WSIMPORT command to

 [hydev@localhost WSDL2JAVA]$ wsimport -p com.msasafety.ac.servicelayer.integration.data.sap -J-Djavax.xml.accessExternalSchema=all -J-Djavax.xml.accessExternalDTD=all -keep -verbose  -b http://www.w3.org/2001/XMLSchema.xsd  -b xsd.xjb https://xxx.xxx.com/SapService.asmx?wsdl

file content of xsd.xjb

<?xml version="1.0" encoding="UTF-8"?>

<bindings xmlns="http://java.sun.com/xml/ns/jaxb"

          xmlns:xsd="http://www.w3.org/2001/XMLSchema"

          xmlns:xjc="http://java.sun.com/xml/ns/jaxb/xjc"

          version="2.0">

  <globalBindings>

    <xjc:simple />

  </globalBindings>

  <bindings scd="~xsd:complexType">

    <class name="ComplexTypeType"/>

  </bindings>

  <bindings scd="~xsd:simpleType">

    <class name="SimpleTypeType"/>

  </bindings>

  <bindings scd="~xsd:group">

    <class name="GroupType"/>

  </bindings>

  <bindings scd="~xsd:attributeGroup">

    <class name="AttributeGroupType"/>

  </bindings>

  <bindings scd="~xsd:element">

    <class name="ElementType"/>

  </bindings>

  <bindings scd="~xsd:attribute">

    <class name="attributeType"/>

  </bindings>

</bindings>