import com.sun.xml.internal.bind.v2.model.annotation.RuntimeInlineAnnotationReader; //导入依赖的package包/类
public JAXBContextImpl build() throws JAXBException {

            // fool-proof
            if (this.defaultNsUri == null) {
                this.defaultNsUri = "";
            }

            if (this.subclassReplacements == null) {
                this.subclassReplacements = Collections.emptyMap();
            }

            if (this.annotationReader == null) {
                this.annotationReader = new RuntimeInlineAnnotationReader();
            }

            if (this.typeRefs == null) {
                this.typeRefs = Collections.<TypeReference>emptyList();
            }

            return new JAXBContextImpl(this);
        }