ould not connect to server: Connection refused (0x0000274D/10061) Is the server running on host "localhost" (::1) and accepting TCP/IP connections on port 5432? could not connect to server: Connection

This will show all listeners for the above port...

sudo netstat -pluten | egrep :5432

sudo nmap -sV -Pn -p 5432

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There must be a listener running on port 5432 for you to make a connection to this port.

Post the output of the commands above.

I am using Apache Tomcat version 9
Using windows Operating System and trying to run one dynamic web project trying to connect postgresql server and using Eclipse as IDE.

But getting above mentioned exception.
Driver not found.

I also wanted to ask when I am running a program as java application the I am getting connected.
but when I am trying to run as web project with Apache tomcat as a server I am unable to get the database connection.

Please suggest what may be the issue.

I am attaching the screenshot for which process is running at particular port.

You'll first arrange for Apache + Tomcat to start + serve content.

After this is working, you can follow whatever guide you're using to somehow integrate Apache/Tomcat in to Eclipse.

@ yes Apache tomcat with eclipse working fine but I am not able to connect to database.

Database != Apache/Tomcat

You'll debug this using psql to test your connection, verifying you have a working host/port/user/pass.

Then simply transpose the working host/port/user/pass into your code.