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From MiƂosz <mtyle...@o2.pl>
Subject Re: "collection-valued-path" ArgumentException when querying based on multi-valued elements in an XML column
Date Mon, 14 Dec 2009 21:44:44 GMT
Hi,

I guess this is an OpenJPA limitation - only queries over single-valued elements are supported.
There is a section on XML mapping in the user manual [1].

Regards,
Milosz

[1] http://openjpa.apache.org/builds/latest/docs/manual/manual.html#ref_guide_xmlmapping


> Hi,
> 
> I am having trouble executing a JPA named query that uses multi-valued
> elements, within an XML column, as criteria.
> 
> I have a table with the following DB2 schema:
> CREATE TABLE SWD.Dummy (
>         dummyId VARCHAR(32) NOT NULL,
>         properties XML  NOT NULL
>     )
>     DATA CAPTURE NONE;
> 
> ALTER TABLE SWD.Dummy ADD CONSTRAINT Dummy_PK PRIMARY KEY (dummyId);
> 
> and I used JAXB to generate the beans for marshalling & unmarshalling from
> the XSD schema defined for the "properties" XML column. My XSD schema is as
> follows:
> 
> <?xml version="1.0" encoding="utf-8"?>
> <xsd:schema version="1.0" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
>     <xsd:element name="properties" type="propertiesType" />
>     <xsd:complexType name="propertiesType">
>         <xsd:sequence>
>             <xsd:element maxOccurs="unbounded" name="property"
> type="propertyType" />
>         </xsd:sequence>
>     </xsd:complexType>
>     <xsd:complexType name="propertyType">
>         <xsd:sequence>
>             <xsd:element name="keyy" type="xsd:string" />
>             <xsd:element name="valuee" type="xsd:string" />
>         </xsd:sequence>
>     </xsd:complexType>
> </xsd:schema>
> 
>  In summary, the element "properties" is the root element and it contains
> any number of "property" elements which in turn may contain "keyy" and
> "valuee" string elements. An example of an XML compliant with the schema:
> 
> <?xml version="1.0" encoding="UTF-16"
> ?><properties><property><keyy>abc</keyy><valuee>123</valuee></property><property><keyy>def</keyy><valuee>xyz</valuee></property></properties>
> 
> 
> 
> I am able to use JPA to make simple queries on the Dummy entity. However, I
> get an error if I try to query on the "property" element.
> For example, I get an exception if I execute the following JPQL query:
> SELECT d FROM Dummy d, IN (d.properties.property) p WHERE p.keyy=:keyy AND
> p.valuee=:valuee
> 
> The stack trace that I get is:
> com.example.DAOException: <openjpa-2.0.0-M3-r422266:822833 nonfatal user
> error> org.apache.openjpa.persistence.ArgumentException:
> collection-valued-path
>     at com.example.DummyDAO.findDummyByProperty(DummyDAO.java:142)
>     at com.example.GetDummyService.invoke(GetDummyService.java:63)
>     ... 32 more
> Caused by:
> <openjpa-2.0.0-M3-r422266:822833 nonfatal user error>
> org.apache.openjpa.persistence.ArgumentException: collection-valued-path
>     at
> org.apache.openjpa.kernel.exps.AbstractExpressionBuilder.traverseXPath(AbstractExpressionBuilder.java:269)
>     at
> org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder.getPath(JPQLExpressionBuilder.java:1921)
>     at
> org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder.addJoin(JPQLExpressionBuilder.java:741)
>     at
> org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder.evalFromClause(JPQLExpressionBuilder.java:680)
>     at
> org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder.evalFromClause(JPQLExpressionBuilder.java:666)
>     at
> org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder.getQueryExpressions(JPQLExpressionBuilder.java:292)
>     at org.apache.openjpa.kernel.jpql.JPQLParser.eval(JPQLParser.java:67)
>     at
> org.apache.openjpa.kernel.ExpressionStoreQuery$DataStoreExecutor.<init>(ExpressionStoreQuery.java:728)
>     at
> org.apache.openjpa.kernel.ExpressionStoreQuery.newDataStoreExecutor(ExpressionStoreQuery.java:170)
>     at
> org.apache.openjpa.kernel.QueryImpl.createExecutor(QueryImpl.java:742)
>     at
> org.apache.openjpa.kernel.QueryImpl.compileForDataStore(QueryImpl.java:700)
>     at
> org.apache.openjpa.kernel.QueryImpl.compileForExecutor(QueryImpl.java:682)
>     at org.apache.openjpa.kernel.QueryImpl.compile(QueryImpl.java:582)
>     at
> com.ibm.ws.persistence.EntityManagerImpl.createNamedQuery(EntityManagerImpl.java:104)
>     at
> com.ibm.ws.persistence.EntityManagerImpl.createNamedQuery(EntityManagerImpl.java:36)
>     at
> com.ibm.ws.jpa.management.JPATxEmInvocation.createNamedQuery(JPATxEmInvocation.java:116)
>     at
> com.ibm.ws.jpa.management.JPAEntityManager.createNamedQuery(JPAEntityManager.java:332)
>     at com.example.DummyDAO.findDummyByProperty(DummyDAO.java:137)
>     ... 33 more
> 
> I've tweaked the query many times, but am unable to get it working. I
> couldn't find resources online regarding this either, so I would greatly
> appreciate any help on this, thank you!


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