removed warnings

source/net/yacy/cora/federate/solr/connector/AbstractSolrConnector.java

@@ -52,7 +52,6 @@ import org.apache.solr.common.SolrInputDocument;
 import org.apache.solr.common.params.CommonParams;
 import org.apache.solr.common.params.DisMaxParams;
 import org.apache.solr.common.params.FacetParams;
-import org.apache.solr.common.params.ModifiableSolrParams;
 
 public abstract class AbstractSolrConnector implements SolrConnector {
 

source/net/yacy/cora/util/JSONException.java

@@ -27,7 +27,7 @@ public class JSONException extends Exception {
     }
 
     @Override
-    public Throwable getCause() {
+    public synchronized Throwable getCause() {
         return this.cause;
     }
 }

source/net/yacy/document/Document.java

@@ -641,7 +641,6 @@ dc_rights
                     assert false;
                     continue loop;
                 }
-                if (url == null) continue loop;
                 u = url.toNormalform(true);
                 if ((pos = u.toLowerCase().indexOf("http://", 7)) > 0) {
                     i.remove();