Revert "Let name server generate valid JSON response when process topic route queries (#4432)"

This reverts commit 73b9ac8.

Author: yuz10

namesrv/src/main/java/org/apache/rocketmq/namesrv/processor/DefaultRequestProcessor.java

@@ -16,7 +16,6 @@
  */
 package org.apache.rocketmq.namesrv.processor;
 
-import com.alibaba.fastjson.serializer.SerializerFeature;
 import io.netty.channel.ChannelHandlerContext;
 import java.io.UnsupportedEncodingException;
 import java.util.Properties;
@@ -363,9 +362,7 @@ public RemotingCommand getRouteInfoByTopic(ChannelHandlerContext ctx,
                 topicRouteData.setOrderTopicConf(orderTopicConf);
             }
 
-            byte[] content = topicRouteData.encode(SerializerFeature.BrowserCompatible,
-                    SerializerFeature.QuoteFieldNames, SerializerFeature.SkipTransientField,
-                    SerializerFeature.MapSortField);
+            byte[] content = topicRouteData.encode();
             response.setBody(content);
             response.setCode(ResponseCode.SUCCESS);
             response.setRemark(null);

remoting/pom.xml

@@ -40,12 +40,5 @@
             <groupId>${project.groupId}</groupId>
             <artifactId>rocketmq-logging</artifactId>
         </dependency>
-
-        <dependency>
-            <groupId>com.google.code.gson</groupId>
-            <artifactId>gson</artifactId>
-            <version>2.9.0</version>
-            <scope>test</scope>
-        </dependency>
     </dependencies>
 </project>

remoting/src/main/java/org/apache/rocketmq/remoting/protocol/RemotingSerializable.java

@@ -17,8 +17,6 @@
 package org.apache.rocketmq.remoting.protocol;
 
 import com.alibaba.fastjson.JSON;
-import com.alibaba.fastjson.serializer.SerializerFeature;
-
 import java.nio.charset.Charset;
 import java.nio.charset.StandardCharsets;
 
@@ -54,17 +52,6 @@ public byte[] encode() {
         return null;
     }
 
-    /**
-     * Allow call-site to apply specific features according to their requirements.
-     *
-     * @param features Features to apply
-     * @return serialized data.
-     */
-    public byte[] encode(SerializerFeature...features) {
-        final String json = JSON.toJSONString(this, features);
-        return json.getBytes(CHARSET_UTF8);
-    }
-
     public String toJson() {
         return toJson(false);
     }

remoting/src/test/java/org/apache/rocketmq/remoting/protocol/RemotingSerializableTest.java

@@ -16,19 +16,9 @@
  */
 package org.apache.rocketmq.remoting.protocol;
 
-import com.alibaba.fastjson.serializer.SerializerFeature;
-import com.google.gson.Gson;
-import com.google.gson.JsonElement;
-import com.google.gson.TypeAdapter;
-import org.junit.Assert;
-import org.junit.Test;
-
-import java.io.IOException;
-import java.nio.charset.Charset;
 import java.util.Arrays;
-import java.util.HashMap;
 import java.util.List;
-import java.util.Map;
+import org.junit.Test;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
@@ -90,38 +80,6 @@ public void setStringList(List<String> stringList) {
             "}");
     }
 
-    @Test
-    public void testEncode() {
-         class Foo extends RemotingSerializable {
-            Map<Long, String> map = new HashMap<>();
-
-            Foo() {
-             map.put(0L, "Test");
-            }
-
-             public Map<Long, String> getMap() {
-                 return map;
-             }
-         }
-         Foo foo = new Foo();
-         String invalid = new String(foo.encode(), Charset.defaultCharset());
-         String valid = new String(foo.encode(SerializerFeature.BrowserCompatible, SerializerFeature.QuoteFieldNames,
-                 SerializerFeature.MapSortField), Charset.defaultCharset());
-
-         Gson gson = new Gson();
-         final TypeAdapter<JsonElement> strictAdapter = gson.getAdapter(JsonElement.class);
-         try {
-             strictAdapter.fromJson(invalid);
-             Assert.fail("Should have thrown");
-         } catch (IOException ignore) {
-         }
-
-        try {
-            strictAdapter.fromJson(valid);
-        } catch (IOException ignore) {
-            Assert.fail("Should not throw");
-        }
-    }
 }
 
 class Sample {