Estou tentando usar o Maven para gerar arquivos JAXB a serem usados pelo framework Spring, mas o Maven exibe os seguintes erros:

Entendo que não é possível gerar arquivos com os nomes, mas não sei como resolver o problema. Até agora, visitei os seguintes links.1, 2, 3

org.xml.sax.SAXParseException; systemId: http://www5v80.elsyarres.net/service.asmx?wsdl; lineNumber: 5; columnNumber: 39; A class/interface with the same name "hello.wsdl.SearchFlights" is already in use. Use a class customization to resolve this conflict.
....
org.xml.sax.SAXParseException; systemId: http://www5v80.elsyarres.net/service.asmx?wsdl; lineNumber: 12; columnNumber: 43; (Relevant to above error) another "SearchFlights" is generated from here.
....
org.xml.sax.SAXParseException; systemId: http://www5v80.elsyarres.net/service.asmx?wsdl; lineNumber: 371; columnNumber: 42; A class/interface with the same name "hello.wsdl.GetFlightDetails" is already in use. Use a class customization to resolve this conflict.
....

Maven plugin

    <plugin>
        <artifactId>maven-war-plugin</artifactId>
        <version>2.4</version>
        <configuration>
            <warSourceDirectory>WebContent</warSourceDirectory>
        </configuration>
    </plugin>
    <plugin>
        <groupId>org.jvnet.jaxb2.maven2</groupId>
        <artifactId>maven-jaxb2-plugin</artifactId>
        <version>0.12.3</version>
        <executions>
            <execution>
                <goals>
                    <goal>generate</goal>
                </goals>
            </execution>
        </executions>
        <configuration>
            <schemaLanguage>WSDL</schemaLanguage>
            <generatePackage>hello.wsdl</generatePackage>
            <schemas>
                <schema>
                    <url>http://www5v80.elsyarres.net/service.asmx?wsdl</url>
                </schema>
            </schemas>
        </configuration>
    </plugin>

Eu adicionei a seguirpackage-info.java arquivo para ohello.wsdl pacote, mas não ajudou.

@XmlSchema( 
    namespace = "ElsyArres.API",
    elementFormDefault = XmlNsForm.QUALIFIED) 
package hello.wsdl;

import javax.xml.bind.annotation.XmlNsForm;
import javax.xml.bind.annotation.XmlSchema;