Erase type of BeanBinder#bindInstanceFields parameter in equality test

Fixes vaadin/framework8-issues#466

server/src/main/java/com/vaadin/data/BeanBinder.java

                     memberField.getName(),
                     objectWithMemberFields.getClass().getName()));
         }
-        if (propertyType.equals(valueType)) {
+        if (propertyType.equals(GenericTypeReflector.erase(valueType))) {
             HasValue<?> field;
             // Get the field from the object
             try {
             throw new IllegalStateException(String.format(
                     "Property type '%s' doesn't "
                             + "match the field type '%s'. "
-                            + "Binding should be configured manulaly using converter.",
+                            + "Binding should be configured manually using converter.",
                     propertyType.getName(), valueType.getTypeName()));
         }
     }

server/src/test/java/com/vaadin/data/BeanBinderTest.java

 
 import java.lang.reflect.Method;
 import java.util.List;
+import java.util.Set;
 
 import org.junit.Assert;
 import org.junit.Before;
 import com.vaadin.data.BeanBinder.BeanBindingBuilder;
 import com.vaadin.data.Binder.BindingBuilder;
 import com.vaadin.tests.data.bean.BeanToValidate;
+import com.vaadin.ui.CheckBoxGroup;
 
 public class BeanBinderTest
         extends BinderTestBase<BeanBinder<BeanToValidate>, BeanToValidate> {
 
+    private enum TestEnum {
+    }
+
+    private class TestClass {
+        private CheckBoxGroup<TestEnum> enums;
+    }
+
+    private class TestBean {
+        private Set<TestEnum> enums;
+
+        public Set<TestEnum> getEnums() {
+            return enums;
+        }
+
+        public void setEnums(Set<TestEnum> enums) {
+            this.enums = enums;
+        }
+    }
+
     @Before
     public void setUp() {
         binder = new BeanBinder<>(BeanToValidate.class);
         item.setAge(32);
     }
 
+    @Test
+    public void bindInstanceFields_parameters_type_erased() {
+        BeanBinder<TestBean> otherBinder = new BeanBinder<>(TestBean.class);
+        TestClass testClass = new TestClass();
+        otherBinder.bindInstanceFields(testClass);
+    }
+
     @Test
     public void fieldBound_bindBean_fieldValueUpdated() {
         binder.bind(nameField, "firstname");