java中的“表名模式不能为NULL或为空”

当我想从databaseMetaData获取表时,我收到此错误：

Exception in thread "main" java.sql.SQLException: Table name pattern can not be NULL or empty.
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:545)
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:513)
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:505)
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:479)
at com.mysql.cj.jdbc.DatabaseMetaData.getTables(DatabaseMetaData.java:3836)
at FindUserTables.main(FindUserTables.java:14)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)

这是我的代码,我的jdbc驱动是mysql-connector-java-6.0.5-bin.jar.发生了什么？

import java.sql.*;
public class FindUserTables {
    public static void main(String[] args)
            throws SQLException,ClassNotFoundException {
        Class.forName("com.mysql.cj.jdbc.Driver");
        System.out.println("Driver loaded");
        Connection connection = DriverManager.getConnection("jdbc:mysql://localhost/javabook ?characterEncoding=utf8&useSSL=false&&serverTimezone=UTC","root","123456");
        System.out.println("Database connected");
        DatabaseMetaData dbMetaData = connection.getMetaData();
        ResultSet rsTables = dbMetaData.getTables(null,null,new String[] {"TABLE"});
        System.out.print("User tables: ");
        while (rsTables.next())
            System.out.print(rsTables.getString("TABLE_NAME") + " ");
        connection.close();
    }
}

DatabaseMetaData dbMetaData = conn.getMetaData();
ResultSet rsTables = dbMetaData.getTables(null,"%",null);
while (rsTables .next()) {
  System.out.print(rsTables.getString(3) + " ");
}

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