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                                            <p style="margin: 10px 0 0 0">It's the following:</p> 
                                            <blockquote style="margin: 10px 0 0 0; border-left: 1px solid #ccc; color: #707070; margin-left: 19px; padding: 10px 20px"> 
                                                <p style="margin: 10px 0 0 0">A parameterized bean type is considered assignable to a parameterized required type if they have<br /> identical raw type and for each parameter:</p> 
                                                <ul class="alternate" type="square"> 
                                                    <li>
                                                        the required type parameter is an actual type, the bean type parameter is a type variable and<br /> the actual type is assignable to the upper bound, if any, of the type variable, or
                                                    </li> 
                                                </ul> 
                                            </blockquote> 
                                            <p style="margin: 10px 0 0 0">We start with:</p> 
                                            <blockquote style="margin: 10px 0 0 0; border-left: 1px solid #ccc; color: #707070; margin-left: 19px; padding: 10px 20px">
                                                <p style="margin: 10px 0 0 0">A parameterized bean type is considered assignable to a parameterized required type if they have<br /> identical raw type</p>
                                            </blockquote> 
                                            <p style="margin: 10px 0 0 0">So here we have:</p> 
                                            <ul class="alternate" type="square"> 
                                                <li>
                                                    required type = MyService&lt;ClassA, ClassB&gt;
                                                </li> 
                                                <li>
                                                    bean type = MyService&lt;T extends MasterDbo&lt;D&gt;,D extends DetailDbo&gt;
                                                </li> 
                                            </ul> 
                                            <p style="margin: 10px 0 0 0">both of them are parameterized and have identical raw type. <img class="emoticon" src="https://issues.jboss.org/images/icons/emoticons/check.gif" height="16" width="16" align="absmiddle" alt="" border="0" /> So far so good. Next we need to consider parameters. Let's start with the first one. Our parameters match the following option:</p> 
                                            <blockquote style="margin: 10px 0 0 0; border-left: 1px solid #ccc; color: #707070; margin-left: 19px; padding: 10px 20px"> 
                                                <p style="margin: 10px 0 0 0">the required type parameter is an actual type, the bean type parameter is a type variable and<br /> the actual type is assignable to the upper bound, if any, of the type variable, or</p>
                                            </blockquote> 
                                            <ul class="alternate" type="square"> 
                                                <li>
                                                    required type parameter = ClassA
                                                </li> 
                                                <li>
                                                    bean type parameter = T extends MasterDbo&lt;D&gt;
                                                </li> 
                                            </ul> 
                                            <p style="margin: 10px 0 0 0">the required type parameter is an actual type <img class="emoticon" src="https://issues.jboss.org/images/icons/emoticons/check.gif" height="16" width="16" align="absmiddle" alt="" border="0" /><br /> the bean type parameter is a type variable <img class="emoticon" src="https://issues.jboss.org/images/icons/emoticons/check.gif" height="16" width="16" align="absmiddle" alt="" border="0" /><br /> the actual type is assignable to the upper bound, if any, of the type variable <img class="emoticon" src="https://issues.jboss.org/images/icons/emoticons/help_16.gif" height="16" width="16" align="absmiddle" alt="" border="0" /></p> 
                                            <p style="margin: 10px 0 0 0">Now we need to figure out whether ClassA is assignable to MasterDbo&lt;D&gt; or in other words whether ClassA is a subtype of MasterDbo&lt;D&gt;. Per definition it is true that ClassA is a subtype of MasterDbo&lt;ClassB&gt; so the question is whether MasterDbo&lt;ClassB&gt; is assignable to MasterDbo&lt;D extends DetailDbo&gt;. </p> 
                                            <p style="margin: 10px 0 0 0">Per <a href="http://docs.oracle.com/javase/specs/jls/se8/html/jls-4.html#jls-4.10" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">JLS</a> D extends DetailDbo is a direct subtype of DetailDbo. Since per JLS parameterized types are invariant, MasterDbo&lt;ClassB&gt; is not a subtype of MasterDbo&lt;D extends DetailDbo&gt; and therefore not assignable to it.</p> 
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