WSDL2JAVA fails with multiple anonymous simple types

The problem is that WSDL2JAVA fails when there is more than 1 anonymous simple type. For some reason it works fine if there is 1 anonymous simple type. I'm not sure but this may affect multiple anonymous complex types as well.

Consider the example where the schema defines 2 elements (first and last name). If the schema defined in the WSDL includes 1 anonymous simple type, everything works fine (like this)...

<xsd:element name="firstName">
<xsd:simpleType>
<xsd:restriction base="xsd:string">
<xsd:maxLength value="10" />
</xsd:restriction>
</xsd:simpleType>
</xsd:element>

<xsd:element name="lastName" type="xsd:string" />

As soon as you add more than one anonymous simple type (like below) WSDL2JAVA throws an exception.
<xsd:element name="firstName">
<xsd:simpleType>
<xsd:restriction base="xsd:string">
<xsd:maxLength value="10" />
</xsd:restriction>
</xsd:simpleType>
</xsd:element>

<xsd:element name="lastName">
<xsd:simpleType>
<xsd:restriction base="xsd:string">
<xsd:maxLength value="20" />
</xsd:restriction>
</xsd:simpleType>
</xsd:element>

The exception and full WSDL is listed at the bottom of this email. We can work around this problem by pulling out all the anonymous simple types and creating named types. However we are not the ones generating the service code and WSDL. It is being generated by another language and it uses these anonymous simple (and complex) types extensively. So we would have to do this for some very complex WSDL across a lot of services and hundreds of operations. And each time a service or operation was changed we have to do it by hand all over again which would be very tedious and error prone.

Exception in thread "main" org.apache.axis2.wsdl.codegen.CodeGenerationException
: java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at org.apache.axis2.wsdl.codegen.CodeGenerationEngine.generate(CodeGener
ationEngine.java:224)
at org.apache.axis2.wsdl.WSDL2Code.main(WSDL2Code.java:32)
at org.apache.axis2.wsdl.WSDL2Java.main(WSDL2Java.java:21)
Caused by: java.lang.RuntimeException: java.lang.reflect.InvocationTargetExcepti
on
at org.apache.axis2.wsdl.codegen.extension.SimpleDBExtension.engage(Simp
leDBExtension.java:52)
at org.apache.axis2.wsdl.codegen.CodeGenerationEngine.generate(CodeGener
ationEngine.java:177)
... 2 more
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.apache.axis2.wsdl.codegen.extension.SimpleDBExtension.engage(Simp
leDBExtension.java:49)
... 3 more
Caused by: org.apache.axis2.schema.SchemaCompilationException: java.lang.NullPoi
nterException
at org.apache.axis2.schema.SchemaCompiler.compile(SchemaCompiler.java:25
7)
at org.apache.axis2.schema.ExtensionUtility.invoke(ExtensionUtility.java
:72)
... 8 more
Caused by: java.lang.NullPointerException
at org.apache.axis2.schema.SchemaCompiler.processElement(SchemaCompiler.
java:592)
at org.apache.axis2.schema.SchemaCompiler.processElement(SchemaCompiler.
java:489)
at org.apache.axis2.schema.SchemaCompiler.process(SchemaCompiler.java:14
88)
at org.apache.axis2.schema.SchemaCompiler.processParticle(SchemaCompiler
.java:1450)
at org.apache.axis2.schema.SchemaCompiler.processComplexType(SchemaCompi
ler.java:950)
at org.apache.axis2.schema.SchemaCompiler.processNamedComplexSchemaType(
SchemaCompiler.java:909)
at org.apache.axis2.schema.SchemaCompiler.processSchema(SchemaCompiler.j
ava:864)
at org.apache.axis2.schema.SchemaCompiler.processElement(SchemaCompiler.
java:527)
at org.apache.axis2.schema.SchemaCompiler.processElement(SchemaCompiler.
java:499)
at org.apache.axis2.schema.SchemaCompiler.compile(SchemaCompiler.java:33
6)
at org.apache.axis2.schema.SchemaCompiler.compile(SchemaCompiler.java:24
8)
... 9 more

Full WSDL

<?xml version="1.0" encoding="UTF-8" standalone="no" ?>
<wsdl:definitions xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/"
name="AddressBook" targetNamespace="http://sears.org/"
xmlns:sears="http://sears.org/"
xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/"
xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<wsdl:types>
<xsd:schema elementFormDefault="qualified"
targetNamespace="http://sears.org/" xmlns:s1="http://sears.org/">

<xsd:complexType name="Person">
<xsd:sequence>
<xsd:element name="firstName" type="xsd:string" />
<xsd:element name="lastName" type="xsd:string" />
</xsd:sequence>
</xsd:complexType>

<xsd:complexType name="AddressBookEntry">
<xsd:sequence>
<xsd:element name="firstName">
<xsd:simpleType>
<xsd:restriction base="xsd:string">
<xsd:maxLength value="10" />
</xsd:restriction>
</xsd:simpleType>
</xsd:element>
<xsd:element name="lastName">
<xsd:simpleType>
<xsd:restriction base="xsd:string">
<xsd:maxLength value="20" />
</xsd:restriction>
</xsd:simpleType>
</xsd:element>
<xsd:element name="streetAddress" type="xsd:string" />
<xsd:element name="city" type="xsd:string" />
<xsd:element name="state" type="xsd:string" />
<xsd:element name="zipCode" type="xsd:int" />
<xsd:element name="phoneNumber" type="xsd:string" />
</xsd:sequence>
</xsd:complexType>

<xsd:element name="addressLookupRequest" type="Person" />

<xsd:element name="addressLookupResponse"
type="AddressBookEntry" />
</xsd:schema>
</wsdl:types>
<wsdl:message name="AddressLookupIn">
<wsdl:part element="sears:addressLookupRequest"
name="parameters" />
</wsdl:message>
<wsdl:message name="AddressLookupOut">
<wsdl:part element="sears:addressLookupResponse"
name="parameters" />
</wsdl:message>
<wsdl:portType name="AddressBookPortType">
<wsdl:operation name="AddressLookup">
<wsdl:input message="sears:AddressLookupIn"
name="addressLookupRequest" />
<wsdl:output message="sears:AddressLookupOut"
name="addressLookupResponse" />
</wsdl:operation>
</wsdl:portType>
<wsdl:binding name="AddressBookBinding"
type="sears:AddressBookPortType">
<soap:binding transport="http://schemas.xmlsoap.org/soap/http" />
<wsdl:operation name="AddressLookup">
<soap:operation soapAction="AddressLookup" style="document" />
<wsdl:input name="addressLookupRequest">
<soap:body use="literal" />
</wsdl:input>
<wsdl:output name="addressLookupResponse">
<soap:body use="literal" />
</wsdl:output>
</wsdl:operation>
</wsdl:binding>
<wsdl:service name="AddressBook">
<wsdl:port binding="sears:AddressBookBinding"
name="AddressBookPortType">
<soap:address
location="http://localhost:8080/axis2/services/AddressBook" />
</wsdl:port>
</wsdl:service>
</wsdl:definitions>