arne-bdt commented on issue #2787:
URL: https://github.com/apache/jena/issues/2787#issuecomment-2436036138
> It is difficult to test for because Jena is likely initlialized and any
test will pass for that reason -- it isn't a test of class initialization order
and we can not rely on the test.
>
> If this is run from `public static void main`, and there is no
`JenaSystem.ini`t call in `RDFLinkHTTPBuilder`, it should go wrong.
>
> ```java
> public static void mainNPE2675() {
> System.out.println("GH-2675: RDFLinkHTTP NPE");
> try (RDFConnection conn =
RDFConnectionFuseki.service("http://localhost:3030/ds";).build()) {
>
> }
> System.out.println("DONE");
> }
> ```
Great: It runs perfectly. But when `static { JenaSystem.init(); }` is
removed in RDFLinkHTTPBuilder, it fails with:
`java.lang.ExceptionInInitializerError ... Caused by:
java.lang.NullPointerException: Cannot invoke
"org.apache.jena.rdf.model.Resource.asNode()" because
"org.apache.jena.vocabulary.RDF.Alt" is null`
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