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[BAEL-4056] Guide to MultipleBagFetchException (eugenp#10304)

* Removes DummyEntity * Uses Artist Entity instead of DummyEntity

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Original file line number	Diff line number	Diff line change
`@@ -57,7 +57,6 @@`
`57`	`57`	`</persistence-unit>`
`58`	`58`	`<persistence-unit name="jpa-h2-multiple-bag-fetch-exception">`
`59`	`59`	`<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>`
`60`		`- <class>com.baeldung.jpa.multiplebagfetchexception.DummyEntity</class>`
`61`	`60`	`<class>com.baeldung.jpa.multiplebagfetchexception.Album</class>`
`62`	`61`	`<class>com.baeldung.jpa.multiplebagfetchexception.Song</class>`
`63`	`62`	`<class>com.baeldung.jpa.multiplebagfetchexception.User</class>`

Lines changed: 3 additions & 3 deletions

Original file line number	Diff line number	Diff line change
`@@ -29,9 +29,9 @@ public static void setup() {`
`29`	`29`	`public void whenFetchingMoreThanOneBag_thenThrowAnException() {`
`30`	`30`	`IllegalArgumentException exception =`
`31`	`31`	`assertThrows(IllegalArgumentException.class, () -> {`
`32`		`- String jpql = "SELECT dummy FROM DummyEntity dummy "`
`33`		`- + "JOIN FETCH dummy.collection1 "`
`34`		`- + "JOIN FETCH dummy.collection2 ";`
	`32`	`+ String jpql = "SELECT artist FROM Artist artist "`
	`33`	`+ + "JOIN FETCH artist.songs "`
	`34`	`+ + "JOIN FETCH artist.offers ";`
`35`	`35`
`36`	`36`	`entityManager.createQuery(jpql);`
`37`	`37`	`});`

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