When I try to make a test connect in wildfly manager to the added datasource mysql gives an error Unexpected HTTP response: 500. How to fix it?

Question

MySQL

error code
Unknown error

Unexpected HTTP response: 500

Request
{
"address" => [("deployment" => "geoserver.war")],
"operation" => "deploy"
}

Response

Internal Server Error
{
"outcome" => "failed",
"failure-description" => {"JBAS014671: Failed services" => {"jboss.web.deployment.default-host./geoserver" => "org.jboss.msc.service.StartException in service jboss .web.deployment.default-host./geoserver: JBAS018040: Failed to start context"}},
"rolled-back" => true
}