diff --git a/shardingsphere-ui-backend/src/main/java/org/apache/shardingsphere/ui/servcie/impl/ShardingSchemaServiceImpl.java b/shardingsphere-ui-backend/src/main/java/org/apache/shardingsphere/ui/servcie/impl/ShardingSchemaServiceImpl.java
index fb68cba..0255989 100644
--- a/shardingsphere-ui-backend/src/main/java/org/apache/shardingsphere/ui/servcie/impl/ShardingSchemaServiceImpl.java
+++ b/shardingsphere-ui-backend/src/main/java/org/apache/shardingsphere/ui/servcie/impl/ShardingSchemaServiceImpl.java
@@ -1,144 +1,144 @@
-/*
- * 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.shardingsphere.ui.servcie.impl;
-
-import com.google.common.base.Joiner;
-import com.google.common.base.Preconditions;
-import com.google.common.base.Splitter;
-import com.google.common.base.Strings;
-import org.apache.shardingsphere.governance.repository.api.ConfigurationRepository;
-import org.apache.shardingsphere.infra.config.datasource.DataSourceConfiguration;
-import org.apache.shardingsphere.ui.servcie.ConfigCenterService;
-import org.apache.shardingsphere.ui.servcie.ShardingSchemaService;
-import org.apache.shardingsphere.ui.util.ConfigurationYamlConverter;
-import org.springframework.stereotype.Service;
-
-import javax.annotation.Resource;
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.List;
-import java.util.Map;
-
-/**
- * Implementation of sharding schema service.
- */
-@Service
-public final class ShardingSchemaServiceImpl implements ShardingSchemaService {
-
-    @Resource
-    private ConfigCenterService configCenterService;
-
-    @Override
-    public Collection<String> getAllSchemaNames() {
-        return configCenterService.getActivatedConfigCenter().getChildrenKeys(configCenterService.getActivateConfigurationNode().getMetadataNodePath());
-    }
-    
-    @Override
-    public String getRuleConfiguration(final String schemaName) {
-        return configCenterService.getActivatedConfigCenter().get(configCenterService.getActivateConfigurationNode().getRulePath(schemaName));
-    }
-    
-    @Override
-    public String getDataSourceConfiguration(final String schemaName) {
-        return configCenterService.getActivatedConfigCenter().get(configCenterService.getActivateConfigurationNode().getDataSourcePath(schemaName));
-    }
-    
-    @Override
-    public void updateRuleConfiguration(final String schemaName, final String configData) {
-        checkRuleConfiguration(configData);
-        persistRuleConfiguration(schemaName, configData);
-    }
-    
-    @Override
-    public void updateDataSourceConfiguration(final String schemaName, final String configData) {
-        checkDataSourceConfiguration(configData);
-        persistDataSourceConfiguration(schemaName, configData);
-    }
-    
-    @Override
-    public void addSchemaConfiguration(final String schemaName, final String ruleConfiguration, final String dataSourceConfiguration) {
-        checkSchemaName(schemaName, getAllSchemaNames());
-        checkRuleConfiguration(ruleConfiguration);
-        checkDataSourceConfiguration(dataSourceConfiguration);
-        persistRuleConfiguration(schemaName, ruleConfiguration);
-        persistDataSourceConfiguration(schemaName, dataSourceConfiguration);
-        persistSchemaName(schemaName);
-    }
-    
-    @Override
-    public void deleteSchemaConfiguration(final String schemaName) {
-        ConfigurationRepository configCenterRepository = configCenterService.getActivatedConfigCenter();
-        String schemaNamePath = configCenterService.getActivateConfigurationNode().getSchemaNamePath(schemaName);
-        configCenterRepository.delete(schemaNamePath);
-        String schemaNames = configCenterRepository.get(configCenterService.getActivateConfigurationNode().getMetadataNodePath());
-        List<String> schemaNameList = new ArrayList<>(Splitter.on(",").splitToList(schemaNames));
-        schemaNameList.remove(schemaName);
-        configCenterRepository.persist(configCenterService.getActivateConfigurationNode().getMetadataNodePath(), Joiner.on(",").join(schemaNameList));
-    }
-
-    @Override
-    public String getMetadataConfiguration(final String schemaName) {
-        return configCenterService.getActivatedConfigCenter().get(
-                configCenterService.getActivateConfigurationNode().getSchemaPath(schemaName));
-    }
-
-    private void checkRuleConfiguration(final String configData) {
-        try {
-            ConfigurationYamlConverter.loadRuleConfigurations(configData);
-            // CHECKSTYLE:OFF
-        } catch (final Exception ex) {
-            // CHECKSTYLE:ON
-            throw new IllegalArgumentException("rule configuration is invalid.", ex);
-        }
-    }
-    
-    private void persistRuleConfiguration(final String schemaName, final String ruleConfiguration) {
-        configCenterService.getActivatedConfigCenter().persist(configCenterService.getActivateConfigurationNode().getRulePath(schemaName), ruleConfiguration);
-    }
-    
-    private void checkDataSourceConfiguration(final String configData) {
-        try {
-            Map<String, DataSourceConfiguration> dataSourceConfigs = ConfigurationYamlConverter.loadDataSourceConfigurations(configData);
-            Preconditions.checkState(!dataSourceConfigs.isEmpty(), "data source configuration is invalid.");
-            // CHECKSTYLE:OFF
-        } catch (final Exception ex) {
-            // CHECKSTYLE:ON
-            throw new IllegalArgumentException("data source configuration is invalid.");
-        }
-    }
-    
-    private void persistDataSourceConfiguration(final String schemaName, final String dataSourceConfiguration) {
-        configCenterService.getActivatedConfigCenter().persist(configCenterService.getActivateConfigurationNode().getDataSourcePath(schemaName), dataSourceConfiguration);
-    }
-    
-    private void checkSchemaName(final String schemaName, final Collection<String> existedSchemaNames) {
-        Preconditions.checkArgument(!Strings.isNullOrEmpty(schemaName), "schema name is invalid.");
-        Preconditions.checkArgument(!existedSchemaNames.contains(schemaName), "schema name already exists.");
-    }
-    
-    private void persistSchemaName(final String schemaName) {
-        ConfigurationRepository configCenterRepository = configCenterService.getActivatedConfigCenter();
-        String schemaPath = configCenterService.getActivateConfigurationNode().getMetadataNodePath();
-        String schemaNames = configCenterRepository.get(schemaPath);
-        List<String> schemaNameList = Strings.isNullOrEmpty(schemaNames) ? new ArrayList<>() : new ArrayList<>(Splitter.on(",").splitToList(schemaNames));
-        if (!schemaNameList.contains(schemaName)) {
-            schemaNameList.add(schemaName);
-            configCenterRepository.persist(schemaPath, Joiner.on(",").join(schemaNameList));
-        }
-    }
-}
+/*
+ * 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.shardingsphere.ui.servcie.impl;
+
+import com.google.common.base.Joiner;
+import com.google.common.base.Preconditions;
+import com.google.common.base.Splitter;
+import com.google.common.base.Strings;
+import org.apache.shardingsphere.governance.repository.api.ConfigurationRepository;
+import org.apache.shardingsphere.infra.config.datasource.DataSourceConfiguration;
+import org.apache.shardingsphere.ui.servcie.ConfigCenterService;
+import org.apache.shardingsphere.ui.servcie.ShardingSchemaService;
+import org.apache.shardingsphere.ui.util.ConfigurationYamlConverter;
+import org.springframework.stereotype.Service;
+
+import javax.annotation.Resource;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Implementation of sharding schema service.
+ */
+@Service
+public final class ShardingSchemaServiceImpl implements ShardingSchemaService {
+
+    @Resource
+    private ConfigCenterService configCenterService;
+
+    @Override
+    public Collection<String> getAllSchemaNames() {
+        return configCenterService.getActivatedConfigCenter().getChildrenKeys(configCenterService.getActivateConfigurationNode().getMetadataNodePath());
+    }
+    
+    @Override
+    public String getRuleConfiguration(final String schemaName) {
+        return configCenterService.getActivatedConfigCenter().get(configCenterService.getActivateConfigurationNode().getRulePath(schemaName));
+    }
+    
+    @Override
+    public String getDataSourceConfiguration(final String schemaName) {
+        return configCenterService.getActivatedConfigCenter().get(configCenterService.getActivateConfigurationNode().getDataSourcePath(schemaName));
+    }
+    
+    @Override
+    public void updateRuleConfiguration(final String schemaName, final String configData) {
+        checkRuleConfiguration(configData);
+        persistRuleConfiguration(schemaName, configData);
+    }
+    
+    @Override
+    public void updateDataSourceConfiguration(final String schemaName, final String configData) {
+        checkDataSourceConfiguration(configData);
+        persistDataSourceConfiguration(schemaName, configData);
+    }
+    
+    @Override
+    public void addSchemaConfiguration(final String schemaName, final String ruleConfiguration, final String dataSourceConfiguration) {
+        checkSchemaName(schemaName, getAllSchemaNames());
+        checkRuleConfiguration(ruleConfiguration);
+        checkDataSourceConfiguration(dataSourceConfiguration);
+        persistRuleConfiguration(schemaName, ruleConfiguration);
+        persistDataSourceConfiguration(schemaName, dataSourceConfiguration);
+        persistSchemaName(schemaName);
+    }
+    
+    @Override
+    public void deleteSchemaConfiguration(final String schemaName) {
+        ConfigurationRepository configCenterRepository = configCenterService.getActivatedConfigCenter();
+        String schemaNamePath = configCenterService.getActivateConfigurationNode().getSchemaNamePath(schemaName);
+        configCenterRepository.delete(schemaNamePath);
+        String schemaNames = configCenterRepository.get(configCenterService.getActivateConfigurationNode().getMetadataNodePath());
+        List<String> schemaNameList = new ArrayList<>(Splitter.on(",").splitToList(schemaNames));
+        schemaNameList.remove(schemaName);
+        configCenterRepository.persist(configCenterService.getActivateConfigurationNode().getMetadataNodePath(), Joiner.on(",").join(schemaNameList));
+    }
+
+    @Override
+    public String getMetadataConfiguration(final String schemaName) {
+        return configCenterService.getActivatedConfigCenter().get(
+                configCenterService.getActivateConfigurationNode().getSchemaPath(schemaName));
+    }
+
+    private void checkRuleConfiguration(final String configData) {
+        try {
+            ConfigurationYamlConverter.loadRuleConfigurations(configData);
+            // CHECKSTYLE:OFF
+        } catch (final Exception ex) {
+            // CHECKSTYLE:ON
+            throw new IllegalArgumentException("rule configuration is invalid.", ex);
+        }
+    }
+    
+    private void persistRuleConfiguration(final String schemaName, final String ruleConfiguration) {
+        configCenterService.getActivatedConfigCenter().persist(configCenterService.getActivateConfigurationNode().getRulePath(schemaName), ruleConfiguration);
+    }
+    
+    private void checkDataSourceConfiguration(final String configData) {
+        try {
+            Map<String, DataSourceConfiguration> dataSourceConfigs = ConfigurationYamlConverter.loadDataSourceConfigurations(configData);
+            Preconditions.checkState(!dataSourceConfigs.isEmpty(), "data source configuration is invalid.");
+            // CHECKSTYLE:OFF
+        } catch (final Exception ex) {
+            // CHECKSTYLE:ON
+            throw new IllegalArgumentException("data source configuration is invalid.");
+        }
+    }
+    
+    private void persistDataSourceConfiguration(final String schemaName, final String dataSourceConfiguration) {
+        configCenterService.getActivatedConfigCenter().persist(configCenterService.getActivateConfigurationNode().getDataSourcePath(schemaName), dataSourceConfiguration);
+    }
+    
+    private void checkSchemaName(final String schemaName, final Collection<String> existedSchemaNames) {
+        Preconditions.checkArgument(!Strings.isNullOrEmpty(schemaName), "schema name is invalid.");
+        Preconditions.checkArgument(!existedSchemaNames.contains(schemaName), "schema name already exists.");
+    }
+    
+    private void persistSchemaName(final String schemaName) {
+        ConfigurationRepository configCenterRepository = configCenterService.getActivatedConfigCenter();
+        String schemaPath = configCenterService.getActivateConfigurationNode().getMetadataNodePath();
+        String schemaNames = configCenterRepository.get(schemaPath);
+        List<String> schemaNameList = Strings.isNullOrEmpty(schemaNames) ? new ArrayList<>() : new ArrayList<>(Splitter.on(",").splitToList(schemaNames));
+        if (!schemaNameList.contains(schemaName)) {
+            schemaNameList.add(schemaName);
+            configCenterRepository.persist(schemaPath, Joiner.on(",").join(schemaNameList));
+        }
+    }
+}