Tests shouldn't depend on http://schemas.deegree.org

[copierrj]

http://schemas.deegree.org is being used in unit tests. This is causing problems when:

• the server is down
• PR makes changes in the schema files

[stephanr]

I think the current handling intended to only use the local xsd schema files for building, so no online dependecy is required.
See https://github.com/deegree/deegree3/blob/master/pom.xml#L86

[stephanr]

As a temporary resolve can be adding a classpath resulition by addin a dependecy to this code:

public class CatalogResolver extends com.sun.org.apache.xml.internal.resolver.tools.CatalogResolver {

    public String getResolvedEntity( String publicId, String systemId ) {
        System.err.println( "*** DEEGREE RESOLVER - getResolvedEntity ***" );
        System.err.println( "publicId: " + publicId );
        System.err.println( "systemId: " + systemId );

        if ( systemId != null && systemId.toLowerCase().startsWith( "http://schemas.deegree.org/" ) ) {
            String newid = "META-INF/schemas/" + systemId.substring( 27 );
            System.err.println( "trying: " + newid );
            try {
                URL resource = Thread.currentThread().getContextClassLoader().getResource( newid );
                System.err.println( "Found: " + resource );
                if ( resource == null ) {
                    resource = getClass().getResource( "/" + newid );
                }
                if ( resource != null ) {
                    System.err.println( "Using local schema file: " + resource );
                    return resource.toString();
                }
            } catch ( Exception ex ) {
                System.err.println( "Error: " + ex.getMessage() );
            }
        }

        return super.getResolvedEntity( publicId, systemId );
    }
}

[copierrj]

Using version 0.12.0 of maven-jaxb2-plugin should be used eventually.

Perhaps we could leverage the dependency plugin (to extract xsd's from other artifacts) and the 'schemaDirectory' option of jaxb plugin?

[copierrj]

related issue: #731