I'm trying to connect my database in Wildfly to jJva. Unfortunately I get an error sayign the connection and login failed. How do I solve this?

When I try to test my connection in wildfly management, I get error:

WFLYJCA0040: failed to invoke operation: WFLYJCA0047: Connection is not valid

standalone-full.xml

<datasource jndi-name="java:jboss/datasources/kundeDS" pool-name="kundeDS">

                    <connection-url>jdbc:mysql://localhost:3306/kunde</connection-url>

                    <driver>mysql</driver>

                    <security>

                        <user-name>test</user-name>

                        <password>1234</password>

                    </security>

                    <validation>

                        <valid-connection-checker class-name="org.jboss.jca.adapters.jdbc.extensions.mysql.MySQLValidConnectionChecker"/>

                        <background-validation>true</background-validation>

                        <exception-sorter class-name="org.jboss.jca.adapters.jdbc.extensions.mysql.MySQLExceptionSorter"/>

                    </validation>

                </datasource>

                <drivers>

                    <driver name="h2" module="com.h2database.h2">

                        <xa-datasource-class>org.h2.jdbcx.JdbcDataSource</xa-datasource-class>

                    </driver>

                    <driver name="mysql" module="com.mysql">

                        <driver-class>com.mysql.cj.jdbc.Driver</driver-class>

                        <xa-datasource-class>com.mysql.cj.jdbc.MysqlXADataSource</xa-datasource-class>

                    </driver>

                </drivers>

            </datasources>