public DozerBeanMapperBuilder withElementReader(ElementReader elementReader) {
        this.elementReader = elementReader;
        return this;
    }
Registers a {@link ElementReader} for the mapper.
Which can be used to resolve expressions within the defined XML mappings.
<p>
By default, {@link SimpleElementReader} are registered,
unless {@link com.sun.el.ExpressionFactoryImpl} is detected on classpath, then {@link ExpressionElementReader}

@param elementReader elementReader to use
@return modified builder to be further configured.
core/src/main/java/com/github/dozermapper/core/DozerBeanMapperBuilder.java