I've got a tree structure of Node objects (Node
extends BaseEntity). Each node can have one parent Node object and many children Node objects. I retrieve this structure from the database with one single HQL select statement ("from Node n"). When i invoke setCacheable(false), the tree structure loads just fine.
However; when i invoke setCacheable(true), i get an IllegalArgumentException telling me that "object is not an instance of declaring class". Strange!
Code:
ERROR BasicPropertyAccessor:167 - IllegalArgumentException in class: com.tracker.db.entities.Node, getter method of property: id
[...]
org.hibernate.PropertyAccessException: IllegalArgumentException occurred calling getter of com.tracker.db.entities.Node.id
[...]
Caused by: java.lang.IllegalArgumentException: object is not an instance of declaring class
I've tried a lot of things to solve this, of which the most "drastic" has been:
(1)
Removed almost all properties besides from the absolutely necessary ones from the mappings document.(2)
Moved all fields from BaseEntity into Node so that Node no longer extends BaseEntity. (3)
Removed fetch join of the children and parent properties in my HQL. However, nothing really solves the problem.
But, somehow the cache must be doing something that makes this go wrong? So, if anyone have any insight to share on this one i would be very, very happy and thankful.
Mapping file and code:
Code:
<hibernate-mapping>
<class name="com.tracker.db.entities.Node" table="keywordnode">
<cache usage="read-write"/>
<id column="id" length="36" name="id" type="com.tracker.db.usertypes.CustomUUID"/>
<version column="updated" name="updated" type="java.util.Calendar" unsaved-value="null"/>
<property column="name" length="200" name="name" type="java.lang.String"/>
<many-to-one name="parent" cascade="none" class="com.tracker.db.entities.Node" column="parent_id"/>
<bag cascade="none" inverse="true" name="children" order-by="name asc">
<cache usage="read-write"/>
<key column="parent_id"/>
<one-to-many class="com.tracker.db.entities.Node"/>
</bag>
</hibernate-mapping>
Code:
Query q = currentSession.createQuery("from Node n left join fetch n.parent left join fetch n.children");
q.setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY);
q.setCacheable(true);
q.list();
Code:
public class BaseEntity implements Serializable {
private java.util.UUID id = null;
private java.util.Calendar updated = null;
public java.util.UUID getId() {}
public void setId(java.util.UUID id) {}
public void setUpdated(java.util.Calendar updated) {}
public java.util.Calendar getUpdated() {}
}
Code:
public class Node extends BaseEntity implements Comparable<Node> {
private String name = "";
private Node parent = null;
private java.util.List children = new java.util.ArrayList();
public String getName() {}
public void setName(String name) {}
public Node getParent() {}
public void setParent(Node parent) {}
public java.util.List getChildren() {}
public void setChildren(java.util.List children) {}
}
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