Hi.
I'm using spinrdf-1.0.2.jar, and I'd like to be able to run it without
any connection to the Internet. Currently that's not possible because
of a typo in the SP.java and SPIN.java source files. These two files
have the following code snippets:
SP.java
======
237 public static Model getModel() {
238 if(model == null) {
239 model = ModelFactory.createDefaultModel
(ReificationStyle.Minimal);
240 InputStream is = SP.class.getClassLoader
().getResourceAsStream("/etc/sp.owl");
SPIN.java
========
102 public static Model getModel() {
103 if(model == null) {
104 model = ModelFactory.createDefaultModel
(ReificationStyle.Minimal);
105 InputStream is =
SPIN.class.getClassLoader().getResourceAsStream
("/etc/spin.owl");
It's the same bug, which appears on line 240 of SP and line 105 of
SPIN. When you call the ClassLoader.getResourceAsStream, you mustn't
use a leading slash, otherwise typical URL handlers such as exist in
Java 1.6 fail to resolve the resource and return null. Some
specialized URL handlers such as the
weblogic.utils.zip.ZipURLConnection class in WebLogic are able to
resolve such a reference, but the standard machinery in Java cannot do
it. The specification of this method is horrendously vague in the
ClassLoader Javadoc, but the bottom line is that it won't work in most
Java environments.
To fix these bugs, I recommend using the different coding pattern that
appears in the SPL.java file, which uses the Class.getResourceAsStream
method instead. That method is far better specified in its Javadoc,
and it succeeds in resolving a resource with a leading slash. Here
are the proper replacement lines for SP.java:240 and SPIN.java:105,
respectively:
240 InputStream is =
SP.class.getResourceAsStream("/etc/sp.owl");
105 InputStream is = SPIN.class.getResourceAsStream("/etc/
spin.owl");
The impact of this bug is that I cannot invoke the SPIN APIs if my
machine has no connection to the Internet. Here's what happens:
======================= BEGIN STACK TRACE OF EXCEPTION
========================
Exception in thread "main" com.hp.hpl.jena.shared.JenaException:
java.net.UnknownHostException: spinrdf.org
at com.hp.hpl.jena.rdf.arp.JenaReader.read(JenaReader.java:91)
at com.hp.hpl.jena.rdf.model.impl.ModelCom.read(ModelCom.java:178)
at org.topbraid.spin.vocabulary.SPIN.getModel(SPIN.java:107)
at org.topbraid.spin.system.SPINModuleRegistry.init
(SPINModuleRegistry.java:113)
at test.Main.main(Main.java:70)
Caused by: java.net.UnknownHostException: spinrdf.org
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance
(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance
(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at sun.net.www.protocol.http.HttpURLConnection$6.run
(HttpURLConnection.java:1368)
at java.security.AccessController.doPrivileged(Native Method)
at sun.net.www.protocol.http.HttpURLConnection.getChainedException
(HttpURLConnection.java:1362)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream
(HttpURLConnection.java:1016)
at com.hp.hpl.jena.rdf.arp.JenaReader.read(JenaReader.java:84)
... 4 more
Caused by: java.net.UnknownHostException: spinrdf.org
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:177)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
at java.net.Socket.connect(Socket.java:525)
at java.net.Socket.connect(Socket.java:475)
at sun.net.NetworkClient.doConnect(NetworkClient.java:163)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:394)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:529)
at sun.net.www.http.HttpClient.<init>(HttpClient.java:233)
at sun.net.www.http.HttpClient.New(HttpClient.java:306)
at sun.net.www.http.HttpClient.New(HttpClient.java:323)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient
(HttpURLConnection.java:860)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect
(HttpURLConnection.java:801)
at sun.net.www.protocol.http.HttpURLConnection.connect
(HttpURLConnection.java:726)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream
(HttpURLConnection.java:1049)
at sun.net.www.protocol.http.HttpURLConnection.getHeaderField
(HttpURLConnection.java:2173)
at java.net.URLConnection.getContentEncoding(URLConnection.java:496)
at com.hp.hpl.jena.rdf.arp.JenaReader.read(JenaReader.java:82)
... 4 more
========================= END STACK TRACE OF EXCEPTION
=========================
I reach this line of code after SPIN.java:105 returns null, so it
resorts to reading the model from the Internet URI (which fails since
I am behind a firewall).
Obviously I have fixed this bug in my local copy of SPIN, so I'm just
asking that you roll the fix into the next official release.
-Dave
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