add new common module

common/.gitignore

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+HELP.md
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/

common/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <artifactId>ProjectOctopus</artifactId>
+        <groupId>io.wdd</groupId>
+        <version>0.0.1-SNAPSHOT</version>
+    </parent>
+
+    <groupId>io.wdd</groupId>
+    <artifactId>common</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+
+    <name>common</name>
+    <description>common</description>
+
+    <properties>
+        <java.version>11</java.version>
+    </properties>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>

common/src/main/java/io/wdd/common/CommonApplication.java

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+package io.wdd.common;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class CommonApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(CommonApplication.class, args);
+    }
+
+}

common/src/main/resources/application.properties

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+