The GlassFish artifacts in Maven Central either don't contain sources and javadoc artifacts or they contain them, but without any relevant content.

GlassFish Full 7.0.0: https://repo1.maven.org/maven2/org/glassfish/main/distributions/glassfish/7.0.0/

• contains sources JAR, but it's empty, no sources there
• javadoc JAR is missing

GlassFish Web 7.0.0: https://repo1.maven.org/maven2/org/glassfish/main/distributions/web/7.0.0/

• same as Full - sources JAR is empty, no javadoc JAR

GlassFish Embedded All: https://repo1.maven.org/maven2/org/glassfish/main/extras/glassfish-embedded-all/7.0.0/

• contains sources and javadoc JARs, but both are empty

GlassFish Embedded Web: https://repo1.maven.org/maven2/org/glassfish/main/extras/glassfish-embedded-web/7.0.0/

• same as Embedded All, contains sources and javadoc JARs, but both are empty

This means that no Javadoc is available at javadoc.io, e.g. https://javadoc.io/doc/org.glassfish.main.extras/glassfish-embedded-all
Also, no sources can be downloaded by IDEs from Maven.