HHH-13644 fix the NPE by override ProcedureCallImpl's 'getResultStream()' method.

hibernate-core/src/main/java/org/hibernate/procedure/internal/ProcedureCallImpl.java

@@ -18,6 +18,7 @@ import java.util.List;
 import java.util.Map;
 import java.util.Set;
 import java.util.function.Consumer;
+import java.util.stream.Stream;
 import javax.persistence.FlushModeType;
 import javax.persistence.LockModeType;
 import javax.persistence.NoResultException;
@@ -918,4 +919,10 @@ public class ProcedureCallImpl<R>
 		return this;
 	}
 
+	@Override
+	@SuppressWarnings("unchecked")
+	public Stream getResultStream() {
+		return getResultList().stream();
+	}
+
 }

hibernate-core/src/test/java/org/hibernate/procedure/internal/ProcedureCallImplTest.java

@@ -0,0 +1,39 @@
+package org.hibernate.procedure.internal;
+
+import java.util.stream.Stream;
+import javax.persistence.EntityManager;
+import javax.persistence.Query;
+import org.hibernate.dialect.H2Dialect;
+import org.hibernate.jpa.test.BaseEntityManagerFunctionalTestCase;
+import org.hibernate.testing.RequiresDialect;
+import org.hibernate.testing.TestForIssue;
+import org.junit.Assert;
+import org.junit.Test;
+
+/**
+ * @author Nathan Xu
+ */
+public class ProcedureCallImplTest extends BaseEntityManagerFunctionalTestCase {
+
+	@Test
+	@TestForIssue( jiraKey = "HHH-13644" )
+	@RequiresDialect( H2Dialect.class )
+	public void testNoNullPointerExceptionThrown() {
+
+		EntityManager em = getOrCreateEntityManager();
+
+		em.getTransaction().begin();
+
+		em.createNativeQuery("CREATE ALIAS GET_RANDOM_VALUE FOR \"java.lang.Math.random\";").executeUpdate();
+
+		Query query = em.createStoredProcedureQuery("GET_RANDOM_VALUE");
+
+		Stream stream = query.getResultStream();
+
+		Assert.assertEquals(1, stream.count());
+
+		em.getTransaction().commit();
+
+		em.close();
+	}
+}