t.Skip("skip sqlite, sqlserver due to it doesn't support multiple primary keys with auto increment")
	}

	if name := DB.Dialector.Name(); name == "mysql" {
		t.Skip("skip mysql due to it only allow unique constraint matching given keys")
	}

	type (
		Level1 struct {
			ID           uint   `gorm:"primary_key;"`
			LanguageCode string `gorm:"primary_key"`
			Value        string
		}

  @GwtIncompatible // complementOf
  public void testComplementOfEmptySet() {
    Set<SomeEnum> noUnits = emptySet();
    EnumSet<SomeEnum> allUnits = Sets.complementOf(noUnits, SomeEnum.class);
    verifySetContents(EnumSet.allOf(SomeEnum.class), allUnits);
  }

  @J2ktIncompatible
  @GwtIncompatible // complementOf
  public void testComplementOfFullSet() {
    Set<SomeEnum> allUnits = newHashSet(SomeEnum.values());

Te daré más ejemplos concretos en los próximos capítulos.

## Reinicios

De manera similar a asegurarte de que tu aplicación se ejecute al iniciar, probablemente también quieras asegurarte de que se **reinicie** después de fallos.

### Cometemos Errores

Nosotros, como humanos, cometemos **errores**, todo el tiempo. El software casi *siempre* tiene **bugs** ocultos en diferentes lugares. 🐛

Auf GitHub hilft Ihnen die Vorlage dabei, die richtige Frage zu schreiben, sodass Sie leichter eine gute Antwort erhalten oder das Problem sogar selbst lösen können, noch bevor Sie fragen. Und auf GitHub kann ich sicherstellen, dass ich immer alles beantworte, auch wenn es einige Zeit dauert. Ich persönlich kann das mit den Chat-Systemen nicht machen. 😅

    // exception later. If more than one stream throws an exception, the later ones are added to the
    // first as suppressed exceptions. We don't catch Error on the grounds that it should be allowed
    // to propagate immediately.
    Exception exception = null;
    for (BaseStream<?, ?> stream : toClose) {
      try {
        stream.close();
      } catch (Exception e) { // sneaky checked exception

            if (m.equals(method)) {
                return true;
            }
        }
        writeJsonResponse(HttpServletResponse.SC_METHOD_NOT_ALLOWED, escapeJsonKeyValue(MESSAGE_FIELD, method + " is not allowed."));
        return false;
    }

    /**
     * Processes a scroll search request.
     * @param request The HTTP request.
     * @param response The HTTP response.
     * @param chain The filter chain.

        // The cache cannot be written.
      }
      return null
    }

    if (requestMethod != "GET" && requestMethod != "QUERY") {
      // Don't cache non-GET and non-QUERY responses. We're technically allowed to cache HEAD
      // requests and some POST requests, but the complexity of doing so is high and the benefit
      // is low.
      return null
    }

    if (response.hasVaryAll()) {
      return null

// The file contents will be compressed using the [Deflate] method.
// The name must be a relative path: it must not start with a drive
// letter (e.g. C:) or leading slash, and only forward slashes are
// allowed. To create a directory instead of a file, add a trailing
// slash to the name. Duplicate names will not overwrite previous entries
// and are appended to the zip file.

            assertTrue(totalOperations > 0, "Some signing/verification operations should have been attempted");
        }

        @Test
        @DisplayName("Should not allow operations after secure wipe")
        void testNoOperationsAfterWipe() throws GeneralSecurityException {
            byte[] sessionKey = new byte[16];
            Arrays.fill(sessionKey, (byte) 0xDD);

For "synchronous" (contrary to "asynchronous") they commonly also use the term "sequential", because the computer / program follows all the steps in sequence before switching to a different task, even if those steps involve waiting.

### Concurrency and Burgers { #concurrency-and-burgers }