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A guide to help you easily retrieve variables from Flowable's runtime service using Spring Boot, featuring step-by-step instructions and best practices.
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How to Retrieve Variables from Flowable Runtime Service in Spring Boot

In the world of process automation, leveraging a workflow engine like Flowable can be incredibly beneficial. However, one challenge many developers face is how to efficiently retrieve variables that are inserted at the beginning of a process. If you find yourself wrestling with this question while using Spring Boot, you're not alone! In this guide, we'll explore a clear and concise solution to this problem.

Understanding the Problem

When you start a process instance in Flowable, it's common to pass some initial variables to that process. For instance, you might want to pass data such as client information or transaction details. Once you’ve started the process, you may need to retrieve these variables later using Flowable's RuntimeService.

You may find yourself wondering: How can I retrieve these variables effectively? Specifically, a common roadblock is figuring out how to obtain the execution ID needed to fetch the variables.

Proposed Solution

Let's break down the solution into manageable steps.

1. Starting the Process with Variables

First, it's essential to ensure that you're correctly starting the process and inserting the necessary variables. Below is an example of how to start a process and include variables:

[[See Video to Reveal this Text or Code Snippet]]

In this code snippet:

An instance of RuntimeService is injected.

When starting the process (startProcessInstanceByKey), a JSON representation of clientData is passed as a variable.

2. Retrieving the Execution ID

The key to retrieving the process variables is knowing the execution ID. The good news is that the execution ID is essentially the process instance ID that you just started. Since you don't have an explicit method to capture this ID from startProcessInstanceByKey, you'll need to adjust how you manage process instances.

3. Using getVariables Method

Once you have the execution ID, you can retrieve the variables. Here’s how to implement the getVariables method:

[[See Video to Reveal this Text or Code Snippet]]

In this method:

The executionId is passed as a parameter.

Using getVariable, you can fetch the value you stored earlier in the process.

4. Conclusion

By following these steps, you can successfully retrieve variables from the Flowable runtime service using Spring Boot. Remember that the execution ID is crucial for accessing the variables you set earlier in the process.

Key Takeaways

Always ensure you start your process with the necessary variables using startProcessInstanceByKey.

Recognize that the execution ID (or process instance ID) is essential for retrieving any stored variables.

Use the getVariable method of RuntimeService to access your variables later.

By understanding these concepts, you’ll be better equipped to manage your workflow processes and make your applications more efficient. Happy coding!