JAXB fails to generate Java classes for XBRL - jaxb

Question

I'm trying to generate Java classes for types defined in XBRL.
My build process is based on Maven 2, and here are my trials. I only paste the build section, which relies on some properties:
package is the name of my target package
catalog is the path and file name of the catalog. because I have no internet connection, I have amny entries, but I think those are always necessary
-- TR9401 for XBRL resources --
SYSTEM http://www.xbrl.org/2003/XLink http/www.xbrl.org/2003/xl-2003-12-31.xsd
SYSTEM http://www.w3.org/1999/xlink http/www.xbrl.org/2003/xlink-2003-12-31.xsd
xsd.path is the directory where the XSD resides
xsd.file is the file name of the following minimalist XSD
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:import namespace="http://www.xbrl.org/2003/instance"
schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
</xs:schema>
All plugins I have tried fail to import xl:nonEmptyURI.
But xl is mapped to http://www.xbrl.org/2003/XLink (which is in my catalog) which imports <import namespace="http://www.w3.org/1999/xlink" schemaLocation="xlink-2003-12-31.xsd"/> which defines nonEmptyURI
What's wrong? How can I fix it?
Apache CXF
<plugin>
<groupId>org.apache.cxf</groupId>
<artifactId>cxf-xjc-plugin</artifactId>
<executions>
<execution>
<id>generate-sources</id>
<phase>generate-sources</phase>
<goals>
<goal>xsdtojava</goal>
</goals>
<configuration>
<xsdOptions>
<xsdOption>
<catalog>${catalog}</catalog>
<xsd>${xsd.path}/${xsd.file}</xsd>
<packagename>${package}</packagename>
</xsdOption>
</xsdOptions>
</configuration>
</execution>
</executions>
</plugin>
Fails with
parsing a schema...
[ERROR] src-resolve: Cannot resolve the name 'xl:nonEmptyURI' to a(n) 'type definition' component.
line 389 of cache/http/www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd
jvnet maven-jaxb2-plugin
<plugin>
<!-- http://jaxb.java.net/ -->
<groupId>org.jvnet.jaxb2.maven2</groupId>
<artifactId>maven-jaxb2-plugin</artifactId>
<version>0.8.2</version>
<executions>
<execution>
<id>generate</id>
<phase>generate-sources</phase>
<goals>
<goal>generate</goal>
</goals>
</execution>
</executions>
<configuration>
<catalog>${catalog}</catalog>
<schemaDirectory>${xsd.path}</schemaDirectory>
<generatePackage>${package}</generatePackage>
<strict>false</strict>
<extension>true</extension>
<plugins>
<plugin>
<groupId>org.jvnet.jaxb2_commons</groupId>
<artifactId>jaxb2-basics</artifactId>
<version>0.6.4</version>
</plugin>
<plugin>
<groupId>org.jvnet.jaxb2_commons</groupId>
<artifactId>jaxb2-basics-annotate</artifactId>
<version>0.6.4</version>
</plugin>
</plugins>
<args>
<arg>-Xannotate</arg>
<arg>-XtoString</arg>
</args>
</configuration>
</plugin>
The error is the same, a little more verbose
[INFO] Parsing input schema(s)...
[ERROR] Error while parsing schema(s).Location [ cache/http/www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd{389,74}].
org.xml.sax.SAXParseException: undefined simple type 'xl:nonEmptyURI'
at com.sun.xml.xsom.impl.parser.ParserContext$1.reportError(ParserContext.java:180)
at com.sun.xml.xsom.impl.parser.NGCCRuntimeEx.reportError(NGCCRuntimeEx.java:175)
at com.sun.xml.xsom.impl.parser.DelayedRef.resolve(DelayedRef.java:110)
[...]
[ERROR] Error while parsing schema(s).Location [ cache/http/www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd{412,77}].
org.xml.sax.SAXParseException: undefined simple type 'xl:nonEmptyURI'
at com.sun.xml.xsom.impl.parser.ParserContext$1.reportError(ParserContext.java:180)
at com.sun.xml.xsom.impl.parser.NGCCRuntimeEx.reportError(NGCCRuntimeEx.java:175)
at com.sun.xml.xsom.impl.parser.DelayedRef.resolve(DelayedRef.java:110)
[ERROR] Failed to execute goal org.jvnet.jaxb2.maven2:maven-jaxb2-plugin:0.8.2:generate (generate) on project solvency2: Unable to parse input schema(s). Error messages should have been provided. -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.jvnet.jaxb2.maven2:maven-jaxb2-plugin:0.8.2:generate (generate) on project solvency2: Unable to parse input schema(s). Error messages should have been provided.
Mojo jaxb2-maven-plugin
<plugin>
<!--http://mojo.codehaus.org/ -->
<groupId>org.codehaus.mojo</groupId>
<artifactId>jaxb2-maven-plugin</artifactId>
<version>1.5</version>
<executions>
<execution>
<id>xjc</id>
<phase>generate-sources</phase>
<goals>
<goal>xjc</goal>
</goals>
</execution>
</executions>
<configuration>
<schemaDirectory>${xsd.path}</schemaDirectory>
<packageName>${package}</packageName>
<catalog>${catalog}</catalog>
</configuration>
</plugin>
Same error, said differently by Xerces
[ERROR] file:[...]cache/http/www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd[472,74]
org.xml.sax.SAXParseException: src-resolve: Cannot resolve the name 'xl:nonEmptyURI' to a(n) 'simpleType definition' component.
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:195)
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(ErrorHandlerWrapper.java:131)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:384)

Answer 1

You definitely need all schemas to be downloaded and added to catalog in your case. I had a similar problem with generating Java classes, but I didn't use any catalogs at all just put all the schemas the XBRL uses into the same folder. The same way they're organized on XBRL site:
src\main\resources\xbrl\
xbrl-instance-2003-12-31.xsd
xbrl-linkbase-2003-12-31.xsd
xl-2003-12-31.xsd
xlink-2003-12-31.xsd
xbrl_bindings.xjb
Also I added a JAXB binding as you can see to resolve a conflict that raises during the source generation and put into the same folder.
xbrl_bindings.xjb:
<bindings xmlns="http://java.sun.com/xml/ns/jaxb"
xmlns:xsi="http://www.w3.org/2000/10/XMLSchema-instance"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:xjc="http://java.sun.com/xml/ns/jaxb/xjc"
version="2.1">
<bindings schemaLocation="xl-2003-12-31.xsd" version="1.0">
<bindings node="//xs:schema//xs:element[#name='title']">
<property name="xlTitle"/>
</bindings>
</bindings>
Maven plugin configuration:
<plugin>
<groupId>org.apache.cxf</groupId>
<artifactId>cxf-xjc-plugin</artifactId>
<version>2.6.1</version>
<executions>
<execution>
<id>generate-sources</id>
<phase>generate-sources</phase>
<goals>
<goal>xsdtojava</goal>
</goals>
<configuration>
<sourceRoot>${basedir}/target/generated/src/main/java</sourceRoot>
<xsdOptions>
<xsdOption>
<bindingFile>${path.to.xsd}/xbrl_bindings.xjb</bindingFile>
<xsd>${path.to.xsd}/xbrl-instance-2003-12-31.xsd</xsd>
</xsdOption>
</xsdOptions>
</configuration>
</execution>
</executions>
</plugin>
Enjoy XBRL :)

Answer 2

In your catalog, you probably need to change SYSTEM with PUBLIC.
See also: this article
According to this article, PUBLIC is used for matching a namespace URI:
-- Match address.xsd by URL --
SYSTEM "http://www.example.com/address/address.xsd" "imports/address.xsd"
-- Match phone-number.xsd by namespace URI --
PUBLIC "http://www.example.com/phone-number" "imports/phone-number.xsd"
Did you download the XSD and put it in an imports folder?