Question 1

How many questions are on the Java SE 21 Developer exam?

Accepted Answer

Our record lists 50 questions for the Java SE 21 Developer. The vendor does not publish a question count, so treat that as a working figure rather than an official specification.

Question 2

How long do you have to complete the Java SE 21 Developer exam?

Accepted Answer

Our record lists 120 minutes, roughly 144 seconds per question. The vendor does not publish a duration for this exam, so use it as a planning figure.

Question 3

What score do you need to pass the Java SE 21 Developer exam?

Accepted Answer

Our record lists 68% as the pass mark for the Java SE 21 Developer. Most certification bodies do not publish a numeric cut score, so treat this as our benchmark rather than an official threshold.

Question 4

What are the domains on the Java SE 21 Developer exam?

Accepted Answer

There are 11 domains: Concurrency, Localization, I/O and NIO.2, Handling Exceptions, Supplementary Topics, Arrays and Collections, Modules and Deployment, Controlling Program Flow, Object-Oriented Concepts, Streams and Lambda Expressions, Handling Date, Time, Text, Numeric and Boolean Values. The official weights are Concurrency 15%, Localization 4%, I/O and NIO.2 6%, Handling Exceptions 7%, Supplementary Topics 4%, Arrays and Collections 10%, Modules and Deployment 7%, Controlling Program Flow 5%, Object-Oriented Concepts 22%, Streams and Lambda Expressions 12%, Handling Date, Time, Text, Numeric and Boolean Values 8%.

Question 5

How should I use the domain weights when revising?

Accepted Answer

Weight by percentage, not by domain. 15% is the one where lost points cost you the most, and Certilum scores you per domain so you can see exactly where that is.

Question 6

Does Certilum have practice questions for the Java SE 21 Developer exam?

Accepted Answer

Yes: 50 questions in our bank for this certification, each tagged to the exam domain it belongs to, with the official domain weights applied.

Specification	Value
Questions	50
Time limit	120 minutes (144s per question)
Passing score	68%
Domains	11
Level	Professional
Question bank here	50 questions
Source	Certilum's own record — the vendor does not publish this figure

Java SE 21 Developer Exam Format

Exam facts at a glance

Official domain weights

More about the Java SE 21 Developer exam

Related certifications

Frequently asked questions

Domain	Weight	Topics	Practice Qs
Concurrency	15%	Platform and virtual threads Runnable and Callable objects Thread lifecycle and Executor services +2 more	8
Localization	4%	Locales and resource bundles Parsing and formatting dates, times, numbers, currency	2
I/O and NIO.2	6%	Console and file I/O streams Serialization and deserialization Path objects and java.nio.file API	3
Handling Exceptions	7%	try/catch/finally, try-with-resources Multi-catch blocks, custom exceptions	4
Supplementary Topics	4%	Java Logging API basics Annotations - Override, FunctionalInterface, Deprecated, SuppressWarnings, SafeVarargs Generics and wildcards	2
Arrays and Collections	10%	Arrays, List, Set, Map, Deque Add, remove, update, retrieve, sort	5
Modules and Deployment	7%	Module definitions and dependencies Expose module content for reflection Services, providers, consumers +2 more	3
Controlling Program Flow	5%	if/else, switch statements and expressions Loops, break and continue	2
Object-Oriented Concepts	22%	Object lifecycle, nested classes, garbage collection Classes, records, static and instance members Overloading and var-arg methods +5 more	11
Streams and Lambda Expressions	12%	Object and primitive Streams Filter, transform, process, sort data Decomposition, concatenation, reduction +1 more	6
Handling Date, Time, Text, Numeric and Boolean Values	8%	Primitives and wrapper classes, Math API String and StringBuilder, text blocks Date-Time API with time zones and daylight saving	4