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Posted to dev@jena.apache.org by "Andy Seaborne (JIRA)" <ji...@apache.org> on 2016/01/14 12:51:39 UTC
[jira] [Commented] (JENA-1116) Does Jena 2.7.x support compressed
chunked results from SPARQL endpoints
[ https://issues.apache.org/jira/browse/JENA-1116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15098018#comment-15098018 ]
Andy Seaborne commented on JENA-1116:
-------------------------------------
Jena 2.7.x is old. The last one was in 2012. This area has changed and now uses Apache HttpClient.
Please try the current released version 3.0.1 and let use know the situation.
(I sorted out the description - this JIRA project supports formatting)
> Does Jena 2.7.x support compressed chunked results from SPARQL endpoints
> -------------------------------------------------------------------------
>
> Key: JENA-1116
> URL: https://issues.apache.org/jira/browse/JENA-1116
> Project: Apache Jena
> Issue Type: Question
> Components: Jena
> Affects Versions: Jena 2.7.4
> Environment: Any ...
> Reporter: Hugh Williams
> Priority: Minor
>
> Consider the following sample code:
> {noformat}
> $ cat VirtuosoTestMalformedInput.java
> import com.hp.hpl.jena.sparql.engine.http.QueryEngineHTTP;
> /**
> * Created by kosterar on 2015-11-25.
> */
> public class VirtuosoTestMalformedInput {
> public static final String SPARQL_ENDPOINT =
> "http://demo.openlinksw.com/sparql";
> public static final String QUERY = "SELECT ?p where { <${s}> ?p ?o.}";
> public static void main(String... args) {
> test();
> }
> public static void test() {
> final QueryEngineHTTP queryEngine = new
> QueryEngineHTTP(SPARQL_ENDPOINT, QUERY);
> queryEngine.execSelect();
> }
> }
> $
> {noformat}
> Which queries a Virtuoso SPARQL endpoint with a deliberate bad query, expected to return a Virtuoso error. The Virtuoso SPARQL endpoint sends results in compressed (gzipped) chunks by default (EnabledGzipContent = 1 set in the HTTP Server section of the Virtuoso config file by default).
> When the above query is run one expects the error "SP030 SPARQL compiler, line 0: Bad character '$' (0x24)
> in SPARQL expression at '$'" to be returned:
> {noformat}
> $ curl -g -H 'Accept:
> application/json'
> 'http://demo.openinksw.com/sparql?query=SELECT%20%3Fp%20where%20%7B%20%3C%24%7Bs%7D%3E%20%3Fp%20%3Fo.%7D'
> Virtuoso 37000 Error SP030: SPARQL compiler, line 0: Bad character '$' (0x24)
> in SPARQL expression at '$'
> SPARQL query:
> define sql:big-data-const 0 SELECT ?p where { <${s}> ?p ?o.}
> $
> {noformat}
> but instead Jena gives the error:
> {noformat}
> $ javac -classpath
> ".:../apache-jena-2.7.4/lib/commons-codec-1.5.jar:../apache-jena-2.7.4/lib/httpclient-4.1.2.jar:../apache-jena-2.7.4/lib/httpcore-4.1.3.jar:../apache-jena-2.7.4/lib/jcl-over-slf4j-1.6.4.jar:../apache-jena-2.7.4/lib/jena-arq-2.9.4.jar:../apache-jena-2.7.4/lib/jena-core-2.7.4.jar:../apache-jena-2.7.4/lib/jena-iri-0.9.4.jar:../apache-jena-2.7.4/lib/jena-tdb-0.9.4.jar:../apache-jena-2.7.4/lib/log4j-1.2.16.jar:../apache-jena-2.7.4/lib/slf4j-api-1.6.4.jar:../apache-jena-2.7.4/lib/slf4j-log4j12-1.6.4.jar:../apache-jena-2.7.4/lib/xercesImpl-2.10.0.jar:../apache-jena-2.7.4/lib/xml-apis-1.4.01.jar"
> VirtuosoTestMalformedInput.java
> $ java -classpath
> ".:../apache-jena-2.7.4/lib/commons-codec-1.5.jar:../apache-jena-2.7.4/lib/httpclient-4.1.2.jar:../apache-jena-2.7.4/lib/httpcore-4.1.3.jar:../apache-jena-2.7.4/lib/jcl-over-slf4j-1.6.4.jar:../apache-jena-2.7.4/lib/jena-arq-2.9.4.jar:../apache-jena-2.7.4/lib/jena-core-2.7.4.jar:../apache-jena-2.7.4/lib/jena-iri-0.9.4.jar:../apache-jena-2.7.4/lib/jena-tdb-0.9.4.jar:../apache-jena-2.7.4/lib/log4j-1.2.16.jar:../apache-jena-2.7.4/lib/slf4j-api-1.6.4.jar:../apache-jena-2.7.4/lib/slf4j-log4j12-1.6.4.jar:../apache-jena-2.7.4/lib/xercesImpl-2.10.0.jar:../apache-jena-2.7.4/lib/xml-apis-1.4.01.jar"
> VirtuosoTestMalformedInput
> log4j:WARN No appenders could be found for logger
> (com.hp.hpl.jena.sparql.mgt.ARQMgt).
> log4j:WARN Please initialize the log4j system properly.
> Exception in thread "main" HttpException:
> java.nio.charset.MalformedInputException: Input length = 1:
> java.nio.charset.MalformedInputException: Input length = 1
> at
> com.hp.hpl.jena.sparql.engine.http.HttpQuery.execCommon(HttpQuery.java:520)
> at
> com.hp.hpl.jena.sparql.engine.http.HttpQuery.execGet(HttpQuery.java:289)
> at
> com.hp.hpl.jena.sparql.engine.http.HttpQuery.exec(HttpQuery.java:240)
> at
> com.hp.hpl.jena.sparql.engine.http.QueryEngineHTTP.execSelect(QueryEngineHTTP.java:213)
> at VirtuosoTestMalformedInput.test(VirtuosoTestMalformedInput.java:21)
> at VirtuosoTestMalformedInput.main(VirtuosoTestMalformedInput.java:15)
> Caused by: java.nio.charset.MalformedInputException: Input length = 1
> at java.nio.charset.CoderResult.throwException(CoderResult.java:281)
> at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:339)
> at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:178)
> at java.io.InputStreamReader.read(InputStreamReader.java:184)
> at java.io.BufferedReader.read1(BufferedReader.java:210)
> at java.io.BufferedReader.read(BufferedReader.java:286)
> at java.io.Reader.read(Reader.java:140)
> at
> com.hp.hpl.jena.util.FileUtils.readWholeFileAsUTF8(FileUtils.java:460)
> at
> com.hp.hpl.jena.util.FileUtils.readWholeFileAsUTF8(FileUtils.java:444)
> at
> com.hp.hpl.jena.sparql.engine.http.HttpQuery.execCommon(HttpQuery.java:433)
> ... 5 more
> $
> {noformat}
> Whereas if I set EnabledGzipContent = 0 set in Virtuoso INI file the expected error is returned:
> {noformat}
> $ java -classpath
> ".:../apache-jena-2.7.4/lib/commons-codec-1.5.jar:../apache-jena-2.7.4/lib/httpclient-4.1.2.jar:../apache-jena-2.7.4/lib/httpcore-4.1.3.jar:../apache-jena-2.7.4/lib/jcl-over-slf4j-1.6.4.jar:../apache-jena-2.7.4/lib/jena-arq-2.9.4.jar:../apache-jena-2.7.4/lib/jena-core-2.7.4.jar:../apache-jena-2.7.4/lib/jena-iri-0.9.4.jar:../apache-jena-2.7.4/lib/jena-tdb-0.9.4.jar:../apache-jena-2.7.4/lib/log4j-1.2.16.jar:../apache-jena-2.7.4/lib/slf4j-api-1.6.4.jar:../apache-jena-2.7.4/lib/slf4j-log4j12-1.6.4.jar:../apache-jena-2.7.4/lib/xercesImpl-2.10.0.jar:../apache-jena-2.7.4/lib/xml-apis-1.4.01.jar"
> VirtuosoTestMalformedInput
> log4j:WARN No appenders could be found for logger
> (com.hp.hpl.jena.sparql.mgt.ARQMgt).
> log4j:WARN Please initialize the log4j system properly.
> Exception in thread "main" HttpException: 400 Bad Request
> Virtuoso 37000 Error SP030: SPARQL compiler, line 0: Bad character '$' (0x24)
> in SPARQL expression at '$'
> SPARQL query:
> SELECT ?p where { <${s}> ?p ?o.}
> at
> com.hp.hpl.jena.sparql.engine.http.HttpQuery.execCommon(HttpQuery.java:434)
> at
> com.hp.hpl.jena.sparql.engine.http.HttpQuery.execGet(HttpQuery.java:289)
> at
> com.hp.hpl.jena.sparql.engine.http.HttpQuery.exec(HttpQuery.java:240)
> at
> com.hp.hpl.jena.sparql.engine.http.QueryEngineHTTP.execSelect(QueryEngineHTTP.java:213)
> at VirtuosoTestMalformedInput.test(VirtuosoTestMalformedInput.java:21)
> at VirtuosoTestMalformedInput.main(VirtuosoTestMalformedInput.java:15)
> $
> {noformat}
> Hence the question as to whether Jena 2.7x supports compressed chunked data or is this possibly a bug ?
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