Error in connection with PostgreSQL 12 by creating a datasource - postgresql

Question

I'm getting an exception while connecting to PostgreSQL 12 by creating a data source via wildfly admin console.
It works fine on my another machine which has PostgreSQL 9.5. and it seems to work fine when I connect without data-source.
try (Connection conn = DriverManager.getConnection(
"jdbc:postgresql://127.0.0.1:5432/registrar", "postgres", "postgres")) {
if (conn != null) {
System.out.println("Connected to the database!");
Statement statement = conn.createStatement();
ResultSet rs = statement.executeQuery("Select * FROM public.user LIMIT 10");
while(rs.next())
System.out.println(rs.getString(2));
} else {
System.out.println("Failed to make connection!");
}
But when I create a data-source like this:
and this the exception that I get when I try to test the connection from UI.
Request
{
"address" => [
("subsystem" => "datasources"),
("data-source" => "RegistrarDS")
],
"operation" => "test-connection-in-pool"
}
Response
Internal Server Error
{
"outcome" => "failed",
"failure-description" => "WFLYJCA0040: failed to invoke operation: WFLYJCA0047: Connection is not valid",
"rolled-back" => true,
"response-headers" => {"process-state" => "reload-required"}
}
Has anything changed in PostgreSQL 12? What could be the issue?

Answer 1

Could be an issue with the datasource-class defined in your driver as described here on issues.redhat.com
If a datasource-class is defined then it takes precedence to create the datasource and as such it can only use connection-properties.
Since there is not a single connection-url property for all drivers, you have to use connection-properties if you are defining the datasource-class.
Another thing you could try is to set "Connection Properties" instead of "Connection URL" and make sure you are using the correct/latest driver jar file.
Also check your Postgresql logs for further info on the exception..
-> https://www.postgresql.org/about/news/2000/