diff --git a/jdbc/src/main/java/org/apache/zeppelin/jdbc/JDBCInterpreter.java b/jdbc/src/main/java/org/apache/zeppelin/jdbc/JDBCInterpreter.java
index 6403cca5c0..8d6577e303 100644
--- a/jdbc/src/main/java/org/apache/zeppelin/jdbc/JDBCInterpreter.java
+++ b/jdbc/src/main/java/org/apache/zeppelin/jdbc/JDBCInterpreter.java
@@ -17,11 +17,24 @@ package org.apache.zeppelin.jdbc;
 import static org.apache.commons.lang.StringUtils.containsIgnoreCase;
 import static org.apache.commons.lang.StringUtils.isEmpty;
 import static org.apache.commons.lang.StringUtils.isNotEmpty;
-import java.io.*;
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+import java.io.IOException;
 import java.nio.charset.StandardCharsets;
 import java.security.PrivilegedExceptionAction;
-import java.sql.*;
-import java.util.*;
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.ResultSet;
+import java.sql.ResultSetMetaData;
+import java.sql.SQLException;
+import java.sql.Statement;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Properties;
+import java.util.Set;
 
 import org.apache.commons.dbcp2.ConnectionFactory;
 import org.apache.commons.dbcp2.DriverManagerConnectionFactory;