[JENA-1841] Side Effect of Datatype <java:java.util.UUID> Use in Query

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Jena 3.14.0
• Fix Version/s: Jena 3.15.0
• Assignee: Claude Warren
• Reporter: Jan Martin Keil
• Created: 17/Feb/20 08:32
• Updated: 19/May/20 10:26
• Resolved: 19/Mar/20 09:39

Description

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.

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");
	}
}

Issue Links

• links to: GitHub Pull Request #704