Actually, mine works just fine!
I choose to annotate the attributes instead of the methodes, but here is an
example:
@Entity
@Table(name = "UserGroup")
public class UserGroup extends BaseEntity {
[snip]
@ManyToMany(mappedBy = "userGroups")
private Set<Users> users;
}
@Entity
@Table(name = "Users")
public class Users extends BaseEntity {
[snip]
@ManyToMany
@JoinTable(name = "UserGroupMember", joinColumns = @JoinColumn(name =
"userid"), inverseJoinColumns = @JoinColumn(name = "groupid"))
private Set<UserGroup> userGroups;
}
> -----Ursprüngliche Nachricht-----
> Von: Chris Wolf [mailto:cwolf.a...@gmail.com]
> Gesendet: Montag, 19. November 2012 16:29
> An: users@openjpa.apache.org
> Betreff: Re: cannot persist m2m data, getting
> "ArgumentException: Attempt to cast instance xxx
> [java.util.HashSet]" to PersistenceCapable failed. Ensure
> that it has been enhanced."
>
> José,
>
> The plugin doc says you can have a comma-delimited list of
> classes, however, since enhancement on collection classes
> doesn't seem to work anyway - per your suggestion, I removed
> "java.util.ArrayList" and re-ran the "mvn openjpa:enhance" command.
>
> The result, as ever, is still:
>
> 771 openjpa INFO [main] openjpa.Enhance - Creating subclass and
> redefining methods for
> "[class java.util.ArrayList]". This means that your
> application will be less efficient than it would if you ran
> the OpenJPA enhancer.
> Exception in thread "main" <openjpa-2.2.0-r422266:1244990
> fatal user error>
> org.apache.openjpa.persistence.ArgumentException: No
> registered metadata for type "class java.util.ArrayList".
> This can happen if this class has not been annotated as a
> persistent entity or specified in the persistence unit (ex:
> in the orm.xml).
>
> I wonder if anyone knows of a working example of many-to-many
> ORM using OpenJPA?
>
> Thanks,
>
> -Chris
>
>
> On Mon, Nov 19, 2012 at 10:19 AM, José Luis Cetina
> <maxtorz...@gmail.com> wrote:
> > And I think you don't have to set arraylist class or any
> java "native"
> > class as enhance class. Only your entities have to be enhancement.
> > El 19/11/2012 09:12, "José Luis Cetina"
> <maxtorz...@gmail.com> escribió:
> >
> >> I'm not sure if the include tag accept more than 1 class.
> >>
> >> You have:
> >> <includes>**/entities/*.class,java.util.ArrayList.class</includes>
> >>
> >> Try to remove java.util.ArrayList.
> >> El 19/11/2012 09:05, "Chris Wolf" <cwolf.a...@gmail.com> escribió:
> >>
> >>> 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
> >>> <maxtorz...@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.a...@gmail.com> escribió:
> >>> >
> >>> >> José,
> >>> >>
> >>> >> I tried List/ArrayList - same error. Thanks....
> >>> >>
> >>> >> -Chris
> >>> >>
> >>> >> On Sun, Nov 18, 2012 at 9:47 PM, José Luis Cetina <
> >>> maxtorz...@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.a...@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(AbstractEntityMa
> >>> nagerImpl.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 <
> >>> maxtorz...@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</enforcePropertyRestrictio
> >>> >> >> > ns>
> >>> >> >> >
> >>> >> >> >
> <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.a...@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(Configurat
> >>> ions.java:744)
> >>> >> >> >>
> >>> >> >> >> On Sun, Nov 18, 2012 at 10:37 AM, Chris Wolf <
> >>> cwolf.a...@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#StaticLoggerBinderfor
> >>> >> >> >> > 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.ja
> >>> >> >> >> > r
> >>> >> >> >> >
> >>> >> >> >> > 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-EntityMan
> >>> agerFactory-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*
> >>> >> >> >
> >>>
> -------------------------------------------------------------------
> >>> >> >>
> >>> >>
> >>>
> >>
>
