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https://issues.apache.org/jira/browse/JENA-1841?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17051108#comment-17051108
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Andy Seaborne commented on JENA-1841:
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[~claude] -- {{createLiteral( o.toString() )}} makes it an {{xsd:string}} which
is not what {{o}} is. It will not match {{"..."^^<java:java.util.UUID>}} later
nor be able to reconstruct the value on parsing. Needs a datatype URI and a
function string->java object.
In the {{AbstractQueryBuilder.makeNode(Object)}} there simply isn't enough
information to available to construct a complete RDFDatatype. No (RDF)
datatype URI has been provided.
So I think {{AbstractQueryBuilder.makeNode(Object)}} should be defensive and
raise an exception. Better that than setting the global TypeMapper in a way
that does not work later. Changing {{LiteralLabel }} constructor looks risky
(it's very deep in the system) and the error message is worse.
The datatype is the two way mapping between RDF representation of the literal
and the Java object representation. ({{AdHocDatatype}} does not know the
parsing of lexical form to value. {{BaseDatatype}} does not know the java class
for an unknown datatype, nor the way to parse the lexical form. Each is
incomplete for general use.)
[~jmkeil] -- putting in a registration step will work for you? This seems like
the correct way. The rest of this discussion is about how to create the error
case of no registration.
> Side Effect of Datatype <java:java.util.UUID> Use in Query
> ----------------------------------------------------------
>
> Key: JENA-1841
> URL: https://issues.apache.org/jira/browse/JENA-1841
> Project: Apache Jena
> Issue Type: Bug
> Affects Versions: Jena 3.14.0
> Reporter: Jan Martin Keil
> Priority: Major
>
> I faced a bug caused by a side effect of using the datatype
> <java:java.util.UUID> in a query.
> Short story is that you can not use this datatype in model parsing or queries
> after you once used it in a query.
> I did not completely break it down to a specific piece of code, but I wrote
> some testcases that narrow down the issue. Please note that the order of
> execution of the test methods effect the result. So please first try to
> execute single test methods before executing the whole test class.
> {code:java}
> import java.io.ByteArrayInputStream;
> import java.util.UUID;
> import org.apache.jena.arq.querybuilder.SelectBuilder;
> import org.apache.jena.query.QueryExecution;
> import org.apache.jena.query.QueryExecutionFactory;
> import org.apache.jena.rdf.model.Model;
> import org.apache.jena.rdf.model.ModelFactory;
> import org.junit.jupiter.api.Test;
> public class UuidParsingintoModelOrQuery {
> @Test
> public void uuidParsingIntoSingleModel() throws Exception {
> UUID uuid1 =
> UUID.fromString("00000000-0000-0000-0000-000000000000");
> UUID uuid2 =
> UUID.fromString("00000000-0000-0000-0000-000000000001");
> String modelStr = "_:a <http://example.org/p1> \"" + uuid1 +
> "\"^^<java:java.util.UUID> .\n"
> + "_:a <http://example.org/p2> \"" + uuid1 +
> "\"^^<java:java.util.UUID> .";
> ModelFactory.createDefaultModel().read(new
> ByteArrayInputStream(modelStr.getBytes()), "", "N-TRIPLE");
> // repeat
> modelStr = "_:a <http://example.org/p1> \"" + uuid2 +
> "\"^^<java:java.util.UUID> .\n"
> + "_:a <http://example.org/p2> \"" + uuid2 +
> "\"^^<java:java.util.UUID> .";
> ModelFactory.createDefaultModel().read(new
> ByteArrayInputStream(modelStr.getBytes()), "", "N-TRIPLE");
> }
> @Test
> public void sameUuidParsingIntoSingleModel() throws Exception {
> UUID uuid1 =
> UUID.fromString("00000000-0000-0000-0000-000000000002");
> UUID uuid2 =
> UUID.fromString("00000000-0000-0000-0000-000000000003");
> String modelStr = "_:a <http://example.org/p1> \"" + uuid1 +
> "\"^^<java:java.util.UUID> .\n"
> + "_:a <http://example.org/p2> \"" + uuid2 +
> "\"^^<java:java.util.UUID> .";
> ModelFactory.createDefaultModel().read(new
> ByteArrayInputStream(modelStr.getBytes()), "", "N-TRIPLE");
> // repeat
> ModelFactory.createDefaultModel().read(new
> ByteArrayInputStream(modelStr.getBytes()), "", "N-TRIPLE");
> }
> @Test
> public void sameUuidParsingIntoMultipleModel() throws Exception {
> UUID uuid =
> UUID.fromString("00000000-0000-0000-0000-000000000004");
> String modelStr = "_:a <http://example.org/p1> \"" + uuid +
> "\"^^<java:java.util.UUID> .";
> ModelFactory.createDefaultModel().read(new
> ByteArrayInputStream(modelStr.getBytes()), "", "N-TRIPLE");
> ModelFactory.createDefaultModel().read(new
> ByteArrayInputStream(modelStr.getBytes()), "", "N-TRIPLE");
> }
> @Test
> public void uuidUseInQuery() throws Exception {
> UUID uuid =
> UUID.fromString("00000000-0000-0000-0000-000000000005");
> SelectBuilder select = new SelectBuilder();
> select.addWhere("?a", "<http://example.org/p>", "?uuid");
> select.addFilter(select.getExprFactory().eq("?uuid", uuid));
> QueryExecution q = QueryExecutionFactory.create(select.build());
> }
> @Test
> public void uuidParsingIntoQuery() throws Exception {
> UUID uuid =
> UUID.fromString("00000000-0000-0000-0000-000000000006");
> SelectBuilder select = new SelectBuilder();
> select.addWhere("?a", "<http://example.org/p>", "?uuid");
> select.addFilter(select.getExprFactory().eq("?uuid", uuid));
> QueryExecution q =
> QueryExecutionFactory.create(select.toString());
> }
> @Test
> public void uuidUseInQueryAndParsingIntoModel() throws Exception {
> UUID uuid =
> UUID.fromString("00000000-0000-0000-0000-000000000007");
> SelectBuilder select = new SelectBuilder();
> select.addWhere("?a", "<http://example.org/p>", "?uuid");
> select.addFilter(select.getExprFactory().eq("?uuid", uuid));
> QueryExecution q = QueryExecutionFactory.create(select.build());
> String modelStr = "_:a <http://example.org/p1> \"" + uuid +
> "\"^^<java:java.util.UUID> .\n"
> + "_:a <http://example.org/p2> \"" + uuid +
> "\"^^<java:java.util.UUID> .";
> Model model = ModelFactory.createDefaultModel().read(new
> ByteArrayInputStream(modelStr.getBytes()), "",
> "N-TRIPLE");
> }
> }
> {code}
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