IllegalArgumentException: key can't be empty -- Which Key?

Question

Trying to build a demo contract-first service from a sample WSDL (using CXF 2.7.1):

<?xml version='1.0' encoding='UTF-8'?>
<wsdl:definitions name="OrderProcessService" targetNamespace="http://order.demo/" xmlns:ns1="http://schemas.xmlsoap.org/soap/http" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:tns="http://order.demo/" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <wsdl:types>
        <xs:schema attributeFormDefault="unqualified" elementFormDefault="unqualified" targetNamespace="http://order.demo/" xmlns:tns="http://order.demo/" xmlns:xs="http://www.w3.org/2001/XMLSchema">
            <xs:element name="processOrder" type="tns:processOrder" />
            <xs:element name="processOrderResponse" type="tns:processOrderResponse" />
            <xs:complexType name="processOrder">
                <xs:sequence>
                    <xs:element minOccurs="0" name="arg0" type="tns:order" />
                </xs:sequence>
            </xs:complexType>
            <xs:complexType name="order">
                <xs:sequence>
                    <xs:element minOccurs="0" name="customerID" type="xs:string" />
                    <xs:element minOccurs="0" name="itemID" type="xs:string" />
                    <xs:element name="price" type="xs:double" />
                    <xs:element name="qty" type="xs:int" />
                </xs:sequence>
            </xs:complexType>
            <xs:complexType name="processOrderResponse">
                <xs:sequence>
                    <xs:element minOccurs="0" name="return" type="xs:string" />
                </xs:sequence>
            </xs:complexType>
        </xs:schema>
    </wsdl:types>
    <wsdl:message name="processOrderResponse">
        <wsdl:part element="tns:processOrderResponse" name="parameters">
        </wsdl:part>
    </wsdl:message>
    <wsdl:message name="processOrder">
        <wsdl:part element="tns:processOrder" name="parameters">
        </wsdl:part>
    </wsdl:message>
    <wsdl:portType name="OrderProcess">
        <wsdl:operation name="processOrder">
            <wsdl:input message="tns:processOrder" name="processOrder">
            </wsdl:input>
            <wsdl:output message="tns:processOrderResponse" name="processOrderResponse">
            </wsdl:output>
        </wsdl:operation>
    </wsdl:portType>
    <wsdl:binding name="OrderProcessServiceSoapBinding" type="tns:OrderProcess">
        <soap:binding style="document" transport="http://schemas.xmlsoap.org/soap/http" />
        <wsdl:operation name="processOrder">
            <soap:operation soapAction="" style="document" />
            <wsdl:input name="processOrder">
                <soap:body use="literal" />
            </wsdl:input>
            <wsdl:output name="processOrderResponse">
                <soap:body use="literal" />
            </wsdl:output>
        </wsdl:operation>
    </wsdl:binding>
    <wsdl:service name="OrderProcessService">
        <wsdl:port binding="tns:OrderProcessServiceSoapBinding" name="OrderProcessPort">
            <soap:address location="http://localhost:8080/OrderProcess" />
        </wsdl:port>
    </wsdl:service>
</wsdl:definitions>

I issued the following:

wsdl2java -ant -impl -server -d src OrderProcess.wsdl

Source code generation goes fine but when I try to build the server, using ant OrderProcessServer, I receive the following exception:

OrderProcessServer:
     [java] Starting Server
     [java] Exception in thread "main" java.lang.ExceptionInInitializerError
     [java]     at org.eclipse.jetty.util.component.AbstractLifeCycle.<clinit>(AbstractLifeCycle.java:33)
     [java]     at org.apache.cxf.transport.http_jetty.JettyHTTPDestination.activate(JettyHTTPDestination.java:178)
     [java]     at org.apache.cxf.transport.AbstractObservable.setMessageObserver(AbstractObservable.java:48)
     [java]     at org.apache.cxf.binding.AbstractBaseBindingFactory.addListener(AbstractBaseBindingFactory.java:95)
     [java]     at org.apache.cxf.binding.soap.SoapBindingFactory.addListener(SoapBindingFactory.java:895)
     [java]     at org.apache.cxf.endpoint.ServerImpl.start(ServerImpl.java:131)
     [java]     at org.apache.cxf.jaxws.EndpointImpl.doPublish(EndpointImpl.java:360)
     [java]     at org.apache.cxf.jaxws.EndpointImpl.publish(EndpointImpl.java:251)
     [java]     at org.apache.cxf.jaxws.spi.ProviderImpl.createAndPublishEndpoint(ProviderImpl.java:152)
     [java]     at javax.xml.ws.Endpoint.publish(Endpoint.java:57)
     [java]     at demo.order.OrderProcess_OrderProcessPort_Server.<init>(OrderProcess_OrderProcessPort_Server.java:19)
     [java]     at demo.order.OrderProcess_OrderProcessPort_Server.main(OrderProcess_OrderProcessPort_Server.java:23)
     [java] Caused by: java.lang.IllegalArgumentException: key can't be empty
     [java]     at java.lang.System.checkKey(System.java:774)
     [java]     at java.lang.System.getProperty(System.java:647)
     [java]     at org.eclipse.jetty.util.log.Log$1.run(Log.java:122)
     [java]     at java.security.AccessController.doPrivileged(Native Method)
     [java]     at org.eclipse.jetty.util.log.Log.<clinit>(Log.java:85)
     [java]     ... 12 more
     [java] Java Result: 1

BUILD SUCCESSFUL
Total time: 2 seconds

My questions are:

1. What key?
2. How do provide it so that I don't get the exception?
3. Why is wsdl2java producing code that is incomplete? (i.e. isn't the .wsdl file sufficient?)

UPDATE: The ANT build.xml file produced by the wsdl2java command has these 2 seemingly relevant lines:

<sysproperty key="java.util.logging.config.file" value="${cxf.etc.dir}/logging.properties"/>
<sysproperty key="log4j.configuration" value="file:///${cxf.etc.dir}/log4j.properties"/>

1. Are they key (no pun intended) to the problem?
2. If so, what values should I put there in order to fix it?
3. How do I tell wsdl2java to generate code that I don't need to fix?

Answer 1

Jetty's Log implementation is reading the system properties like this:

Enumeration<String> systemKeyEnum = Enumeration<String>)System.getProperties().propertyNames();

while (systemKeyEnum.hasMoreElements())
{
    String key = systemKeyEnum.nextElement();
    String val = System.getProperty(key);
    // ... (process key/values)
}

For some reason you have managed to have an empty key: "" in your System properties. So check all the places where you set System Properties programmatically (System.setProperty) and your java commandline for -D options. If that doesn't help, try to print your system properties before this exception occurs or do a jpda debug session and place a breakpoint either at Log line <122 or at System.checkKey().

Answer 2

The empty keys come from the cxfrun macro in the generated ant script, build.xml.

Comment it out like so and you should be fine:

<arg value="@{param1}"/>
<arg value="@{param2}"/>
<arg value="@{param3}"/>
<arg value="@{param4}"/>
<arg value="@{param5}"/>
<jvmarg value="${cxf.endorsed.flag}"/>
<!-- Commented out to remove empty keys in system properties -->
<!-- jvmarg value="@{jvmarg1}"/>
<jvmarg value="@{jvmarg2}"/>
<jvmarg value="@{jvmarg3}"/>
<jvmarg value="@{jvmarg4}"/>
<jvmarg value="@{jvmarg5}"/ -->