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Can`t connect to PostgreSQL database in Pentaho Kettle

I`m trying to connect to my PostgreSQL database. What I create a connection and click the button "Test", I receive an error message. I can connect to this db via pgadmin without any problems, so it is not a connection or credentials issue
I`m using Pentaho kettle 8.3, Windows, java version "1.8.0_231"
Error connecting to database [Name] :org.pentaho.di.core.exception.KettleDatabaseException:
Error occurred while trying to connect to the database
Error connecting to database: (using class org.postgresql.Driver)
Ошибка при попытке подсоединения.
Full error stack: https://pastebin.com/cLiB288e

Try to add postgresql-42.1.1.jar in the /lib folder of PDI, restart the spoon and try again.

i faced 2 issues myself connecting to PostgreSQL few months back and following 2 things helped me
1.add postgres-42.1.1jar file in the 'lib' folder under PDI and restart the spoon.
if the normal JDBC connection convention does not work for you try below tip
while configuring the connection specify host name as follows
{HOST IP}:{HOST PORT}/{instance name}?

Netbeans cannot establish a connection to jdbc

I'm trying to create a JDBC connection between a project in Netbeans and a MySQL database. In the Netbeans connection wizard I receive the following
error: Cannot establish a connection to jdbc:mysql://localhost:3306/murach using com.mysql.jdbc.Driver (Unable to load authentication plugin 'caching_sha2_password'.)
I'm running Netbeans 8.2, MySQL 8.0.15 and Java JDK 1.8.0_201. I am able to connect to the database using the credentials supplied in the wizard via the command prompt.
I also confirmed that port 3306 is open in Windows Firewall.

make the driver something like com.mysql5.jdbc.Driver

Connecting Netbeans and MySQL but getting Big Integer error

So I am trying to add new connection to my Netbeans' database which is MySQL but I am getting Big Integer casting error can someone please help me?
In detail:
I right click on existing MySQL Server at localhost:3306 [root(disconnected) >> select connect and this pops up
Unable to connect to the MySQL server:
org.netbeans.api.db.explorer.DatabaseException: org.netbeans.api.db.explorer.DatabaseException: java.sql.SQLException: java.lang.ClassCastException: java.math.BigInteger cannot be cast to java.lang.Long.
The server may not be running or your MySQL connection properties may not be set correctly. Do you want to edit your MySQL connection properties?
And my basic and admin properties are OK.
And I tried this too: Right click on databases >> select New Connection >> Driver: MySQL(Connector/J driver), JDBC URL: jdbc:mysql://localhost:3306/mysql , but when I test the connection it gives me the same error.
**MySQL server is running.
Thank you.

This is a JDBC Driver problem
I had a similar problem in netbeans. I resolved by removing the default driver (Connector/J driver) from the driver list under databases/drivers as shown below.
This happened with jdbc v8.0.12 on mysql v8.0
So after removing the default jdbc driver, I add an old version of the driver mysql-connector-java-5.1.47.
The connection the succeeded.

What is the version of your MySQL driver and your MySQL? If you want to use MySQL 8, for example, you could try to use a MySQL driver which supports MySQL 8.
Try updating your mysql driver.
To install the driver:
1° Go to the services tab, just after databases.
2° Right click on the drivers folder and select add new driver.
3° Click add and look for the .jar of the driver you downloaded.

Remove and clean the jdbc connector jar files already come with netbeans.
Add a new connector jar file to the jdbc library.
(You can download ==> mysql-connector-java/8.0.11
Try again, connection is going to be ok now.

On IntelliJ, how to run JDBC connection on starting Glassfish

In Intellij Idea 12, i'm trying to start glassfish and deploy my application.
I got that error: rg.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLException: Connection could not be allocated because: java.net.ConnectException. Port 1527 closed.
But when I run the same project in Netbeans, I see that Netbeans start the connection on 1527 before starting Glassfish. And the option is checked: "Enable JDBC Driver Deployment".
How can I do the same in Intellij?
Thanks in advance

That was due to the Apache derby server that wasn't running.
I need to run before the script "startNetworkServer" from derby driver to make it work

Errors accessing MSSQL form Xpages using ExtlibX - Driver or JVM not supported

I am trying to connect to SQL from Xpages, so I installed the latest extlibx 9 and downloaded the drivers from microsoft and added it to notes9\data\jvm\lib\ext
Now I get the following errors when trying to query SQL from my xpage:
Error I get in xpages extlibx when using Microsoft SQL Driver sqljdbc.jar
Error while reading the relational data
JRE (Java Runtime Environment) version 1.6 stöds inte av den här drivrutinen. Använd klassbiblioteket sqljdbc4.jar som stöder JDBC 4.0.
In English: JRE (Java Runtime Environment) version 1.6 is not supported by this driver. Use class library sqljdbc4.jar which supports JDBC 4.0.
Error I get in xpages extlibx when using Microsoft SQL Driver sqljdbc4.jar
Error while reading the relational data
Error while creating connection
SQL Server version 8 stöds inte av den här drivrutinen. ClientConnectionId:9195a17a-22f4-4377-a41a-be6f213b05ff
In English: SQL Server version 8 is not supported by this driver
A few years ago there was a file called extlib.driver.mssql_1.0.0.201109061401 which worked just fine using the same SQL server I am using now. but I cannot find that file anymore.
what should I do to get SQL queries working?

Ok, I will answer my own question here
The reason for getting these errors is because I was using the wrong driver.
There are two different version of the drivers so make sure you use the right one
This one do not work
http://www.microsoft.com/en-us/download/details.aspx?displaylang=en&id=11774
This one works
http://www.microsoft.com/en-us/download/details.aspx?id=2505