,4 @@ public class Proto {
         this.comments = comments;
     }
 
-    public short getStartProtocolId() {
-        return startProtocolId;
-    }
-
-    public void setStartProtocolId(short startProtocolId) {
-        this.startProtocolId = startProtocolId;
-    }
 }