diff --git a/src/main/java/org/gcube/common/clients/stubs/jaxws/StubCache.java b/src/main/java/org/gcube/common/clients/stubs/jaxws/StubCache.java
index 84df48a..7980393 100644
--- a/src/main/java/org/gcube/common/clients/stubs/jaxws/StubCache.java
+++ b/src/main/java/org/gcube/common/clients/stubs/jaxws/StubCache.java
@@ -30,6 +30,22 @@ class StubCache {
 	//holds key locks for LRU map
 	private ConcurrentHashMap<QName,Lock> nameLocks = new ConcurrentHashMap<QName, Lock>();
 	
+	void clear(QName name) {
+		
+		//obtain a lock for current key
+		Lock nameLock = lockFor(name);
+		
+		try {
+			
+			cache.remove(name);
+		}
+		finally {
+			nameLock.unlock();
+		}
+
+	}
+	
+	
 	Service get(QName name,Callable<Service> task) {
 		
 		//obtain a lock for current key
diff --git a/src/main/java/org/gcube/common/clients/stubs/jaxws/StubFactory.java b/src/main/java/org/gcube/common/clients/stubs/jaxws/StubFactory.java
index 1cbf1ab..fd4ff8d 100644
--- a/src/main/java/org/gcube/common/clients/stubs/jaxws/StubFactory.java
+++ b/src/main/java/org/gcube/common/clients/stubs/jaxws/StubFactory.java
@@ -112,7 +112,14 @@ public class StubFactory<T> implements StubFactoryDSL.AtClause<T> {
 			registerHandler(provider, target);
 
 			return stub;
-		} catch (Exception e) {
+		
+		} catch (Error e) { //bad stubs/wsdls cause java.lang.Errors
+			
+			cache.clear(target.qName()); //clear cache
+			
+			throw new RuntimeException("could not configure discovery service", e);
+			
+		} catch (Exception e) { //bad stubs can cause java.lang.Errors (!) 
 			throw new RuntimeException("could not configure discovery service", e);
 		}
 	}
diff --git a/src/test/java/org/acme/jaxws/stubs/StatelessStub.java b/src/test/java/org/acme/jaxws/stubs/StatelessStub.java
index 18c0afb..3e5a735 100644
--- a/src/test/java/org/acme/jaxws/stubs/StatelessStub.java
+++ b/src/test/java/org/acme/jaxws/stubs/StatelessStub.java
@@ -28,6 +28,14 @@ import org.gcube.common.clients.stubs.jaxws.GCoreService;
 @XmlSeeAlso(Sometype.class)
 public interface StatelessStub {
 
+	public class AcmeConstants {
+
+		  public static final String serviceNS = "http://acme.org";
+		  public static final String porttypeNS = "http://acme.org";
+		  public static final QName name = new QName(serviceNS,"AcmeService");
+		  public static final String porttypeLN = "AcmePortType";
+	}
+	
 	public static final QName name = new QName("http://acme.org/service","StatelessService");
 	
 	public static final String porttypeNS = "http://acme.org";