openjpa-users mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Boblitz John <John.Bobl...@BERTSCHI.com>
Subject AW: cannot persist m2m data, getting "ArgumentException: Attempt to cast instance xxx [java.util.HashSet]" to PersistenceCapable failed. Ensure that it has been enhanced."
Date Mon, 19 Nov 2012 12:37:09 GMT
Hello Chris,

Just out of curiosity, do you have RiskFactor defined with @Entity?

Maybe a complete listing of the RiskFactor & MarketData might help further ....


John

> -----Urspr√ľngliche Nachricht-----
> Von: Chris Wolf [mailto:cwolf.algo@gmail.com] 
> Gesendet: Sonntag, 18. November 2012 16:37
> An: users@openjpa.apache.org
> Betreff: cannot persist m2m data, getting "ArgumentException: 
> Attempt to cast instance xxx [java.util.HashSet]" to 
> PersistenceCapable failed. Ensure that it has been enhanced."
> 
> Hello,
> 
> This is my first posting and first attempt to use OpenJPA.  I 
> put together a quick demo and can persist individual, 
> unrelated entities.  However, when I try to persist related 
> entities to two tables via a link table, i.e. many-2-many, it 
> keeps complaining about "casting to PersistenceCapable", in 
> particular the class "java.util.HashSet".
> 
> First, I am using the Eclipse JPA plugin (called "Dali" or 
> "EclipseLink").  Of course, I have OpenJPA configured as my 
> JPA provider, I am in a plain Java SE environment with 
> LOCAL_RESOURCE via JDBC connection properties in the 
> persistence.xml.  I am using Sun/Oracle 64bit
> JDK-1.6 and OpenJPA-2.2.0.
> 
> I am using the Eclipse JPA plugin to generate the entity 
> classes from already-exiting database schema objects, and 
> that code looks like (just pasting the relationship code), 
> this action also adds these classes to persistence.xml via 
> persistence-unit/class elements.
> 
> First M2M entity, "MarketData":
> 
> 	//bi-directional many-to-many association to RiskFactor
> 	@ManyToMany(mappedBy="marketData")
> 	public Set<RiskFactor> getRiskFactors() {
> 		return this.riskFactors;
> 	}
> 
> Second M2M entity "RiskFactor":
> 
> 	//bi-directional many-to-many association to MarketData
>     @ManyToMany
> 	@JoinTable(
> 		name="MARKET_DATA__RISK_FACTOR"
> 		, joinColumns={
> 			@JoinColumn(name="RISK_FACTOR_ID", 
> nullable=false)
> 			}
> 		, inverseJoinColumns={
> 			@JoinColumn(name="MARKET_DATA_ID", 
> nullable=false)
> 			}
> 		)
> 	public Set<MarketData> getMarketData() {
> 		return this.marketData;
> 	}
> 
> When I run the code, the log indicates implicit runtime 
> enhacement, yet it is complaining:
> 
> "[persistdemo.ojpa.entities.RiskFactor@61578aab] [java.util.HashSet]"
> to PersistenceCapable failed.  Ensure that it has been enhanced."
> 
> ...when it says, "Ensure that it has been enhanced." - which is "it"
> referring to?  The entity "RiskFactor" or the field 
> relationship field's class, "java.util.HashSet"?
> 
> 
> 186  openjpa  INFO   [main] openjpa.Runtime - OpenJPA dynamically
> loaded the class enhancer. Any classes that were not enhanced 
> at build time will be enhanced when they are loaded by the JVM.
> SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
> SLF4J: Defaulting to no-operation (NOP) logger implementation
> SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder 
> for further details.
> 243  openjpa  INFO   [main] openjpa.Runtime - OpenJPA dynamically
> loaded a validation provider.
> 596  openjpa  INFO   [main] openjpa.Runtime - Starting OpenJPA 2.2.0
> 630  openjpa  INFO   [main] openjpa.jdbc.JDBC - Using dictionary class
> "org.apache.openjpa.jdbc.sql.OracleDictionary".
> Exception in thread "main" <openjpa-2.2.0-r422266:1244990 
> nonfatal user error> 
> org.apache.openjpa.persistence.ArgumentException: Attempt to 
> cast instance "[persistdemo.ojpa.entities.RiskFactor@61578aab]
> [java.util.HashSet]" to PersistenceCapable failed.  Ensure 
> that it has been enhanced.
> 
> Maybe because "java.util.HashSet" was loaded before the 
> dynamic enhancer could get to it?
> 
> Next, I tried performing build-time enhancement via Maven, 
> per this doc:
> http://openjpa.apache.org/enhancement-with-maven.html
> 
> When I ran "mvn openjpa:enhance", it finished with success, 
> but none of the classes in target/classes seemed to have be 
> changed (last-modified date same as compile-time).  and 
> re-running results in the same error and stack-trace.
> 
> My openjpa:enhance configuration was:
> <configuration>
>     <includes>**/entities/*.class,java.util.HashSet</includes>
>      <addDefaultConstructor>true</addDefaultConstructor>
>      <enforcePropertyRestrictions>true</enforcePropertyRestrictions>
> </configuration>
> 
> 
> Next, I tried invoking with:
> 
> -javaagent:/opt/apache-openjpa-2.2.0/openjpa-all-2.2.0.jar
> 
> Same error - same stack trace.
> 
> Then, I tried setting this property:
> openjpa.RuntimeUnenhancedClasses=supported
> 
> Same error - same stack trace.
> 
> 
> Then, following a suggestion I found here:
> http://openjpa.208410.n2.nabble.com/JPA-adding-entities-to-Ent
> ityManagerFactory-programmatically-td210697.html
> 
> I tried setting both:
> openjpa.RuntimeUnenhancedClasses=supported
> openjpa.MetaDataFactory=jpa(Types=java.util.HashSet)
> 
> BTW, this is a dead link
> "User's Guide on Enhancement" /
> http://openjpa.apache.org/builds/latest/docs/manual/manual.htm
> l#ref_guide_pc_enhance
> (from page: http://openjpa.apache.org/entity-enhancement.html)
> 
> So is there any way to use OpenJPA to persist objects related 
> via a link table?  (there obviously must be, but it's a total 
> mystery to me)  I can't believe it's this difficult, I must 
> be doing something really dumb.
> 
> Regards,
> 
> CW
> 
Mime
View raw message