Name: When to Stream, Collect, and Gather & Demystifying Dependency Injection
Start: 2025-05-22T18:00:00+02:00
End: 2025-05-22T21:00:00+02:00
Location: OpenValue Düsseldorf

**Dear Java Community,**

**After the meetup is before the meetup!**

We’re excited to invite you to the next **OpenValue Meetup** on **May 22nd** in Düsseldorf!

Once again, we've put together an evening of **high-quality tech talks**, food, drinks, and great conversations. This time, we’re diving into two exciting topics— **When to Stream, Collect, and Gather** and **Dependency Injection in modern Java development**.

Join us at our office at **Am Wehrhahn 41, 40211 Düsseldorf**, and connect with fellow developers who share a passion for software craftsmanship and continuous learning.
We’ll take care of **refreshing drinks and tasty food**—you just bring your curiosity and questions!
👉 **Please RSVP to confirm your attendance.**

***

### 🗓️ **Agenda**

* **18:00** – Doors open / Walk-in
* **18:30** – First Talk
* **19:15** – Break
* **19:30** – Second Talk
* **20:15** – Drinks & Discussions

***

### 🎤 **Talks**

#### **When to Stream, Collect, and Gather - Tips for using the Java Stream-API effectively**

**by Cay Horstmann**
Using streams for processing sequences of data can make your programming more concise, but it can also lead to brittle and unmaintainable code. This presentation reviews the goals of the stream API and the collector/gatherer extension points. You will come away with concrete rules when the use of these APIs is beneficial for clarity and performance, and in which situations they are unhelpful.

#### **Demystifying Dependency Injection**

**by Jens Knipper**
Dependency Injection (DI) is a core concept in modern software development—but many developers use it without fully understanding how it works.
Dependency Injection (DI) is an important concept in Software development that helps create cleaner, easier-to-maintain code. In this talk, we’ll explain the basics of DI, how it works, and why it’s useful. DI helps reduce the tight connections between parts of your application by letting frameworks like Spring manage how objects are created and linked together. You’ve probably used DI through annotations like @Autowired, @Inject, or similar. We’ll show you how these annotations work in practice and how they can make your code more flexible and easier to test. Whether you're new to DI or want a clearer understanding, this session will provide the knowledge you need to improve your code.

We're looking forward to another great evening of learning, sharing, and networking—**don’t miss out**!

See you on May 22nd! 👋

Sebastian K.

OpenValue Düsseldorf

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When to Stream, Collect, and Gather & Demystifying Dependency Injection

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When to Stream, Collect, and Gather & Demystifying Dependency Injection

OpenValue Düsseldorf

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