NetBeans Java EE module: Jakarta EE 9 namespace support unresolved

Direct answer

Apache NetBeans 12.0 (released June 2020) and later versions include Jakarta EE 9 jakarta.* namespace recognition in the Java EE module (nb-javase-ee). The module parses jakarta.* annotations for code completion, navigation, and validation. NetBeans 11.x and earlier do not recognize jakarta.* at all.

Confirmed facts

• Version threshold: NetBeans ≥ 12.0 is required. Verify via Help → About.
• Module availability: The Java EE Base module is bundled in the "Java Web and EE" distribution; in the "Java SE" distribution it must be enabled via Tools → Plugins → Installed.
• Server runtime: Project Properties → Run must point to a Jakarta EE 9+ compliant server (GlassFish 6+, Payara 5.2021+, WildFly 24+, etc.). The IDE uses the server's implementation JARs to drive namespace hints.
• Build‑tool detection: Maven or Gradle projects automatically pick up jakarta.* when jakarta.platform:jakarta.jakartaee-api:9.0.0 (or later) is on the compile classpath.
• Templates: File → New Project → Jakarta EE → Web Application generates classes with jakarta.* imports and deployment descriptors referencing version 9.0+ XSDs.
• Coexistence: Legacy javax.* projects continue to work; the module distinguishes namespaces by target server runtime and classpath contents.

Steps to enable Jakarta EE 9 in an existing project

1. Confirm NetBeans version ≥ 12.0 (Help → About).
2. Ensure the Java EE Base plugin is enabled (Tools → Plugins → Installed).
3. Open Project Properties → Libraries → Compile and add jakarta.platform:jakarta.jakartaee-api:9.0.0 (or newer) if missing.
4. In Project Properties → Run, select a Jakarta EE 9+ server runtime.
5. Test: type @jakarta.persistence.Entity in a Java class; code completion should propose the annotation and its attributes.

Open verification item

Please provide your exact NetBeans version and distribution (e.g., "Java Web and EE" or "Java SE") so I can confirm that the Java EE module is present and rule out a missing plugin or older release.