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Vaadin Forum4. Other

java.lang.ClassNotFoundException: org.postgresql.Driver

Eugene K
6 years ago Aug 11, 2016 12:46pm

Hello.

I have following error:

java.lang.ClassNotFoundException: org.postgresql.Driver

When tring to use SQLContainer with postgresql. Postgresql eclipce plugin is added to the project. 

Johannes Häyry
6 years ago Aug 12, 2016 5:41am

You are missing PostgreSQL JDBC driver jar in your project. Do you have a Maven project or what is your build method?

Eugene K
6 years ago Aug 12, 2016 5:45am

Johannes Häyry: You are missing PostgreSQL JDBC driver jar in your project. Do you have a Maven project or what is your build method?

Hello, I have add postgresql offical jar file into project through eclipse interface through java build path for project.
My build method is maven.
I also tried manualy put postgre*.jar into resource folder. In fact i managed to connect ot DB somehow, I think the problem was in the connection string. When i'll be near my IDE I'll post currecnt error.
 

Eugene K
6 years ago Aug 12, 2016 1:46pm

Here is the error:

java.lang.ClassNotFoundException: org.postgresql.Driver

Screen of the imported library in eclipse is in the attachment.

The code:

import java.sql.DriverManager;
import java.sql.Connection;
import java.sql.SQLException;

//import org.postgresql.jdbc.Dr;

public class JDBCExample {
    public static void init() {

        System.out.println("-------- PostgreSQL "
                + "JDBC Connection Testing ------------");

        try {

            Class.forName("org.postgresql.Driver");

        } catch (ClassNotFoundException e) {

            System.out.println("Where is your PostgreSQL JDBC Driver? "
                    + "Include in your library path!");
            e.printStackTrace();
            return;

        }

        System.out.println("PostgreSQL JDBC Driver Registered!");

        Connection connection = null;

        try {

            connection = DriverManager.getConnection(
                    "jdbc:postgresql://5.189.246.141:5432/data_base_name", "postgres",
                    "postgres");

        } catch (SQLException e) {

            System.out.println("Connection Failed! Check output console");
            e.printStackTrace();
            return;

        }

        if (connection != null) {
            System.out.println("You made it, take control your database now!");
        } else {
            System.out.println("Failed to make connection!");
        }
    }


}

-------- PostgreSQL JDBC Connection Testing ------------
Where is your PostgreSQL JDBC Driver? Include in your library path!
java.lang.ClassNotFoundException: org.postgresql.Driver

Can you help me with this?
 

Tom Rauchenwald
6 years ago Aug 12, 2016 3:59pm

Why don't you add a maven dependency on the driver? Like

<dependency>
    <groupId>postgresql</groupId>
    <artifactId>postgresql</artifactId>
    <version>9.1-901-1.jdbc4</version>
</dependency>

for example.
Anyway, I'm not an eclipse expert, but you need the driver in the runtime classpath, I suspect that's the problem.
Eclipse has this run configuration thingy, I guess you need to add it there somewhere.

 

+1