Github user ansell commented on a diff in the pull request: https://github.com/apache/commons-rdf/pull/43#discussion_r151267617 --- Diff: commons-rdf-simple/src/main/java/org/apache/commons/rdf/simple/experimental/AbstractRDFParser.java --- @@ -200,19 +200,19 @@ * been set */ public Optional<IRI> getSourceIri() { - return sourceIri; + return Optional.ofNullable(sourceIri); } - private Optional<RDF> rdfTermFactory = Optional.empty(); - private Optional<RDFSyntax> contentTypeSyntax = Optional.empty(); - private Optional<String> contentType = Optional.empty(); - private Optional<IRI> base = Optional.empty(); - private Optional<InputStream> sourceInputStream = Optional.empty(); - private Optional<Path> sourceFile = Optional.empty(); - private Optional<IRI> sourceIri = Optional.empty(); + private RDF rdfTermFactory = null; + private RDFSyntax contentTypeSyntax = null; + private String contentType = null; + private IRI base = null; + private InputStream sourceInputStream = null; --- End diff -- This may be a sticking point for actually enabling ``Serializable``, but the changes to not use optional field values look good to me.
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