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BeanUtils uses '.' as a property separator, and the second property should actually used mapped syntax, since it is directly accessing a map now, thus the correct usage should be:
String val = PropertyUtils.getProperty(bean, "map(key1).key2");

Why does it omit some properties when call BeanUtils.describe?

say you get a dto Type through wsimport tools:

package local; import java.io.Serializable; import java.util.ArrayList; import java.util.List; import javax.xml.bind.annotation.XmlAccessType; import javax.xml.bind.annotation.XmlAccessorType; import javax.xml.bind.annotation.XmlAnyElement; import javax.xml.bind.annotation.XmlElement; import javax.xml.bind.annotation.XmlType; import org.w3c.dom.Element;
/**

• Container for data on one listing category.
• <p>Java class for CategoryType complex type.
• <p>The following schema fragment specifies the expected content contained within this class.
• <pre>
• <complexType name="CategoryType">
• <complexContent>
• <restriction base="{http://www.w3.org/2001/XMLSchema\}anyType">
• <sequence>
• <element name="BestOfferEnabled" type="{http://www.w3.org/2001/XMLSchema\}boolean" minOccurs="0"/>
• <any/>
• </sequence>
• </restriction>
• </complexContent>
• </complexType>
• </pre> */

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "CategoryType", propOrder = {
"bestOfferEnabled"
}) public class CategoryType
implements Serializable
{

private final static long serialVersionUID = 12343L;
@XmlElement(name = "BestOfferEnabled")
protected Boolean bestOfferEnabled;

/**

• Gets the value of the bestOfferEnabled property.
• @return
• possible object is
• {@link Boolean }
• */
  public Boolean isBestOfferEnabled() {
  return bestOfferEnabled;
  }
  /**
• Sets the value of the bestOfferEnabled property.
• @param value
• allowed object is
• {@link Boolean }
• */
  public void setBestOfferEnabled(Boolean value) {
  this.bestOfferEnabled = value;
  }
  

}

I run this main method:
	public static void main(String\[\] args)\{
		[CategoryType] type = new [CategoryType]();
		try\{
			System.out.println(BeanUtils.describe(type));
		\}catch(Exception e)\{
			e.printStackTrace();
		\}

}

get this result:
{class=class local.CategoryType}

it omits bestOfferEnabled property.