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https://issues.apache.org/jira/browse/OPENJPA-2403?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13757769#comment-13757769
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Albert Lee commented on OPENJPA-2403:
-------------------------------------
The original exception is complaining the id class NOT the entity class not
having a public no-arg constructor.
Here are the sections in the spec defining the requirements that a composite
primary key MUST have a public no-arg constructor.
====================
2.1 The Entity Class
The entity class must have a no-arg constructor. The entity class may have
other constructors as well.
The no-arg constructor must be public or protected.
2.4 Primary Keys and Entity Identity
A composite primary key must correspond to either a single persistent field or
property or to a
set of such fields or properties as described below. A primary key class must
be defined to represent
a composite primary key. Composite primary keys typically arise when mapping
from
legacy databases when the database key is comprised of several columns. The
EmbeddedId
or IdClass annotation is used to denote a composite primary key.
The following rules apply for composite primary keys:
• The primary key class must be public and must have a public no-arg
constructor.
2.5 Embeddable Classes
Embeddable classes must adhere to the requirements specified in Section 2.1 for
entities....
> Enhancer yields "does not have a public no-args constructor." exception for
> entity with protected qualified constructor
> -----------------------------------------------------------------------------------------------------------------------
>
> Key: OPENJPA-2403
> URL: https://issues.apache.org/jira/browse/OPENJPA-2403
> Project: OpenJPA
> Issue Type: Bug
> Components: Enhance
> Affects Versions: 2.0.3, 2.1.2, 2.3.0, 2.2.3
> Reporter: Albert Lee
> Assignee: Albert Lee
> Attachments: OPENJPA-2403.patch
>
>
> Entity with protected qualified constructor:
> @Entity
> public class Kunde {
> ....
> protected Kunde() {
> // jpa constructor
> }
> ....
> }
> causes enhancer to fail with message like:
> C:\>wsenhancer test\Kun*.class
> 82 ConstructorDemoWeb INFO [main] openjpa.Tool - Enhancer running on type
> "class at.arz.domain.core.Kunde".
> Exception in thread "main" <openjpa-2.2.3-SNAPSHOT-r422266:1485013 fatal user
> error> org.apache.openjpa.util.MetaDataException: The id class "class
> test.Kundennummer"
> specified by type "class test.Kunde" does not have a public no-args
> constructor.
> at
> org.apache.openjpa.meta.ClassMetaData.validateAppIdClassMethods(ClassMetaData.java:2161)
> at
> org.apache.openjpa.meta.ClassMetaData.validateAppIdClass(ClassMetaData.java:2067)
> at
> org.apache.openjpa.meta.ClassMetaData.validateIdentity(ClassMetaData.java:2034)
> at
> org.apache.openjpa.meta.ClassMetaData.validateMeta(ClassMetaData.java:1946)
> at
> org.apache.openjpa.meta.ClassMetaData.resolve(ClassMetaData.java:1807)
> at
> org.apache.openjpa.meta.MetaDataRepository.processBuffer(MetaDataRepository.java:828)
> at
> org.apache.openjpa.meta.MetaDataRepository.resolveMeta(MetaDataRepository.java:725)
> at
> org.apache.openjpa.meta.MetaDataRepository.resolve(MetaDataRepository.java:649)
> at
> org.apache.openjpa.meta.MetaDataRepository.getMetaDataInternal(MetaDataRepository.java:417)
> at
> org.apache.openjpa.meta.MetaDataRepository.getMetaData(MetaDataRepository.java:388)
> at org.apache.openjpa.enhance.PCEnhancer.<init>(PCEnhancer.java:286)
> at org.apache.openjpa.enhance.PCEnhancer.run(PCEnhancer.java:4885)
> at org.apache.openjpa.enhance.PCEnhancer.run(PCEnhancer.java:4831)
> at org.apache.openjpa.enhance.PCEnhancer$1.run(PCEnhancer.java:4801)
> at
> org.apache.openjpa.lib.conf.Configurations.launchRunnable(Configurations.java:761)
> at
> org.apache.openjpa.lib.conf.Configurations.runAgainstAllAnchors(Configurations.java:751)
> at org.apache.openjpa.enhance.PCEnhancer.run(PCEnhancer.java:4796)
> at org.apache.openjpa.enhance.PCEnhancer.main(PCEnhancer.java:4787)
> Caused by: java.lang.NoSuchMethodException: test.Kundennummer.<init>()
> at java.lang.Class.throwNoSuchMethodException(Class.java:327)
> at java.lang.Class.getConstructor(Class.java:354)
> at
> org.apache.openjpa.meta.ClassMetaData.validateAppIdClassMethods(ClassMetaData.java:2159)
> ... 17 more
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