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From José Luis Cetina <maxtorz...@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 Sun, 18 Nov 2012 18:26:20 GMT
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
>



-- 
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*SCJA. José Luis Cetina*
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