fix other module checkstyle issue

hugegraph-dist/src/main/java/com/baidu/hugegraph/cmd/ConfDumper.java

@@ -25,26 +25,32 @@
 
 import org.apache.commons.configuration.ConfigurationException;
 import org.apache.commons.io.FileUtils;
+import org.slf4j.Logger;
 
 import com.baidu.hugegraph.config.HugeConfig;
 import com.baidu.hugegraph.config.OptionSpace;
 import com.baidu.hugegraph.config.TypedOption;
 import com.baidu.hugegraph.dist.RegisterUtil;
+import com.baidu.hugegraph.server.RestServer;
 import com.baidu.hugegraph.util.E;
+import com.baidu.hugegraph.util.Log;
 
 public class ConfDumper {
 
     public static final String EOL = System.getProperty("line.separator");
 
+    private static final Logger LOG = Log.logger(ConfDumper.class);
+
     public static void main(String[] args)
                        throws ConfigurationException, IOException {
         E.checkArgument(args.length == 1,
                         "ConfDumper need a config file.");
 
         String input = args[0];
         File output = new File(input + ".default");
-        System.out.println("Input config: " + input);
-        System.out.println("Output config: " + output.getPath());
+
+        LOG.info("Input config: {}", input);
+        LOG.info("Output config: {}", output.getPath());
 
         RegisterUtil.registerBackends();
         RegisterUtil.registerServer();

hugegraph-dist/src/main/java/com/baidu/hugegraph/cmd/InitStore.java

@@ -47,15 +47,15 @@ public class InitStore {
     // Less than 5000 may cause mismatch exception with Cassandra backend
     private static final long RETRY_INTERVAL = 5000;
 
-    private static final MultiValueMap exceptions = new MultiValueMap();
+    private static final MultiValueMap EXCEPTIONS = new MultiValueMap();
 
     static {
-        exceptions.put("OperationTimedOutException",
+        EXCEPTIONS.put("OperationTimedOutException",
                        "Timed out waiting for server response");
-        exceptions.put("NoHostAvailableException",
+        EXCEPTIONS.put("NoHostAvailableException",
                        "All host(s) tried for query failed");
-        exceptions.put("InvalidQueryException", "does not exist");
-        exceptions.put("InvalidQueryException", "unconfigured table");
+        EXCEPTIONS.put("InvalidQueryException", "does not exist");
+        EXCEPTIONS.put("InvalidQueryException", "unconfigured table");
     }
 
     public static void main(String[] args) throws Exception {
@@ -114,9 +114,9 @@ private static void initBackend(final HugeGraph graph)
             } catch (Exception e) {
                 String clz = e.getClass().getSimpleName();
                 String message = e.getMessage();
-                if (exceptions.containsKey(clz) && retries > 0) {
+                if (EXCEPTIONS.containsKey(clz) && retries > 0) {
                     @SuppressWarnings("unchecked")
-                    Collection<String> keywords = exceptions.getCollection(clz);
+                    Collection<String> keywords = EXCEPTIONS.getCollection(clz);
                     for (String keyword : keywords) {
                         if (message.contains(keyword)) {
                             LOG.info("Init failed with exception '{} : {}', " +

hugegraph-dist/src/main/java/com/baidu/hugegraph/cmd/StoreDumper.java

@@ -22,21 +22,26 @@
 import java.util.Iterator;
 
 import org.apache.tinkerpop.gremlin.structure.util.CloseableIterator;
+import org.slf4j.Logger;
 
 import com.baidu.hugegraph.HugeFactory;
 import com.baidu.hugegraph.HugeGraph;
 import com.baidu.hugegraph.backend.query.Query;
 import com.baidu.hugegraph.backend.store.BackendEntry;
 import com.baidu.hugegraph.backend.store.BackendStore;
 import com.baidu.hugegraph.dist.RegisterUtil;
+import com.baidu.hugegraph.server.RestServer;
 import com.baidu.hugegraph.testutil.Whitebox;
 import com.baidu.hugegraph.type.HugeType;
 import com.baidu.hugegraph.util.E;
+import com.baidu.hugegraph.util.Log;
 
 public class StoreDumper {
 
     private final HugeGraph graph;
 
+    private static final Logger LOG = Log.logger(StoreDumper.class);
+
     public StoreDumper(String conf) {
         this.graph = HugeFactory.open(conf);
     }
@@ -49,12 +54,12 @@ public void dump(HugeType table, long offset, long limit) {
         for (long i = 0; i < offset && rs.hasNext(); i++) {
             rs.next();
         }
-        String title = String.format("Dump table %s (offset %d limit %d):",
-                                     table, offset, limit);
-        System.out.println(title);
+
+        LOG.info("Dump table {} (offset {} limit {}):", table, offset, limit);
+
         for (long i = 0; i < limit && rs.hasNext(); i++) {
             BackendEntry entry = rs.next();
-            System.out.println(entry);
+            LOG.info("{}", entry);
         }
 
         CloseableIterator.closeIterator(rs);

hugegraph-dist/src/main/java/com/baidu/hugegraph/dist/RegisterUtil.java

@@ -19,16 +19,13 @@
 
 package com.baidu.hugegraph.dist;
 
-import java.io.InputStream;
 import java.net.URL;
 import java.util.List;
 import java.util.ServiceLoader;
 
-import org.apache.commons.configuration2.Configuration;
 import org.apache.commons.configuration2.PropertiesConfiguration;
 import org.apache.commons.configuration2.builder.fluent.Configurations;
 import org.apache.commons.configuration2.ex.ConfigurationException;
-import org.apache.kerby.config.Conf;
 import org.slf4j.Logger;
 
 import com.baidu.hugegraph.HugeException;

hugegraph-mysql/src/main/java/com/baidu/hugegraph/backend/store/mysql/MysqlTables.java

@@ -43,7 +43,6 @@
 import com.baidu.hugegraph.util.E;
 import com.google.common.collect.ImmutableMap;
 
-
 public class MysqlTables {
 
     public static final String BOOLEAN = "BOOLEAN";
@@ -108,7 +107,7 @@ public long getCounter(Session session, HugeType type) {
 
             String select = String.format("SELECT ID FROM %s WHERE %s = '%s';",
                                           this.table(), schemaCol, type.name());
-            try (ResultSetWrapper results = session.select(select)){
+            try (ResultSetWrapper results = session.select(select)) {
                 ResultSet rs = results.resultSet();
                 if (rs.next()) {
                     return rs.getLong(idCol);

hugegraph-mysql/src/main/java/com/baidu/hugegraph/backend/store/mysql/ResultSetWrapper.java

@@ -6,7 +6,7 @@
 import java.sql.SQLException;
 import java.sql.Statement;
 
-public class ResultSetWrapper implements AutoCloseable{
+public class ResultSetWrapper implements AutoCloseable {
 
     private final ResultSet resultSet;
     private final Statement statement;

hugegraph-palo/src/main/java/com/baidu/hugegraph/backend/store/palo/PaloSessions.java

@@ -197,7 +197,7 @@ private PaloFile getOrCreate(String table) {
         @SuppressWarnings("unused")
         private PaloLoadInfo getLoadInfoByLabel(String label) {
             String sql = String.format("SHOW LOAD WHERE LABEL = '%s'", label);
-            try (ResultSetWrapper results = this.select(sql)){
+            try (ResultSetWrapper results = this.select(sql)) {
                 ResultSet rs = results.resultSet();
                 if (rs.next()) {
                     return new PaloLoadInfo(rs);
@@ -213,7 +213,7 @@ private PaloLoadInfo getLoadInfoByLabel(String label) {
     public final class PaloLoadTask extends TimerTask {
 
         private static final String DF = "yyyy-MM-dd-HH-mm-ss";
-        private final SafeDateFormat DATE_FORMAT = new SafeDateFormat(DF);
+        private final SafeDateFormat dateFormat = new SafeDateFormat(DF);
 
         /**
          * There exist two running palo load task corresponds to two stores,
@@ -313,7 +313,7 @@ private void loadThenDelete(PaloFile file) {
         }
 
         private String formatLabel(String table) {
-            return table + "-" + this.DATE_FORMAT.format(new Date());
+            return table + "-" + this.dateFormat.format(new Date());
         }
     }
 }