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From Chris Wolf <cwolf.a...@gmail.com>
Subject Re: 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 01:58:44 GMT
José,

Thanks for your reply.  My pom.xml setup is very similar to yours and
the "enhance" goal  runs without error, but, as I mentioned,
I still get the error on "casting java.util.HashSet".   Are you able
to persist entities with 1-M or M-M relationships?

BTW, I changed my code to temporarily change JPA provider from OpenJPA
to the Hibernate JPA provider
and, once again, Hibernate's JPA reports:

Exception in thread "main" java.lang.IllegalArgumentException: Unknown
entity: java.util.HashSet
	at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:671)

Well, at least both JPA implementations are complaining about the same
issue - I just wish I knew
what I was doing!   I know I can get this to work in an instant by
reverting to Hibernate-only
solution, but I was hoping the byte-code weaving of JPA would be a
performance advantage over
Hibernate's reflection/proxy pattern.

Thanks again,

    -Chris

On Sun, Nov 18, 2012 at 1:26 PM, José Luis Cetina <maxtorzito@gmail.com> wrote:
> I have this in my pom.xml for ENHANCMENT and works:
>
> <!--OPENJPA ENHANCMENT-->
>             <plugin>
>                 <groupId>org.apache.openjpa</groupId>
>                 <artifactId>openjpa-maven-plugin</artifactId>
>                 <version>2.2.0</version>
>                 <configuration>
>                     <includes>mypackage/model/*.class</includes>
>                     <addDefaultConstructor>true</addDefaultConstructor>
>
> <enforcePropertyRestrictions>true</enforcePropertyRestrictions>
>
> <connectionDriverName>com.mysql.jdbc.Driver</connectionDriverName>
>                     <connectionProperties>
>                         driverClass=${database.driver.name},
>                         jdbcUrl=${database.connection.url},
>                         user=${database.user},
>                         password=${database.password},
>                         minPoolSize=5,
>                         acquireRetryAttempts=3,
>                         maxPoolSize=20
>                     </connectionProperties>
>                 </configuration>
>                 <executions>
>                     <execution>
>                         <id>enhancer</id>
>                         <phase>process-classes</phase>
>                         <goals>
>                             <goal>enhance</goal>
>                         </goals>
>                     </execution>
>                 </executions>
>                 <dependencies>
>                     <dependency>
>                         <groupId>org.apache.openjpa</groupId>
>                         <artifactId>openjpa</artifactId>
>                         <version>2.2.0</version>
>                     </dependency>
>                 </dependencies>
>             </plugin>
>
> In my persistence.xml i have:
>
>      <property name="openjpa.ConnectionUserName" value="${db.username}"/>
>       <property name="openjpa.ConnectionPassword" value="${db.password}"/>
>       <property name="openjpa.ConnectionURL" value="${db.url}"/>
>       <property name="openjpa.ConnectionDriverName"
> value="${db.driver.class}"/>
>
> You can replace the database properties in persistence.xml with your own
> values (${db.username},${db.password},${db.url},${db.driver.class}).
>
>
> I use this configuration for my JEE Projects.
>
> Maybe this can help you.
>
> Regards.
>
> SCJA. JL Cetina
>
>
> 2012/11/18 Chris Wolf <cwolf.algo@gmail.com>
>
>> I wrote a shell script to directly invoke PCEnhancer on class
>> java.util.HashSet,
>> and even that didn't work:
>>
>> $ ./enhance.sh
>> 52  openjpa  INFO   [main] openjpa.Tool - Enhancer running on type
>> "java.util.HashSet".
>> Exception in thread "main" java.lang.RuntimeException:
>> java.io.FileNotFoundExcep
>> tion: file:\C:\opt\jdk\jre\lib\rt.jar!\java\util\HashSet.class (The
>> filename, directory name, or volume label syntax is incorrect)
>>         at
>> org.apache.openjpa.lib.conf.Configurations.launchRunnable(Configurations.java:744)
>>
>> On Sun, Nov 18, 2012 at 10:37 AM, Chris Wolf <cwolf.algo@gmail.com> wrote:
>> > 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-EntityManagerFactory-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.html#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
>>
>
>
>
> --
> -------------------------------------------------------------------
> *SCJA. José Luis Cetina*
> -------------------------------------------------------------------

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