Verify whether a variable is empty or not, within the sequence flows in Camunda Modeler

When working with a sequenceFlow in a process instance, I need to check a condition that may involve a variable that has not been defined yet. I want the flow to proceed even if the variable is not defined, rather than throwing an ActivitiException.

I have written my condition as follows:

${ A == null || A.a >= B.b }

However, when A is null (not defined), I am unable to proceed :/

Is there a solution to this issue?

Answer №1

One possible solution is to implement an ExecutionListener and set the value at the start of your process to ensure it never becomes Null.

Similar questions

If you have not found the answer to your question or you are interested in this topic, then look at other similar questions below or use the search

Ways to prevent false activation of functions due to changes and clicks

I have a text box and a clear button. When the user inputs something in the text box and then clicks out of it, a function called 'validate()' is triggered to perform an action. However, when I click the clear button instead and trigger another f ...

What is the best way to fill the MongoDB post schema with every comment for the post?

I have created two schemas, one for posts and another for comments. const PostSchema = new Schema( { title: { type: String, required: true }, text: { type: String, required: true }, author: { type: Schema.Types.ObjectId, ref: 'User' ...

Error Encountered in MERN Stack Development: TypeError Thrown Due to Inability to Convert Undefined

Currently, I am following the MERN Stack, Front To Back Course by Traversy Media. I am in the process of setting up the login functionality for the application. Despite ensuring that my code matches his exactly, I am encountering an error: TypeError: Canno ...

Nestjs crashes with "terminated" on an Amazon EC2 instance

https://i.stack.imgur.com/3GSft.jpgMy application abruptly terminates with the error message "killed" without providing any additional information or stack trace. Interestingly, it functions properly when run locally. Any assistance would be greatly appr ...

When a React CSS class is deployed to a production server, it may be automatically

I've encountered a strange CSS issue while working on my React project. One specific section of the JSX <div> has a class with style properties defined in the main .css file. During local development, everything appears as expected. However, aft ...

An error has occurred: Noty (notification library) is not defined in this AngularJS Web Application

I am currently diving into the world of AngularJS and building a web application from scratch. As a newbie to AngularJS, I want to point out that I might be missing something crucial. An issue has arisen: After installing the Noty library (npm install no ...

Retrieving data from Firebase query and displaying as an array of results

Currently utilizing the @react-native-firebase wrapper for interaction with Firebase's Firestore. Within my function, some querying to a specific collection is performed, with the expected result being an Array object containing each located document. ...

Encountered a glitch while trying to install React JS using npx create-react-app xyz

After entering the command in the terminal, I encountered an error stating: npm Err! code-ENOENT npm Err! syscall lstat npm Err! path Interestingly, this same command worked perfectly on my instructor's laptops. For reference, I have attached a snaps ...

When creating a new instance of the Date object in Javascript, the constructor will output a date that is

In my project using TypeScript (Angular 5), I encountered the following scenario: let date = new Date(2018, 8, 17, 14, 0); The expected output should be "Fri Aug 17 2018 14:00:00 GMT-0400 (Eastern Daylight Time)", but instead, it is returning: Mon Sep ...

What is the best way to access the element menu with element-ui?

I am looking for a way to programmatically open an element in my menu, but I haven't been able to find any information on how to do it. HTML <script src="//unpkg.com/vue/dist/vue.js"></script> <script src="//unpkg.com/<a hr ...

Encountering an error when attempting to generate a production build after running the npm install command with the

After adding the brotli-webpack-plugin as a devDependency, I encountered an issue when attempting to generate a production build using npm run build (which internally runs next build). The error message displayed was: Error: Cannot find module 'bro ...

Implementing asynchronous file reading with module.exports in Node.js

Apologies in advance for what may seem like a basic question, but I'm delving into the inner workings of node and need help with a particular issue: I am trying to send an object or file from fs.readFile using require and module.exports. So far, this ...

Typing in Text within Kendo Textbox using Protractor

I'm encountering an issue with Protractor while trying to input text into a Kendo TextBox. The error message I receive is "ElementNotVisibleError: element not visible". Interestingly, when the text box is clicked on, the "style="display: none;" change ...

Mastering the art of grouping by a key and generating sub-objects from a plain array of key-value pairs in JavaScript ES5 without relying on third-party libraries

My dataset consists of an array of objects, each containing 4 keys: [ { "team": "USA", "team_profile_id": "10", "player": "Captain America", "player_id": "10X1" }, { "team": "USA", "team_profile_id": "10", "player": "The ...

Utilizing long polling technique with jQuery/AJAX on the server end

Currently, I am facing an issue with long polling on a single page that contains multiple pages. The problem arises when a new request is made while a previous request is still processing. Even though I attempt to abort the previous request, it completes b ...

The download button consistently targets and downloads the initial SVG in my collection. How can I configure it to target each individual SVG for download?

I'm currently working on a QR code app using React. The goal is for users to submit a form with a value, which will then generate an SVG QR code that can be downloaded. However, I'm running into an issue where the same SVG file is being downloade ...

Decoding arrays of JSON data

Receiving "chunked" data (json arrays) on the front-end via "xhr" (onprogress). Handling delayed chunks is easy - just remember response length and offset. The challenge comes when multiple "chunked" responses arrive simultaneously, resulting in an unpars ...

The second AJAX request isn't functioning properly; it should only be executed once the first one has successfully completed

I am experiencing an issue with my ajax calls. The second call should only be triggered after the first one is successful. However, even though the first call always returns success, I keep getting an error for the second one. function proceedWithUnlock(t ...

Adjust the size of the div to match its parent's size when resizing

Can a div be resized to match its parent's size on window resize? Here is the current HTML code: <div class="sliderContainer"> <div id="cyler"> <div class="cy1" style="background-image:url(images/Keggy_Banner_Ie.jpg); back ...

Monitor modifications to documents and their respective sub-collections in Firebase Cloud Functions

Is it possible to run a function when there is a change in either a document within the parent collection or a document within one of its subcollections? I have tried using the code provided in the Firebase documentation, but it only triggers when a docume ...