Convert Scala To Java: Java Explained

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Scala and Java are two of the most popular programming languages used in the software development community. Users of Scala often choose to convert the platform to Java for a variety of reasons. If you’re considering making the switch, this guide will explain the basics of Java and provide you with information about the benefits and challenges of migrating from Scala to Java, as well as best practices for making the transition.

Understanding the Basics of Java

Java is an object-oriented, cross-platform language used to create various applications across the web, desktop, and mobile devices. What makes Java so popular is its flexibility — it can be used for big data solutions, game development, server-side solutions, mobile apps, web apps and more. Its easy-to-understand concepts allow developers to design complicated projects without having to worry about their code becoming too complicated.

One of the key concepts of Java is its write once, run anywhere architecture. This means that once written, the code can be compiled into a “bytecode”, which can then run on any operating system or device that supports the Java virtual machine (JVM). This is in stark contrast to other languages such as C++, which must be compiled for each specific operating system and device.

Java is also known for its robust security features, which make it a great choice for developing applications that require a high level of security. Java also has a large library of pre-built classes and functions, which makes it easy to develop applications quickly and efficiently.

Comparing Scala and Java

Scala and Java are both popular programming languages, but they have some key differences that developers need to understand when making the transition from one platform to the other.

Scala is a language based on Java Virtual Machine (JVM). It is a highly functional language and can run on any JVM. It is faster than Java at certain tasks but also slower in certain tasks — especially when dealing with dealing with I/O tasks. Scala also makes use of type inference, which allows developers to write code more quickly, however it also means that errors are easier to miss than with explicit types such as Java.

In comparison, Java is an object-oriented language which focuses on the runtime performance of applications. It is heavily optimized to provide a more fast and efficient programming experience and makes use of explicit types which make errors easier to spot. It is also less optimized than Scala when it comes to I/O tasks.

Advantages of Converting from Scala to Java

One of the main advantages of converting from Scala to Java is the availability of libraries. With over 9 million developers worldwide, Java has a large support community that provides resources for developers through tools, libraries and frameworks. This makes it easier for developers to find solutions for their specific development needs — such as debugging or scaling solutions — quickly and with relative ease.

There are a large number of job opportunities for Java developers as well. As Java is one of the most popular languages in use today, it offers great security in terms of job opportunities available. Additionally, because most employers require applicants to know at least one language, having experience with both Scala and Java can make your profile even more attractive.

Challenges of Transitioning from Scala to Java

Making the transition from Scala to Java can be difficult if you are not familiar with the syntax and concepts of the language. Additionally, due to different coding paradigms between the two languages, code may need to be refactored when converting from one language to the other. This means understanding how both languages work — as well as how changes may impact performance — will be essential when making the switch.

Another challenge when transitioning from Scala to Java can be understanding concepts related to different coding standards between the two languages. For instance, Scala has the concept of type inference which may be difficult for new Java developers to grasp. Additionally, certain features from Scala such as pattern matching and polymorphism may be difficult to replicate when coding in Java.

Tips for Efficiently Converting from Scala to Java

When transitioning from Scala to Java, there are a few tips that can help you make the process more efficient.

  • Start small with simple projects: Before taking on a large-scale project, start with some simple projects to get used to the nuances of Java and become familiar with syntactical differences between the two languages.
  • Break up the project into smaller pieces: Jumping into a big project all at once can be overwhelming. Break up larger tasks into smaller chunks so you don’t become overwhelmed by the process.
  • Utilize tools for automation: Automation tools like j2e can help automate the process of converting code from one platform to another.

Refactoring Patterns for Scala to Java Conversion

When making the transition from Scala to Java there are several refactoring patterns that can help make the process more efficient. One such pattern is Object-Relational Mapping (ORM), which enables developers to convert complex objects in Scala into simpler ones in Java. For example, converting Scala Option into Java Optional can make things much easier. Additionally, using the Strategy pattern can help you minimize changes when moving code between the two languages.

Best Practices for Migrating from Scala to Java

There are some best practices that developers should consider when making the switch from Scala to Java:

  • Keep source files separate: It’s important to keep the source files for each language in separate folders or files so there is not confusion between them.
  • Test your code: Before deploying your application it is important to thoroughly test your code for errors or bugs.
  • Utilize APIs: Using APIs can help maintain compatibility between platforms while making development more efficient.

Frameworks and Tools for Converting from Scala to Java

There are several frameworks and tools available that make it easier for developers to convert their code from one platform to another with relative ease. Anton Keks’ j2e tool provides automated help with converting specific lines of code without manually having to rewrite them. JTransform (ScalaTransformers) is another tool that helps automate the transforming process between the two languages. It can help developers quickly convert code snippets between platforms in an efficient manner.

Common Pitfalls of Translating from Scala to Java

When making the transition from one language to another developers should be aware of some common pitfalls. One key thing to keep an eye out for when converting code between platforms is typos and syntax errors — which are easily missed due to type inference in Scala and null pointer exceptions in Java. Additionally, when converting code some libraries may not be compatible across platforms — due to different implementations — so make sure you check your libraries prior to deployment.


Making the transition from one language — such as Scala — to another — like Java — can be an intimidating process. However, by understanding how both languages work and utilizing tools such as j2e and JTransform developers can make the process more efficient. Additionally, taking advantage of job opportunities available in both fields is made easier by understanding how both languages work when switching platforms.

Anand Das

Anand Das

Anand is Co-founder and CTO of Bito. He leads technical strategy and engineering, and is our biggest user! Formerly, Anand was CTO of Eyeota, a data company acquired by Dun & Bradstreet. He is co-founder of PubMatic, where he led the building of an ad exchange system that handles over 1 Trillion bids per day.

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