accessExternalSchema is not recognized

Question

I am trying to generate Java classes using Maven from XSDs/WSDLs. I have declared all the XSDs in my POM file and using the XJC plugin. When I try to do a clean install, I see these two error messages show up.

[DEBUG] [SchemaGen]: May 02, 2019 5:49:09 PM com.sun.xml.bind.v2.util.XmlFactory allowExternalAccess
CONFIG: Property "http://javax.xml.XMLConstants/property/accessExternalSchema" is not supported by used JAXP implementation.
org.xml.sax.SAXNotRecognizedException: Property 'http://javax.xml.XMLConstants/property/accessExternalSchema' is not recognized.
        at org.apache.xerces.jaxp.validation.XMLSchemaFactory.setProperty(Unknown Source)
        at com.sun.xml.bind.v2.util.XmlFactory.allowExternalAccess(XmlFactory.java:236)
        at com.sun.tools.xjc.reader.xmlschema.parser.SchemaConstraintChecker.check(SchemaConstraintChecker.java:87)


[DEBUG] [SchemaGen]: May 02, 2019 5:49:09 PM com.sun.xml.bind.v2.util.XmlFactory allowExternalDTDAccess
CONFIG: Property "http://javax.xml.XMLConstants/property/accessExternalDTD" is not supported by used JAXP implementation.
org.xml.sax.SAXNotRecognizedException: Property 'http://javax.xml.XMLConstants/property/accessExternalDTD' is not recognized.
        at org.apache.xerces.jaxp.validation.XMLSchemaFactory.setProperty(Unknown Source)
        at com.sun.xml.bind.v2.util.XmlFactory.allowExternalDTDAccess(XmlFactory.java:267)
        at com.sun.tools.xjc.reader.xmlschema.parser.SchemaConstraintChecker.check(SchemaConstraintChecker.java:110)

I did all the necessary changes in the jaxp.propterties file in my JRE/lib folder. This is the content of the property file. I have stored it in C:\Program Files\Java\jdk1.8.0_181\jre\lib. That is what maven is using.

javax.xml.accessExternalSchema=all
javax.xml.accessExternalDTD=all

Is this actually an error or can be ignored?

Are you behind some firewall or need a proxy ? Can you call the urls from the browser or curl them ? — Stefan Höltker, May 02 '19 at 12:33
I am in a corporate network. So yes to the firewall. And proxy is a yes too! — hell_storm2004, May 02 '19 at 13:04
Do you setup your proxy settings in your ```settings.xml``` ? — Stefan Höltker, May 02 '19 at 13:28
Yes i have the proxy setup in the settings.xml, the usual way. Sorry cant paste it here as it says too long. — hell_storm2004, May 02 '19 at 13:42
Do you got a multi module project? Maybe the jaxb plugin is corrupt removing the proxy settings as explained here https://github.com/mojohaus/jaxb2-maven-plugin/issues/60 ? — Stefan Höltker, May 02 '19 at 14:22
Ok. I see... Do you mean just delete the repository folder and remove the proxy and try doing a build again? — hell_storm2004, May 03 '19 at 10:03
No, first of all ist your project calling the jaxb plugin anytime before you reach your error ? Maybe some other xjc ? Seems like the plugin removes the proxy while this process temp. — Stefan Höltker, May 03 '19 at 10:07
Oh...No at this point of time I am trying to build the project in isolation, so I dont think XJC is called from anywhere else! But I will give what you did a try and report back! — hell_storm2004, May 03 '19 at 10:17

accessExternalSchema is not recognized

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