Exception in thread "main" com.complexible.stardog.StardogException: connection refused

[Jonathan Zhou]

Hi,

I am just starting to try StarDog. I was running a very simple program below:

Connection aConn = ConnectionConfiguration.to("waldoTest1")

.credentials("admin", "admin").connect();

aConn.begin();

aConn.add()

.io()

.format(RDFFormat.N3)

.stream(new FileInputStream(

"C:/data/stardog/examples/data/sp2b_10k.n3"));

Graph aGraph = Graphs.newGraph(ValueFactoryImpl.getInstance()

.createStatement(

ValueFactoryImpl.getInstance().createURI("urn:subj"),

ValueFactoryImpl.getInstance().createURI("urn:pred"),

ValueFactoryImpl.getInstance().createURI("urn:obj")));

Resource aContext = ValueFactoryImpl.getInstance().createURI(

"urn:test:context");

aConn.add().graph(aGraph, aContext);

aConn.commit();

aConn.close();

But the system threw out the exception that connection to the database was refused. The database has been built and I can see it on web console. What has caused this issue?

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".

SLF4J: Defaulting to no-operation (NOP) logger implementation

SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.

Exception in thread "main" com.complexible.stardog.StardogException: connection refused

at com.complexible.stardog.protocols.snarl.client.SNARLDriver.connect(SNARLDriver.java:130)

at com.complexible.stardog.api.DriverManager.getConnection(DriverManager.java:72)

at com.complexible.stardog.api.ConnectionConfiguration.connect(ConnectionConfiguration.java:137)

at com.yyt.core.kb.TestConnection.main(TestConnection.java:34)

Caused by: java.net.ConnectException: connection refused

at com.complexible.common.protocols.client.rpc.DefaultRPCClient.<init>(DefaultRPCClient.java:129)

at com.complexible.stardog.protocols.snarl.client.SNARLClientImpl.<init>(SNARLClientImpl.java:92)

at com.complexible.stardog.protocols.snarl.client.SNARLClientImpl$$FastClassByGuice$$b2f20e06.newInstance(<generated>)

at com.google.inject.internal.cglib.reflect.$FastConstructor.newInstance(FastConstructor.java:40)

at com.google.inject.internal.DefaultConstructionProxyFactory$1.newInstance(DefaultConstructionProxyFactory.java:60)

at com.google.inject.internal.ConstructorInjector.construct(ConstructorInjector.java:85)

at com.google.inject.internal.ConstructorBindingImpl$Factory.get(ConstructorBindingImpl.java:254)

at com.google.inject.internal.InjectorImpl$4$1.call(InjectorImpl.java:978)

at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1024)

at com.google.inject.internal.InjectorImpl$4.get(InjectorImpl.java:974)

at com.google.inject.assistedinject.FactoryProvider2.invoke(FactoryProvider2.java:632)

at com.sun.proxy.$Proxy11.createClient(Unknown Source)

at com.complexible.stardog.protocols.snarl.client.SNARLDriver.connect(SNARLDriver.java:113)

... 3 more

Thanks!

[Mike Grove]

On Tue, Jul 22, 2014 at 10:19 AM, Jonathan Zhou <zhouch...@gmail.com> wrote:

Hi,

I am just starting to try StarDog. I was running a very simple program below:

Connection aConn = ConnectionConfiguration.to("waldoTest1")

.credentials("admin", "admin").connect();

You are not specifying a server URL [1], so by default, the client will attempt to connect to the embedded server, which is probably not running since you mention using the web console.

You have to tell the client where the database server is located in order for it to establish a connection.

Cheers,

Mike

[1] http://docs.stardog.com/java/snarl/com/complexible/stardog/api/ConnectionConfiguration.html#server(java.lang.String)

 

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[Jonathan Zhou]

Michael, I just figured out. Thanks!

在 2014年7月22日星期二UTC-4上午10时23分22秒，Michael Grove写道：