l?is-external=true" title="class or interface in java.lang">String</a>,T&gt;,<a href="../../../jakarta/json/JsonObject.html" title="interface in jakarta.json">JsonObject</a>&gt;</code></td>
<td class="colLast"><span class="typeNameLabel">JsonCollectors.</span><code><span class="memberNameLink"><a href="../../../jakarta/json/stream/JsonCollectors.html#groupingBy-java.util.function.Function-java.util.stream.Collector-">groupingBy</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/function