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Subject: NPE at RelationToManyInverseKeyFieldStrategy when using mappedBy
 inverse
Date: Wed, 30 Apr 2008 17:07:26 +0200
Message-ID: <12D996978341E849B21C51CC97F4771DB4115B@mail3.oams.com>
Thread-Topic: NPE at RelationToManyInverseKeyFieldStrategy when using mappedBy
 inverse
Thread-Index: Aciqza0vAvlmE5XmS66z8ylvjJuUvwABfFTw
From: "Michael Vorburger" <mvorburger@odyssey-group.com>
To: <users@openjpa.apache.org>,
	"dev@openjpa.apache.org" <'dev@openjpa.apache.org'>

Hello,
=20
I'm=20running=20into=20an=20NPE=20in=20RelationToManyInverseKeyFieldStrate=
gy
(copy/pasted=20below)=20when=20using=20an=20OneToMany=20inverse=20relation=
=20with
mappedBy=20and=20InheritanceType.TABLE_PER_CLASS=20in=201.1.0-SNAPSHOT...

Test=20summary:=20A=20common=20abstract=20superclass=20Translatable=20whic=
h=20has=20a
@OneToManySet<Translation>,=20and=20many=20subclasses=20of=20that=20like=20=
e.g.=20a
SomethingTranslatable,=20and=20many=20more.=20=20The=20idea=20is=20that=20=
mapping=20should
lead=20to=20a=20Translation=20table=20holding=20the=20items=20for=20Someth=
ingTranslatable
and=20all=20other=20superclasses.=20=20Then=20SomethingTranslatable=20and=20=
many=20other
tables=20(no=20physical=20Translatable=20table).=20=20There=20shouldn't=20=
be=20a=20join
table=20for=20each=20SomethingTranslatable,=20as=20it's=20a=20OneToManySet=
,=20it=20doesn't
make=20sense,=20so=20the=20owning=20side=20is=20a=20@ManyToOne=20in=20Tran=
slation=20back=20to
Translatable.=20=20Granted=20a=20physical=20FK=20will=20not=20be=20possibl=
e=20in=20such=20a
schema=20-=20accepted,=20but=20it=20should=20still=20be=20possible=20to=20=
map=20this?=20=20It
works=20until=20I=20use=20@Inheritance(strategy=20=3D
InheritanceType.TABLE_PER_CLASS)=20on=20Translatable,=20with=20it=20-=20bo=
um,=20NPE.

I=20have=20a=20standalone=20example=20(test)=20demonstrating=20this=20that=
=20I=20can=20put
into=20a=20JIRA=20if=20anybody=20wants=20to=20have=20a=20look=20(it=20does=
n't=20make=20it=20through
list,=20or=20spam=20filter).

Work-around=20may=20be=20to=20use=20a=20an=20InheritanceType.JOINED=20on=20=
the
Translatable,=20which=20avoids=20the=20NPE=20(tested);=20and=20which=20in=20=
this=20exaxmple
only=20leads=20to=20a=20basically=20empty=20physical=20Translatable=20(but=
=20allows
physical=20FK).=20=20In=20the=20real-world=20example=20this=20is=20based=20=
on=20though,=20where
the=20Translatable=20has=20more=20attributes=20(e.g.=20a=20kind=20of
shortDefaultTranslation=20and=20longDefaultTranslation),=20and=20the=20rea=
l
SomethingTranslatable=20are=20more=20complex,=20this=20leads=20to=20a=20lo=
t=20of=20joins
across=20a=20table=20hiearchy=20which=20we'd=20like=20to=20avoid.

Am=20I=20doing=20something=20wrong?=20=20Not=20possible?=20=20Bug?=20=20Op=
en=20a=20JIRA?

Thanks=20for=20any=20idea,=20hints,=20things=20to=20try,=20etc.!

_____________________________
Michael=20Vorburger,=20Odyssey=20Financial=20Technologies

___
Exception=20in=20thread=20"main"=20java.lang.NullPointerException=20=20at
org.apache.openjpa.jdbc.meta.strats.RelationToManyInverseKeyFieldStrateg
y.map(RelationToManyInverseKeyFieldStrategy.java:136)
=20at
org.apache.openjpa.jdbc.meta.strats.RelationCollectionInverseKeyFieldStr
ategy.map(RelationCollectionInverseKeyFieldStrategy.java:95)
=20at
org.apache.openjpa.jdbc.meta.FieldMapping.setStrategy(FieldMapping.java:
120)
=20at
org.apache.openjpa.jdbc.meta.RuntimeStrategyInstaller.installStrategy(Ru
ntimeStrategyInstaller.java:80)
=20at
org.apache.openjpa.jdbc.meta.FieldMapping.resolveMapping(FieldMapping.ja
va:438)
=20at
org.apache.openjpa.jdbc.meta.FieldMapping.resolve(FieldMapping.java:403)
=20at
org.apache.openjpa.jdbc.meta.ClassMapping.resolveMapping(ClassMapping.ja
va:812)
=20at
org.apache.openjpa.meta.ClassMetaData.resolve(ClassMetaData.java:1626)
=20at
org.apache.openjpa.meta.MetaDataRepository.processBuffer(MetaDataReposit
ory.java:717)
=20at
org.apache.openjpa.meta.MetaDataRepository.resolveMapping(MetaDataReposi
tory.java:677)
=20at
org.apache.openjpa.meta.MetaDataRepository.resolve(MetaDataRepository.ja
va:555)
=20at
org.apache.openjpa.meta.MetaDataRepository.getMetaData(MetaDataRepositor
y.java:308)
=20at
org.apache.openjpa.jdbc.meta.MappingRepository.getMapping(MappingReposit
ory.java:284)
=20at
org.apache.openjpa.jdbc.meta.MappingTool.getMapping(MappingTool.java:676
)
=20at
org.apache.openjpa.jdbc.meta.MappingTool.buildSchema(MappingTool.java:74
8)
=20at=20org.apache.openjpa.jdbc.meta.MappingTool.run(MappingTool.java:646)=

=20at=20org.apache.openjpa.jdbc.meta.MappingTool.run(MappingTool.java:1072=
)
=20at=20org.apache.openjpa.jdbc.meta.MappingTool.run(MappingTool.java:986)=

=20at=20atest.CreateDBTest.synchronizeDatabase(CreateDBTest.java:70)
=20at=20atest.CreateDBTest.testCreateDerbyDB(CreateDBTest.java:31)
=20at=20atest.CreateDBTest.main(CreateDBTest.java:35)


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