integrate checkstyle

.asf.yaml

@@ -45,9 +45,9 @@ github:
         dismiss_stale_reviews: true
         required_approving_review_count: 1
 notifications:
-    commits:      commits@eventmesh.apache.org
+    commits: commits@eventmesh.apache.org
     # Send all issue emails (new, closed, comments) to issues@
-    issues:       issues@eventmesh.apache.org
+    issues: issues@eventmesh.apache.org
     # Send new/closed PR notifications to dev@
     pullrequests_status: dev@eventmesh.apache.org
     # Send individual PR comments/reviews to issues@

README.md

@@ -18,7 +18,7 @@
 
 1. eventmesh-dashboard-console  业务模块的代码，调用service接口
 2. eventmesh-dashboard-observe  监控模块的代码
-3. eventmesh-dashboard-core     对eventmesh以及相关组件的代码，提供service实现
+3. eventmesh-dashboard-core     对EventMesh Runtime, Meta以及相关组件的代码，提供service实现
 4. eventmesh-dashboard-service  公用API接口，对core的抽象
 5. eventmesh-dashboard-common   公共模块的代码
 6. eventmesh-dashboard-view     前端代码

eventmesh-dashboard-common/src/main/java/org/apache/eventmesh/dashboard/common/Main.java

@@ -1,7 +1,23 @@
+/*
+ * 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.eventmesh.dashboard.common;
 
 public class Main {
     public static void main(String[] args) {
-        System.out.println("Hello world!");
     }
 }

eventmesh-dashboard-observe/src/main/java/org/apache/eventmesh/dashboard/observe/Main.java

@@ -1,7 +1,23 @@
+/*
+ * 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.eventmesh.dashboard.observe;
 
 public class Main {
     public static void main(String[] args) {
-        System.out.println("Hello world!");
     }
 }

eventmesh-dashboard-service/src/main/java/org/apache/eventmesh/dashboard/service/Main.java

@@ -1,7 +1,23 @@
+/*
+ * 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.eventmesh.dashboard.service;
 
 public class Main {
     public static void main(String[] args) {
-        System.out.println("Hello world!");
     }
 }

pom.xml

@@ -89,6 +89,7 @@
     <module>eventmesh-dashboard-service</module>
     <module>eventmesh-dashboard-common</module>
   </modules>
+
   <dependencyManagement>
     <dependencies>
       <dependency>
@@ -105,4 +106,30 @@
       </dependency>
     </dependencies>
   </dependencyManagement>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-checkstyle-plugin</artifactId>
+        <version>3.3.1</version>
+        <configuration>
+          <configLocation>style/checkStyle.xml</configLocation>
+          <consoleOutput>true</consoleOutput>
+          <failsOnError>true</failsOnError>
+          <linkXRef>false</linkXRef>
+          <propertyExpansion>config_loc=style</propertyExpansion>
+        </configuration>
+        <executions>
+          <execution>
+            <id>validate</id>
+            <phase>validate</phase>
+            <goals>
+              <goal>check</goal>
+            </goals>
+          </execution>
+        </executions>
+      </plugin>
+    </plugins>
+  </build>
 </project>

style/checkStyle.xml

@@ -23,7 +23,7 @@
 <module name="Checker">
 
   <property name="charset" value="UTF-8"/>
-  <property name="severity" value="warning"/>
+  <property name="severity" value="error"/>
   <property name="fileExtensions" value="java, properties, xml, gradle, env, sh"/>
   <module name="SuppressWarningsFilter" />
   <module name="Header">