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Why do I get a No suitable driver found error? [duplicate]

This question already has answers here:
Connect Java to a MySQL database
(14 answers)
What is a classpath and how do I set it?
(10 answers)
Closed 2 years ago.
I'm trying to connect to a database on localhost. Mysql is running and the database name is employees. I confirmed that the port, username, and password are correct.
The java, class, and jar file are in the same folder. I tried adding the jar file to my CLASSPATH in the system environment variables and I tried adding it using -cp like below.
javac -cp . relearnjdbc.java
javac -cp ./mysql-connector-java-8.0.20.jar relearnjdbc.java
javac -cp *.jar relearnjdbc.java
I also tried separating the files into their own folders src, class, and bin.
javac -cp ../bin -d ../class relearnjdbc.java
This is my code
public class relearnjdbc {
public static String url = "jdbc:mysql://localhost:3306/employees";
public static String username = "root";
public static String password = "root";
public static void main(String[] args){
System.out.println("Connecting to DB...");
try{
//Class.forName("com.mysql.jdbc.Driver");
Class.forName("com.mysql.jdbc.Driver").newInstance();
//Connection connection = DriverManager.getConnection(url, username, password);
DriverManager.getConnection(url, username, password);
System.out.println("Connected!");
}catch (Exception e){
throw new IllegalStateException("cannot connect to DB ", e);
}
}
}
These give java.lang.ClassNotFoundException. I know its deprecated, but it was in a lot of answers to similar questions.
Class.forName("com.mysql.jdbc.Driver").newInstance();
Class.forName("com.mysql.jdbc.Driver");
I'm not using an IDE, tomcat, netbeans, apache, phpadmin, or anything else. As far as I can tell a lot of other people that have asked this question were using one of these or they didn't have the jar file in their classpath.

The name of the class that implements java.sql.Driver in MySQL Connector/J has changed from com.mysql.jdbc.Driver to com.mysql.cj.jdbc.Driver. The old class name has been deprecated docs
try Class.forName("com.mysql.cj.jdbc.Driver").newInstance();

IntelliJ - Problem connecting to PostgreSQL

I am new to PostgreSQL (I normally use other database engines), and I also do not use Java often.
My Problem is that I get the following exception:
java.sql.SQLException: No suitable driver found for DATABASE_NAME
java.sql/java.sql.DriverManager.getConnection(DriverManager.java:702)
at
java.sql/java.sql.DriverManager.getConnection(DriverManager.java:228)
I followed this tutorial: http://www.postgresqltutorial.com/postgresql-jdbc/connecting-to-postgresql-database/ and added postgresql-42.2.5.jar as a library.
The problem is that adding the driver as a library, as can be seen in the screenshot, has no effect.
So my question is: how do I connect to a PostgreSQL database using Java and the latest IntelliJ?
Any help would be appreciated.
UPDATE 1:
UPDATE 2:
Since the code has been requested: I have replaced the original code by a minimal code that will cause the error:
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class IngestData
{
protected static String url;
protected static final String user = "user";
protected static final String password = "password";
public static void main(String[] args)
{
Connection connection = null;
url = args[args.length-1];
try
{
connection = DriverManager.getConnection(url, user, password);
System.out.println("SUCCESS");
} catch (SQLException e)
{
System.out.println("ERROR");
e.printStackTrace();
}
}
}
The console output is:
ERROR
java.sql.SQLException: No suitable driver found for http://127.0.0.1:10282/db01617792
at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:702)
at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:228)
at IngestData.main(IngestData.java:17)
Process finished with exit code 0
Here is the link to the git repository containing the code:
https://github.com/ka6555/StackOverflow-Postgresql-Problem.git
UPDATE 3:
I found the error:
I need to change
protected static String url;
to
protected static String url = "jdbc:postgresql://";
and
url = args[args.length-1];
to
url += args[args.length-1];
While this solves my original problem, the program is now stuck executing the following line:
connection = DriverManager.getConnection(url, user, password);
There is no error but the program will simply run like with an endless loop never going beyond this code line.
UPDATE 4:
I have fixed all problems now.

It seems like you are missing the postgres jar file in your project dependencies.
Open the Project Structure (Ctrl+Alt+Shift+S on Windows)
Select modules / dependencies tab
You should see something like the following:
If the postgres dependency is missing:
Klick on the + sign on the right side of the screenshot
Choose Library/Project Library and your postgres jar file
Your code should now run. Let me know if it helps.
Note: Please provide your minmal working code on GitHub for a quicker response.

The main problem was that I used a command line parameter as the database url without prefixing it with jdbc:postgresql://. Additionally, I had to reinstall postgresql because of some odd behavior I could not figure out the reason for.

This is the message you get when the URL syntax is incorrect.
This is the requirement.

Why I obtain this SQLException (No suitable driver) when I try to create a Connection object for an Oracle database?

I have to create a very simple batch Java application (an application that run into shell) and that perform some query on an Oracle database using JDBC and I never done it.
I am following this tutorial: http://www.ntu.edu.sg/home/ehchua/programming/java/JDBC_Basic.html
So I have done in this way to allocate a new Connection object for my application:
import java.sql.*;
public class Main {
public static void main(String[] args) {
System.out.println("Hello World !!!");
String partitaIVA = args[0];
String nomePDF = args[1];
Connection conn = null;
Statement stmt = null;
try {
// Step 1: Allocate a database "Connection" object
conn = DriverManager.getConnection("jdbc:oracle:thin:#XXX.XXX.XXX.XXX:1521:eme1", "myUserName", "myPswd"); // Oracle DB
} catch(SQLException ex) {
ex.printStackTrace();
}
}
}
The problem is that when I run the application it seems that the SQLException is thrown because enter into the catch block and print the following error message in the console:
java.sql.SQLException: No suitable driver found for jdbc:oracle:thin:#XXX.XXX.XXX.XXX:1521:eme1
at java.sql.DriverManager.getConnection(DriverManager.java:602)
at java.sql.DriverManager.getConnection(DriverManager.java:185)
at Main.main(Main.java:16)
Why? What cause this problem and how can I fix this issue? What am I missing?
Tnx

You need to have an appropriate ojdbc.jar in you classpath. E.g. see Oracle JDBC ojdbc6 Jar as a Maven Dependency
The problem should be that the linked tutorial describes how to connect to a Mysql, but you're trying to connect to an oracle - therefore you need the oracle driver in your classpath.

How about following oracle's documentation for its Driver. http://docs.oracle.com/cd/E11882_01/appdev.112/e13995/oracle/jdbc/OracleDriver.html
In the above code, you didn't registered the driver class.
Class.forName ("oracle.jdbc.OracleDriver");

If you are following instructions from the given link.
In chapter 2.2 you have instructions how to instal MySql drivers.
If you are using an Oracle database, then you'll need to instal Oracle JDBC drivers.
If you don't want affect your JDK installation like in tutorial, you can load driver dynamicaly

Issues with Class.forName in Java code using Eclipse IDE

I am using Eclipse IDE Version: Helios Service Release 2 and JDK version 1.6. I have SQL Server 2008 installed on my system. I have downloaded Microsoft JDBC driver and included the path of the jar file in Eclipse IDE-> Project Properties->Java build Path-> Libraries -> Add External jars.
I have written this piece of code for database connection:
package com.ucs.test;
import java.sql.*;
public class ConnectDatabase {
Connection DBconnection = null;
String dbName = "silkopenview";
String userName = "SilkTestAdmin";
String password = "Nbv12345";
Class.forName(drivername);
DBconnection = DriverManager.getConnection(dbName,userName,password);
}
But I get the following errors:
Syntax error on token "DBconnection", VariableDeclaratorId expected after this token
Syntax error on token "drivername", VariableDeclaratorId expected after this token
Syntax error on token(s), misplaced construct(s)
I am new to Java and Eclipse IDE. Please help me in correcting this errors. A quick help is appreciated.

These statements:
Class.forName(drivername);
DBconnection = DriverManager.getConnection(dbName,userName,password);
are currently just part of the class - not in a method, or constructor, or static initializer etc. You probably want to put them in a constructor. The previous ones are okay, as they're variable declarations - although whether you really want them to be instance variables is a different matter.
Also note that driverName isn't declared anywhere in the code you've given.
On a tangential note, if you're sufficiently new to Java that you're running into this sort of thing, you should abandon your current code completely: you're currently trying to run before you can walk. Talking to databases correctly is non-trivial, and trying to learn how to do that while also learning Java syntax is going to be messy. Start with simple console apps that let you learn the language and some of the core types (strings, numbers, collections etc) and then move on to databases.

Class.forName(drivername);
DBconnection = DriverManager.getConnection(dbName,userName,password);
You can not put them where you placed in your class, You have to put them in constructor/method, like :
public class ConnectDatabase {
Connection dbConnection = null;
String dbName = "silkopenview";
String userName = "SilkTestAdmin";
String password = "Nbv12345";
public Connection getConnection() {
Class.forName(drivername);
dbConnection = DriverManager.getConnection(dbName,userName,password);
return dbConnection;
}
}

You need to place your statements in a method rather than in the class block.
Class.forName(drivername);
and
DBconnection = DriverManager.getConnection(dbName,userName,password);
Given that you're using SQL Server, you will need to declare your driverName:
final String driverName = "com.microsoft.sqlserver.jdbc.SQLServerDriver";

Get mysql and java to work together

I have Eclipse Indigo on Mac Os X and I have downloaded mysql connector (version 5.1).
I have added the jar to the project and I am using this code:
public class Test
{
public static void main (String[] args)
{
try {
String url = "jdbc:msql://200.210.220.1:1114/Demo";
Connection conn = DriverManager.getConnection(url,"","");
Statement stmt = conn.createStatement();
ResultSet rs;
rs = stmt.executeQuery("SELECT Lname FROM Customers WHERE Snum = 2001");
while ( rs.next() ) {
String lastName = rs.getString("Lname");
System.out.println(lastName);
}
conn.close();
} catch (Exception e) {
System.err.println("Got an exception! ");
System.err.println(e.getMessage());
}
}
}
When I try to execute the program I get this exception:
Got an exception!
No suitable driver found for jdbc:msql://200.210.220.1:1114/Demo
My question is : how to install the driver? What else should I do?
And once installed the driver, how do I get my database URL (I am using mysql 5.5)?
I haven't found a valid guide on the web, they're all too specific.

Your JDBC connection URL is not correct, refer to the official documentation to check the required format for the URL .
In your case the URL will become :
String url = "jdbc:mysql://200.210.220.1:1114/Demo";

you're missing the "y" in jdbc:mysql

You are using MySQL, the URL should look like this:
jdbc:mysql://200.210.220.1:1114/Demo
may be, review the IP and PORT.

You may have added the jar to your project but have you also added it to the project classpath? Having the jar exist as a file in your project won't solve the problem. The jar file is clearly not accessible to your program. Right click on your project -> Build Path -> add the jar there.
Database URL looks ok, assuming you have the right host address and port number.