use maven CI friendly versions: revision, cherry-pick to 3.x.

.mvn/wrapper/maven-wrapper.properties

@@ -1 +1 @@
-distributionUrl=https://repo1.maven.org/maven2/org/apache/maven/apache-maven/3.5.0/apache-maven-3.5.0-bin.zip
+distributionUrl=https://repo1.maven.org/maven2/org/apache/maven/apache-maven/3.6.0/apache-maven-3.6.0-bin.zip

codestyle/checkstyle.xml

@@ -9,7 +9,7 @@
 
     <!-- TreeWalker Checks -->
     <module name="TreeWalker">
-        <module name="SuppressWarningsHolder" />
+        <module name="SuppressWarningsHolder"/>
 
         <module name="AvoidStarImport"/>
         <module name="AvoidEscapedUnicodeCharacters">

dubbo-all/pom.xml

@@ -19,11 +19,10 @@
     <parent>
         <groupId>org.apache.dubbo</groupId>
         <artifactId>dubbo-parent</artifactId>
-        <version>2.7.1-SNAPSHOT</version>
+        <version>${revision}</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
     <artifactId>dubbo</artifactId>
-    <version>2.7.1-SNAPSHOT</version>
     <packaging>jar</packaging>
     <name>dubbo-all</name>
     <description>The all in one project of dubbo</description>
@@ -143,6 +142,13 @@
             <scope>compile</scope>
             <optional>true</optional>
         </dependency>
+        <dependency>
+            <groupId>org.apache.dubbo</groupId>
+            <artifactId>dubbo-rpc-jsonrpc</artifactId>
+            <version>${project.version}</version>
+            <scope>compile</scope>
+            <optional>true</optional>
+        </dependency>
         <dependency>
             <groupId>org.apache.dubbo</groupId>
             <artifactId>dubbo-rpc-rmi</artifactId>
@@ -332,6 +338,13 @@
             <scope>compile</scope>
             <optional>true</optional>
         </dependency>
+        <dependency>
+            <groupId>org.apache.dubbo</groupId>
+            <artifactId>dubbo-serialization-avro</artifactId>
+            <version>${project.version}</version>
+            <scope>compile</scope>
+            <optional>true</optional>
+        </dependency>
         <dependency>
             <groupId>org.apache.dubbo</groupId>
             <artifactId>dubbo-serialization-protostuff</artifactId>
@@ -491,6 +504,7 @@
                                     <include>org.apache.dubbo:dubbo-rpc-api</include>
                                     <include>org.apache.dubbo:dubbo-rpc-dubbo</include>
                                     <include>org.apache.dubbo:dubbo-rpc-injvm</include>
+                                    <include>org.apache.dubbo:dubbo-rpc-jsonrpc</include>
                                     <include>org.apache.dubbo:dubbo-rpc-rmi</include>
                                     <include>org.apache.dubbo:dubbo-rpc-hessian</include>
                                     <include>org.apache.dubbo:dubbo-rpc-http</include>
@@ -523,6 +537,7 @@
                                     <include>org.apache.dubbo:dubbo-serialization-hessian2</include>
                                     <include>org.apache.dubbo:dubbo-serialization-fst</include>
                                     <include>org.apache.dubbo:dubbo-serialization-kryo</include>
+                                    <include>org.apache.dubbo:dubbo-serialization-avro</include>
                                     <include>org.apache.dubbo:dubbo-serialization-jdk</include>
                                     <include>org.apache.dubbo:dubbo-serialization-protostuff</include>
                                     <include>org.apache.dubbo:dubbo-configcenter-api</include>

dubbo-bom/pom.xml

@@ -1,17 +1,32 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!--
+  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.
+  -->
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 
     <modelVersion>4.0.0</modelVersion>
 
     <parent>
         <groupId>org.apache.dubbo</groupId>
         <artifactId>dubbo-parent</artifactId>
-        <version>2.7.1-SNAPSHOT</version>
+        <version>${revision}</version>
     </parent>
 
     <groupId>org.apache.dubbo</groupId>
     <artifactId>dubbo-bom</artifactId>
-    <version>2.7.1-SNAPSHOT</version>
     <packaging>pom</packaging>
 
     <name>dubbo-bom</name>
@@ -158,6 +173,11 @@
                 <artifactId>dubbo-rpc-injvm</artifactId>
                 <version>${project.version}</version>
             </dependency>
+            <dependency>
+                <groupId>org.apache.dubbo</groupId>
+                <artifactId>dubbo-rpc-jsonrpc</artifactId>
+                <version>${project.version}</version>
+            </dependency>
             <dependency>
                 <groupId>org.apache.dubbo</groupId>
                 <artifactId>dubbo-rpc-rmi</artifactId>
@@ -303,6 +323,11 @@
                 <artifactId>dubbo-serialization-protostuff</artifactId>
                 <version>${project.version}</version>
             </dependency>
+            <dependency>
+                <groupId>org.apache.dubbo</groupId>
+                <artifactId>dubbo-serialization-avro</artifactId>
+                <version>${project.version}</version>
+            </dependency>
             <dependency>
                 <groupId>org.apache.dubbo</groupId>
                 <artifactId>dubbo-compatible</artifactId>

dubbo-cluster/pom.xml

@@ -19,7 +19,7 @@
     <parent>
         <groupId>org.apache.dubbo</groupId>
         <artifactId>dubbo-parent</artifactId>
-        <version>2.7.1-SNAPSHOT</version>
+        <version>${revision}</version>
     </parent>
     <artifactId>dubbo-cluster</artifactId>
     <packaging>jar</packaging>

dubbo-common/pom.xml

@@ -20,7 +20,7 @@
     <parent>
         <groupId>org.apache.dubbo</groupId>
         <artifactId>dubbo-parent</artifactId>
-        <version>2.7.1-SNAPSHOT</version>
+        <version>${revision}</version>
     </parent>
     <artifactId>dubbo-common</artifactId>
     <packaging>jar</packaging>

dubbo-compatible/pom.xml

@@ -20,7 +20,7 @@
     <parent>
         <groupId>org.apache.dubbo</groupId>
         <artifactId>dubbo-parent</artifactId>
-        <version>2.7.1-SNAPSHOT</version>
+        <version>${revision}</version>
     </parent>
     <artifactId>dubbo-compatible</artifactId>
     <packaging>jar</packaging>

dubbo-config/dubbo-config-api/pom.xml

@@ -19,7 +19,7 @@
     <parent>
         <groupId>org.apache.dubbo</groupId>
         <artifactId>dubbo-config</artifactId>
-        <version>2.7.1-SNAPSHOT</version>
+        <version>${revision}</version>
     </parent>
     <artifactId>dubbo-config-api</artifactId>
     <packaging>jar</packaging>