Enable checkstyle and rat plugin for travis CI

.travis.yml

@@ -13,7 +13,7 @@ cache:
 install: true
 
 script:
-  - travis_wait 30 ./mvnw clean package -DskipTests=false -Dcheckstyle.skip=true -Drat.skip=true -Dmaven.javadoc.skip=true
+  - travis_wait 30 ./mvnw clean install -DskipTests=false -Dcheckstyle.skip=false -Drat.skip=false -Dmaven.javadoc.skip=true
 
 after_success:
   - bash <(curl -s https://codecov.io/bash)

dubbo-cluster/src/main/java/org/apache/dubbo/rpc/cluster/RouterFactory.java

@@ -19,15 +19,14 @@
 import org.apache.dubbo.common.URL;
 import org.apache.dubbo.common.extension.Adaptive;
 import org.apache.dubbo.common.extension.SPI;
-import org.apache.dubbo.rpc.Invocation;
 
 /**
  * RouterFactory. (SPI, Singleton, ThreadSafe)
  * <p>
  * <a href="http://en.wikipedia.org/wiki/Routing">Routing</a>
  *
  * @see org.apache.dubbo.rpc.cluster.Cluster#join(Directory)
- * @see org.apache.dubbo.rpc.cluster.Directory#list(Invocation)
+ * @see org.apache.dubbo.rpc.cluster.Directory#list(org.apache.dubbo.rpc.Invocation)
  */
 @SPI
 public interface RouterFactory {

dubbo-remoting/dubbo-remoting-api/src/main/java/org/apache/dubbo/remoting/Transporter.java

@@ -21,8 +21,6 @@
 import org.apache.dubbo.common.extension.Adaptive;
 import org.apache.dubbo.common.extension.SPI;
 
-import javax.sound.midi.Receiver;
-
 /**
  * Transporter. (SPI, Singleton, ThreadSafe)
  * <p>
@@ -41,7 +39,7 @@ public interface Transporter {
      * @param handler
      * @return server
      * @throws RemotingException
-     * @see org.apache.dubbo.remoting.Transporters#bind(URL, Receiver, ChannelHandler)
+     * @see org.apache.dubbo.remoting.Transporters#bind(URL, ChannelHandler...)
      */
     @Adaptive({Constants.SERVER_KEY, Constants.TRANSPORTER_KEY})
     Server bind(URL url, ChannelHandler handler) throws RemotingException;
@@ -53,7 +51,7 @@ public interface Transporter {
      * @param handler
      * @return client
      * @throws RemotingException
-     * @see org.apache.dubbo.remoting.Transporters#connect(URL, Receiver, ChannelListener)
+     * @see org.apache.dubbo.remoting.Transporters#connect(URL, ChannelHandler...)
      */
     @Adaptive({Constants.CLIENT_KEY, Constants.TRANSPORTER_KEY})
     Client connect(URL url, ChannelHandler handler) throws RemotingException;

dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/InvokerListener.java

@@ -16,7 +16,6 @@
  */
 package org.apache.dubbo.rpc;
 
-import org.apache.dubbo.common.URL;
 import org.apache.dubbo.common.extension.SPI;
 
 /**
@@ -30,7 +29,7 @@ public interface InvokerListener {
      *
      * @param invoker
      * @throws RpcException
-     * @see org.apache.dubbo.rpc.Protocol#refer(Class, URL)
+     * @see org.apache.dubbo.rpc.Protocol#refer(Class, org.apache.dubbo.common.URL)
      */
     void referred(Invoker<?> invoker) throws RpcException;
 

dubbo-rpc/dubbo-rpc-hessian/src/main/java/org/apache/dubbo/rpc/protocol/hessian/HttpClientConnectionFactory.java

@@ -24,11 +24,8 @@
 import com.caucho.hessian.client.HessianProxyFactory;
 import org.apache.http.client.HttpClient;
 import org.apache.http.client.config.RequestConfig;
-import org.apache.http.impl.client.DefaultHttpClient;
 import org.apache.http.impl.client.HttpClientBuilder;
-import org.apache.http.params.HttpConnectionParams;
 
-import java.io.IOException;
 import java.net.URL;
 
 /**

pom.xml

@@ -261,10 +261,10 @@
                                 <configuration>
                                     <configLocation>codestyle/checkstyle.xml</configLocation>
                                     <suppressionsLocation>codestyle/checkstyle-suppressions.xml</suppressionsLocation>
-                                    <headerLocation>codestyle/checkstyle-header.txt</headerLocation>
                                     <encoding>UTF-8</encoding>
                                     <consoleOutput>true</consoleOutput>
                                     <failOnViolation>true</failOnViolation>
+                                    <excludes>**/JSONWriter.java</excludes>
                                 </configuration>
                                 <goals>
                                     <goal>check</goal>
@@ -324,20 +324,11 @@
         <!-- Used for packaging NOTICE & LICENSE to each sub-module jar-->
         <resources>
             <resource>
-                <directory>src/main/resources/</directory>
+                <directory>src/main/resources</directory>
                 <filtering>false</filtering>
             </resource>
             <resource>
-                <directory>../</directory>
-                <targetPath>META-INF/</targetPath>
-                <filtering>false</filtering>
-                <includes>
-                    <include>NOTICE</include>
-                    <include>LICENSE</include>
-                </includes>
-            </resource>
-            <resource>
-                <directory>../../</directory>
+                <directory>${maven.multiModuleProjectDirectory}</directory>
                 <targetPath>META-INF/</targetPath>
                 <filtering>false</filtering>
                 <includes>