Yeah sorry about that :)
Bottom line is, EmbeddedReadOnlyGraphDb works.
It only displays the `lucene index not found error` when the database(path)
is already in use by another program. Otherwise it just works.
I should've said this, it's simpler to understand.
To answer your question, I was trying to see if it worked to use the same
database(path) when using EmbeddedReadOnlyGraphDb, while I understood it
doesn't work when using EmbeddedGraphDatabase. Result: it doesn't work.
But the noticed difference is, when using EmbeddedGraphDatabase the
exception is this:
Exception in thread "main" org.neo4j.graphdb.TransactionFailureException:
Could not create data source [nioneodb], see nested exception for cause of
error
at
org.neo4j.kernel.impl.transaction.TxModule.registerDataSource(TxModule.java:153)
at org.neo4j.kernel.GraphDbInstance.start(GraphDbInstance.java:111)
at
org.neo4j.kernel.EmbeddedGraphDbImpl.<init>(EmbeddedGraphDbImpl.java:189)
at
org.neo4j.kernel.EmbeddedGraphDatabase.<init>(EmbeddedGraphDatabase.java:86)
at
org.neo4j.kernel.EmbeddedGraphDatabase.<init>(EmbeddedGraphDatabase.java:63)
at
org.neo4j.examples.CalculateShortestPath.main(CalculateShortestPath.java:53)
Caused by: java.lang.IllegalStateException: Unable to lock store
[neo4j-shortest-path\neostore], this is usually a result of some other Neo4j
kernel running usi
ng the same store.
at
org.neo4j.kernel.impl.nioneo.store.CommonAbstractStore.checkStorage(CommonAbstractStore.java:266)
at
org.neo4j.kernel.impl.nioneo.store.CommonAbstractStore.<init>(CommonAbstractStore.java:169)
at
org.neo4j.kernel.impl.nioneo.store.AbstractStore.<init>(AbstractStore.java:120)
at org.neo4j.kernel.impl.nioneo.store.NeoStore.<init>(NeoStore.java:65)
at
org.neo4j.kernel.impl.nioneo.xa.NeoStoreXaDataSource.<init>(NeoStoreXaDataSource.java:134)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
at
org.neo4j.kernel.impl.transaction.XaDataSourceManager.create(XaDataSourceManager.java:76)
at
org.neo4j.kernel.impl.transaction.TxModule.registerDataSource(TxModule.java:147)
... 5 more
but when using EmbeddedReadOnlyGraphDatabase, the exception is this instead:
Exception in thread "main" java.lang.IllegalArgumentException: No index
provider 'lucene' found
at
org.neo4j.kernel.IndexManagerImpl.getIndexProvider(IndexManagerImpl.java:76)
at
org.neo4j.kernel.IndexManagerImpl.getOrCreateNodeIndex(IndexManagerImpl.java:269)
at org.neo4j.kernel.IndexManagerImpl.forNodes(IndexManagerImpl.java:255)
at org.neo4j.kernel.IndexManagerImpl.forNodes(IndexManagerImpl.java:249)
at
org.neo4j.examples.CalculateShortestPath.main(CalculateShortestPath.java:54)
that is what I was attempting to say in the previous xD
Regards ;)
On Thu, Jul 21, 2011 at 6:16 AM, Michael Hunger <
[email protected]> wrote:
> If you run into errors, please make sure to include the exceptions in the
> e-mail.
>
> Verbal descriptions are sometimes hard to follow without having the code
> and the environment.
>
> You mean you take the same program and exchange the code line to use
> EmbeddedReadOnlyGraphDb ?
>
> Why do you do that? Why don't you create a second program that uses
> EmbeddedReadOnlyGraphDb, you can't
> do modifying operations anyway.
>
> Cheers
>
> Michael
>
> Am 21.07.2011 um 06:12 schrieb cyuczi eekc:
>
> > It is not necessary however your reply made me retest, and it works as it
> > were, but it only shows that error, if, I run the program with
> > EmbeddedGraphDatabase and put it in an 100 second sleep(so that it keeps
> the
> > database open), and then I change it to EmbeddedReadOnlyGraphDatabase and
> > run it again as second program (while first is already running as
> > EmbeddedGraphDatabase). In this case, this second program shows that
> error.
> > If I run both programs with EmbeddedReadOnlyGraphDatabase, the exact
> thing
> > happens :)
> > I guess it's the way the second program complains that the index (and/or
> > the database, since it's in the same path) is already in use by the first
> > program.
> >
> > On Thu, Jul 21, 2011 at 6:03 AM, Michael Hunger <
> > [email protected]> wrote:
> >
> >> Probably you have to add that for the other project too ?
> >>
> >> Am 21.07.2011 um 05:57 schrieb cyuczi eekc:
> >>
> >>> Thanks Michael, that is good to know...
> >>> I would've tried that right now, for tests, but unfortunately I get
> that
> >>> silly error "No index provider 'lucene' found", but only when using
> >>> EmbeddedReadOnlyGraphDatabase, not EmbeddedGraphDatabase. Perhaps it
> >> would
> >>> be worth mentioning that in order to not get the error for
> >>> EmbeddedGraphDatabase, I had to add the folder
> >>> ".\lucene-index\src\main\resources\" to classpath, since I am not using
> >> any
> >>> .jars, instead I'm using the source files directly from github (in
> >> eclipse)
> >>>
> >>> regarding my topic, I am reading this currently:
> >>> http://wiki.neo4j.org/content/Using_the_Neo4j_Server_with_Java
> >>> but it seems a bit messy, so I will probably limit myself to using
> >> embedded
> >>> database for now :)
> >>>
> >>>
> >>>
> >>> On Thu, Jul 21, 2011 at 5:44 AM, Michael Hunger <
> >>> [email protected]> wrote:
> >>>
> >>>> If you want to have a "read-only-snapshot" view of the database you
> can
> >>>> also use
> >>>>
> >>>> new EmbeddedReadOnlyGraphDatabase(path);
> >>>>
> >>>> Cheers
> >>>>
> >>>> Michael
> >>>>
> >>>> Am 21.07.2011 um 05:31 schrieb Jim Webber:
> >>>>
> >>>>> Hi Cyuczi,
> >>>>>
> >>>>> You can't open the same database twice in two programs. If you want
> >> data
> >>>> to be replicated between Neo4j instances, look into HA:
> >>>>>
> >>>>> http://docs.neo4j.org/chunked/stable/ha-how.html
> >>>>> http://wiki.neo4j.org/content/High_Availability_Cluster
> >>>>>
> >>>>> Jim
> >>>>> _______________________________________________
> >>>>> Neo4j mailing list
> >>>>> [email protected]
> >>>>> https://lists.neo4j.org/mailman/listinfo/user
> >>>>
> >>>> _______________________________________________
> >>>> Neo4j mailing list
> >>>> [email protected]
> >>>> https://lists.neo4j.org/mailman/listinfo/user
> >>>>
> >>> _______________________________________________
> >>> Neo4j mailing list
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> >>
> >> _______________________________________________
> >> Neo4j mailing list
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> >>
> > _______________________________________________
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