Updated Branches:
  refs/heads/MARMOTTA-406 [created] fedcc159a

http://git-wip-us.apache.org/repos/asf/marmotta/blob/fedcc159/platform/marmotta-core/src/main/java/org/apache/marmotta/platform/core/services/http/HttpClientServiceImpl.java
----------------------------------------------------------------------
diff --git 
a/platform/marmotta-core/src/main/java/org/apache/marmotta/platform/core/services/http/HttpClientServiceImpl.java
 
b/platform/marmotta-core/src/main/java/org/apache/marmotta/platform/core/services/http/HttpClientServiceImpl.java
index afda0df..18b2b44 100644
--- 
a/platform/marmotta-core/src/main/java/org/apache/marmotta/platform/core/services/http/HttpClientServiceImpl.java
+++ 
b/platform/marmotta-core/src/main/java/org/apache/marmotta/platform/core/services/http/HttpClientServiceImpl.java
@@ -17,32 +17,65 @@
  */
 package org.apache.marmotta.platform.core.services.http;
 
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.charset.Charset;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Date;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicLong;
+import java.util.concurrent.locks.ReentrantReadWriteLock;
+
+import javax.annotation.PostConstruct;
+import javax.annotation.PreDestroy;
+import javax.enterprise.context.ApplicationScoped;
+import javax.enterprise.event.Observes;
+import javax.enterprise.inject.Instance;
+import javax.inject.Inject;
+
 import net.sf.ehcache.Ehcache;
-import org.apache.http.*;
+
+import org.apache.http.Header;
+import org.apache.http.HttpEntity;
+import org.apache.http.HttpEntityEnclosingRequest;
+import org.apache.http.HttpHost;
+import org.apache.http.HttpRequest;
+import org.apache.http.HttpResponse;
+import org.apache.http.HttpStatus;
+import org.apache.http.ProtocolException;
+import org.apache.http.RequestLine;
 import org.apache.http.client.ClientProtocolException;
-import org.apache.http.client.HttpClient;
 import org.apache.http.client.HttpRequestRetryHandler;
 import org.apache.http.client.ResponseHandler;
 import org.apache.http.client.cache.CacheResponseStatus;
+import org.apache.http.client.cache.HttpCacheContext;
 import org.apache.http.client.cache.HttpCacheStorage;
-import org.apache.http.client.methods.*;
-import org.apache.http.client.params.ClientPNames;
+import org.apache.http.client.config.RequestConfig;
+import org.apache.http.client.methods.CloseableHttpResponse;
+import org.apache.http.client.methods.HttpDelete;
+import org.apache.http.client.methods.HttpGet;
+import org.apache.http.client.methods.HttpHead;
+import org.apache.http.client.methods.HttpPost;
+import org.apache.http.client.methods.HttpPut;
+import org.apache.http.client.methods.HttpRequestBase;
 import org.apache.http.conn.ClientConnectionManager;
-import org.apache.http.conn.scheme.PlainSocketFactory;
-import org.apache.http.conn.scheme.Scheme;
-import org.apache.http.conn.scheme.SchemeRegistry;
-import org.apache.http.conn.ssl.SSLSocketFactory;
+import org.apache.http.conn.HttpClientConnectionManager;
 import org.apache.http.entity.ContentType;
 import org.apache.http.entity.StringEntity;
-import org.apache.http.impl.client.DefaultHttpClient;
+import org.apache.http.impl.client.CloseableHttpClient;
 import org.apache.http.impl.client.DefaultRedirectStrategy;
+import org.apache.http.impl.client.HttpClientBuilder;
+import org.apache.http.impl.client.HttpClients;
 import org.apache.http.impl.client.cache.CacheConfig;
-import org.apache.http.impl.client.cache.CachingHttpClient;
+import org.apache.http.impl.client.cache.CachingHttpClientBuilder;
 import org.apache.http.impl.client.cache.ehcache.EhcacheHttpCacheStorage;
-import org.apache.http.impl.conn.PoolingClientConnectionManager;
-import org.apache.http.params.*;
+import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
+import org.apache.http.params.HttpParams;
 import org.apache.http.pool.PoolStats;
-import org.apache.http.protocol.HTTP;
 import org.apache.http.protocol.HttpContext;
 import org.apache.http.util.EntityUtils;
 import org.apache.marmotta.platform.core.api.config.ConfigurationService;
@@ -58,20 +91,6 @@ import 
org.apache.marmotta.platform.core.services.http.response.StatusCodeRespon
 import 
org.apache.marmotta.platform.core.services.http.response.StringBodyResponseHandler;
 import org.slf4j.Logger;
 
-import javax.annotation.PostConstruct;
-import javax.annotation.PreDestroy;
-import javax.enterprise.context.ApplicationScoped;
-import javax.enterprise.event.Observes;
-import javax.enterprise.inject.Instance;
-import javax.inject.Inject;
-import java.io.IOException;
-import java.io.InputStream;
-import java.nio.charset.Charset;
-import java.util.*;
-import java.util.concurrent.TimeUnit;
-import java.util.concurrent.atomic.AtomicLong;
-import java.util.concurrent.locks.ReentrantReadWriteLock;
-
 /**
  **/
 @ApplicationScoped
@@ -103,9 +122,9 @@ public class HttpClientServiceImpl implements 
HttpClientService {
     @MarmottaCache("http-client-cache")
     private Instance<Ehcache>            ehcache;
 
-    private HttpClient                   httpClient;
+    private CloseableHttpClient                   httpClient;
     private IdleConnectionMonitorThread  idleConnectionMonitorThread;
-    private BasicHttpParams              httpParams;
+//    private BasicHttpParams              httpParams;
 
     private  AtomicLong             bytesSent               = new AtomicLong();
     private  AtomicLong             bytesReceived           = new AtomicLong();
@@ -139,11 +158,11 @@ public class HttpClientServiceImpl implements 
HttpClientService {
     }
 
     /**
-     * Get a ready-to-use {@link HttpClient}.
+     * Get a ready-to-use {@link CloseableHttpClient}.
      */
     @Override
-    public HttpClient getHttpClient() {
-        return new ReadLockHttpClient();
+    public CloseableHttpClient getHttpClient() {
+        return new ReadLockHttpClient(httpClient);
     }
 
     /**
@@ -274,51 +293,48 @@ public class HttpClientServiceImpl implements 
HttpClientService {
         try {
             lock.writeLock().lock();
 
-            httpParams = new BasicHttpParams();
+            final HttpClientBuilder clientBuilder;
+            if 
(configurationService.getBooleanConfiguration("core.http.client_cache_enable", 
true)) {
+                CacheConfig cacheConfig = CacheConfig.custom()
+                        // FIXME: Hardcoded constants - is this useful?
+                        .setMaxCacheEntries(1000)
+                        .setMaxObjectSize(81920)
+                        .build();
+
+                final HttpCacheStorage cacheStore = new 
EhcacheHttpCacheStorage(ehcache.get(), cacheConfig);
+                clientBuilder = CachingHttpClientBuilder.create()
+                    .setCacheConfig(cacheConfig)
+                    .setHttpCacheStorage(cacheStore);
+            } else {
+                clientBuilder = HttpClients.custom();
+            }
             String userAgentString =
                     "Apache Marmotta/" + 
configurationService.getStringConfiguration("kiwi.version") +
                     " (running at " + configurationService.getServerUri() + 
")" +
                     " lmf-core/" + 
configurationService.getStringConfiguration("kiwi.version");
-            userAgentString = 
configurationService.getStringConfiguration("core.http.user_agent", 
userAgentString);
-
-            httpParams.setIntParameter(CoreConnectionPNames.SO_TIMEOUT, 
configurationService.getIntConfiguration("core.http.so_timeout", 60000));
-            httpParams.setIntParameter(CoreConnectionPNames.CONNECTION_TIMEOUT,
-                    
configurationService.getIntConfiguration("core.http.connection_timeout", 
10000));
-
-            httpParams.setBooleanParameter(ClientPNames.HANDLE_REDIRECTS, 
true);
-            httpParams.setIntParameter(ClientPNames.MAX_REDIRECTS, 3);
+            
clientBuilder.setUserAgent(configurationService.getStringConfiguration("core.http.user_agent",
 userAgentString));
 
-            SchemeRegistry schemeRegistry = new SchemeRegistry();
-            schemeRegistry.register(new Scheme("http", 80, 
PlainSocketFactory.getSocketFactory()));
-            schemeRegistry.register(new Scheme("https", 443, 
SSLSocketFactory.getSocketFactory()));
+            clientBuilder.setDefaultRequestConfig(RequestConfig.custom()
+                    
.setSocketTimeout(configurationService.getIntConfiguration("core.http.so_timeout",
 60000))
+                    
.setConnectTimeout(configurationService.getIntConfiguration("core.http.connection_timeout",
 10000))
+                    .setRedirectsEnabled(true)
+                    .setMaxRedirects(3)
+                    .build());
 
-            PoolingClientConnectionManager cm = new 
PoolingClientConnectionManager(schemeRegistry);
+            PoolingHttpClientConnectionManager cm = new 
PoolingHttpClientConnectionManager();
             
cm.setMaxTotal(configurationService.getIntConfiguration("core.http.max_connections",
 20));
             
cm.setDefaultMaxPerRoute(configurationService.getIntConfiguration("core.http.max_connections_per_route",
 10));
+            clientBuilder.setConnectionManager(cm);
+            
+            clientBuilder.setRedirectStrategy(new LMFRedirectStrategy());
+            clientBuilder.setRetryHandler(new LMFHttpRequestRetryHandler());
 
-            final DefaultHttpClient hc = new DefaultHttpClient(cm, httpParams);
-            hc.setRedirectStrategy(new LMFRedirectStrategy());
-            hc.setHttpRequestRetryHandler(new LMFHttpRequestRetryHandler());
-            
hc.removeRequestInterceptorByClass(org.apache.http.protocol.RequestUserAgent.class);
-            hc.addRequestInterceptor(new LMFRequestUserAgent(userAgentString));
-
-            if 
(configurationService.getBooleanConfiguration("core.http.client_cache_enable", 
true)) {
-                CacheConfig cacheConfig = new CacheConfig();
-                // FIXME: Hardcoded constants - is this useful?
-                cacheConfig.setMaxCacheEntries(1000);
-                cacheConfig.setMaxObjectSize(81920);
-
-                final HttpCacheStorage cacheStore = new 
EhcacheHttpCacheStorage(ehcache.get(), cacheConfig);
-
-                this.httpClient = new MonitoredHttpClient(new 
CachingHttpClient(hc, cacheStore, cacheConfig));
-            } else {
-                this.httpClient = new MonitoredHttpClient(hc);
-            }
+            this.httpClient = new MonitoredHttpClient(clientBuilder.build());
             bytesSent.set(0);
             bytesReceived.set(0);
             requestsExecuted.set(0);
 
-            idleConnectionMonitorThread = new 
IdleConnectionMonitorThread(httpClient.getConnectionManager());
+            idleConnectionMonitorThread = new IdleConnectionMonitorThread(cm);
             idleConnectionMonitorThread.start();
 
             StatisticsProvider stats = new StatisticsProvider(cm);
@@ -334,41 +350,16 @@ public class HttpClientServiceImpl implements 
HttpClientService {
             lock.writeLock().lock();
             
statisticsService.unregisterModule(HttpClientService.class.getSimpleName());
             idleConnectionMonitorThread.shutdown();
-            httpClient.getConnectionManager().shutdown();
+            try {
+                httpClient.close();
+            } catch (IOException e) {
+                log.warn("Exception while closing HttpClient: {}", 
e.getMessage());
+            }
         } finally {
             lock.writeLock().unlock();
         }
     }
 
-    private static class LMFRequestUserAgent implements HttpRequestInterceptor 
{
-
-        private final String baseUserAgent;
-
-        public LMFRequestUserAgent(String baseUserAgent) {
-            this.baseUserAgent = baseUserAgent;
-        }
-
-        private final String buildUserAgentString(String localPart) {
-            if (localPart == null || localPart.length() == 0)
-                return baseUserAgent;
-            else if (localPart.endsWith(baseUserAgent)) return localPart;
-            return localPart + " " + baseUserAgent;
-        }
-
-        @Override
-        public void process(HttpRequest request, HttpContext context) throws 
HttpException, IOException {
-            if (request == null) throw new IllegalArgumentException("HTTP 
request must not be null");
-            if (!request.containsHeader(HTTP.USER_AGENT)) {
-                String useragent = 
HttpProtocolParams.getUserAgent(request.getParams());
-                request.addHeader(HTTP.USER_AGENT, 
buildUserAgentString(useragent));
-            } else {
-                String useragent = 
request.getFirstHeader(HTTP.USER_AGENT).getValue();
-                request.setHeader(HTTP.USER_AGENT, 
buildUserAgentString(useragent));
-            }
-        }
-
-    }
-
     private static class LMFRedirectStrategy extends DefaultRedirectStrategy {
         @Override
         public boolean isRedirected(HttpRequest request, HttpResponse 
response, HttpContext context) throws ProtocolException {
@@ -420,10 +411,10 @@ public class HttpClientServiceImpl implements 
HttpClientService {
 
     private static class IdleConnectionMonitorThread extends Thread {
 
-        private final ClientConnectionManager connMgr;
+        private final HttpClientConnectionManager connMgr;
         private volatile boolean              shutdown;
 
-        public IdleConnectionMonitorThread(ClientConnectionManager connMgr) {
+        public IdleConnectionMonitorThread(HttpClientConnectionManager 
connMgr) {
             super("HttpClientService Idle Connection Manager");
             this.connMgr = connMgr;
             setDaemon(true);
@@ -459,9 +450,9 @@ public class HttpClientServiceImpl implements 
HttpClientService {
     private class StatisticsProvider implements StatisticsModule {
 
         private boolean                        enabled;
-        private PoolingClientConnectionManager connectionManager;
+        private PoolingHttpClientConnectionManager connectionManager;
 
-        public StatisticsProvider(PoolingClientConnectionManager cm) {
+        public StatisticsProvider(PoolingHttpClientConnectionManager cm) {
             this.connectionManager = cm;
             enabled = true;
         }
@@ -519,169 +510,54 @@ public class HttpClientServiceImpl implements 
HttpClientService {
 
     }
 
-    private class ReadLockHttpClient implements HttpClient {
+    private class ReadLockHttpClient extends CloseableHttpClient {
 
-        private HttpParams params;
+        private final CloseableHttpClient delegate;
 
-        public ReadLockHttpClient() {
-            this.params = new DefaultedHttpParams(new BasicHttpParams(), 
httpParams);
+        public ReadLockHttpClient(CloseableHttpClient delegate) {
+            this.delegate = delegate;
         }
 
         @Override
+        @Deprecated
         public HttpParams getParams() {
-            return params;
+            return delegate.getParams();
         }
 
         @Override
+        @Deprecated
         public ClientConnectionManager getConnectionManager() {
-            return httpClient.getConnectionManager();
-        }
-
-        @Override
-        public HttpResponse execute(HttpUriRequest request) throws 
IOException, ClientProtocolException {
-            lock.readLock().lock();
-            try {
-                return httpClient.execute(request);
-            } finally {
-                lock.readLock().unlock();
-            }
-        }
-
-        @Override
-        public HttpResponse execute(HttpUriRequest request, HttpContext 
context) throws IOException, ClientProtocolException {
-            lock.readLock().lock();
-            try {
-                return httpClient.execute(request, context);
-            } finally {
-                lock.readLock().unlock();
-            }
+            return delegate.getConnectionManager();
         }
 
         @Override
-        public HttpResponse execute(HttpHost target, HttpRequest request) 
throws IOException, ClientProtocolException {
-            lock.readLock().lock();
-            try {
-                return httpClient.execute(target, request);
-            } finally {
-                lock.readLock().unlock();
-            }
+        public void close() throws IOException {
+            // Nop; this Client is read only!
         }
 
         @Override
-        public HttpResponse execute(HttpHost target, HttpRequest request, 
HttpContext context) throws IOException, ClientProtocolException {
+        protected CloseableHttpResponse doExecute(HttpHost target,
+                HttpRequest request, HttpContext context) throws IOException,
+                ClientProtocolException {
             lock.readLock().lock();
             try {
-                return httpClient.execute(target, request, context);
+                return delegate.execute(target, request, context);
             } finally {
-                lock.readLock().unlock();
+                lock.readLock().lock();
             }
         }
 
-        @Override
-        public <T> T execute(HttpUriRequest request, ResponseHandler<? extends 
T> responseHandler) throws IOException, ClientProtocolException {
-            lock.readLock().lock();
-            try {
-                return httpClient.execute(request, responseHandler);
-            } finally {
-                lock.readLock().unlock();
-            }
-        }
-
-        @Override
-        public <T> T execute(HttpUriRequest request, ResponseHandler<? extends 
T> responseHandler, HttpContext context) throws IOException,
-        ClientProtocolException {
-            lock.readLock().lock();
-            try {
-                return httpClient.execute(request, responseHandler, context);
-            } finally {
-                lock.readLock().unlock();
-            }
-        }
-
-        @Override
-        public <T> T execute(HttpHost target, HttpRequest request, 
ResponseHandler<? extends T> responseHandler) throws IOException,
-        ClientProtocolException {
-            lock.readLock().lock();
-            try {
-                return httpClient.execute(target, request, responseHandler);
-            } finally {
-                lock.readLock().unlock();
-            }
-        }
-
-        @Override
-        public <T> T execute(HttpHost target, HttpRequest request, 
ResponseHandler<? extends T> responseHandler, HttpContext context)
-                throws IOException, ClientProtocolException {
-            lock.readLock().lock();
-            try {
-                return httpClient.execute(target, request, responseHandler, 
context);
-            } finally {
-                lock.readLock().unlock();
-            }
-        }
 
     }
 
-    protected class MonitoredHttpClient implements HttpClient {
+    protected class MonitoredHttpClient extends CloseableHttpClient {
 
-        private final HttpClient delegate;
+        private final CloseableHttpClient delegate;
 
-        public MonitoredHttpClient(HttpClient delegate) {
+        public MonitoredHttpClient(CloseableHttpClient delegate) {
             this.delegate = delegate;
         }
 
-        @Override
-        public HttpParams getParams() {
-            return delegate.getParams();
-        }
-
-        @Override
-        public ClientConnectionManager getConnectionManager() {
-            return delegate.getConnectionManager();
-        }
-
-        @Override
-        public HttpResponse execute(HttpUriRequest request) throws 
IOException, ClientProtocolException {
-            final Task task = preProcess(request);
-
-            final HttpResponse response;
-            lock.readLock().lock();
-            try {
-                response = delegate.execute(request);
-            } catch (ClientProtocolException cpe) {
-                task.endTask();
-                throw cpe;
-            } catch (IOException io) {
-                task.endTask();
-                throw io;
-            } finally {
-                lock.readLock().unlock();
-            }
-
-            return postProcess(response, null, task);
-        }
-
-        @Override
-        public HttpResponse execute(HttpUriRequest request, HttpContext 
context) throws IOException, ClientProtocolException {
-            final Task task = preProcess(request);
-
-            final HttpResponse response;
-            lock.readLock().lock();
-            try {
-                response = delegate.execute(request, context);
-            } catch (ClientProtocolException cpe) {
-                task.endTask();
-                throw cpe;
-            } catch (IOException io) {
-                task.endTask();
-                throw io;
-            } finally {
-                lock.readLock().unlock();
-            }
-
-            return postProcess(response, context, task);
-        }
-
         private Task preProcess(HttpRequest request) {
             final RequestLine rl = request.getRequestLine();
             final String taskName = String.format("%S %s %S", rl.getMethod(), 
rl.getUri(), request.getProtocolVersion());
@@ -702,14 +578,15 @@ public class HttpClientServiceImpl implements 
HttpClientService {
             return task;
         }
 
-        private HttpResponse postProcess(final HttpResponse response, 
HttpContext context, final Task task) {
+        private CloseableHttpResponse postProcess(final CloseableHttpResponse 
response, HttpContext context, final Task task) {
             requestsExecuted.incrementAndGet();
             task.resetProgress();
             task.updateMessage("retrieving response");
             if (response.getEntity() != null) {
                 boolean cachedResponse;
-                if (context != null) {
-                    CacheResponseStatus cacheRespStatus = 
(CacheResponseStatus) 
context.getAttribute(CachingHttpClient.CACHE_RESPONSE_STATUS);
+                if (context != null && context instanceof HttpCacheContext) {
+                    HttpCacheContext cacheContext = (HttpCacheContext) context;
+                    CacheResponseStatus cacheRespStatus = 
cacheContext.getCacheResponseStatus();
                     // To report download progress, the entity is wrapped in a 
MonitoredHttpEntity.
                     cachedResponse = cacheRespStatus != null && 
cacheRespStatus != CacheResponseStatus.CACHE_MISS;
                 } else {
@@ -723,34 +600,29 @@ public class HttpClientServiceImpl implements 
HttpClientService {
         }
 
         @Override
-        public HttpResponse execute(HttpHost target, HttpRequest request) 
throws IOException, ClientProtocolException {
-            final Task task = preProcess(request);
+        @Deprecated
+        public HttpParams getParams() {
+            return delegate.getParams();
+        }
 
-            final HttpResponse response;
-            lock.readLock().lock();
-            try {
-                response = delegate.execute(target, request);
-            } catch (ClientProtocolException cpe) {
-                task.endTask();
-                throw cpe;
-            } catch (IOException io) {
-                task.endTask();
-                throw io;
-            } finally {
-                lock.readLock().unlock();
-            }
+        @Override
+        @Deprecated
+        public ClientConnectionManager getConnectionManager() {
+            return delegate.getConnectionManager();
+        }
 
-            return postProcess(response, null, task);
+        @Override
+        public void close() throws IOException {
+            delegate.close();
         }
 
         @Override
-        public HttpResponse execute(HttpHost target, HttpRequest request, 
HttpContext context) throws IOException, ClientProtocolException {
+        protected CloseableHttpResponse doExecute(HttpHost target, HttpRequest 
request, HttpContext context) throws IOException, ClientProtocolException {
             final Task task = preProcess(request);
 
-            final HttpResponse response;
             lock.readLock().lock();
             try {
-                response = delegate.execute(target, request, context);
+                return postProcess(delegate.execute(target, request, context), 
context, task);
             } catch (ClientProtocolException cpe) {
                 task.endTask();
                 throw cpe;
@@ -760,49 +632,6 @@ public class HttpClientServiceImpl implements 
HttpClientService {
             } finally {
                 lock.readLock().unlock();
             }
-
-            return postProcess(response, context, task);
-        }
-
-        @Override
-        public <T> T execute(HttpUriRequest request, ResponseHandler<? extends 
T> responseHandler) throws IOException, ClientProtocolException {
-            final HttpResponse response = execute(request);
-
-            return processResponse(responseHandler, response);
-        }
-
-        private <T> T processResponse(ResponseHandler<? extends T> 
responseHandler, final HttpResponse response) throws ClientProtocolException,
-        IOException {
-            try {
-                return responseHandler.handleResponse(response);
-            } finally {
-                // Make sure everything is cleaned up properly
-                EntityUtils.consume(response.getEntity());
-            }
-        }
-
-        @Override
-        public <T> T execute(HttpUriRequest request, ResponseHandler<? extends 
T> responseHandler, HttpContext context) throws IOException,
-        ClientProtocolException {
-            final HttpResponse response = execute(request, context);
-
-            return processResponse(responseHandler, response);
-        }
-
-        @Override
-        public <T> T execute(HttpHost target, HttpRequest request, 
ResponseHandler<? extends T> responseHandler) throws IOException,
-        ClientProtocolException {
-            final HttpResponse response = execute(target, request);
-
-            return processResponse(responseHandler, response);
-        }
-
-        @Override
-        public <T> T execute(HttpHost target, HttpRequest request, 
ResponseHandler<? extends T> responseHandler, HttpContext context)
-                throws IOException, ClientProtocolException {
-            final HttpResponse response = execute(target, request, context);
-
-            return processResponse(responseHandler, response);
         }
 
     }

http://git-wip-us.apache.org/repos/asf/marmotta/blob/fedcc159/platform/marmotta-core/src/main/java/org/apache/marmotta/platform/core/services/prefix/PrefixCC.java
----------------------------------------------------------------------
diff --git 
a/platform/marmotta-core/src/main/java/org/apache/marmotta/platform/core/services/prefix/PrefixCC.java
 
b/platform/marmotta-core/src/main/java/org/apache/marmotta/platform/core/services/prefix/PrefixCC.java
index b231800..79272f8 100644
--- 
a/platform/marmotta-core/src/main/java/org/apache/marmotta/platform/core/services/prefix/PrefixCC.java
+++ 
b/platform/marmotta-core/src/main/java/org/apache/marmotta/platform/core/services/prefix/PrefixCC.java
@@ -101,6 +101,7 @@ public class PrefixCC implements PrefixProvider {
 
                 @Override
                 public String handleResponse(HttpResponse response) throws 
ClientProtocolException, IOException {
+                    log.error("StatusCode: {}", 
response.getStatusLine().getStatusCode());
                     if (200 == response.getStatusLine().getStatusCode()) {
                         HttpEntity entity = response.getEntity();
 
@@ -108,6 +109,7 @@ public class PrefixCC implements PrefixProvider {
                         try {
                             while (it.hasNext()) {
                                 final String l = it.next();
+                                log.error(": {}", l);
                                 if (l.endsWith("\t" + namespace)) {
                                     return l.substring(0, l.indexOf("\t"));
                                 }

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