I am getting the error
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/xerces/util/XMLChar
at org.apache.jena.shared.impl.PrefixMappingImpl.checkLegal(PrefixMappingImpl.java:172)
when running a simple Jena example, but I do have these two dependencies in my Maven pom.xml file:
<dependency>
<groupId>org.apache.jena</groupId>
<artifactId>apache-jena-libs</artifactId>
<type>pom</type>
<version>3.6.0</version>
</dependency>
<dependency>
<groupId>xerces</groupId>
<artifactId>xercesImpl</artifactId>
<version>2.11.0</version>
</dependency>
I checked the downloadable Jena archive and its lib directory does contain the Xerces 2.11.0 jar file, so the version is correct.
What is missing here?
Updates:
AndyS points out the dependency is not needed and that NoClassDefFoundError is different from the more common ClassNotFoundException.
The error happens without the dependency. As for NoClassDefFoundError, not sure what may be causing it. My code is extremely simple:
String filename = "test.jsonld";
Model model = ModelFactory.createDefaultModel() ;
model.read(filename) ;
with test.jsonld being
{
"@id": "http://store.example.com/",
"@type": "Store",
"name": "Links Bike Shop",
"description": "The most \"linked\" bike store on earth!"
}
The full output including exceptions is below. I am not sure how to start troubleshooting this, any suggestions?
12:46:26,102 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Could NOT find resource [logback.groovy]
12:46:26,102 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Could NOT find resource [logback-test.xml]
12:46:26,102 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Found resource [logback.xml] at [file:/C:/Users/E26638/git/aic-praise/target/classes/logback.xml]
12:46:26,103 |-WARN in ch.qos.logback.classic.LoggerContext[default] - Resource [logback.xml] occurs multiple times on the classpath.
12:46:26,104 |-WARN in ch.qos.logback.classic.LoggerContext[default] - Resource [logback.xml] occurs at [file:/C:/Users/E26638/git/aic-expresso/target/classes/logback.xml]
12:46:26,104 |-WARN in ch.qos.logback.classic.LoggerContext[default] - Resource [logback.xml] occurs at [file:/C:/Users/E26638/git/aic-praise/target/classes/logback.xml]
12:46:26,159 |-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - debug attribute not set
12:46:26,176 |-INFO in ch.qos.logback.core.joran.action.ConversionRuleAction - registering conversion word logxtracemsg with class [com.sri.ai.util.log.LogXTraceConverter]
12:46:26,176 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - About to instantiate appender of type [ch.qos.logback.core.ConsoleAppender]
12:46:26,189 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - Naming appender as [stdout]
12:46:26,251 |-INFO in ch.qos.logback.classic.joran.action.LoggerAction - Setting additivity of logger [com.sri.ai.grinder.helper.Trace] to false
12:46:26,252 |-INFO in ch.qos.logback.classic.joran.action.LevelAction - com.sri.ai.grinder.helper.Trace level set to TRACE
12:46:26,252 |-INFO in ch.qos.logback.classic.joran.action.LoggerAction - Setting additivity of logger [com.sri.ai.grinder.helper.Justification] to false
12:46:26,252 |-INFO in ch.qos.logback.classic.joran.action.LevelAction - com.sri.ai.grinder.helper.Justification level set to TRACE
12:46:26,252 |-INFO in ch.qos.logback.classic.joran.action.LevelAction - ROOT level set to DEBUG
12:46:26,252 |-INFO in ch.qos.logback.core.joran.action.AppenderRefAction - Attaching appender named [stdout] to Logger[ROOT]
12:46:26,253 |-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - End of configuration.
12:46:26,253 |-INFO in ch.qos.logback.classic.joran.JoranConfigurator@67b6d4ae - Registering current configuration as safe fallback point
12:46:26.258 [main] DEBUG Jena - Jena initialization
12:46:26.335 [main] DEBUG org.apache.jena.util.FileManager - Add location: LocatorFile
12:46:26.335 [main] DEBUG org.apache.jena.util.FileManager - Add location: ClassLoaderLocator
12:46:26.337 [main] DEBUG org.apache.jena.util.LocationMapper - Failed to find configuration: file:location-mapping.rdf;file:location-mapping.n3;file:location-mapping.ttl;file:etc/location-mapping.rdf;file:etc/location-mapping.n3;file:etc/location-mapping.ttl
12:46:26.337 [main] DEBUG org.apache.jena.util.FileManager - Add location: LocatorFile
12:46:26.338 [main] DEBUG org.apache.jena.util.FileManager - Add location: LocatorURL
12:46:26.338 [main] DEBUG org.apache.jena.util.FileManager - Add location: ClassLoaderLocator
12:46:26.343 [main] DEBUG o.a.j.r.s.stream.JenaIOEnvironment - Failed to find configuration: location-mapping.ttl;location-mapping.rdf;location-mapping.n3;etc/location-mapping.rdf;etc/location-mapping.n3;etc/location-mapping.ttl
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/xerces/util/XMLChar
at org.apache.jena.shared.impl.PrefixMappingImpl.checkLegal(PrefixMappingImpl.java:172)
at org.apache.jena.shared.impl.PrefixMappingImpl.setNsPrefix(PrefixMappingImpl.java:72)
at org.apache.jena.shared.PrefixMapping.<clinit>(PrefixMapping.java:219)
at org.apache.jena.sparql.ARQConstants.<clinit>(ARQConstants.java:106)
at org.apache.jena.query.ARQ.init(ARQ.java:588)
at org.apache.jena.sparql.system.InitARQ.start(InitARQ.java:29)
at org.apache.jena.system.JenaSystem.lambda$init$2(JenaSystem.java:119)
at java.util.ArrayList.forEach(Unknown Source)
at org.apache.jena.system.JenaSystem.forEach(JenaSystem.java:194)
at org.apache.jena.system.JenaSystem.forEach(JenaSystem.java:171)
at org.apache.jena.system.JenaSystem.init(JenaSystem.java:117)
at org.apache.jena.rdf.model.ModelFactory.<clinit>(ModelFactory.java:49)
at com.sri.ai.praise.jdsonld.ReadJenaJSONLD.main(ReadJenaJSONLD.java:11)
Caused by: java.lang.ClassNotFoundException: org.apache.xerces.util.XMLChar
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 13 more
