question: public String queryCatalogClassName ( ) { String className = System . getProperty ( pClassname ) ; if ( className == null ) { if ( resources == null ) readProperties ( ) ; if ( resources == null ) return null ; try { return resources . getString ( "catalog-class-name" ) ; } catch ( MissingResourceException e ) { return null ; } } return className ; }
target:  Obtain the Catalog class name setting from the properties.