stardog connection to server using java

[Cong Wang]

Hi, 

It seems the newest version of stardog isn't compatible with the manual. I was trying to connect server in java, but failed.

" String aServerUrl = "http://localhost:5820";

  Connection aConn = ConnectionConfiguration.to("myDB").server(aServerUrl).credentials("admin", "admin").connect();"

By doing above, it returns error with 

"Exception in thread "main" com.complexible.stardog.StardogException: No driver was found which supports the connection string: 'http://localhost:5820/myDB', please double-check the URL and verify the protocol is correct and try again."

I am very sure I have started the server from command line and the store name is correct. 

Then, i tried to start server in java directly (of course i stopped the server already)

By doing, "Server aServer = Stardog.buildServer().bind(SNARLProtocol.EMBEDDED_ADDRESS).start();",  however the newest version doesn't contain stardog class at all, it was in com.complexible.stardog. 

So, any suggestion? how should I do with the newest stardog? 

Any helps are appreciated.

[Mike Grove]

On Wed, Feb 4, 2015 at 1:09 PM, Cong Wang <joshu...@gmail.com> wrote:

Hi, 

It seems the newest version of stardog isn't compatible with the manual. I was trying to connect server in java, but failed.

" String aServerUrl = "http://localhost:5820";

  Connection aConn = ConnectionConfiguration.to("myDB").server(aServerUrl).credentials("admin", "admin").connect();"

By doing above, it returns error with 

"Exception in thread "main" com.complexible.stardog.StardogException: No driver was found which supports the connection string: 'http://localhost:5820/myDB', please double-check the URL and verify the protocol is correct and try again."

That indicates you're missing the jar files which contain the implementation of the HTTP protocol.  You should double check your classpath to verify that you've included them.

 

I am very sure I have started the server from command line and the store name is correct. 

Then, i tried to start server in java directly (of course i stopped the server already)

By doing, "Server aServer = Stardog.buildServer().bind(SNARLProtocol.EMBEDDED_ADDRESS).start();",  however the newest version doesn't contain stardog class at all, it was in com.complexible.stardog. 

Again, this sounds like you're missing jar files in your classpath; the Stardog class is present in all recent versions of Stardog.

Cheers,

Mike

 

So, any suggestion? how should I do with the newest stardog? 

Any helps are appreciated.

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[Cong Wang]

Hi Mike,

I had figured it out. Thanks. 

One more question, after i load about 2 million triples and run some test sparql queries, my RAM is used about 2.3g. Is there anyway to flush these cache when i don't need to query, but still need open the server. 

Thanks. 

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Cong Wang
Ph.D Candidate,
Kno.e.sis Center,
Wright State University.

[Mike Grove]

On Thu, Feb 5, 2015 at 1:13 PM, Cong Wang <joshu...@gmail.com> wrote:

Hi Mike,

I had figured it out. Thanks. 

One more question, after i load about 2 million triples and run some test sparql queries, my RAM is used about 2.3g. Is there anyway to flush these cache when i don't need to query, but still need open the server. 

Thanks. 

We start the JVM with 2G by default, you can reduce that number if you need to.

Cheers,

Mike