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Spring Full-Stack Practical Cases

Full-stack Java development with Vue 2/3 front-end suite; hands-on examples and source code analysis for Spring, Spring Boot 2/3, and Spring Cloud.

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Latest from Spring Full-Stack Practical Cases

100 recent articles max

Spring Full-Stack Practical Cases

Aug 19, 2026 · Backend Development

PDFBox: A Powerful Open‑Source Java Library for PDF Manipulation

This article introduces Apache PDFBox, an open‑source Java library for creating, modifying, and extracting content from PDFs, and provides step‑by‑step Spring Boot 3.5 examples covering text extraction, region extraction, metadata handling, image insertion, form creation, JavaScript actions, and bookmark generation.

JavaPDF manipulationPDF processing

0 likes · 17 min read

PDFBox: A Powerful Open‑Source Java Library for PDF Manipulation

Spring Full-Stack Practical Cases

Aug 17, 2026 · Backend Development

Two Ways to Encrypt Fields in Spring Boot: @Convert and Oracle DBMS_CRYPTO

The article explains why encrypting sensitive fields such as phone numbers and ID cards is essential, then walks through two concrete implementations for Spring Boot 3.5.0—an application‑layer solution using @Convert with a custom AttributeConverter and a database‑layer solution using Oracle's DBMS_CRYPTO with @ColumnTransformer—complete with code, setup steps, and test results.

@ColumnTransformer@ConvertAttributeConverter

0 likes · 8 min read

Two Ways to Encrypt Fields in Spring Boot: @Convert and Oracle DBMS_CRYPTO

Spring Full-Stack Practical Cases

Aug 13, 2026 · Backend Development

Discover Spring Boot’s New BeanFactoryInitializer – Early Bean Initialization Made Easy

Spring Boot 3.5 introduces the BeanFactoryInitializer extension point, allowing developers to safely pre‑instantiate specific beans before the regular singleton pool, replace unsafe BeanFactoryPostProcessor hacks, fetch remote configurations, and programmatically register @Tool‑annotated beans, all demonstrated with concrete code examples and a working test.

BeanFactoryInitializerFactoryBeanJava

0 likes · 8 min read

Discover Spring Boot’s New BeanFactoryInitializer – Early Bean Initialization Made Easy

Spring Full-Stack Practical Cases

Jul 22, 2026 · Backend Development

5 Spring Boot Transaction Optimizations That Drastically Boost Performance

This article examines five practical ways to improve Spring Boot 3.5.0 transaction performance—read‑only transactions, explicit propagation settings, correctly sized HikariCP pools, JDBC prepared‑statement caching, and Hibernate batch writes—showing the underlying overhead and providing concrete code and configuration examples.

HikariCPJPASpring Boot

0 likes · 13 min read

5 Spring Boot Transaction Optimizations That Drastically Boost Performance

Spring Full-Stack Practical Cases

Jul 21, 2026 · Backend Development

Cut Memory Usage by 90%: Spring Boot Streams Massive JSON from 220 MB to 22 MB

By replacing the naive List‑based deserialization with Jackson’s JsonParser streaming in Spring Boot 3.5.0, the article shows how processing ~300 k Student records can cut peak heap from 220 MB to 22 MB, avoiding OOM while filtering records on the fly.

JacksonJavaJsonParser

0 likes · 8 min read

Cut Memory Usage by 90%: Spring Boot Streams Massive JSON from 220 MB to 22 MB

Spring Full-Stack Practical Cases

Jul 20, 2026 · Information Security

Simplify Password Validation with Passay: One‑Line Security in Java

This article shows how the open‑source Passay library replaces hand‑written password regex with a unified, extensible rule set, covering dependency setup, rule definitions, custom messages, N‑of‑M character requirements, history checks, and password generation, all demonstrated with runnable Java code.

JavaPassayPassword Validation

0 likes · 18 min read

Simplify Password Validation with Passay: One‑Line Security in Java

Spring Full-Stack Practical Cases

Jul 19, 2026 · Backend Development

8 Java File‑Writing Techniques for Large Files, High Concurrency, and Cross‑Platform Scenarios

This article walks through eight Java file‑writing approaches—from the modern Files.writeString() API to low‑level FileChannel and asynchronous channels—detailing their parameters, performance characteristics, and ideal use cases such as large files, high‑throughput logging, and cross‑platform line handling.

JavaNIOSpring Boot

0 likes · 10 min read

8 Java File‑Writing Techniques for Large Files, High Concurrency, and Cross‑Platform Scenarios

Spring Full-Stack Practical Cases

Jul 18, 2026 · Backend Development

One Annotation to Elegantly Bind Custom Objects in Spring Boot

This article demonstrates three ways to bind a custom Author object from a single comma‑separated string in Spring Boot 3.5.0 using a custom ConversionService, a PropertyEditor, and the @ConfigurationPropertiesBinding annotation, complete with code samples and resulting output.

ConfigurationPropertiesConfigurationPropertiesBindingConversionService

0 likes · 6 min read

One Annotation to Elegantly Bind Custom Objects in Spring Boot

Spring Full-Stack Practical Cases

Jul 17, 2026 · Backend Development

Tackle Complex JSON in Spring Boot with a Single JsonPath Annotation

This article explains how to simplify handling deeply nested JSON responses in Spring Boot by creating a custom @JsonPath annotation that leverages JsonPath expressions, allowing one‑line extraction, filtering, and modification of JSON data directly in controller method parameters.

Argument ResolverCustom AnnotationJSON Parsing

0 likes · 10 min read

Tackle Complex JSON in Spring Boot with a Single JsonPath Annotation

Spring Full-Stack Practical Cases

Jul 16, 2026 · Fundamentals

Double or BigDecimal for Monetary Fields? Precision and Performance Trade‑offs

The article dissects the long‑standing Java debate over using double versus BigDecimal for money, explaining that the choice hinges on required precision, rounding rules, and performance limits, and walks through floating‑point fundamentals, common pitfalls, and high‑accuracy summation techniques.

BigDecimalIEEE754Java

0 likes · 19 min read

Double or BigDecimal for Monetary Fields? Precision and Performance Trade‑offs