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.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#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
