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Selected Java Interview Questions

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Latest from Selected Java Interview Questions

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Selected Java Interview Questions

Feb 26, 2026 · Backend Development

Why Your Snowflake‑Like ID Generator May Duplicate IDs Under High Concurrency

The article analyzes a custom TraceIdGenerator that uses a simple AtomicInteger counter and IP‑based prefix, identifying how its reset logic and CAS competition can cause duplicate IDs in high‑concurrency scenarios, and proposes timestamp checks, larger ranges, retry mechanisms, and true Snowflake implementation as solutions.

AtomicIntegerID generationJava

0 likes · 11 min read

Why Your Snowflake‑Like ID Generator May Duplicate IDs Under High Concurrency

Selected Java Interview Questions

Feb 21, 2026 · Backend Development

Boost Spring Boot Startup Speed with Spring Data AOT Repositories

Spring Data AOT Repositories, introduced in Spring Boot 4, move repository parsing and query generation from runtime to compile time, dramatically reducing startup time, memory usage, and enabling early detection of method‑name or JPQL errors for large Java backend applications.

AoTBackendJava

0 likes · 6 min read

Boost Spring Boot Startup Speed with Spring Data AOT Repositories

Selected Java Interview Questions

Feb 14, 2026 · Backend Development

Master Dynamic Table Names in MyBatis‑Plus with a Simple Starter

This article introduces an open‑source MyBatis‑Plus dynamic‑table starter, explains why dynamic table names are needed for large‑scale data, outlines its key features, provides step‑by‑step installation and quick‑start instructions, demonstrates advanced usage, debugging tips, FAQs, and real‑world scenarios.

Dynamic TableJavaMyBatis-Plus

0 likes · 9 min read

Master Dynamic Table Names in MyBatis‑Plus with a Simple Starter

Selected Java Interview Questions

Feb 4, 2026 · Databases

How to Handle Pagination Across Sharded Databases Without Performance Pitfalls

This article explains why pagination only becomes complex when queries span multiple database shards, compares three mainstream solutions—including middleware, open‑source frameworks, and business compromises—highlights the pitfalls of global search for deep pages, and recommends sequential paging based on the previous page’s max ID, with interview‑ready STAR guidance.

InterviewShardingpagination

0 likes · 7 min read

How to Handle Pagination Across Sharded Databases Without Performance Pitfalls

Selected Java Interview Questions

Feb 3, 2026 · Backend Development

Boost Your Java Projects: One‑Click Maven Multi‑Module Generation

This article introduces a lightweight IntelliJ IDEA plugin that automates the creation of Maven multi‑module projects, detailing its core features, installation methods, step‑by‑step usage, customization options, dependency handling, troubleshooting tips, and how to build and extend the plugin from source.

IntelliJ IDEAJavaMaven

0 likes · 11 min read

Boost Your Java Projects: One‑Click Maven Multi‑Module Generation

Selected Java Interview Questions

Jan 30, 2026 · Backend Development

When to Use Git Merge vs Rebase: A Practical Comparison

This article walks through a common development scenario where two feature branches diverge from master, demonstrating how merge and rebase handle integration, conflict resolution, and commit history, and provides guidance on when each strategy is appropriate.

Version Controlconflict resolutiongit

0 likes · 7 min read

When to Use Git Merge vs Rebase: A Practical Comparison

Selected Java Interview Questions

Jan 27, 2026 · Backend Development

Why Does @Transactional(REQUIRES_NEW) Still Roll Back Your Audit Log?

When a Spring @Transactional method with REQUIRES_NEW fails to persist audit logs after a rollback, the issue often stems from misconfigured rollback rules, caught exceptions, self‑invocation, non‑public or final methods, or incorrect propagation settings, all of which prevent the new transaction from committing.

JavaProxyREQUIRES_NEW

0 likes · 7 min read

Why Does @Transactional(REQUIRES_NEW) Still Roll Back Your Audit Log?

Selected Java Interview Questions

Jan 25, 2026 · Backend Development

How to Build and Run Complex Java Workflows with Easy Work

This guide introduces Easy Work, a Java workflow engine, explains its core concepts, shows how to create custom Work units, assemble repeat, sequential, parallel, and conditional flows, pause execution with breakpoints, and define workflows in JSON with complete code examples.

BackendCode ExampleJSON

0 likes · 6 min read

How to Build and Run Complex Java Workflows with Easy Work

Selected Java Interview Questions

Jan 20, 2026 · Backend Development

How to Diagnose and Fix Maven Dependency Conflicts (NoSuchMethodError & ClassNotFoundException)

This guide explains why Maven dependency conflicts cause errors like NoSuchMethodError and ClassNotFoundException, shows step‑by‑step commands to inspect the dependency tree, and provides three practical ways—exclusions, forced versions, and dependencyManagement—to resolve and prevent such conflicts in Java projects.

BOMClassNotFoundExceptionDependency Conflict

0 likes · 7 min read

How to Diagnose and Fix Maven Dependency Conflicts (NoSuchMethodError & ClassNotFoundException)

Selected Java Interview Questions

Jan 18, 2026 · Backend Development

How to Seamlessly Integrate Arthas into Spring Boot for Real‑Time Monitoring

This guide explains how to embed the Arthas online monitoring tool into a Spring Boot application using the Arthas Spring Boot Starter, configure telnet and HTTP ports, access the console via terminal or web, and extend debugging across multiple services with Arthas Tunnel while addressing security considerations.

ArthasDebuggingJava

0 likes · 12 min read

How to Seamlessly Integrate Arthas into Spring Boot for Real‑Time Monitoring