1Z0-830
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Java SE21 Developer
The course prepares candidates for the 1Z0-830 exam, covering Java SE 21 core features, advanced type system, functional and concurrent programming, API enhancements, modules, and testing I/O, ensuring they can develop modern, high‑performance Java applications.
90
Minutes
50
Questions
68
Passing Score
$245
Exam Cost
Who Should Take This
Software engineers, senior developers, and architects with at least three years of Java experience who aim to validate their expertise in Java SE 21 should enroll. The certification supports career advancement, enables eligibility for high‑impact projects, and signals mastery of modern Java language and platform capabilities.
What's Covered
1
Java 21 Core Features
2
Advanced Type System
3
Functional and Concurrent Programming
4
API Enhancements and Modules
5
Advanced I/O and Testing
What's Included in AccelaStudy® AI
Adaptive Knowledge Graph
Practice Questions
Lesson Modules
Console Simulator Labs
Exam Tips & Strategy
20 Activity Formats
Course Outline
62 learning goals
1
Java 21 Core Features
2 topics
Virtual Threads
- Design virtual thread architectures using Thread.ofVirtual() and structured concurrency for high-throughput I/O-bound applications.
- Implement virtual thread executors with Executors.newVirtualThreadPerTaskExecutor for lightweight concurrent task processing.
- Configure structured concurrency with StructuredTaskScope for managing virtual thread lifetimes and error propagation.
- Evaluate virtual threads versus platform threads for different workload patterns including I/O-bound and CPU-bound scenarios.
- Configure Virtual Threads with appropriate settings and parameters for a production deployment scenario in Oracle Certified Professional: Java SE 21 Developer.
- Assess Virtual Threads implementations against best practices to identify gaps and recommend improvements.
- Architect Virtual Threads solutions with scalability patterns and capacity planning for long-term sustainability.
Pattern Matching
- Design pattern matching for switch with type patterns, guarded patterns, and exhaustiveness checking for type-safe dispatch.
- Implement record patterns with nested destructuring for extracting components from record class hierarchies.
- Configure pattern matching with sealed class hierarchies for exhaustive switch expressions with compiler verification.
- Analyze pattern matching code to identify missing cases, guard condition logic, and dominance ordering issues.
- Evaluate Pattern Matching alternatives and tradeoffs to recommend the optimal approach for given constraints.
- Formulate Pattern Matching governance frameworks with policies, standards, and compliance monitoring.
- Explain how to troubleshoot common issues with Pattern Matching including error messages and diagnostic procedures.
2
Advanced Type System
2 topics
Records and Sealed Classes
- Implement record class features including canonical constructors, custom methods, and implementing interfaces.
- Design sealed class hierarchies with permits clause, pattern matching integration, and algebraic data type patterns.
- Configure record components with validation in compact constructors and custom accessor implementations.
- Analyze record and sealed class designs to evaluate immutability guarantees, pattern matching coverage, and API quality.
- Design enterprise-grade Records and Sealed Classes architectures incorporating HA, DR, and security requirements.
- Apply Records and Sealed Classes configuration patterns to meet specific business requirements including compliance needs.
Generics and Collections
- Implement sequenced collection interfaces (SequencedCollection, SequencedSet, SequencedMap) with reversed views.
- Design type-safe APIs with advanced generics including intersection types, recursive bounds, and type witness inference.
- Configure collection operations with SequencedCollection.addFirst/addLast and reversed() for ordered data access.
- Evaluate Java 21 collection APIs versus legacy approaches for different data ordering and access requirements.
- Implement Generics and Collections following best practices for security, performance, and reliability.
- Diagnose Generics and Collections issues by analyzing metrics, logs, and configuration to determine root causes.
3
Functional and Concurrent Programming
2 topics
Advanced Streams
- Design stream pipelines using Java 21 enhancements including stream gatherers and mapMulti for custom transformations.
- Implement stream operations with teeing collectors, flatMap patterns, and parallel stream spliterator customization.
- Configure functional composition with Function.andThen, Predicate.and/or/negate, and Comparator chaining for complex operations.
- Analyze stream pipeline performance to identify unnecessary intermediate operations, boxing overhead, and parallelism issues.
- Analyze Advanced Streams configurations to identify security vulnerabilities, bottlenecks, and optimization opportunities.
- Recommend Advanced Streams optimization strategies balancing performance, cost, and operational complexity.
Advanced Concurrency
- Architect structured concurrency with StructuredTaskScope.ShutdownOnFailure and ShutdownOnSuccess for scoped task management.
- Implement scoped values (ScopedValue) as thread-safe alternatives to ThreadLocal for sharing data across virtual thread tasks.
- Configure concurrent data structures with virtual threads ensuring proper synchronization and non-blocking I/O patterns.
- Evaluate structured concurrency versus CompletableFuture for different async programming patterns and error handling needs.
- Architect Advanced Concurrency solutions with scalability patterns and capacity planning for long-term sustainability.
- Configure Advanced Concurrency with appropriate settings and parameters for a production deployment scenario in Oracle Certified Professional: Java SE 21 Developer.
4
API Enhancements and Modules
2 topics
String and API Updates
- Implement string template expressions (STR, FMT) for type-safe string interpolation with embedded expressions.
- Design API usage with Java 21 enhancements including unnamed patterns, unnamed variables, and improved switch semantics.
- Configure Foreign Function and Memory API for calling native code and managing off-heap memory with safety guarantees.
- Analyze Java 21 API adoption to identify opportunities for modernizing code with new language features and APIs.
- Explain how to troubleshoot common issues with String and API Updates including error messages and diagnostic procedures.
- Evaluate String and API Updates alternatives and tradeoffs to recommend the optimal approach for given constraints.
Module and Platform
- Implement advanced module features including qualified exports, module layers, and migration strategies from classpath.
- Design modular application architectures with service providers, runtime image creation using jlink, and multi-release JARs.
- Configure Java Flight Recorder events for production monitoring, performance profiling, and diagnostic data collection.
- Evaluate module designs to identify dependency issues, reflection access problems, and module graph optimization strategies.
- Compare Module and Platform deployment patterns to determine the best architecture for availability and scalability needs.
- Design enterprise-grade Module and Platform architectures incorporating HA, DR, and security requirements.
5
Advanced I/O and Testing
2 topics
Advanced I/O
- Implement NIO.2 advanced features including asynchronous channels, file locks, and memory-mapped files for high-performance I/O.
- Design serialization strategies with record serialization, custom writeObject/readObject, and serialization filtering for security.
- Configure HTTP Client API with HTTP/2 support, WebSocket, and asynchronous request handling for modern API consumption.
- Evaluate I/O strategies comparing NIO.2 async channels, virtual thread blocking I/O, and reactive approaches for throughput.
- Plan Advanced I/O migration and modernization strategies with phased rollout and rollback procedures.
- Implement Advanced I/O following best practices for security, performance, and reliability.
Testing and Quality
- Design unit testing with JUnit 5 annotations, parameterized tests, and assertions for comprehensive Java code validation.
- Implement test-driven development patterns with mock objects, dependency injection, and test isolation techniques.
- Configure code quality tools including static analysis, code coverage measurement, and API documentation with Javadoc.
- Analyze test coverage and code quality metrics to identify untested paths, complexity hotspots, and quality improvements.
- Deploy Testing and Quality with integration to monitoring, logging, and alerting services for operational visibility.
- Analyze Testing and Quality configurations to identify security vulnerabilities, bottlenecks, and optimization opportunities.
Scope
Included Topics
- All domains in the Oracle Certified Professional: Java SE 21 Developer certification exam guide.
- Core topics: Java 21 Features, Virtual Threads, Pattern Matching, Sequenced Collections, Records, Sealed Classes.
- Oracle services, tools, and best practices relevant to this certification.
- Scenario-based problem solving at the professional level.
Not Covered
- Topics outside the official exam guide scope.
- Programming language specifics beyond the exam requirements.
- Specific pricing values that change over time.
- Third-party products beyond basic integration awareness.
Official Exam Page
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