diff --git a/core/src/test/java/jef/model/ModelBuilderCloneTest.java b/core/src/test/java/jef/model/ModelBuilderCloneTest.java
index cc7846a..241d282 100644
--- a/core/src/test/java/jef/model/ModelBuilderCloneTest.java
+++ b/core/src/test/java/jef/model/ModelBuilderCloneTest.java
@@ -98,19 +98,19 @@ public class ModelBuilderCloneTest {
             var o = expected.getEntities().get(i);
             var c = actual.getEntities().get(i);
             if (!o.getTypeName().equals(c.getTypeName())) {
-                System.out.println("typenames differ: entity " + o.getName());
-                System.out.println("ex: " + o.getTypeName());
-                System.out.println("ac: " + c.getTypeName());
+                System.err.println("typenames differ: entity " + o.getName());
+                System.err.println("ex: " + o.getTypeName());
+                System.err.println("ac: " + c.getTypeName());
             }
             if (!o.getName().equals(c.getName())) {
-                System.out.println("names differ: entity " + o.getName());
-                System.out.println("ex: " + o.getName());
-                System.out.println("ac: " + c.getName());
+                System.err.println("names differ: entity " + o.getName());
+                System.err.println("ex: " + o.getName());
+                System.err.println("ac: " + c.getName());
             }
             if (!Objects.equals(o.getPrimaryKey(), c.getPrimaryKey())) {
-                System.out.println("primary keys differ: entity " + o.getName());
-                System.out.println("ex: " + o.getPrimaryKey());
-                System.out.println("ac: " + c.getPrimaryKey());
+                System.err.println("primary keys differ: entity " + o.getName());
+                System.err.println("ex: " + o.getPrimaryKey());
+                System.err.println("ac: " + c.getPrimaryKey());
             }
 
             assertEquals(o.getForeignKeys().size(), c.getForeignKeys().size());
@@ -118,9 +118,9 @@ public class ModelBuilderCloneTest {
                 var ok = o.getForeignKeys().get(j);
                 var ck = c.getForeignKeys().get(j);
                 if (!Objects.equals(ok, ck)) {
-                    System.out.println("foreign keys differ: entity " + o.getName());
-                    System.out.println("ex: " + ok);
-                    System.out.println("ac: " + ck);
+                    System.err.println("foreign keys differ: entity " + o.getName());
+                    System.err.println("ex: " + ok);
+                    System.err.println("ac: " + ck);
                 }
             }
 
@@ -129,9 +129,9 @@ public class ModelBuilderCloneTest {
                 var ok = o.getUniqueKeys().get(j);
                 var ck = c.getUniqueKeys().get(j);
                 if (!Objects.equals(ok, ck)) {
-                    System.out.println("unique keys differ: entity " + o.getName());
-                    System.out.println("ex: " + ok);
-                    System.out.println("ac: " + ck);
+                    System.err.println("unique keys differ: entity " + o.getName());
+                    System.err.println("ex: " + ok);
+                    System.err.println("ac: " + ck);
                 }
             }
 
@@ -140,9 +140,9 @@ public class ModelBuilderCloneTest {
                 var ok = o.getKeys().get(j);
                 var ck = c.getKeys().get(j);
                 if (!Objects.equals(ok, ck)) {
-                    System.out.println("keys differ: entity " + o.getName());
-                    System.out.println("ex: " + ok);
-                    System.out.println("ac: " + ck);
+                    System.err.println("keys differ: entity " + o.getName());
+                    System.err.println("ex: " + ok);
+                    System.err.println("ac: " + ck);
                 }
             }
 
@@ -151,9 +151,9 @@ public class ModelBuilderCloneTest {
                 var ok = o.getIndexes().get(j);
                 var ck = c.getIndexes().get(j);
                 if (!Objects.equals(ok, ck)) {
-                    System.out.println("indexes differ: entity " + o.getName());
-                    System.out.println("ex: " + ok);
-                    System.out.println("ac: " + ck);
+                    System.err.println("indexes differ: entity " + o.getName());
+                    System.err.println("ex: " + ok);
+                    System.err.println("ac: " + ck);
                 }
             }
 
@@ -163,66 +163,66 @@ public class ModelBuilderCloneTest {
                 var cf = c.getFields().get(j);
 
                 if (of.isModelField() != cf.isModelField()) {
-                    System.out.println("is model fields differ: entity " + o.getName() + ", field " + of.getName());
-                    System.out.println("ex: " + of.isModelField());
-                    System.out.println("ac: " + cf.isModelField());
+                    System.err.println("is model fields differ: entity " + o.getName() + ", field " + of.getName());
+                    System.err.println("ex: " + of.isModelField());
+                    System.err.println("ac: " + cf.isModelField());
                 }
                 if (of.isDatabaseField() != cf.isDatabaseField()) {
-                    System.out.println("is database fields differ: entity " + o.getName() + ", field " + of.getName());
-                    System.out.println("ex: " + of.isDatabaseField());
-                    System.out.println("ac: " + cf.isDatabaseField());
+                    System.err.println("is database fields differ: entity " + o.getName() + ", field " + of.getName());
+                    System.err.println("ex: " + of.isDatabaseField());
+                    System.err.println("ac: " + cf.isDatabaseField());
                 }
                 if (of.isNotNull() != cf.isNotNull()) {
-                    System.out.println("is notnull differ: entity " + o.getName() + ", field " + of.getName());
-                    System.out.println("ex: " + of.isNotNull());
-                    System.out.println("ac: " + cf.isNotNull());
+                    System.err.println("is notnull differ: entity " + o.getName() + ", field " + of.getName());
+                    System.err.println("ex: " + of.isNotNull());
+                    System.err.println("ac: " + cf.isNotNull());
                 }
                 if (!Objects.equals(of.getSqlType(), cf.getSqlType())) {
-                    System.out.println("is sqltype differ: entity " + o.getName() + ", field " + of.getName());
-                    System.out.println("ex: " + of.getSqlType());
-                    System.out.println("ac: " + cf.getSqlType());
+                    System.err.println("is sqltype differ: entity " + o.getName() + ", field " + of.getName());
+                    System.err.println("ex: " + of.getSqlType());
+                    System.err.println("ac: " + cf.getSqlType());
                 }
                 if (of.getGenerated() != cf.getGenerated()) {
-                    System.out.println("is generated differ: entity " + o.getName() + ", field " + of.getName());
-                    System.out.println("ex: " + of.getGenerated());
-                    System.out.println("ac: " + cf.getGenerated());
+                    System.err.println("is generated differ: entity " + o.getName() + ", field " + of.getName());
+                    System.err.println("ex: " + of.getGenerated());
+                    System.err.println("ac: " + cf.getGenerated());
                 }
                 if (!of.getEntity().getName().equals(cf.getEntity().getName())) {
-                    System.out.println("entities differ: entity " + o.getName() + ", field " + of.getName());
-                    System.out.println("ex: " + of.getEntity().getName());
-                    System.out.println("ac: " + cf.getEntity().getName());
+                    System.err.println("entities differ: entity " + o.getName() + ", field " + of.getName());
+                    System.err.println("ex: " + of.getEntity().getName());
+                    System.err.println("ac: " + cf.getEntity().getName());
                 }
                 if (!of.getTypeName().equals(cf.getTypeName())) {
-                    System.out.println("typenames differ: entity " + o.getName() + ", field " + of.getName());
-                    System.out.println("ex: " + of.getTypeName());
-                    System.out.println("ac: " + cf.getTypeName());
+                    System.err.println("typenames differ: entity " + o.getName() + ", field " + of.getName());
+                    System.err.println("ex: " + of.getTypeName());
+                    System.err.println("ac: " + cf.getTypeName());
                 }
                 if (!Objects.equals(of.getType(), cf.getType())) {
-                    System.out.println("types differ: entity " + o.getName() + ", field " + of.getName());
-                    System.out.println("ex: " + of.getType());
-                    System.out.println("ac: " + cf.getType());
+                    System.err.println("types differ: entity " + o.getName() + ", field " + of.getName());
+                    System.err.println("ex: " + of.getType());
+                    System.err.println("ac: " + cf.getType());
                 }
                 if (!Objects.equals(of.getField() == null ? null : of.getField().getName(), cf.getField() == null ? null : cf.getField().getName())) {
-                    System.out.println("fields differ: entity " + o.getName() + ", field " + of.getName());
-                    System.out.println("ex: " + of.getField());
-                    System.out.println("ac: " + cf.getField());
+                    System.err.println("fields differ: entity " + o.getName() + ", field " + of.getName());
+                    System.err.println("ex: " + of.getField());
+                    System.err.println("ac: " + cf.getField());
                 }
                 if (!Objects.equals(of.getExposingForeignKeyOf() == null ? null : of.getExposingForeignKeyOf().getName(),
                                     cf.getExposingForeignKeyOf() == null ? null : cf.getExposingForeignKeyOf().getName())) {
-                    System.out.println("fk model links differ: entity " + o.getName() + ", field " + of.getName());
-                    System.out.println("ex: " + (of.getExposingForeignKeyOf() == null ? null : of.getExposingForeignKeyOf().getName()));
-                    System.out.println("ac: " + (cf.getExposingForeignKeyOf() == null ? null : cf.getExposingForeignKeyOf().getName()));
+                    System.err.println("fk model links differ: entity " + o.getName() + ", field " + of.getName());
+                    System.err.println("ex: " + (of.getExposingForeignKeyOf() == null ? null : of.getExposingForeignKeyOf().getName()));
+                    System.err.println("ac: " + (cf.getExposingForeignKeyOf() == null ? null : cf.getExposingForeignKeyOf().getName()));
                 }
                 if (!of.getName().equals(cf.getName())) {
-                    System.out.println("names differ: entity " + o.getName() + ", field " + of.getName());
-                    System.out.println("ex: " + of.getName());
-                    System.out.println("ac: " + cf.getName());
+                    System.err.println("names differ: entity " + o.getName() + ", field " + of.getName());
+                    System.err.println("ex: " + of.getName());
+                    System.err.println("ac: " + cf.getName());
                 }
 
 //                if (!Objects.equals(of, cf)) {
-//                    System.out.println("fields differ: entity " + o.getName() + ", field " + of.getName());
-//                    System.out.println("ex: " + of);
-//                    System.out.println("ac: " + cf);
+//                    System.err.println("fields differ: entity " + o.getName() + ", field " + of.getName());
+//                    System.err.println("ex: " + of);
+//                    System.err.println("ac: " + cf);
 //                }
             }
         }