bvosburgh-tq opened a new pull request #1147:
URL: https://github.com/apache/jena/pull/1147
... so it executes after static fields are initialized
Since this not easy to test without starting a new JVM, a simple program
demonstrates the problem:
```
import org.apache.jena.riot.RDFFormat;
import org.apache.jena.riot.RDFWriterRegistry;
import org.apache.jena.riot.WriterGraphRIOTFactory;
public class TestRDFWriterRegistry {
public static void main(String[] args) {
RDFWriterRegistry.register((RDFFormat) null,
(WriterGraphRIOTFactory) null);
System.out.println("done");
}
}
```
Running the program will result in this exception:
```
Exception in thread "main" java.lang.ExceptionInInitializerError
at TestRDFWriterRegistry.main(TestRDFWriterRegistry.java:27)
Caused by: java.lang.NullPointerException: Cannot invoke
"java.util.Map.put(Object, Object)" because
"org.apache.jena.riot.RDFWriterRegistry.registryGraph" is null
at
org.apache.jena.riot.RDFWriterRegistry.register(RDFWriterRegistry.java:224)
at org.apache.jena.riot.system.SysJSONLD11.init(SysJSONLD11.java:62)
at org.apache.jena.riot.RIOT.init(RIOT.java:84)
at org.apache.jena.riot.system.InitRIOT.start(InitRIOT.java:29)
at
org.apache.jena.base.module.Subsystem.lambda$initialize$2(Subsystem.java:117)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
at org.apache.jena.base.module.Subsystem.forEach(Subsystem.java:193)
at org.apache.jena.base.module.Subsystem.forEach(Subsystem.java:169)
at org.apache.jena.base.module.Subsystem.initialize(Subsystem.java:115)
at org.apache.jena.sys.JenaSystem.init(JenaSystem.java:88)
at
org.apache.jena.riot.RDFWriterRegistry.<clinit>(RDFWriterRegistry.java:48)
... 1 more
```
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