Problem detecting parent's access type with runtime enhancement.
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Key: OPENJPA-34
URL: http://issues.apache.org/jira/browse/OPENJPA-34
Project: OpenJPA
Issue Type: Bug
Reporter: Michael Dick
Priority: Minor
Attachments: employee-project.zip
I have a small hierarchy of entities specified in an xml descriptor (orm.xml),
Employee, PartTimeEmployee and FullTimeEmployee. PartTimeEmployee and
FullTimeEmployee extend Employee which is a MappedSuperclass.
If I don't explicitly set the access type for either PartTimeEmployee or
FullTimeEmployee in orm.xml and I use the static enhancer
(org.apache.openjpa.enhance.PCEnhancer) everything works fine. If I use
runtime enhancement I get a warning like this :
184 INFO [main] openjpa.MetaData - Found 3 classes with metadata in 7
milliseconds.
88 INFO [main] openjpa.Runtime - Starting OpenJPA 0.0.0
180 INFO [main] openjpa.jdbc.JDBC - Using dictionary class
"org.apache.openjpa.jdbc.sql.DerbyDictionary".
277 INFO [main] openjpa.MetaData - Found 4 classes with metadata in 1
milliseconds.
985 INFO [main] openjpa.MetaData - Parsing resource
"file:/home/mikedd/workspaces/openjpa/mdd/target/classes/META-INF/orm.xml".
1307 INFO [main] openjpa.MetaData - Parsing class
"mdd.entities.descriptor.Employee".
1356 INFO [main] openjpa.MetaData - Parsing class
"mdd.entities.descriptor.Employee".
1356 INFO [main] openjpa.MetaData - Parsing package
"mdd.entities.descriptor.Employee".
1385 INFO [main] openjpa.MetaData - Parsing class
"mdd.entities.descriptor.PartTimeEmployee".
1385 INFO [main] openjpa.MetaData - Parsing class
"mdd.entities.descriptor.PartTimeEmployee".
1389 INFO [main] openjpa.MetaData - Parsing class
"mdd.entities.descriptor.FullTimeEmployee".
1390 INFO [main] openjpa.MetaData - Parsing class
"mdd.entities.descriptor.FullTimeEmployee".
1394 INFO [main] openjpa.MetaData - Parsing class
"mdd.entities.descriptor.AbstractPersonnel".
1422 WARN [main] openjpa.Enhance - An exception was thrown while attempting
to perform class file transformation on
"mdd/entities/descriptor/FullTimeEmployee":
<4|false|0.0.0> org.apache.openjpa.util.UserException: Detected the following
possible violations of the restrictions placed on property access persistent
types:
The member for for persistent property
"mdd.entities.descriptor.FullTimeEmployee.salary" was not a method: "private
float mdd.entities.descriptor.FullTimeEmployee.salary".
at
org.apache.openjpa.enhance.PCEnhancer.processViolations(PCEnhancer.java:520)
at org.apache.openjpa.enhance.PCEnhancer.run(PCEnhancer.java:287)
at
org.apache.openjpa.enhance.PCClassFileTransformer.transform(PCClassFileTransformer.java:122)
at
sun.instrument.TransformerManager.transform(TransformerManager.java:141)
at
sun.instrument.InstrumentationImpl.transform(InstrumentationImpl.java:174)
at java.lang.ClassLoader.defineClassImpl(Native Method)
>From what I can tell after running the debugger the error occurs because the
>runtime enhancer isn't able to find the parent's metadata (and from that the
>access type).
I don't think the spec is very clear in this regard. Access isn't a required
attribute for entities, but the spec doesn't indicate what should happen if it
isn't present (or if it does I didn't find it).
I don't know whether this is a limitation of runtime enhancement (again I
didn't see it documented anywhere, but maybe I didn't look hard enough). There
are also plenty of solutions, specifying a default access type in orm.xml, or
just adding access="PROPERTY" to the entity will work.
If it's not an architectural limitation though, I think we should try to get
runtime enhancement to work in the same manner as static enhancement.
In case it helps here's my javaagent setting :
-javaagent:/home/mikedd/.m2/repository/org/apache/openjpa/openjpa-kernel-5/0.9.0-SNAPSHOT/openjpa-kernel-5-0.9.0-SNAPSHOT.jar=scanDevPath=true,MetaDataFactory=jpa
I've attached the source that I've used to produce the problem, include the
eclipse .project and .classpath files (you'll probably have to update these).
There's also a pom.xml which can be used to compile or at least set up the
classpath in eclipse. I don't know how to toggle between runtime and static
enhancement with maven so I haven't used it to run the tests.
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