wrapper/src/main/java/software/amazon/jdbc/exceptions/GenericExceptionHandler.java [47:64]:
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  public boolean isNetworkException(final Throwable throwable, @Nullable TargetDriverDialect targetDriverDialect) {
    Throwable exception = throwable;

    while (exception != null) {
      if (exception instanceof SQLException) {
        return isNetworkException(((SQLException) exception).getSQLState());
      } else if (targetDriverDialect != null) {
        String sqlState = targetDriverDialect.getSQLState(throwable);
        if (!StringUtils.isNullOrEmpty(sqlState)) {
          return isNetworkException(sqlState);
        }
      }

      exception = exception.getCause();
    }

    return false;
  }
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wrapper/src/main/java/software/amazon/jdbc/exceptions/AbstractPgExceptionHandler.java [36:53]:
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  public boolean isNetworkException(final Throwable throwable, @Nullable TargetDriverDialect targetDriverDialect) {
    Throwable exception = throwable;

    while (exception != null) {
      if (exception instanceof SQLException) {
        return isNetworkException(((SQLException) exception).getSQLState());
      } else if (targetDriverDialect != null) {
        String sqlState = targetDriverDialect.getSQLState(throwable);
        if (!StringUtils.isNullOrEmpty(sqlState)) {
          return isNetworkException(sqlState);
        }
      }

      exception = exception.getCause();
    }

    return false;
  }
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