* next} field is lazily initialized. The type of that field would be {@code @Nullable T}, and the
   * code would be responsible for populating a "real" {@code T} (which might still be the value
   * {@code null}!) before returning it to callers. Depending on how the code is structured, a
   * nullness analysis might not understand that the field has been populated. To avoid that problem

```

////

## Recap { #recap }

Apart from all the fancy words used here, the **Dependency Injection** system is quite simple.

Just functions that look the same as the *path operation functions*.

But still, it is very powerful, and allows you to declare arbitrarily deeply nested dependency "graphs" (trees).

/// tip

All this might not seem as useful with these simple examples.

        CloseableUtil.closeQuietly(in);

        // Verify no metadata extracted
        assertNull(extractData.getValues("title"));
        assertNull(extractData.getValues("author"));

        // But content should still be present
        final String content = extractData.getContent();
        assertTrue(content.contains("Sample Document"));
    }

    public void test_maxDepth() {
        jsonExtractor.setMaxDepth(1);

        SocketInputStream sis = new SocketInputStream(in);

        // Reading with zero-length array should return 0 without consuming data
        assertEquals(0, sis.read(new byte[0]));

        // Verify data can still be read
        assertEquals(1, sis.read());
        assertEquals(2, sis.read());
    }

    @Test
    @DisplayName("Reading with null array throws NullPointerException")

		t.Errorf("Hamster's preferred toy should be cleared with Clear")
	}

	if DB.Model(&hamster2).Association("OtherToy").Count() != 1 {
		t.Errorf("Hamster's other toy should be still available")
	}

	DB.Model(&hamster).Association("OtherToy").Clear()
	if DB.Model(&hamster).Association("OtherToy").Count() != 0 {
		t.Errorf("Hamster's other toy should be cleared with Clear")
	}

       * The following call is not statically checked, since arraycopy accepts plain Object for its
       * parameters. If it were statically checked, the checker would still be OK with it, since
       * we're copying into a `contents` array whose type allows it to contain nulls. Still, it's
       * worth noting that we promise not to put nulls into the array in the first `size` elements.

  * Un parámetro de query.
  * Un header.
  * Una cookie.
* `http`: sistemas de autenticación HTTP estándar, incluyendo:
  * `bearer`: un header `Authorization` con un valor de `Bearer ` más un token. Esto se hereda de OAuth2.
  * Autenticación básica HTTP.
  * Digest HTTP, etc.
* `oauth2`: todas las formas de OAuth2 para manejar la seguridad (llamadas "flujos").

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        CloseableUtil.closeQuietly(in);

        // Verify no column metadata
        assertNull(extractData.getValues("columns"));

        // But content should still be present
        final String content = extractData.getContent();
        assertTrue(content.contains("John Doe"));
    }

    public void test_delimiterDetection() {
        // The test.csv uses comma delimiter

            // The finally block ensures pipe is closed even if handle close fails
            // Since the real method will propagate the exception from handle.close(),
            // we need to catch it to verify that pipe.close() was still called
            try {
                handle.close();
                fail("Expected IOException to be thrown");
            } catch (IOException e) {