JDBC SQLException Statement.executeQuery() cannot issue statements that do not produce result sets

String insertQuery ="insert into students values(?,?,?,?)";
Connection connection = DriverManager.getConnection(url,userName,password);
PreparedStatement preparedStatement = connection.prepareStatement(insertQuery);
preparedStatement.executeQuery();

Exception in thread "main" java.sql.SQLException: 
Statement.executeQuery() cannot issue statements that do not produce result sets.

 at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:129)
 at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97)
 at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:89)
 at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:63)
 at com.mysql.cj.jdbc.ClientPreparedStatement.executeQuery(ClientPreparedStatement.java:928)
 at JDBCInsertExample.main(JDBCInsertExample.java:17)

You get SQLException when you try to call executeQuery() on PreparedStatement Object if it does not return a result set, for example, INSERT, UPDATE or DELETE queries.

Replace preparedStatement.executeQuery(); with preparedStatement.execute();