Index: trunk/CrossPare/src/de/ugoe/cs/cpdp/ExperimentConfiguration.java
===================================================================
--- trunk/CrossPare/src/de/ugoe/cs/cpdp/ExperimentConfiguration.java	(revision 65)
+++ trunk/CrossPare/src/de/ugoe/cs/cpdp/ExperimentConfiguration.java	(revision 66)
@@ -196,4 +196,5 @@
         postprocessors = new LinkedList<>();
         trainers = new LinkedList<>();
+        testAwareTrainers = new LinkedList<>();
         evaluators = new LinkedList<>();
 
Index: trunk/CrossPare/src/de/ugoe/cs/cpdp/training/WekaTestAwareTraining.java
===================================================================
--- trunk/CrossPare/src/de/ugoe/cs/cpdp/training/WekaTestAwareTraining.java	(revision 66)
+++ trunk/CrossPare/src/de/ugoe/cs/cpdp/training/WekaTestAwareTraining.java	(revision 66)
@@ -0,0 +1,66 @@
+// Copyright 2015 Georg-August-Universität Göttingen, Germany
+//
+//   Licensed under the Apache License, Version 2.0 (the "License");
+//   you may not use this file except in compliance with the License.
+//   You may obtain a copy of the License at
+//
+//       http://www.apache.org/licenses/LICENSE-2.0
+//
+//   Unless required by applicable law or agreed to in writing, software
+//   distributed under the License is distributed on an "AS IS" BASIS,
+//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//   See the License for the specific language governing permissions and
+//   limitations under the License.
+
+package de.ugoe.cs.cpdp.training;
+
+import java.io.PrintStream;
+import java.util.logging.Level;
+
+import org.apache.commons.io.output.NullOutputStream;
+
+import de.ugoe.cs.cpdp.wekaclassifier.ITestAwareClassifier;
+import de.ugoe.cs.util.console.Console;
+import weka.classifiers.rules.ZeroR;
+import weka.core.Instances;
+
+// TODO comment
+public class WekaTestAwareTraining extends WekaBaseTraining implements ITestAwareTrainingStrategy {
+
+    @Override
+    public void apply(Instances testdata, Instances traindata) {
+        classifier = setupClassifier();
+        if( !(classifier instanceof ITestAwareClassifier) ) {
+            throw new RuntimeException("classifier must implement the ITestAwareClassifier interface in order to be used as TestAwareTrainingStrategy");
+        }
+        ((ITestAwareClassifier) classifier).setTestdata(testdata);
+        PrintStream errStr = System.err;
+        System.setErr(new PrintStream(new NullOutputStream()));
+        try {
+            if (classifier == null) {
+                Console.traceln(Level.WARNING, String.format("classifier null!"));
+            }
+            classifier.buildClassifier(traindata);
+        }
+        catch (Exception e) {
+            if (e.getMessage().contains("Not enough training instances with class labels")) {
+                Console.traceln(Level.SEVERE,
+                                "failure due to lack of instances: " + e.getMessage());
+                Console.traceln(Level.SEVERE, "training ZeroR classifier instead");
+                classifier = new ZeroR();
+                try {
+                    classifier.buildClassifier(traindata);
+                }
+                catch (Exception e2) {
+                    throw new RuntimeException(e2);
+                }
+            }
+            else {
+                throw new RuntimeException(e);
+            }
+        }
+        finally {
+            System.setErr(errStr);
+        }
+    }
+}
Index: trunk/CrossPare/src/de/ugoe/cs/cpdp/wekaclassifier/ITestAwareClassifier.java
===================================================================
--- trunk/CrossPare/src/de/ugoe/cs/cpdp/wekaclassifier/ITestAwareClassifier.java	(revision 66)
+++ trunk/CrossPare/src/de/ugoe/cs/cpdp/wekaclassifier/ITestAwareClassifier.java	(revision 66)
@@ -0,0 +1,9 @@
+package de.ugoe.cs.cpdp.wekaclassifier;
+
+import weka.core.Instances;
+
+public interface ITestAwareClassifier {
+    
+    public void setTestdata(Instances testdata);
+
+}