Apache Commons Series
Last updated: May 3, 2024
Mocking is an essential part of unit testing, and the Mockito library makes it easy to write clean and intuitive unit tests for your Java code.
Get started with mocking and improve your application tests using our Mockito guide:
Handling concurrency in an application can be a tricky process with many potential pitfalls. A solid grasp of the fundamentals will go a long way to help minimize these issues.
Get started with understanding multi-threaded applications with our Java Concurrency guide:
Spring 5 added support for reactive programming with the Spring WebFlux module, which has been improved upon ever since. Get started with the Reactor project basics and reactive programming in Spring Boot:
Since its introduction in Java 8, the Stream API has become a staple of Java development. The basic operations like iterating, filtering, mapping sequences of elements are deceptively simple to use.
But these can also be overused and fall into some common pitfalls.
To get a better understanding on how Streams work and how to combine them with other language features, check out our guide to Java Streams:
Explore Spring Boot 3 and Spring 6 in-depth through building a full REST API with the framework:
Yes, Spring Security can be complex, from the more advanced functionality within the Core to the deep OAuth support in the framework.
I built the security material as two full courses - Core and OAuth, to get practical with these more complex scenarios. We explore when and how to use each feature and code through it on the backing project.
You can explore the course here:
Spring Data JPA is a great way to handle the complexity of JPA with the powerful simplicity of Spring Boot.
Get started with Spring Data JPA through the guided reference course:
Refactor Java code safely — and automatically — with OpenRewrite.
Refactoring big codebases by hand is slow, risky, and easy to put off. That’s where OpenRewrite comes in. The open-source framework for large-scale, automated code transformations helps teams modernize safely and consistently.
Each month, the creators and maintainers of OpenRewrite at Moderne run live, hands-on training sessions — one for newcomers and one for experienced users. You’ll see how recipes work, how to apply them across projects, and how to modernize code with confidence.
Join the next session, bring your questions, and learn how to automate the kind of work that usually eats your sprint time.
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Apache Commons Lang and String
- An Introduction to Apache Commons Lang 3
- String Processing with Apache Commons Lang 3
- Check If a String Is Numeric in Java
- Remove or Replace Part of a String in Java
- Checking for Empty or Blank Strings in Java
- Converting a List to String in Java
- Pad a String with Zeros or Spaces in Java
- Convert a Comma Separated String to a List in Java
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Apache Commons Lang and Array
- How to Reverse an Array in Java
- Concatenate Two Arrays in Java
- Combining Two or More Byte Arrays
- Array to String Conversions
- Slicing Arrays in Java
- How to Copy an Array in Java
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Apache Commons Lang and Dates
- Parsing Date Strings with Varying Formats
- Convert String to Date in Java
- Increment Date in Java
- Checking if Two Java Dates Are on the Same Day
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Apache Commons Collections
- A Guide to Apache Commons Collections CollectionUtils
- Converting Between an Array and a List in Java
- Partition a List in Java
- Immutable ArrayList in Java
- Converting Between a List and a Set in Java
- How to Convert List to Map in Java
- Apache Commons Collections MapUtils
- Guide to Apache Commons MultiValuedMap
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Apache Commons IO
- Apache Commons IO
- Java – Create a File
- Java – Write an InputStream to a File
- Java – Convert File to InputStream
- Java String to InputStream
- Java InputStream to String
- Convert File to Byte Array in Java
- How to Get the File Extension of a File in Java
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Apache Commons Codec
- Converting Between Byte Arrays and Hexadecimal Strings in Java
- Java Base64 Encoding and Decoding
- Hex Representation of a SHA-1 Digest of a String in Java
- Java Convert PDF to Base64
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Other Apache Commons Projects
- Intro to the Apache Commons CLI
- Apache Commons BeanUtils
- Introduction to Apache Commons CSV
- A Guide to Apache Commons DbUtils
- Spring and Apache FileUpload
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