Validating wsdl and schema without internet in mule esb standalone - xsd

Question

I have an esb app that exposes a SOAP web service (which uses CSIO schema).
Following is the snippet from my wsdl:
<wsdl:definitions xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" xmlns:tns="http://www.CSIO.org/standards/PC_Surety/CSIO4.3.0/xml/" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:ns1="http://schemas.xmlsoap.org/soap/http" name="MyService" targetNamespace="http://www.CSIO.org/standards/PC_Surety/CSIO4.3.0/xml/" xmlns:ns0="http://www.ACORD.org/standards/PC_Surety/ACORD1.7.0/xml/">
I dont have any trouble during start up in my desktop where I use AnyPoint Studio. When I deploy in linux based stand alone servers, I ran into this issue.
The following start up log is from one of my lower environments. It appears mule is going to internet to validate namespace.
INFO [WrapperListener_start_runner] ? (:) - Initialising service: MyFlowWebservice.stage1
INFO [WrapperListener_start_runner] ? (:) - Creating Service {http://www.CSIO.org/standards/PC_Surety/CSIO4.3.0/xml/}MyService from WSDL: classpath:MyService.wsdl
When I go into higher environments where the server does not have access to internet, following is what I see
INFO [WrapperListener_start_runner] ? (:) - Initialising service: MyFlowWebservice.stage1
WARN [WrapperListener_start_runner] ? (:) - Exception encountered during context initialization - cancelling refresh attempt
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'MyFlowWebservice': Invocation of init method failed; nested exception is org.mule.api.lifecycle.InitialisationException: SERVICE_CREATION_MSG
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1514) ~[?:?]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:521) ~[?:?]
.....
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.....
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Caused by: javax.wsdl.WSDLException: WSDLException (at /wsdl:definitions/wsdl:types/xsd:schema/xsd:schema/xsd:schema/xsd:schema): faultCode=PARSER_ERROR: Problem parsing 'file:/opt/mule/myesb/apps/myesb-1.0-SNAPSHOT/classes/schemas/xml-ns.xsd'.: java.net.ConnectException: Connection refused
at com.ibm.wsdl.xml.WSDLReaderImpl.getDocument(Unknown Source) ~[?:?]
at com.ibm.wsdl.xml.WSDLReaderImpl.parseSchema(Unknown Source) ~[?:?]
at com.ibm.wsdl.xml.WSDLReaderImpl.parseSchema(Unknown Source) ~[?:?]
Opening access to internet is not an option at this point. I am not sure what to try as I have little knowledge on XML namespaces. Any suggestion on how to avoid this issue?

Answer 1

I have found the solution.
There is this line in one of the schema files - xml-ns.xsd:
<!DOCTYPE xs:schema PUBLIC "-//W3C//DTD XMLSCHEMA 200102//EN" "http://www.w3.org/2001/XMLSchema.dtd">
I downloaded XMLSchema.dtd in to the same folder where other schema files are and replaced the line "http://www.w3.org/2001/XMLSchema.dtd" with just "XMLSchema.dtd"