Currently, the "DiscoverJpaConfigurationXmlRuleProvider" rule searches only for the "http://java.sun.com/xml/ns/persistence" namespace [0].
As stated in [1]

Starting with the 2.1 version, the Java Persistence API Schemas share the namespace, http://xmlns.jcp.org/xml/ns/persistence/. Previous versions used the namespace http://java.sun.com/xml/ns/persistence/

Lately, with Jakarta EE, the "https://jakarta.ee/xml/ns/persistence" namespace has been added as well.

So namespace's URIs:

• http://xmlns.jcp.org/xml/ns/persistence
• https://jakarta.ee/xml/ns/persistence

must be added to that rule's when condition.

[0] https://github.com/windup/windup/blob/72135fa04aa7a70b80ab38cfc9b9e6e1de4d4842/rules-java-ee/addon/src/main/java/org/jboss/windup/rules/apps/javaee/rules/DiscoverJpaConfigurationXmlRuleProvider.java
[1] http://www.oracle.com/webfolder/technetwork/jsc/xml/ns/persistence/index.html#1.0