Postgres database giving Cannot establish a connection erorr [closed]

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I am receiving an error that shown in below, when l try to connect my PostgreSQL database

Cannot establish a connection to jdbc:postgresql://localhost:5432/postgres using org.postgresql.Driver (FATAL: password authentication failed for user "postgres ")

Answer 1

FATAL: password authentication failed for user "postgres"

You haven't set a password for the user postgres or you are supplying the wrong password.

See:

• Client Authentication
• pg_hba.conf