DBpedia index is enriched with types beyond its own ontology, but DBpedia lookup just support queries by DBpedia types.

Is useful to the community enables queries of any kind of type that is indexed?

Is there any built index for DBpedia 2016-10?

Thanks.

http://lookup.dbpedia.org/api/search/PrefixSearch?QueryString=test results with 500 internal server error since at least two weeks. Are there any alternatives we can use for prefix search or will this error be fixed?

Caused by: java.lang.NoSuchMethodError: scala.collection.immutable.$colon$colon.hd$1()Ljava/lang/Object; at scala.xml.NamespaceBinding.fromPrefixList$1(NamespaceBinding.scala:48) at scala.xml.NamespaceBinding.shadowRedefined(NamespaceBinding.scala:53) at scala.xml.NamespaceBinding.buildString(NamespaceBinding.scala:71) at scala.xml.Utility$.serialize(Utility.scala:218) at scala.xml.PrettyPrinter.traverse(PrettyPrinter.scala:151) at scala.xml.PrettyPrinter.format(PrettyPrinter.scala:209) at scala.xml.PrettyPrinter$$anonfun$format$2.apply(PrettyPrinter.scala:244) at scala.xml.PrettyPrinter$$anonfun$format$2.apply(PrettyPrinter.scala:244) at scala.xml.Utility$.sbToString(Utility.scala:33) at scala.xml.PrettyPrinter.format(PrettyPrinter.scala:244) at org.dbpedia.lookup.entities.ResultXmlSerializer.prettyPrint(EntitiesSerialization.scala:37) at org.dbpedia.lookup.server.LookupResource.serialize(LookupResource.scala:58) at org.dbpedia.lookup.server.LookupResource.ok(LookupResource.scala:50) at org.dbpedia.lookup.server.LookupResource.keywordSearch(LookupResource.scala:37) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:186) at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:70)

For

• 2016_04 (English)

• 2016_10 (English)

• Create extraction task at jenkins

Hi, I've been using the lookup service for the last few weeks with no issues but since this weekend I keep getting a Service Temporarily Unavailable message from both the Keyword Search & Autocomplete.

I'm assuming the service is going through some maintenance but just wanted to check just in case you guys weren't aware of the issue.

Thanks in advance!

Hi,

I have installed my own copy of DBpedia lookup. Which works fine until I issue the following query:

http://localhost:1111/KeywordSearch?&MaxHits=5&QueryString=Con+Mine+%28includes+Rycon%29

This query causes an HTTP 500 error, and all subsequent queries will be answered with an HTTP 500 error as well (the service eventually recovers after a certain amount of time).

Could someone please have a look into that?

Thanks,
Heiko

The lookup service is no longer working for me. I also tested the example http://lookup.dbpedia.org/api/search/PrefixSearch?QueryClass=&MaxHits=5&QueryString=berl

Thank you,

Failed to execute goal on project dbpedia-lookup: Could not resolve dependencies for project org.dbpedia.lookup:dbpedia-lookup:war:3.1: Could not find artifact org.dbpedia.extraction:core:jar:3.8 in nxparser-repo (http://nxparser.googlecode.com/svn/repository)

I am trying to build an index for Spanish data, but I can't seem to find a way to build refCount information needed to properly sorting the data.

All I found was a page-links_es.nt.bz2 file containing wikiPageWikiLink triples.

DBpedia Lookup currently returns results in XML. We want to keep the same functionality for consistency but also to update to new formats like jsonLD (RDF) and NIF. this will result in breaking the current project in 3 modules, lookup-core, lookup-xml, lookup-rdf.

The goal of the new lookup-rdf module is to match the new Google KG API interface

Hello, I can't build master due to old versions of nxparser no longer being available on google code. Any thoughts?

The jar works perfectly 99.9% of the time, but every now and then it will suddenly throw the following error:

Sep 04, 2017 1:50:12 PM com.sun.jersey.spi.container.ContainerResponse mapMappableContainerException
SEVERE: The exception contained within MappableContainerException could not be mapped to a response, re-throwing to the HTTP container
org.apache.lucene.queryParser.ParseException: Cannot parse '"sta"': Encountered "<EOF>" at line 1, column 0.
Was expecting one of:
    <NOT> ...
    "+" ...
    "-" ...
    <BAREOPER> ...
    "(" ...
    "*" ...
    <QUOTED> ...
    <TERM> ...
    <PREFIXTERM> ...
    <WILDTERM> ...
    "[" ...
    "{" ...
    <NUMBER> ...
    <TERM> ...
    "*" ...

	at org.apache.lucene.queryParser.QueryParser.parse(QueryParser.java:211)
	at org.dbpedia.lookup.lucene.LuceneConfig$PrefixSearchPseudoAnalyzer$.analyze(LuceneConfig.scala:43)
	at org.dbpedia.lookup.lucene.Searcher.getQuery(Searcher.scala:59)
	at org.dbpedia.lookup.lucene.Searcher.prefixSearch(Searcher.scala:39)
	at org.dbpedia.lookup.server.LookupResource.prefixSearch(LookupResource.scala:43)
	at sun.reflect.GeneratedMethodAccessor10.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60)
	at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:205)
	at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)
	at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:302)
	at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
	at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)
	at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
	at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)
	at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1542)
	at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1473)
	at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1419)
	at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1409)
	at com.sun.jersey.server.impl.container.httpserver.HttpHandlerContainer.handle(HttpHandlerContainer.java:191)
	at com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:79)
	at sun.net.httpserver.AuthFilter.doFilter(AuthFilter.java:83)
	at com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:82)
	at sun.net.httpserver.ServerImpl$Exchange$LinkHandler.handle(ServerImpl.java:675)
	at com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:79)
	at sun.net.httpserver.ServerImpl$Exchange.run(ServerImpl.java:647)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.lucene.queryParser.ParseException: Encountered "<EOF>" at line 1, column 0.
Was expecting one of:
    <NOT> ...
    "+" ...
    "-" ...
    <BAREOPER> ...
    "(" ...
    "*" ...
    <QUOTED> ...
    <TERM> ...
    <PREFIXTERM> ...
    <WILDTERM> ...
    "[" ...
    "{" ...
    <NUMBER> ...
    <TERM> ...
    "*" ...

	at org.apache.lucene.queryParser.QueryParser.generateParseException(QueryParser.java:1849)
	at org.apache.lucene.queryParser.QueryParser.jj_consume_token(QueryParser.java:1731)
	at org.apache.lucene.queryParser.QueryParser.Clause(QueryParser.java:1337)
	at org.apache.lucene.queryParser.QueryParser.Query(QueryParser.java:1245)
	at org.apache.lucene.queryParser.QueryParser.TopLevelQuery(QueryParser.java:1234)
	at org.apache.lucene.queryParser.QueryParser.parse(QueryParser.java:206)
	... 29 more

When i visit ："http://lookup.dbpedia.org/api/search/KeywordSearch?QueryString=Dutch", the first answer is http://dbpedia.org/resource/United_States, while i think the correct answer should be "http://dbpedia.org/resource/Netherlands". So i want to know if there are some problems about the recent update?

If the server is started via the run script it seems to try to open a URI with an example search query. While this might make sense during testing this is not really useful in production environment as we neither have an X11 server nor a web browser installed so it ends in an error message.

This should be removed from the default server configuration.

After downloading dbpedia-lookup-index and mvn install "./run Server dbpedia-lookup-index-3.8" doesn't works.It gives following error:

[INFO] --- scala-maven-plugin:3.2.2:testCompile (test-compile) @ dbpedia-lookup ---
[WARNING] Expected all dependencies to require Scala version: 2.11.7
[WARNING] org.dbpedia.lookup:dbpedia-lookup:3.1 requires scala version: 2.11.7
[WARNING] org.scala-lang:scala-compiler:2.11.7 requires scala version: 2.11.7
[WARNING] org.scala-lang:scala-reflect:2.11.7 requires scala version: 2.11.7
[WARNING] org.scala-lang.modules:scala-xml_2.11:1.0.4 requires scala version: 2.11.4
[WARNING] Multiple versions of scala libraries detected!
[INFO] Nothing to compile - all classes are up to date
[INFO]
[INFO] <<< scala-maven-plugin:3.2.2:run (default-cli) < test-compile @ dbpedia-lookup <<<
[INFO]
[INFO] --- scala-maven-plugin:3.2.2:run (default-cli) @ dbpedia-lookup ---
[WARNING] Expected all dependencies to require Scala version: 2.11.7
[WARNING] org.dbpedia.lookup:dbpedia-lookup:3.1 requires scala version: 2.11.7
[WARNING] org.scala-lang:scala-compiler:2.11.7 requires scala version: 2.11.7
[WARNING] org.scala-lang:scala-reflect:2.11.7 requires scala version: 2.11.7
[WARNING] org.scala-lang.modules:scala-xml_2.11:1.0.4 requires scala version: 2.11.4
[WARNING] Multiple versions of scala libraries detected!
[INFO] launcher 'Server' selected => org.dbpedia.lookup.server.Server
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at scala_maven_executions.MainHelper.runMain(MainHelper.java:164)
at scala_maven_executions.MainWithArgsInFile.main(MainWithArgsInFile.java:26)
Caused by: org.apache.lucene.index.IndexNotFoundException: no segments* file found in org.apache.lucene.store.MMapDirectory@/home/abhishek/lookup/dbpedia-lookup-index-3.8 lockFactory=org.apache.lucene.store.NativeFSLockFactory@7a003aca: files: [dbpedia-lookup-index-3.8]
at org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run(SegmentInfos.java:667)
at org.apache.lucene.index.DirectoryReader.open(DirectoryReader.java:72)
at org.apache.lucene.index.IndexReader.open(IndexReader.java:256)
at org.dbpedia.lookup.lucene.Searcher.(Searcher.scala:21)
at org.dbpedia.lookup.server.Server$.main(Server.scala:51)
at org.dbpedia.lookup.server.Server.main(Server.scala)
... 6 more
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 5.877 s
[INFO] Finished at: 2016-02-28T17:10:35+05:30
[INFO] Final Memory: 17M/248M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal net.alchim31.maven:scala-maven-plugin:3.2.2:run (default-cli) on project dbpedia-lookup: wrap: org.apache.commons.exec.ExecuteException: Process exited with an error: 240 (Exit value: 240) -> [Help 1]

I'm trying to re-build the index for my own DBpedia lookup service.
I've encountered the following error after execution the indexer :

Picked up JAVA_TOOL_OPTIONS: -javaagent:/usr/share/java/jayatanaag.jar
[INFO] Scanning for projects...
Downloading: http://repo.maven.apache.org/maven2/org/codehaus/mojo/maven-metadata.xml
Downloading: http://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-metadata.xml
Downloaded: http://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-metadata.xml (13 KB at 15.7 KB/sec)
Downloaded: http://repo.maven.apache.org/maven2/org/codehaus/mojo/maven-metadata.xml (22 KB at 10.6 KB/sec)
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2.912s
[INFO] Finished at: Sat Jun 28 10:37:59 CET 2014
[INFO] Final Memory: 8M/205M
[INFO] ------------------------------------------------------------------------
[ERROR] No plugin found for prefix 'scala' in the current project and in the plugin groups [org.apache.maven.plugins, org.codehaus.mojo] available from the repositories [local (/home/nasreddine/.m2/repository), central (http://repo.maven.apache.org/maven2)] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/NoPluginFoundForPrefixException

I get following error when compiling (mvn clean install).
@sandroacoelho any idea on the cause of this error? Can you maybe try to compile it? Thanks!

Here is the error I get.

[ERROR] error: scala.reflect.internal.MissingRequirementError: object java.lang.Object in compiler mirror not found.
[ERROR] 	at scala.reflect.internal.MissingRequirementError$.signal(MissingRequirementError.scala:17)
[ERROR] 	at scala.reflect.internal.MissingRequirementError$.notFound(MissingRequirementError.scala:18)
[ERROR] 	at scala.reflect.internal.Mirrors$RootsBase.getModuleOrClass(Mirrors.scala:53)
[ERROR] 	at scala.reflect.internal.Mirrors$RootsBase.getModuleOrClass(Mirrors.scala:45)
[ERROR] 	at scala.reflect.internal.Mirrors$RootsBase.getModuleOrClass(Mirrors.scala:45)
[ERROR] 	at scala.reflect.internal.Mirrors$RootsBase.getModuleOrClass(Mirrors.scala:66)
[ERROR] 	at scala.reflect.internal.Mirrors$RootsBase.getClassByName(Mirrors.scala:102)
[ERROR] 	at scala.reflect.internal.Mirrors$RootsBase.getRequiredClass(Mirrors.scala:105)
[ERROR] 	at scala.reflect.internal.Definitions$DefinitionsClass.ObjectClass$lzycompute(Definitions.scala:257)
[ERROR] 	at scala.reflect.internal.Definitions$DefinitionsClass.ObjectClass(Definitions.scala:257)
[ERROR] 	at scala.reflect.internal.Definitions$DefinitionsClass.init(Definitions.scala:1394)
[ERROR] 	at scala.tools.nsc.Global$Run.<init>(Global.scala:1215)
[ERROR] 	at scala.tools.nsc.Driver.doCompile(Driver.scala:31)
[ERROR] 	at scala.tools.nsc.MainClass.doCompile(Main.scala:23)
[ERROR] 	at scala.tools.nsc.Driver.process(Driver.scala:51)
[ERROR] 	at scala.tools.nsc.Driver.main(Driver.scala:64)
[ERROR] 	at scala.tools.nsc.Main.main(Main.scala)
[ERROR] 	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[ERROR] 	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[ERROR] 	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[ERROR] 	at java.base/java.lang.reflect.Method.invoke(Method.java:567)
[ERROR] 	at scala_maven_executions.MainHelper.runMain(MainHelper.java:164)
[ERROR] 	at scala_maven_executions.MainWithArgsInFile.main(MainWithArgsInFile.java:26)
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  1.871 s
[INFO] Finished at: 2020-04-06T16:45:40+02:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal net.alchim31.maven:scala-maven-plugin:3.2.2:compile (compile) on project dbpedia-lookup: wrap: org.apache.commons.exec.ExecuteException: Process exited with an error: 1 (Exit value: 1) -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException

Since a couple of days the public end-point is not working anymore:

http://lookup.dbpedia.org/api/search/PrefixSearch?QueryClass=&MaxHits=5&QueryString=berl

returns a blank page

For now I am not interested in running & maintaining a local instance (in the prototype phase of a project)

I'm using the PrefixSearch API and I just noticed it no longer works. The API always fails with a 500 internal server error.

Ex: http://lookup.dbpedia.org/api/search/PrefixSearch?QueryString=berlin

Hi,

I am getting
org.apache.lucene.index.IndexNotFoundException: no segments* file found

I have used the following script:
https://github.com/dbpedia/lookup/blob/master/scripts/index.sh

sh index.sh 2016-10 en

Thanks

The pairCounts file has 3(three) columns as follow:

• Surface Form;
• URI
• Reference count

When I run ./run Indexer lookup_index_dir redirects_en.ttl pairCounts, DBpedia Lookup must fill the index using URI as key, with all surface forms summing reference count.

Example:

Berlin http://dbpedia.org/resource/Berlin 33909
Europe/Berlin http://dbpedia.org/resource/Berlin 610

Reference count sum: 34519

Index

Hello,

I downloaded image using
docker pull dbpedia/lookup

however when I run server and try to query it using
curl http://localhost:1111/api/search/KeywordSearch?QueryClass=place&QueryString=berlin
I get the following exception

Apr 22, 2016 9:08:11 AM com.sun.jersey.spi.container.ContainerResponse write
SEVERE: A message body writer for Java class java.lang.String, and Java type class java.lang.String, and MIME media type application/xml was not found
Apr 22, 2016 9:08:11 AM com.sun.jersey.spi.container.ContainerResponse write
SEVERE: The registered message body writers compatible with the MIME media type are:
*/* ->
  com.sun.jersey.server.impl.template.ViewableMessageBodyWriter

Apr 22, 2016 9:08:11 AM com.sun.jersey.spi.container.ContainerResponse logException
SEVERE: Mapped exception to response: 500 (Internal Server Error)
javax.ws.rs.WebApplicationException: com.sun.jersey.api.MessageException: A message body writer for Java class java.lang.String, and Java type class java.lang.String, and MIME media type application/xml was not found
        at com.sun.jersey.spi.container.ContainerResponse.write(ContainerResponse.java:285)
        at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1316)
        at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1229)
        at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1219)
        at com.sun.jersey.server.impl.container.httpserver.HttpHandlerContainer.handle(HttpHandlerContainer.java:191)
        at com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:79)
        at sun.net.httpserver.AuthFilter.doFilter(AuthFilter.java:83)
        at com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:82)
        at sun.net.httpserver.ServerImpl$Exchange$LinkHandler.handle(ServerImpl.java:675)
        at com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:79)
        at sun.net.httpserver.ServerImpl$Exchange.run(ServerImpl.java:647)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
Caused by: com.sun.jersey.api.MessageException: A message body writer for Java class java.lang.String, and Java type class java.lang.String, and MIME media type application/xml was not found
        ... 14 more

We are using the DBPedia Lookup online web service and it seems to be down today.

http://lookup.dbpedia.org/api/search.asmx/KeywordSearch?QueryClass=place&QueryString=berlin

I would appreciate if the maintainers of the service could have a look at it and put it back online. Thanks !

Hi, I've been having trouble using the public lookup API programmatically. It appears one of the SSL certificates of domain lookup.dbpedia.org expired 9 days ago. Will this be renewed soon?

Hello everyone,

I am currently rebuilding the index, in order to have the latest data from dbpedia.

I am stuck at the part:
"pignlproc output from nerd-stats.pig"

At first, just to know what it is about, what is this file doing? Can the look-up work without this file?

Then, is the nerd-stats.pig a very intensive script that requires a hadoop cluster of several machines? Or is it ok to run it on a laptop?

Thanks you by advance,
Sam

I try to run the lookup service by using the following command line:

java -cp dbpedia-lookup-3.1-jar-with-dependencies.jar org.dbpedia
.lookup.server.Server dbpedia-lookup-index/en/current/core-i18n

The server starts at the port 1111 and when I send a query I have following error

INFO: Initiating Jersey application, version 'Jersey: 1.5 01/14/2011 12:36 PM'
INFO  - Server started in c:\data\lookup listening on http://localhost:1111/
INFO  - KeywordSearch found 0: MaxHits=5 QueryClass=place QueryString=berlin
Apr 20, 2016 10:59:10 PM com.sun.jersey.spi.container.ContainerResponse write
SEVERE: A message body writer for Java class java.lang.String, and Java type cla
ss java.lang.String, and MIME media type application/xml was not found
Apr 20, 2016 10:59:10 PM com.sun.jersey.spi.container.ContainerResponse write
SEVERE: The registered message body writers compatible with the MIME media type
are:
*/* ->
  com.sun.jersey.server.impl.template.ViewableMessageBodyWriter

Apr 20, 2016 10:59:10 PM com.sun.jersey.spi.container.ContainerResponse logExcep
tion
SEVERE: Mapped exception to response: 500 (Internal Server Error)
javax.ws.rs.WebApplicationException: com.sun.jersey.api.MessageException: A mess
age body writer for Java class java.lang.String, and Java type class java.lang.S
tring, and MIME media type application/xml was not found
        at com.sun.jersey.spi.container.ContainerResponse.write(ContainerRespons
e.java:285)
        at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequ
est(WebApplicationImpl.java:1316)
        at com.sun.jersey.server.impl.application.WebApplicationImpl.handleReque
st(WebApplicationImpl.java:1229)
        at com.sun.jersey.server.impl.application.WebApplicationImpl.handleReque
st(WebApplicationImpl.java:1219)
        at com.sun.jersey.server.impl.container.httpserver.HttpHandlerContainer.
handle(HttpHandlerContainer.java:191)
        at com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:79)
        at sun.net.httpserver.AuthFilter.doFilter(AuthFilter.java:83)
        at com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:82)
        at sun.net.httpserver.ServerImpl$Exchange$LinkHandler.handle(ServerImpl.
java:675)
        at com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:79)
        at sun.net.httpserver.ServerImpl$Exchange.run(ServerImpl.java:647)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.
java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor
.java:617)
        at java.lang.Thread.run(Thread.java:745)
Caused by: com.sun.jersey.api.MessageException: A message body writer for Java c
lass java.lang.String, and Java type class java.lang.String, and MIME media type
 application/xml was not found
        ... 14 more

When running the same program using the shell script run.bat, the service behaves normally. I suspect that the uberjar file is not properly formed (resources describing message body writers are not set properly in the jar file?)

I am using the code for the lookup-service but it seems that it returns an empty result set even for cases it should return results e.g. http://lookup.dbpedia.org/api/search.asmx/KeywordSearch?QueryString=photography
I noticed that in the line sax.parse(ins,this) keeps giving me zero.
Nevertheless, I am not sure how I should use the methods startelement(), endlement() etc. Could you please help me to figure tout what is happening and how should I use the abovementioned methods?

Thank you in advance.

Does lookup service support semantic matchmaking of concepts ?

I try to figure out how to start the server without maven, as maven is not really useful in a headless server environment with a service management framework for starting/stopping the process.

The current run script does not really help as it just triggers maven and I couldn't figure out how to launch it manually.

I tried multiple things, for example:

java  -Xmx512m -Dlogback.configurationFile=logback.xml -Dhttp.port=1111 -jar target/dbpedia-lookup-3.1.jar  org.dbpedia.lookup.server.Server

But it complains about missing main manifest and does not seem to execute org.dbpedia.lookup.server.Server:

no main manifest attribute, in target/dbpedia-lookup-3.1.jar

I'm not sure if it's the right place to report,
because it is a problem on lookup.dbpedia.org deployed service, probably not on source code.

wget 'https://lookup.dbpedia.org/api/search/PrefixSearch?MaxHits=15&QueryClass=&QueryString=soil'
--2017-09-28 12:08:23--  https://lookup.dbpedia.org/api/search/PrefixSearch?MaxHits=15&QueryClass=&QueryString=soil
Résolution de lookup.dbpedia.org (lookup.dbpedia.org)… 134.155.95.15
Connexion à lookup.dbpedia.org (lookup.dbpedia.org)|134.155.95.15|:443… 

After all, it's a semantic web project !

To distinguish betwen the actual URI matches and other URI's,
the actual URI match could be typed lookup:Result , like this :

dbpedia:Berlin a lookup:Result ;
rdfs:label "Berlin" ;
dbo:abstract """
Berlin is the capital city of Germany and one of the 16 states of Germany. 
With a population of 3.5 million people, Berlin is Germany's largest city and is the second most 
populous city proper and the eighth most populous urban area in the European Union. 
Located in northeastern Germany, it is the center of the Berlin-Brandenburg Metropolitan Region, 
which has 5.9 million residents from over 190 nations. Located in the European Plains, 
Berlin is influenced by a temperate seasonal climate.
""" ;
a dbo:Settlement .
 dbo:Settlement rdfs:label "settlement"@en .
# etc ....

Compare both requests :
http://lookup.dbpedia.org/api/search/PrefixSearch?QueryString=Bordea
==> OK !

http://lookup.dbpedia.org/api/search/PrefixSearch?QueryString=Bordea&QueryClass=SpatialThing
==> empty result !

If you are curious, my use case is the following in https://github.com/jmvanel/semantic_forms :

• from the rdfs:range of foaf:based_near ( that is geo:SpatialThing ) an input field is generated with dpPedia completion
• after user typed "Bordea" , the above request is sent by JavaScript

NOTE : that works:
http://lookup.dbpedia.org/api/search/PrefixSearch?QueryString=Bordea&QueryClass=Place

Hi there,

We are using the DBPedia Lookup online web service and it seems to be down:
http://lookup.dbpedia.org/api/search.asmx/KeywordSearch?QueryClass=place&QueryString=Amsterdam

I would appreciate if you could take look and get it back online.

Thanks!

I tried changing the Scala version in the POM file, to no avail.

I tried building the master branch with Java 8 - worked until the end, with a "error: File name too long" error.

I understand that this is probably a low priority thing to fix, since people installing Java 7 is a good option.

EDIT: building master branch of the required extraction-framework works fine if I use an external non-encrypted drive and Java 8. Apparently having my home drive on Ubuntu encrypted caused the long file name error. I still can't build lookup: nxparser not found.

I'm new at dbpedia lookup, my local server doesn't seems to run.

Launching the following command ./run Server ./2015-10/ display the following output : https://pastebin.com/raw/2tQQZQi6

Accessing to http://localhost:1111/ leads to a 404 page.
I've tried to run on another port (9999 for example) as suggested by https://www.mail-archive.com/[email protected]/msg03409.html but this doesn't solve my problem.

Trying the docker image leads to the same result :
docker run -p 1111:1111 -it dbpedia/lookup java -jar /opt/lookup/dbpedia-lookup-3.1-jar-with-dependencies.jar /opt/lookup/2015-10/
Mar 02, 2018 4:18:10 PM com.sun.jersey.server.impl.application.WebApplicationImpl _initiate INFO: Initiating Jersey application, version 'Jersey: 1.19.1 03/11/2016 02:42 PM' INFO - Server started in / listening on http://localhost:1111/
The page at localhost:1111 leads to 404.
I'm running Java 8, Scala 2.11.7, Docker 17.12.1-ce and Debian 9.1

Hi, when I execute the query:

http://localhost:1111/api/search/KeywordSearch?QueryClass=&QueryString=berlin

in my localhost, I get different results than those on the public server, as shown below (only the URIs of the results are shown here for easier reading).
Is it an issue of different versions? Which one is running on the public server?

  <URI>http://dbpedia.org/resource/Dada</URI>
  <URI>http://dbpedia.org/resource/Central_European_Time</URI>
  <URI>http://dbpedia.org/resource/Kingdom_of_Prussia</URI>
  <URI>http://dbpedia.org/resource/Golden_Bear</URI>
  <URI>http://dbpedia.org/resource/Spandau</URI>

The following query gives a 500 error.
http://lookup.dbpedia.org/api/search/PrefixSearch?MaxHits=5&QueryString=banana

Keyword search seems to work.

I try to understand the docker image for lookup. The Dockerfile itself is already confusing me as it looks like there is no command executed when the container is started, it stops with a rm command and no service executed.

When I tried building it on my own and executed a shell I cannot execute the jar:

admin@myhost:~/lookup/docker$ docker run -ti -p 1111:1111 lookup /bin/bash
root@6c79e06c73de:/# cd /opt/lookup/
root@6c79e06c73de:/opt/lookup# ls
2015-04  dbpedia-lookup-3.1-jar-with-dependencies.jar
root@6c79e06c73de:/opt/lookup# java -jar dbpedia-lookup-3.1-jar-with-dependencies.jar
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0
        at org.dbpedia.lookup.server.Server$.main(Server.scala:48)
        at org.dbpedia.lookup.server.Server.main(Server.scala)

My expectation is that with the docker image I get a lookup service on port 1111 exposed and I can use this to query. Am I missing something here?

I successfully mirrorred the web service locally. However, the Refcountis always 0, so the results are not properly sorted, as in the hosted version.

EDIT: I realized now that the field description is also always coming null.

I downloaded the index from the link in README and I'm executing the following command:
mvn scala:run "-Dlauncher=Server" "-DaddArgs=dbpedia-lookup-index/en/2015-04/core-i18n"

Do the previously built indexes contain the redirects included? Or am I missing something?

@Kunal-Jha says: "For some reasons the lookup is not returning results for Spanish language. I was under the impression that I am not entering the keywords correct and the results is returning null. Also according to a recent conversations, I came to know that we have the same problem for the Portugese index too"

I tried to get resources correspond to "Programmer", I got :
http://dbpedia.org/resource/B_movie
http://dbpedia.org/resource/Computer_programming
...

http://dbpedia.org/resource/Programmer exists in DBpedia, but wasn't returned.

Any explanation, please ?

Hey guys,

I am using this service and loves the ability it gives my application but it seems like PrefixSearch is down and has been last 7 days, I was wondering who maintains that on the actual dbpedia servers? Is it actively maintained?

Thanks and sorry if it has been asked before

Jason

I have not been getting a response from this web service. I'm getting ERR_CONNECTION_TIMED_OUT.

For your reference:
http://lookup.dbpedia.org/api/search/PrefixSearch?QueryClass=&MaxHits=5&QueryString=berl

The advertised demo link for PrefixSearch does not work:

http://lookup.dbpedia.org/api/search/PrefixSearch?QueryClass=&MaxHits=5&QueryString=berl

The link http://downloads.dbpedia-spotlight.org/dbpedia_lookup/ does not resolve.

@boyarintsev asked:

I will appreciate a lot if you could answer one more question. Is there a way to obtain some measure of how the system is sure in the result provided. For instance, us -> United States of America (95%)