diff --git a/core/src/main/java/jef/model/ModelBuilder.java b/core/src/main/java/jef/model/ModelBuilder.java
index d3e60ee..5ad9734 100644
--- a/core/src/main/java/jef/model/ModelBuilder.java
+++ b/core/src/main/java/jef/model/ModelBuilder.java
@@ -1,17 +1,15 @@
 package jef.model;
 
-import jef.Database;
 import jef.model.annotations.processors.AnnotationProcessor;
 import jef.model.constraints.ForeignKeyConstraint;
 import jef.model.constraints.IndexConstraint;
 import jef.model.constraints.KeyConstraint;
 import jef.model.constraints.PrimaryKeyConstraint;
 import jef.model.constraints.UniqueKeyConstraint;
-import jef.mysql.MysqlDatabase;
 import jef.serializable.SerializableObject;
 import jef.util.Check;
-import jef.util.Util;
 
+import java.lang.reflect.InvocationTargetException;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
@@ -45,7 +43,7 @@ public class ModelBuilder {
     }
 
     private static ModelBuilder from0(Class<? extends DbContext> context, ModelBuilderOptions options) {
-        var mb = new ModelBuilder(new ArrayList<>());
+        var mb = new ModelBuilder();
         EntityInitializer.initEntities(mb, context);
         EntityDefaultConstructorChecker.checkEntities(mb);
         PrimaryKeyInitializer.initPrimaryKeys(mb);
@@ -56,29 +54,18 @@ public class ModelBuilder {
             processor.apply(mb);
         }
 
-        Util.ThrowableBiFunction<Database, DbContextOptions, DbContext> init;//TODO create a function for initializing db contexts
         try {
-            var ctor = context.getDeclaredConstructor(Database.class, DbContextOptions.class);
-            init = ctor::newInstance;
-        } catch (NoSuchMethodException e) {
-            try {
-                var ctor = context.getDeclaredConstructor(DbContextOptions.class);
-                init = (d, o) -> ctor.newInstance(o);
-            } catch (NoSuchMethodException e2) {
-                try {
-                    var ctor = context.getDeclaredConstructor();
-                    init = (d, o) -> ctor.newInstance();
-                } catch (NoSuchMethodException e3) {
-                    throw new RuntimeException(e);
-                }
-            }
-        }
-        try {
-            DbContext instance = init.apply(new MysqlDatabase(null, null), options.getContextOptions());//TODO
+            var instance = context.getDeclaredConstructor().newInstance();
             instance.onModelCreate(mb);
             instance.onModelValidate(mb);
-        } catch (Throwable e) {
-            throw new RuntimeException(e);
+        } catch (InvocationTargetException e) {
+            throw new RuntimeException("Error while instantiating DbContext '" + context.getName() + "'", e);
+        } catch (InstantiationException e) {
+            throw new RuntimeException("Failed to instantiate DbContext '" + context.getName() + "'", e);
+        } catch (IllegalAccessException e) {
+            throw new RuntimeException("Default constructor of DbContext '" + context.getName() + "' must be publicly accessible", e);
+        } catch (NoSuchMethodException e) {
+            throw new RuntimeException("DbContext '" + context.getName() + "' does not have a default constructor", e);
         }
 
         return mb;