Axis 1.6.1 or Flash Builder 4.6: Unsupported content Simple Content

if you get "log4j:WARN Please initialize the log4j system properly", create the file log4j.properties in C:\apps\axis2-1.6.1 (AXIS_HOME):

log4j.rootLogger=debug, stdout
 
# Direct log messages to stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n

After that I see that by running:
wsdl2java -d adb -uri yourwslduri

I get

2013-03-05 11:41:46 DEBUG ProjectResourceBundle:70 - org.apache.axis2.schema.i18n.resource::handleGe
tObject(schema.unsupportedcontenterror)
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(CodeGenerationEngine.java:293)
        at org.apache.axis2.wsdl.WSDL2Code.main(WSDL2Code.java:35)
        at org.apache.axis2.wsdl.WSDL2Java.main(WSDL2Java.java:24)
Caused by: java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
        at org.apache.axis2.wsdl.codegen.extension.SimpleDBExtension.engage(SimpleDBExtension.java:53)
        at org.apache.axis2.wsdl.codegen.CodeGenerationEngine.generate(CodeGenerationEngine.java:246
)
        ... 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(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.axis2.wsdl.codegen.extension.SimpleDBExtension.engage(SimpleDBExtension.java:50)
        ... 3 more
Caused by: org.apache.axis2.schema.SchemaCompilationException: Unsupported content Simple Content !
        at org.apache.axis2.schema.SchemaCompiler.copyMetaInfoHierarchy(SchemaCompiler.java:1412)
        at org.apache.axis2.schema.SchemaCompiler.processComplexContent(SchemaCompiler.java:1278)
        at org.apache.axis2.schema.SchemaCompiler.processContentModel(SchemaCompiler.java:1227)
        at org.apache.axis2.schema.SchemaCompiler.processComplexType(SchemaCompiler.java:1171)
        at org.apache.axis2.schema.SchemaCompiler.processNamedComplexSchemaType(SchemaCompiler.java:1091)
        at org.apache.axis2.schema.SchemaCompiler.processSchema(SchemaCompiler.java:1005)
        at org.apache.axis2.schema.SchemaCompiler.processElement(SchemaCompiler.java:644)
        at org.apache.axis2.schema.SchemaCompiler.processElement(SchemaCompiler.java:614)
        at org.apache.axis2.schema.SchemaCompiler.compile(SchemaCompiler.java:422)
        at org.apache.axis2.schema.SchemaCompiler.compile(SchemaCompiler.java:381)
        at org.apache.axis2.schema.SchemaCompiler.compile(SchemaCompiler.java:381)
        at org.apache.axis2.schema.SchemaCompiler.compile(SchemaCompiler.java:381)
        at org.apache.axis2.schema.SchemaCompiler.compile(SchemaCompiler.java:291)
        at org.apache.axis2.schema.ExtensionUtility.invoke(ExtensionUtility.java:102)
        ... 8 more

while if I use -d xmlbeans, all goes fine.

I see this code:

XmlSchemaType type = resolvedSchema.getTypeByName(baseTypeName);

XmlSchemaComplexType complexType = (XmlSchemaComplexType) type;

XmlSchemaContentModel content = complexType.getContentModel();
....
if (content instanceof XmlSchemaSimpleContent) {
   throw new SchemaCompilationException(SchemaCompilerMessages.getMessage("schema.unsupportedcontenterror", "Simple Content"));

This org.apache.axis2.schema.SchemaCompiler is in axis2-adb-codegen-1.6.1.jar

I have downloaded the source code, and added:

 try {
     log.warn("copyMetaInfoHierarchy " + baseTypeName.toString() + " " + parentSchema.toString());
     System.out.println("copyMetaInfoHierarchy " + baseTypeName.toString() + " " + parentSchema.toString());
 }
 catch (Throwable t) {
     log.error("copyMetaInfoHierarchy", t);
     t.printStackTrace();
 }

at the beginning of copyMetaInfoHierarchy (I had also to make sure that parentSchema is declared as org.apache.ws.commons.schema.XmlSchema.

I found out that the offending element is a

  <xsd:complexType name="ItemClassificationCodeType">
    <xsd:simpleContent>
      <xsd:extension base="tns:CodeType" />
    </xsd:simpleContent>
  </xsd:complexType>

  <xsd:complexType name="CodeType">
  
    <xsd:simpleContent>
      <xsd:extension base="xsd:normalizedString">
        <xsd:attribute name="listID" type="xsd:token" use="optional">
        </xsd:attribute>
        <xsd:attribute name="listAgencyID" type="xsd:anyURI" use="optional">
        </xsd:attribute>
      </xsd:extension>
    </xsd:simpleContent>
  </xsd:complexType>
  

I think adb doesn't like the simpleContent http://www.w3schools.com/schema/el_simpleContent.asp, and this is the JIRA issue (July 2012) :
https://issues.apache.org/jira/browse/AXIS2-5357

it looks like even Axis 1.6.2 (April 2012) is not handling this syntax.

I bet my ass that Flash Builder is using Axis2 under the cover