diff --git a/querydsl-collections/src/test/java/com/mysema/query/collections/GroupBy2Test.java b/querydsl-collections/src/test/java/com/mysema/query/collections/GroupBy2Test.java
new file mode 100644
index 000000000..001702365
--- /dev/null
+++ b/querydsl-collections/src/test/java/com/mysema/query/collections/GroupBy2Test.java
@@ -0,0 +1,114 @@
+package com.mysema.query.collections;
+
+import static com.mysema.query.group.GroupBy.list;
+import static org.junit.Assert.*;
+
+import java.util.List;
+import java.util.Map;
+
+import org.junit.Test;
+
+import com.google.common.collect.Lists;
+import com.mysema.query.annotations.QueryEntity;
+import com.mysema.query.annotations.QueryProjection;
+import com.mysema.query.group.GroupBy;
+
+public class GroupBy2Test {
+    
+//    select u1.id,u1.name,r1.id,r1.name,s1.name from users u1
+//    join roles r1 on u1.role = r1.id
+//    join security_groups s1 on r1.secgroup = s1.id
+    
+    @QueryEntity
+    public static class User {
+        public Long id;
+        public String name;
+        public List<Role> roles;
+    }
+    
+    @QueryEntity
+    public static class Role {
+        public Long id;
+        public String name;
+        public List<SecurityGroup> groups;
+    }
+    
+    @QueryEntity
+    public static class SecurityGroup {
+        public Long id;
+        public String name;
+        
+        public SecurityGroup(Long id, String name) {
+            this.id = id;
+            this.name = name;
+        }
+    }
+    
+    public static class UserDto {
+        public Long id;
+        public String name;
+        public List<Long> roleIds;
+        public List<String> roleNames;
+        public List<Long> secIds;
+        
+        @QueryProjection
+        public UserDto(Long id, String name, List<Long> roleIds, List<String> roleNames, List<Long> secIds) {
+            this.id = id;
+            this.name = name;
+            this.roleIds = roleIds;
+            this.roleNames = roleNames;
+            this.secIds = secIds;
+        }
+    }
+    
+    @Test
+    public void test() {                       
+        Role r1 = new Role();
+        r1.id = 1l;
+        r1.name = "User";
+        r1.groups = Lists.newArrayList(new SecurityGroup(1l, "User 1"));
+                
+        Role r2 = new Role();
+        r2.id = 1l;
+        r2.name = null; // NOTE this is null on purpose
+        r2.groups = Lists.newArrayList(new SecurityGroup(2l, "Admin 1"),
+                                       new SecurityGroup(3l, "Admin 2"));
+        
+        User u1 = new User();
+        u1.id = 3l;
+        u1.name = "Bob";
+        u1.roles = Lists.newArrayList(r1);
+        
+        User u2 = new User();
+        u2.id = 32l;
+        u2.name = "Ann";
+        u2.roles = Lists.newArrayList(r1, r2);
+        
+        QGroupBy2Test_User user = QGroupBy2Test_User.user;
+        QGroupBy2Test_Role role = QGroupBy2Test_Role.role;
+        QGroupBy2Test_SecurityGroup group = QGroupBy2Test_SecurityGroup.securityGroup;
+        
+        Map<Long, UserDto> userDtos = MiniApi.from(user, Lists.newArrayList(u1, u2))
+                .innerJoin(user.roles, role)
+                .innerJoin(role.groups, group)
+                .transform(GroupBy.groupBy(user.id)
+                    .as(new QGroupBy2Test_UserDto(
+                            user.id, 
+                            user.name,
+                            list(role.id), 
+                            list(role.name), 
+                            list(group.id))));
+        
+        UserDto dto1 = userDtos.get(3l);
+        assertEquals(1, dto1.roleIds.size());
+        assertEquals(1, dto1.roleNames.size());
+        assertEquals(1, dto1.secIds.size());
+        
+        UserDto dto2 = userDtos.get(32l);
+        assertEquals(3, dto2.roleIds.size());
+        assertEquals(3, dto2.roleNames.size());
+        assertEquals(3, dto2.secIds.size());
+        
+    }
+
+}