Transition Guide Camuda 7 Java-EE to Spring-Boot?

Camunda 7 Topics Discussion & Questions
1

Hi all,

we are currently moving our processes from Java-EE to Spring-Boot.
Is there an official guide / best practices / examples on how to do this?
For example:

  • @Named(“xyz”) in Java-EE should be replaced by @Component(“xyz”) in Spring Boot,
  • For DI, Inject should be replaced by Autowired or better by using RequiredArgsConstructor
  • ProcessVariable in Java-EE should be replaced by ??? in Spring Boot, etc.
  • Examples on how to transition the test cases?
  • What can be improved regarding CPU, Memory and Performance?
  • etc.

Thank you in advance for your Help!
Best regards,
Zenon

2

Hello Zenon,

Moving from Java EE to Spring Boot is a common migration path for many organizations. While there isn’t an official guide specifically for transitioning Camunda processes from Java EE to Spring Boot, I can provide you with some general best practices and guidelines to help you with the migration process.

  1. Dependency Injection (DI):
  • In Spring Boot, you can use @Autowired for dependency injection. It is the equivalent of the @Inject annotation in Java EE. You can annotate fields, constructors, or setter methods with @Autowired to inject dependencies.
  • Another approach you mentioned is using Lombok’s @RequiredArgsConstructor. It can be used on a class to automatically generate a constructor with required arguments for all final fields.
  1. Component Annotations:
  • In Spring Boot, you can use @Component or more specific annotations like @Service or @Repository to annotate your classes for component scanning and automatic bean registration. These annotations serve similar purposes as @Named in Java EE.
  1. Process Variables:
  • In Spring Boot, you can use various approaches for handling process variables in Camunda.
  • One common approach is to use POJOs (Plain Old Java Objects) as process variables. You can define a class representing your process variable, and Camunda will automatically serialize and deserialize the object when interacting with the process engine.
  • Another option is to use Camunda’s built-in support for JSON serialization/deserialization. You can annotate your process variable class with @JsonDeserialize and @JsonSerialize annotations to customize the serialization/deserialization process.
  1. Test Cases:
  • When transitioning test cases, you’ll need to update the test setup and dependencies accordingly. Spring Boot provides various testing utilities and annotations such as @SpringBootTest and @MockBean to facilitate testing. You can use these annotations in conjunction with Camunda’s testing utilities to write unit tests and integration tests for your Camunda processes.
  1. Performance Optimization:
  • To improve CPU, memory, and performance, you can consider the following:
    • Optimize your process models to minimize unnecessary activities or tasks.
    • Review and optimize your SQL queries if you’re using the Camunda database.
    • Leverage Camunda’s caching mechanisms and tune them based on your specific requirements.
    • Implement asynchronous service tasks to offload heavy processing to external systems.
    • Monitor and analyze your system’s performance using tools like Spring Boot Actuator, Camunda Optimize, or other performance monitoring solutions.

While these are general guidelines, it’s important to keep in mind that the specific requirements and intricacies of your application may require additional considerations.

Good luck with your migration, and feel free to ask if you have any further questions!

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