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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 15:05:09 GMT
José,

Thanks - I sent the two entities to John (this list).  The pom.xml is
attached...

    -Chris



On Mon, Nov 19, 2012 at 9:54 AM, José Luis Cetina <maxtorzito@gmail.com> wrote:
> Please send your 2 entities and your pom configuration whit the enhance
> plugin.
> El 19/11/2012 08:46, "Chris Wolf" <cwolf.algo@gmail.com> escribió:
>
>> José,
>>
>> I tried List/ArrayList - same error.  Thanks....
>>
>>    -Chris
>>
>> On Sun, Nov 18, 2012 at 9:47 PM, José Luis Cetina <maxtorzito@gmail.com>
>> wrote:
>> > Of course I'm using 1-M relationships but I use them with List not
>> hashset,
>> > why you dont give a try to list only for look if the problem is with
>> > hashset.
>> > El 18/11/2012 19:59, "Chris Wolf" <cwolf.algo@gmail.com> escribió:
>> >
>> >> 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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