Getting a org.xml.sax.SAXParseException "is already defined"

I am getting the following Exceptions on my *.xsd files: link to error

It says that there is a double definition on line 47, with the first appearance being at line 10.

When looking at the file itself I don’t notice any double names. The line to which the exception occurs contains: <xs:complexType name="AfzenderAdresType"> while the “first definition” contains <xs:complexType name="OntvangerAdresType">. (You can find the file itself here)

The both have similar but different names and their definition is nearly identical. What is going on here? Any help as to how I can fix this?

[buko]

BTW this happens when the same schema is being compiled twice. For example, xsd:imports and schemas and episodes defined in the pom.xml. It’s very confusing. I spent quite a while figuring out how to do modular schema builds with the plugin that don’t produce errors like that. Work is documented in https://github.com/bubblegumproject/scrum4j-model

[maffe]

I got the same exception with these two XSD files:

• http://xmlapi.nic-direct.de/ch02.html#cnt_create
• http://xmlapi.nic-direct.de/ch02.html#cnt_activate

It worked after I added a unique targetNamespace to each of the XSD files. This doesn’t appear to change the generated Java files in any way.

Update: adding namespaces to the XSD files will cause package-info.java with namespace information to be generated. I use the maven-clean-plugin to remove those files because in my case the generated XML must not use namespaces:

<plugin>
    <artifactId>maven-clean-plugin</artifactId>
    <version>3.1.0</version>
    <executions>
        <execution>
            <id>remove-namespaces</id>
            <phase>process-sources</phase>
            <goals>
                <goal>clean</goal>
            </goals>
            <configuration>
                <excludeDefaultDirectories>true</excludeDefaultDirectories>
                <verbose>true</verbose>
                <filesets>
                    <fileset>
                        <directory>${project.build.directory}/generated-sources/xjc</directory>
                        <includes>
                            <include>**/package-info.java</include>
                        </includes>
                        <followSymlinks>false</followSymlinks>
                    </fileset>
                </filesets>
            </configuration>
        </execution>
    </executions>
</plugin>