# Error pages

Error pages can be divided into business errors and platform errors.

### Platform errors

Platform errors are errors that appear when an error occurs in the application that is handled by default in the platform, e.g. a session expiration error.

In the above situation, an error page is displayed containing textContent set in the platform configuration **errorPagesConfiguration**

{% hint style="info" %}
The configuration is set centrally in the platform. We do not have the ability to update it low-code in the designer. If changes are needed, contact the administrators.
{% endhint %}

\
**Sample configuration:**

```xml
<code_default>
    <content>error_page_default-*</content>
</code_default>
<code_serverSessionExpired>
    <content>error_page_serverSessionExpired-*</content>
    <retryButtonAvailable>true</retryButtonAvailable>
    <styleName>spider-night</styleName>
</code_serverSessionExpired>
<code_formLimitExceeded>
    <content>error_page_formLimitExceeded-*</content>
</code_formLimitExceeded>
```

### Business errors

**Business error** is a situation in which the user's action, a system process, or interaction with an external system violates the adopted business rules - even though, from a technical point of view, the operation could be performed.

Examples:

* Attempting to withdraw an amount exceeding the available funds.
* Submitting an application with an inactive customer account.
* Entering the application as a user who is not logged in, even though login is required

#### How to trigger it?

**Business error** it can be triggered in script services and script validators. It is best to use the method **throwBusinessException** and **getErrorPageDefinitionBuilder**.

Methods that can be called on the context object:

```javascript
context.getErrorPageDefinitionBuilder()
.body(string)
.styleName(string);
.msg(string)
.pageTitle(string)
.pageTitleKey(string)
.sidebarSlot2TextContent(string);
.sidebarSlot2(string);
.sidebarSlot1TextContent(string);
.sidebarSlot1(string);
.retryButtonAvailable(string)
.retryButtonAvailable(boolean);
.logobarTitle(string);
.logobarTitleKey(string)
.logobarDescription(string);
.bodyTextContent(string);
.parameter(String key, String value)
.cause(Throwable cause)
.redirectUrl(string)
.redirectDelayInMillis(string)
.businessFormIdentifier(string)
```

{% hint style="danger" %}
In the context object, do not call the method `build()`
{% endhint %}

{% hint style="info" %}
A good practice is to use the method `.msg` when triggering a business error. A clear business message should be passed there - e.g. `.msg("Application unavailable")`. The defined message will be written to the logs, which makes analysis and error identification easier.
{% endhint %}

Example script with comments:

```javascript
function callService(context) {
    let option = context.getFirstParameter('option');
 
    if (!option) {
        return []
    }
 
    let builder = context.getErrorPageDefinitionBuilder() // The method prepares the error screen to be displayed
 
    switch (option) {
        case "1": // Error screen that shows the content artifact 'error_page_default'
            builder.bodyTextContent("error_page_default-*")
            builder.msg("Application unavailable") // Error message that will be written to the logs
            break;
        case "2": // Error screen added using the content provided in body
            builder.body("Default body in the object")
            builder.parameter("type", "info")
            builder.msg("Application unavailable")
            break;
        case "3": // Error screen that shows the content artifact 'error_page_noAuthorization'
            builder.bodyTextContent("error_page_noAuthorization-*")
            builder.pageTitle("Page title")
            builder.logobarTitle("Logo title")
            builder.retryButtonAvailable(true);
            builder.msg("Application unavailable")
            break;
        default: // Default error screen displayed as a result of an error in the script
            throw "Script exception"
 
    }
    context.throwBusinessException(builder); // Throwing the error screen with the prepared builder object
 
 
    return [{ 'output': '' }];
}

```


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