diff --git a/src/main/java/edu/lu/uni/serval/FixPatternParser/violations/FixedViolationHunkParser.java b/src/main/java/edu/lu/uni/serval/FixPatternParser/violations/FixedViolationHunkParser.java
index 98e278d..6989548 100644
--- a/src/main/java/edu/lu/uni/serval/FixPatternParser/violations/FixedViolationHunkParser.java
+++ b/src/main/java/edu/lu/uni/serval/FixPatternParser/violations/FixedViolationHunkParser.java
@@ -214,7 +214,7 @@ public class FixedViolationHunkParser extends FixedViolationParser {
 				}
 				if (bugEndLine - bugStartLine > Configuration.HUNK_SIZE || fixEndLine - fixStartLine > Configuration.HUNK_SIZE) {
 					this.largeHunk ++;
-					log.error("#LargeHunk: " + revFile.getName());
+					System.err.println("#LargeHunk: " + revFile.getName());
 					continue;
 				}
 
diff --git a/src/main/java/edu/lu/uni/serval/FixPatternParser/violations/FixedViolationParser.java b/src/main/java/edu/lu/uni/serval/FixPatternParser/violations/FixedViolationParser.java
index 168bde8..fe13d9b 100644
--- a/src/main/java/edu/lu/uni/serval/FixPatternParser/violations/FixedViolationParser.java
+++ b/src/main/java/edu/lu/uni/serval/FixPatternParser/violations/FixedViolationParser.java
@@ -55,7 +55,7 @@ public class FixedViolationParser extends Parser {
 		if (gumTreeResults == null) {
 			return null;
 		} else if (gumTreeResults.size() == 0){
-			log.error("#NoSourceCodeChange: " + revFile.getName());
+			System.err.println("#NoSourceCodeChange: " + revFile.getName());
 			return actionSets;
 		} else {
 			// Regroup GumTre results.
@@ -75,7 +75,7 @@ public class FixedViolationParser extends Parser {
 			actionSets = sorter.sortAscending();
 			
 			if (actionSets.size() == 0) {
-				log.error("#NoStatementChange: " + revFile.getName());
+				System.err.println("#NoStatementChange: " + revFile.getName());
 			}
 			
 			return actionSets;
diff --git a/src/main/java/edu/lu/uni/serval/MultipleThreadsParser/AkkaParser.java b/src/main/java/edu/lu/uni/serval/MultipleThreadsParser/AkkaParser.java
index ed05a9d..5fe5f9c 100644
--- a/src/main/java/edu/lu/uni/serval/MultipleThreadsParser/AkkaParser.java
+++ b/src/main/java/edu/lu/uni/serval/MultipleThreadsParser/AkkaParser.java
@@ -44,7 +44,7 @@ public class AkkaParser {
 
 		ActorSystem system = null;
 		ActorRef parsingActor = null;
-		int numberOfWorkers = 200;
+		int numberOfWorkers = 400;
 		final WorkMessage msg = new WorkMessage(0, msgFiles);
 		try {
 			log.info("Akka begins...");
diff --git a/src/main/java/edu/lu/uni/serval/MultipleThreadsParser/ParseFixPatternWorker.java b/src/main/java/edu/lu/uni/serval/MultipleThreadsParser/ParseFixPatternWorker.java
index 465df63..a954aee 100644
--- a/src/main/java/edu/lu/uni/serval/MultipleThreadsParser/ParseFixPatternWorker.java
+++ b/src/main/java/edu/lu/uni/serval/MultipleThreadsParser/ParseFixPatternWorker.java
@@ -89,7 +89,7 @@ public class ParseFixPatternWorker extends UntypedActor {
 				File positionFile = msgFile.getPositionFile();
 				if (revFile.getName().toLowerCase().contains("test")) {
 					testAlarms += countAlarms(positionFile);
-					log.error("#TestViolation: " + revFile.getName());
+					System.err.println("#TestViolation: " + revFile.getName());
 //					continue;
 				}
 //				Parser parser = null;
@@ -121,7 +121,7 @@ public class ParseFixPatternWorker extends UntypedActor {
 					if ("".equals(editScript)) {
 						if (parser.resultType == 1) {
 							nullGumTreeResults += countAlarms(positionFile);
-							log.error("#NullGumTreeResult: " + revFile.getName());
+							System.err.println("#NullGumTreeResult: " + revFile.getName());
 						} else if (parser.resultType == 2) {
 							noSourceCodeChanges += countAlarms(positionFile);
 						}
@@ -154,15 +154,15 @@ public class ParseFixPatternWorker extends UntypedActor {
 //					err.println("task timed out");
 					future.cancel(true);
 					expNums += countAlarms(positionFile);
-					log.error("#Timeout: " + revFile.getName());
+					System.err.println("#Timeout: " + revFile.getName());
 				} catch (InterruptedException e) {
 					expNums += countAlarms(positionFile);
 //					err.println("task interrupted");
-					log.error("#TimeInterrupted: " + revFile.getName());
+					System.err.println("#TimeInterrupted: " + revFile.getName());
 				} catch (ExecutionException e) {
 					expNums += countAlarms(positionFile);
 //					err.println("task aborted");
-					log.error("#TimeAborted: " + revFile.getName());
+					System.err.println("#TimeAborted: " + revFile.getName());
 				} finally {
 					executor.shutdownNow();
 				}
diff --git a/src/main/java/edu/lu/uni/serval/gumtree/regroup/HunkActionFilter.java b/src/main/java/edu/lu/uni/serval/gumtree/regroup/HunkActionFilter.java
index 6f65b43..7c3d70b 100644
--- a/src/main/java/edu/lu/uni/serval/gumtree/regroup/HunkActionFilter.java
+++ b/src/main/java/edu/lu/uni/serval/gumtree/regroup/HunkActionFilter.java
@@ -440,7 +440,7 @@ public class HunkActionFilter {
 				violation.getActionSets().addAll(matchedActionSets);
 				selectedViolations.add(violation);
 			} else {
-				log.error("#NullMatchedGumTreeResult: "  + revFile.getName().replace("#", "/") + "  :  " +violation.getStartLineNum() + " : " + 
+				System.err.println("#NullMatchedGumTreeResult: "  + revFile.getName().replace("#", "/") + "  :  " +violation.getStartLineNum() + " : " + 
 						violation.getEndLineNum() + " : " + violation.getAlarmType());
 			}
 		}