Re: [Neo4j] An attempt at documenting the internals and architecture of Neo
On Mon, Oct 18, 2010 at 11:57 PM, Peter Neubauer peter.neuba...@neotechnology.com wrote: Chris, great reading your blogs on this! Did you get on with the transaction piece yet? In case you need info, don't hesitate to ask here on the list, there are a number of folks that have disected the area before :) Also, when it comes to Neo4j working with other TX managers in a JTA environment like JOTM and Atomikos, I hope we will be able at least to start with failing tests in these environments in the next iteration and beginning with that, start working around the issues that JTA is leaving for non-relational stores like Neo4j. There might be some details that you are interested in when digging there :) Cheers, /peter neubauer Peter, thanks for your input. The transaction handling code is the aspect of a db that I am least familiar with from an implementation standpoint, so it took a bit more time than I had planned. I have come through, however, wiser and ready to write about it in what will in all probability be more than one post. Soon :) As for JTA support, it is one of the reasons I started my documentation efforts and I would like to see neo working in a JTA/JTS environment. But first I have to write about XALogicalLog and its friends. Stay tuned. cheers, CG ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] More PHP and REST goodness on the way
Hi Peter, I'll see if I can get me, Jake, and Olle all on board to finish the refactoring and merge back with the original branch. Functionally the PHP client works and is ready. We'd like to add unit tests and better organize the code. How about the REST api? Any word on whether the path algos will be included in an upcoming release? That and traversals are probably the most useful parts of the PHP client. Thanks, Todd -- MIKAMAI | Making Media Social http://mikamai.com +447868260229 ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
[Neo4j] unit testing
Hello, I am interested in neo4j unit testing. I founded this conversation in archive, and this looks interesting, but I failed to find function setup() to override. What class should i look for ? best, Nikola You can also create the graph on a temp folder and remove it overriding setup() on a base class. That's how we do it for our unit tests. 2010/2/10 Thomas Andersson greddbul...@gmail.com: Hi, Is it possible to run neo4j in memory only, that is, without a directory in the file system? ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] unit testing
Hi Nikola, I happen to be adding an example unit-test to the next release. Hold on a minute and I'll pass along a sneak preview. Cheers, Andreas On Oct 19, 2010, at 2:39 PM, nikola sijakinjic wrote: Hello, I am interested in neo4j unit testing. I founded this conversation in archive, and this looks interesting, but I failed to find function setup() to override. What class should i look for ? best, Nikola You can also create the graph on a temp folder and remove it overriding setup() on a base class. That's how we do it for our unit tests. 2010/2/10 Thomas Andersson greddbul...@gmail.com: Hi, Is it possible to run neo4j in memory only, that is, without a directory in the file system? ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] An attempt at documenting the internals and architecture of Neo
Chris, I've really enjoyed those posts on neo4j internals. Looking forward to the next. -- Toby Matejovsky On Tue, Oct 19, 2010 at 6:10 AM, Chris Gioran chris.gio...@gmail.comwrote: On Mon, Oct 18, 2010 at 11:57 PM, Peter Neubauer peter.neuba...@neotechnology.com wrote: Chris, great reading your blogs on this! Did you get on with the transaction piece yet? In case you need info, don't hesitate to ask here on the list, there are a number of folks that have disected the area before :) Also, when it comes to Neo4j working with other TX managers in a JTA environment like JOTM and Atomikos, I hope we will be able at least to start with failing tests in these environments in the next iteration and beginning with that, start working around the issues that JTA is leaving for non-relational stores like Neo4j. There might be some details that you are interested in when digging there :) Cheers, /peter neubauer Peter, thanks for your input. The transaction handling code is the aspect of a db that I am least familiar with from an implementation standpoint, so it took a bit more time than I had planned. I have come through, however, wiser and ready to write about it in what will in all probability be more than one post. Soon :) As for JTA support, it is one of the reasons I started my documentation efforts and I would like to see neo working in a JTA/JTS environment. But first I have to write about XALogicalLog and its friends. Stay tuned. cheers, CG ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] unit testing
Hi Nikola,
Below is a baseline for unit testing neo4j. Please let me know if you have any
ideas for helpers that would make writing tests easier. It might be useful to
pull together a package of base classes and maybe hamcrest matchers that are
common to all testing.
Cheers,
Andreas
package org.neo4j.examples;
import org.junit.*;
import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Transaction;
import org.neo4j.kernel.EmbeddedGraphDatabase;
import java.io.File;
import static org.hamcrest.Matchers.greaterThan;
import static org.hamcrest.Matchers.is;
import static org.junit.Assert.assertThat;
/**
* An example of unit testing with Neo4j.
*/
public class Neo4jBaseTest
{
/**
* Base directory for temporary database.
*/
protected File testDirectory = new File( target/var );
/**
* Full path to the temporary database.
*/
protected File testDatabasePath = new File( testDirectory, testdb );
protected GraphDatabaseService graphDb;
/**
* Create temporary database for each unit test.
* p/
* This will delete any existing database prior to creating a new one.
*/
@Before
public void prepareTestDatabase()
{
deleteFileOrDirectory( testDatabasePath );
graphDb = new EmbeddedGraphDatabase( testDatabasePath.getAbsolutePath()
);
}
/**
* Shutdown the database.
*/
@After
public void destroyTestDatabase()
{
graphDb.shutdown();
}
protected void deleteFileOrDirectory( File path )
{
if ( path.exists() )
{
if ( path.isDirectory() )
{
for ( File child : path.listFiles() )
{
deleteFileOrDirectory( child );
}
}
path.delete();
}
}
@Test
public void shouldCreateNode()
{
Transaction tx = graphDb.beginTx();
Node n = null;
try
{
n = graphDb.createNode();
n.setProperty( name, Nancy );
tx.success();
} catch ( Exception e )
{
tx.failure();
} finally
{
tx.finish();
}
// The node should have an id greater than 0, which is the id of the
reference node.
assertThat( n.getId(), is( greaterThan( 0l ) ) );
// Retrieve a node by using the id of the created node. The id's and
property should match.
Node foundNode = graphDb.getNodeById( n.getId() );
assertThat( foundNode.getId(), is( n.getId() ) );
assertThat( (String) foundNode.getProperty( name ), is( Nancy ) );
}
}
On Oct 19, 2010, at 2:39 PM, nikola sijakinjic wrote:
Hello,
I am interested in neo4j unit testing. I founded this conversation in
archive, and this looks interesting, but I failed to find function setup()
to override.
What class should i look for ?
best,
Nikola
You can also create the graph on a temp folder and remove it
overriding setup() on a base class.
That's how we do it for our unit tests.
2010/2/10 Thomas Andersson greddbul...@gmail.com:
Hi,
Is it possible to run neo4j in memory only, that is, without a
directory in the file system?
___
Neo4j mailing list
User@lists.neo4j.org
https://lists.neo4j.org/mailman/listinfo/user
___
Neo4j mailing list
User@lists.neo4j.org
https://lists.neo4j.org/mailman/listinfo/user
[Neo4j] Questions about Neo4j vs Hadoop
After reading the article on highscalability I have a few questions about it: 1. You're saying that matching data on the client side in for example Java would be slow. Are you just talking about skipping multiple round trips to the server, since the matching should take as long on the server as on the client, no? 2. If that is the case could you solve the same problem by implementing a server side method, in for example HBase, that did something similar so you only would need one round trip? 3. For the billions of entries mentioned in the post, what kind of hardware are you guys using? Thanks Erik ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
[Neo4j] hi.
hi! I find a good website：www.ebisri.com On this website ,you can find many new and origianl electronic products .Now they are holding sales promotion activity, all the product are sold at a low cost and good quality ,and the delivery is on time . It is a good chance that you should not lose. If you need some, visit this website . Let us enjoy the happiness of shopping. Greetings! ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] unit testing
Hi Andreas,
thank you for your effort ! But I am looking for a way to detach neo4j
completely from file system. What I understood from thread below, there is a
way to start neo4j so it works only in memory, creating no files, so there
is no need to delete db files with every test run.
Best,
Nikola
On Tue, Oct 19, 2010 at 4:25 PM, Andreas Kollegger
andreas.kolleg...@neotechnology.com wrote:
Hi Nikola,
Below is a baseline for unit testing neo4j. Please let me know if you have
any ideas for helpers that would make writing tests easier. It might be
useful to pull together a package of base classes and maybe hamcrest
matchers that are common to all testing.
Cheers,
Andreas
package org.neo4j.examples;
import org.junit.*;
import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Transaction;
import org.neo4j.kernel.EmbeddedGraphDatabase;
import java.io.File;
import static org.hamcrest.Matchers.greaterThan;
import static org.hamcrest.Matchers.is;
import static org.junit.Assert.assertThat;
/**
* An example of unit testing with Neo4j.
*/
public class Neo4jBaseTest
{
/**
* Base directory for temporary database.
*/
protected File testDirectory = new File( target/var );
/**
* Full path to the temporary database.
*/
protected File testDatabasePath = new File( testDirectory, testdb );
protected GraphDatabaseService graphDb;
/**
* Create temporary database for each unit test.
* p/
* This will delete any existing database prior to creating a new one.
*/
@Before
public void prepareTestDatabase()
{
deleteFileOrDirectory( testDatabasePath );
graphDb = new EmbeddedGraphDatabase(
testDatabasePath.getAbsolutePath() );
}
/**
* Shutdown the database.
*/
@After
public void destroyTestDatabase()
{
graphDb.shutdown();
}
protected void deleteFileOrDirectory( File path )
{
if ( path.exists() )
{
if ( path.isDirectory() )
{
for ( File child : path.listFiles() )
{
deleteFileOrDirectory( child );
}
}
path.delete();
}
}
@Test
public void shouldCreateNode()
{
Transaction tx = graphDb.beginTx();
Node n = null;
try
{
n = graphDb.createNode();
n.setProperty( name, Nancy );
tx.success();
} catch ( Exception e )
{
tx.failure();
} finally
{
tx.finish();
}
// The node should have an id greater than 0, which is the id of the
reference node.
assertThat( n.getId(), is( greaterThan( 0l ) ) );
// Retrieve a node by using the id of the created node. The id's and
property should match.
Node foundNode = graphDb.getNodeById( n.getId() );
assertThat( foundNode.getId(), is( n.getId() ) );
assertThat( (String) foundNode.getProperty( name ), is( Nancy )
);
}
}
On Oct 19, 2010, at 2:39 PM, nikola sijakinjic wrote:
Hello,
I am interested in neo4j unit testing. I founded this conversation
in
archive, and this looks interesting, but I failed to find function
setup()
to override.
What class should i look for ?
best,
Nikola
You can also create the graph on a temp folder and remove it
overriding setup() on a base class.
That's how we do it for our unit tests.
2010/2/10 Thomas Andersson greddbul...@gmail.com:
Hi,
Is it possible to run neo4j in memory only, that is, without a
directory in the file system?
___
Neo4j mailing list
User@lists.neo4j.org
https://lists.neo4j.org/mailman/listinfo/user
___
Neo4j mailing list
User@lists.neo4j.org
https://lists.neo4j.org/mailman/listinfo/user
___
Neo4j mailing list
User@lists.neo4j.org
https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] unit testing
Hi Nikola,
Ah, I see. Unfortunately there is no way to avoid any file creation. The lowest
file access would be to never commit a transaction.
Are you interested in easier unit-testing, or are you interested in in-memory
to have all the graph semantics without being persistent?
Cheers,
Andreas
On Oct 19, 2010, at 4:55 PM, nikola sijakinjic wrote:
Hi Andreas,
thank you for your effort ! But I am looking for a way to detach neo4j
completely from file system. What I understood from thread below, there is a
way to start neo4j so it works only in memory, creating no files, so there
is no need to delete db files with every test run.
Best,
Nikola
On Tue, Oct 19, 2010 at 4:25 PM, Andreas Kollegger
andreas.kolleg...@neotechnology.com wrote:
Hi Nikola,
Below is a baseline for unit testing neo4j. Please let me know if you have
any ideas for helpers that would make writing tests easier. It might be
useful to pull together a package of base classes and maybe hamcrest
matchers that are common to all testing.
Cheers,
Andreas
package org.neo4j.examples;
import org.junit.*;
import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Transaction;
import org.neo4j.kernel.EmbeddedGraphDatabase;
import java.io.File;
import static org.hamcrest.Matchers.greaterThan;
import static org.hamcrest.Matchers.is;
import static org.junit.Assert.assertThat;
/**
* An example of unit testing with Neo4j.
*/
public class Neo4jBaseTest
{
/**
* Base directory for temporary database.
*/
protected File testDirectory = new File( target/var );
/**
* Full path to the temporary database.
*/
protected File testDatabasePath = new File( testDirectory, testdb );
protected GraphDatabaseService graphDb;
/**
* Create temporary database for each unit test.
* p/
* This will delete any existing database prior to creating a new one.
*/
@Before
public void prepareTestDatabase()
{
deleteFileOrDirectory( testDatabasePath );
graphDb = new EmbeddedGraphDatabase(
testDatabasePath.getAbsolutePath() );
}
/**
* Shutdown the database.
*/
@After
public void destroyTestDatabase()
{
graphDb.shutdown();
}
protected void deleteFileOrDirectory( File path )
{
if ( path.exists() )
{
if ( path.isDirectory() )
{
for ( File child : path.listFiles() )
{
deleteFileOrDirectory( child );
}
}
path.delete();
}
}
@Test
public void shouldCreateNode()
{
Transaction tx = graphDb.beginTx();
Node n = null;
try
{
n = graphDb.createNode();
n.setProperty( name, Nancy );
tx.success();
} catch ( Exception e )
{
tx.failure();
} finally
{
tx.finish();
}
// The node should have an id greater than 0, which is the id of the
reference node.
assertThat( n.getId(), is( greaterThan( 0l ) ) );
// Retrieve a node by using the id of the created node. The id's and
property should match.
Node foundNode = graphDb.getNodeById( n.getId() );
assertThat( foundNode.getId(), is( n.getId() ) );
assertThat( (String) foundNode.getProperty( name ), is( Nancy )
);
}
}
On Oct 19, 2010, at 2:39 PM, nikola sijakinjic wrote:
Hello,
I am interested in neo4j unit testing. I founded this conversation
in
archive, and this looks interesting, but I failed to find function
setup()
to override.
What class should i look for ?
best,
Nikola
You can also create the graph on a temp folder and remove it
overriding setup() on a base class.
That's how we do it for our unit tests.
2010/2/10 Thomas Andersson greddbul...@gmail.com:
Hi,
Is it possible to run neo4j in memory only, that is, without a
directory in the file system?
___
Neo4j mailing list
User@lists.neo4j.org
https://lists.neo4j.org/mailman/listinfo/user
___
Neo4j mailing list
User@lists.neo4j.org
https://lists.neo4j.org/mailman/listinfo/user
___
Neo4j mailing list
User@lists.neo4j.org
https://lists.neo4j.org/mailman/listinfo/user
___
Neo4j mailing list
User@lists.neo4j.org
https://lists.neo4j.org/mailman/listinfo/user
[Neo4j] Lucene result sorting
Hi, Is it possible to do get sorted results form LuceneIndex#query()? It would be really helpful if results would be sorted at lucene time according to one or more indexed fields rather than loading the actual neo4j nodes and than iterating over them for sorting. Currently, it seems that sorting is not supported by LuceneIndex, but are there plans regarding this? Thanks for any hints, --- balazs ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] unit testing
For easier unit testing, I could imagine two approaches: 1) providing a few
base classes that provide methods for creating/shutting down a temporary graph
database, and maybe @Before/@After type annotation; 2) a
TemporaryGraphDatabaseService which manages itself.
For #2, I'm imagining use like:
@Test public void shouldUseATemporaryGraph() {
GraphDatabaseService graphdb = new TemporaryGraphDatabaseService();
// do stuff with the graph, including managing transactions
...
// that's it. No explicit shutdown. The TemporaryGraphDatabaseService()
should politely clean up after itself during finalization.
}
Initial implementations for both approaches would use the system temp area to
create files.
Not too bad, right?
Cheers,
Andreas
On Oct 19, 2010, at 5:43 PM, nikola sijakinjic wrote:
Are you interested in easier unit-testing, or are you interested in
in-memory to have all the graph semantics without being persistent?
I want it all :)) at this moment I am more interested in easy unit testing,
but looking forward to see neo4j in-memory release. Thank you for your fast
reply.
Cheers,
Nikola
Cheers,
Andreas
On Oct 19, 2010, at 4:55 PM, nikola sijakinjic wrote:
Hi Andreas,
thank you for your effort ! But I am looking for a way to detach neo4j
completely from file system. What I understood from thread below, there
is a
way to start neo4j so it works only in memory, creating no files, so
there
is no need to delete db files with every test run.
Best,
Nikola
On Tue, Oct 19, 2010 at 4:25 PM, Andreas Kollegger
andreas.kolleg...@neotechnology.com wrote:
Hi Nikola,
Below is a baseline for unit testing neo4j. Please let me know if you
have
any ideas for helpers that would make writing tests easier. It might be
useful to pull together a package of base classes and maybe hamcrest
matchers that are common to all testing.
Cheers,
Andreas
package org.neo4j.examples;
import org.junit.*;
import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Transaction;
import org.neo4j.kernel.EmbeddedGraphDatabase;
import java.io.File;
import static org.hamcrest.Matchers.greaterThan;
import static org.hamcrest.Matchers.is;
import static org.junit.Assert.assertThat;
/**
* An example of unit testing with Neo4j.
*/
public class Neo4jBaseTest
{
/**
* Base directory for temporary database.
*/
protected File testDirectory = new File( target/var );
/**
* Full path to the temporary database.
*/
protected File testDatabasePath = new File( testDirectory, testdb );
protected GraphDatabaseService graphDb;
/**
* Create temporary database for each unit test.
* p/
* This will delete any existing database prior to creating a new one.
*/
@Before
public void prepareTestDatabase()
{
deleteFileOrDirectory( testDatabasePath );
graphDb = new EmbeddedGraphDatabase(
testDatabasePath.getAbsolutePath() );
}
/**
* Shutdown the database.
*/
@After
public void destroyTestDatabase()
{
graphDb.shutdown();
}
protected void deleteFileOrDirectory( File path )
{
if ( path.exists() )
{
if ( path.isDirectory() )
{
for ( File child : path.listFiles() )
{
deleteFileOrDirectory( child );
}
}
path.delete();
}
}
@Test
public void shouldCreateNode()
{
Transaction tx = graphDb.beginTx();
Node n = null;
try
{
n = graphDb.createNode();
n.setProperty( name, Nancy );
tx.success();
} catch ( Exception e )
{
tx.failure();
} finally
{
tx.finish();
}
// The node should have an id greater than 0, which is the id of
the
reference node.
assertThat( n.getId(), is( greaterThan( 0l ) ) );
// Retrieve a node by using the id of the created node. The id's
and
property should match.
Node foundNode = graphDb.getNodeById( n.getId() );
assertThat( foundNode.getId(), is( n.getId() ) );
assertThat( (String) foundNode.getProperty( name ), is( Nancy
)
);
}
}
On Oct 19, 2010, at 2:39 PM, nikola sijakinjic wrote:
Hello,
I am interested in neo4j unit testing. I founded this conversation
in
archive, and this looks interesting, but I failed to find function
setup()
to override.
What class should i look for ?
best,
Nikola
You can also create the graph on a temp folder and remove it
overriding setup() on a base class.
That's how we do it for our unit tests.
2010/2/10 Thomas Andersson greddbul...@gmail.com:
Hi,
Is it possible to run neo4j in memory only, that is, without a
directory in the file system?
___
Neo4j mailing list
User@lists.neo4j.org
Re: [Neo4j] Lucene result sorting
Hi Balazs, We've been working on a new lucene-index module just these last days. The new index module allows sorting, through the QueryContext-class. You can look in svn https://svn.neo4j.org/components/lucene-index/trunk/, if you are so inclined, or wait for the next milestone release (Thursday). HTH, Andrés On Tue, Oct 19, 2010 at 5:41 PM, Balazs E. Pataki pat...@dsd.sztaki.huwrote: Hi, Is it possible to do get sorted results form LuceneIndex#query()? It would be really helpful if results would be sorted at lucene time according to one or more indexed fields rather than loading the actual neo4j nodes and than iterating over them for sorting. Currently, it seems that sorting is not supported by LuceneIndex, but are there plans regarding this? Thanks for any hints, --- balazs ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Lucene result sorting
2010/10/19 Andres Taylor andres.tay...@neotechnology.com
Hi Balazs,
We've been working on a new lucene-index module just these last days. The
new index module allows sorting, through the QueryContext-class. You can
look in svn https://svn.neo4j.org/components/lucene-index/trunk/, if you
are so inclined, or wait for the next milestone release (Thursday).
Exactly, an example could be:
IndexNode myNodeIndex = ...
for ( Node hit : myNodeIndex.query(
new QueryContext( name:Balazs ).sort( name ) ) ) {
System.out.println( hit.getProperty( name ) );
}
HTH,
Andrés
On Tue, Oct 19, 2010 at 5:41 PM, Balazs E. Pataki pat...@dsd.sztaki.hu
wrote:
Hi,
Is it possible to do get sorted results form LuceneIndex#query()?
It would be really helpful if results would be sorted at lucene time
according to one or more indexed fields rather than loading the actual
neo4j nodes and than iterating over them for sorting.
Currently, it seems that sorting is not supported by LuceneIndex, but
are there plans regarding this?
Thanks for any hints,
---
balazs
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--
Mattias Persson, [matt...@neotechnology.com]
Hacker, Neo Technology
www.neotechnology.com
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[Neo4j] Neo4j-rdf and Jpype
Hi all,
Relatively new to Jpype, and encountering some issues.
I'm trying to make Neo4j a triple store by loading some RDF data. Looked at
some documentation and found the following Java example to initialize the store:
GraphDatabaseService graphDb = new EmbeddedGraphDatabase(target/var/examples
);
IndexService indexService = new LuceneIndexService( graphDb );
RdfStore rdfStore = new VerboseQuadStore( graphDb, indexService );
Sail sail = new GraphDatabaseSail( graphDb, rdfStore );
Transforming it into JPype, I came up with the following:
import jpype
import os
JAVA_EXT_DIRS = os.path.join(os.path.abspath('.'), 'lib') #folder lib
contains all jars, including jars I created for neo4j-rdf, neo4j-rdf-sail and
neo4j-rdf-sparql
jpype.startJVM(jpype.getDefaultJVMPath(), -Djava.ext.dirs=%s % JAVA_EXT_DIRS)
EmbeddedGraphDatabase = jpype.JClass(org.neo4j.kernel.EmbeddedGraphDatabase)
LuceneIndexService = jpype.JClass(org.neo4j.index.lucene.LuceneIndexService)
VerboseQuadStore = jpype.JClass(org.neo4j.rdf.store.VerboseQuadStore)
-- This is where I run into trouble. When I try to run the
VerboseQuadStore command, I run into a Class Not Found exception. I tried
creating different classes from the same JAR (like Uri, or RDFStoreImpl) and I
do not encounter the same issues. Only with VerboseQuadStore.
Wondering what I am doing wrong (or if there is a standard / known way of doing
this using JPype).
Thanks much!
Karen
Karen Joy Nomorosa
Semantic Analyst
REARDEN COMMERCE
1051 E Hillsdale Blvd, Sixth Floor
Foster City CA 94404
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Re: [Neo4j] Neo4j-rdf and Jpype
Hi Karen,
Have you looked into neo4j.py?
It abstracts a lot of the stuff away and should get you up an
running fairly quick.
Cheers,
Vasco
Bueda, Inc
On Tue, Oct 19, 2010 at 3:25 PM, Karen Nomorosa
karen.nomor...@reardencommerce.com wrote:
Hi all,
Relatively new to Jpype, and encountering some issues.
I'm trying to make Neo4j a triple store by loading some RDF data. Looked at
some documentation and found the following Java example to initialize the
store:
GraphDatabaseService graphDb = new
EmbeddedGraphDatabase(target/var/examples );
IndexService indexService = new LuceneIndexService( graphDb );
RdfStore rdfStore = new VerboseQuadStore( graphDb, indexService );
Sail sail = new GraphDatabaseSail( graphDb, rdfStore );
Transforming it into JPype, I came up with the following:
import jpype
import os
JAVA_EXT_DIRS = os.path.join(os.path.abspath('.'), 'lib') #folder lib
contains all jars, including jars I created for neo4j-rdf, neo4j-rdf-sail and
neo4j-rdf-sparql
jpype.startJVM(jpype.getDefaultJVMPath(), -Djava.ext.dirs=%s %
JAVA_EXT_DIRS)
EmbeddedGraphDatabase = jpype.JClass(org.neo4j.kernel.EmbeddedGraphDatabase)
LuceneIndexService = jpype.JClass(org.neo4j.index.lucene.LuceneIndexService)
VerboseQuadStore = jpype.JClass(org.neo4j.rdf.store.VerboseQuadStore)
-- This is where I run into trouble. When I try to run the
VerboseQuadStore command, I run into a Class Not Found exception. I tried
creating different classes from the same JAR (like Uri, or RDFStoreImpl) and
I do not encounter the same issues. Only with VerboseQuadStore.
Wondering what I am doing wrong (or if there is a standard / known way of
doing this using JPype).
Thanks much!
Karen
Karen Joy Nomorosa
Semantic Analyst
REARDEN COMMERCE
1051 E Hillsdale Blvd, Sixth Floor
Foster City CA 94404
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Vasco Calais Pedro
Founder/CEO
Bueda
412.880.7785
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Re: [Neo4j] Neo4j-rdf and Jpype
Yes, neo4j.py does abstract away a lot of this hassle, but it does not (yet)
provide an abstraction for the RDF component.
I tried to retrace your steps, but I am not able to reproduce your error, so
I don't really know what might be going wrong for you. It could be that you
are missing a jar file in the ext-dir that contains some class that
VerboseQuadStore depends on (and needs to be able to load), this means that
the Class Not Found exception you see is not about not
finding VerboseQuadStore, it's about not finding some other class. I don't
really know what that would be though.
For reference, here is what I put in my ext-dir, and the jpype interaction
where I verified that it worked:
$ ls target/dependency/
geronimo-jta_1.1_spec-1.1.1.jar
lucene-core-2.9.2.jar
lucene-highlighter-2.9.1.jar
lucene-memory-2.9.1.jar
neo4j-graph-matching-0.8-SNAPSHOT.jar
neo4j-index-1.1-SNAPSHOT.jar
neo4j-kernel-1.1-SNAPSHOT.jar
neo4j-meta-model-0.9-SNAPSHOT.jar
neo4j-rdf-0.7-SNAPSHOT.jar
neo4j-shell-1.1-SNAPSHOT.jar
neo4j-utils-1.1-SNAPSHOT.jar
$ python
Python 2.6.1 (r261:67515, Feb 11 2010, 00:51:29)
[GCC 4.2.1 (Apple Inc. build 5646)] on darwin
Type help, copyright, credits or license for more information.
import jpype, os
jpype.startJVM(jpype.getDefaultJVMPath(), -Djava.ext.dirs= +
os.path.abspath(target/dependency))
jpype.JClass(org.neo4j.rdf.store.VerboseQuadStore)
class 'jpype._jclass.org.neo4j.rdf.store.VerboseQuadStore'
Cheers,
Tobias
On Tue, Oct 19, 2010 at 9:32 PM, Vasco Pedro va...@bueda.com wrote:
Hi Karen,
Have you looked into neo4j.py?
It abstracts a lot of the stuff away and should get you up an
running fairly quick.
Cheers,
Vasco
Bueda, Inc
On Tue, Oct 19, 2010 at 3:25 PM, Karen Nomorosa
karen.nomor...@reardencommerce.com wrote:
Hi all,
Relatively new to Jpype, and encountering some issues.
I'm trying to make Neo4j a triple store by loading some RDF data. Looked
at some documentation and found the following Java example to initialize the
store:
GraphDatabaseService graphDb = new
EmbeddedGraphDatabase(target/var/examples );
IndexService indexService = new LuceneIndexService( graphDb );
RdfStore rdfStore = new VerboseQuadStore( graphDb, indexService );
Sail sail = new GraphDatabaseSail( graphDb, rdfStore );
Transforming it into JPype, I came up with the following:
import jpype
import os
JAVA_EXT_DIRS = os.path.join(os.path.abspath('.'), 'lib') #folder
lib contains all jars, including jars I created for neo4j-rdf,
neo4j-rdf-sail and neo4j-rdf-sparql
jpype.startJVM(jpype.getDefaultJVMPath(), -Djava.ext.dirs=%s %
JAVA_EXT_DIRS)
EmbeddedGraphDatabase =
jpype.JClass(org.neo4j.kernel.EmbeddedGraphDatabase)
LuceneIndexService =
jpype.JClass(org.neo4j.index.lucene.LuceneIndexService)
VerboseQuadStore = jpype.JClass(org.neo4j.rdf.store.VerboseQuadStore)
-- This is where I run into trouble. When I try to run the
VerboseQuadStore command, I run into a Class Not Found exception. I tried
creating different classes from the same JAR (like Uri, or RDFStoreImpl) and
I do not encounter the same issues. Only with VerboseQuadStore.
Wondering what I am doing wrong (or if there is a standard / known way of
doing this using JPype).
Thanks much!
Karen
Karen Joy Nomorosa
Semantic Analyst
REARDEN COMMERCE
1051 E Hillsdale Blvd, Sixth Floor
Foster City CA 94404
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Vasco Calais Pedro
Founder/CEO
Bueda
412.880.7785
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--
Tobias Ivarsson tobias.ivars...@neotechnology.com
Hacker, Neo Technology
www.neotechnology.com
Cellphone: +46 706 534857
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