Test connection fails every time

Unexpected HTTP response: 500

Request
{
    "address" => [
        ("subsystem" => "datasources"),
        ("data-source" => "Postgresql")
    ],
    "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
}

Unexpected HTTP response: 500

Request
{
    "address" => [],
    "operation" => "composite",
    "steps" => [{
        "operation" => "test-connection-in-pool",
        "address" => [
            ("host" => "host2"),
            ("server" => "server-one"),
            ("subsystem" => "datasources"),
            ("data-source" => "PostgresDS")
        ]
    }]
}

Response

Internal Server Error
{
    "outcome" => "failed",
    "result" => {"step-1" => {
        "outcome" => "failed",
        "failure-description" => "WFLYJCA0040: failed to invoke operation: WFLYJCA0047: Connection is not valid",
        "rolled-back" => true
    }},
    "failure-description" => "WFLYDC0022: Operation failed or was rolled back on all servers.",
    "rolled-back" => true,
    "server-groups" => {"main-server-group" => {"host" => {"host2" => {"server-one" => {"response" => {
        "outcome" => "failed",
        "result" => {"step-1" => {
            "outcome" => "failed",
            "failure-description" => "WFLYJCA0040: failed to invoke operation: WFLYJCA0047: Connection is not valid",
            "rolled-back" => true
        }},
        "failure-description" => {"WFLYCTL0062: Composite operation failed and was rolled back. Steps that failed:" => {"Operation step-1" => "WFLYJCA0040: failed to invoke operation: WFLYJCA0047: Connection is not valid"}},
        "rolled-back" => true
    }}}}}}
}