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Building Cloud-Native Java Applications with Micronaut

Micronautisidealforbuildingcloud-nativeJavaapplicationsduetoitslowmemoryfootprint,faststartuptimes,andcompile-timedependencyinjection,makingitsuperiortotraditionalframeworkslikeSpringBootformicroservices,containers,andserverlessenvironments.1.Microna

Aug 20, 2025 am 01:53 AM

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How to import a package in Java

Usetheimportkeywordtoimportaspecificclass,suchasimportjava.util.ArrayList;touseArrayListdirectly.2.Importallclassesfromapackageusingawildcard,likeimportjava.util.*;,whichincludesallpublicclassesinjava.utilbutnotsubpackages.3.Noimportisneededforclasse

Aug 20, 2025 am 12:16 AM

What is JPA in Java?

JPAisaJavaspecificationthatstandardizesrelationaldatamanagementbyenablingobject-relationalmapping,whereJavaobjectsaremappedtodatabasetablesusingannotationslike@Entityand@Id,allowingdeveloperstoperformdatabaseoperationsthroughtheEntityManagerinterface

Aug 19, 2025 pm 04:13 PM

Understanding Bytecode and the Java Compiler (javac)

Java code is not run directly, but compiled into bytecode through javac; 2. Bytecode is a platform-independent instruction executable by JVM, each instruction is 1 byte long; 3. Javac performs parsing, semantic analysis, generation of bytecode and error reporting; 4. Understanding this process helps to achieve "write once, run everywhere", use Javap to view bytecode during debugging, and optimize performance to avoid redundant object creation. This is the core mechanism of Java security and portability.

Aug 19, 2025 pm 04:09 PM

How to remove from an ArrayList in Java

UseIteratorwithremove()methodtosafelyremoveelementsduringiterationwithoutcausingConcurrentModificationException.2.UseListIteratorforbidirectionaltraversalandremovalwhenmorecontrolisneeded.3.UseremoveIf()methodinJava8 forclean,concisecondition-basedre

Aug 19, 2025 pm 03:38 PM

How to use servlets in Java

TouseservletsinJava,firstsetuptheenvironmentwithJDK,anIDE,andaservletcontainerlikeTomcat;2.CreateaservletclassextendingHttpServletandoverridedoGet()ordoPost()tohandleHTTPrequests;3.Configuretheservletusing@WebServlet("/url")annotationorviaw

Aug 19, 2025 pm 02:17 PM

How to use JAXB for XML binding in Java?

To use JAXB for XML binding, you first need to add dependencies in Java9, then create a Java class with JAXB annotation, and then convert objects and XML through JAXBContext. 1. For Java9 and above, jaxb-api and jaxb-runtime dependencies must be explicitly added; 2. Create a POJO and use @XmlRootElement, @XmlAccessorType, @XmlElement and other annotations to define XML mapping rules; 3. Use JAXBContext and Marshaller to serialize Java objects into XML; 4. Use JAXBContext and Un

Aug 19, 2025 pm 01:48 PM

What is inversion of control in Java?

InversionofControl(IoC)inJavaisadesignprinciplewhereobjectcreationanddependencymanagementaredelegatedtoacontainer,suchasSpring,insteadofbeinghandledbythecodedirectly;thisinversionreducestightcoupling,enhancesmodularity,andimprovestestabilityandmainta

Aug 19, 2025 pm 01:46 PM

java Inversion of control

A Guide to Logging in Java with SLF4J and Logback

SLF4J and Logback are recommended log combinations in Java applications. 1. Add Maven or Gradle dependencies to introduce slf4j-api and logback-classic. 2. Get the Logger instance of SLF4J in the code and use placeholders to record logs. 3. Configure the console and file output format and log levels through logback.xml under src/main/resources. 4. The SpringBoot project recommends using logback-spring.xml to support environmental configuration. 5. Follow the most important aspects of not recording sensitive information, avoiding circular logs, and using log levels.

Aug 19, 2025 pm 01:08 PM

Passing variables across scenarios in Cucumber: a not recommended but feasible solution

This article explores techniques for passing variables across scenarios in Cucumber testing and emphasizes that this practice is usually not recommended. Nevertheless, the article provides a way to achieve this using global variables and introduces the use of the Background keyword as a more appropriate alternative to ensure the independence and maintainability of the test.

Aug 19, 2025 pm 12:48 PM

Troubleshooting and solutions for pre-filled data in Room database

This article explores in-depth common reasons and solutions for Android Room databases to appear empty after pre-populated data. The core problem is that the onCreate method in RoomDatabase.Callback is only executed once the database is first created. The article analyzes this lifecycle behavior in detail and provides a direct way to force database recreation by uninstalling the application or clearing the data. It also introduces tips for verifying data filling and more advanced pre-filling best practices to ensure that developers can correctly implement the initialization and data preloading of Room databases.

Aug 19, 2025 pm 12:39 PM

Practical Guide to Integrating Kotlin Native Executables and JVM Fallback Mechanisms in JAR

This article discusses how to package the multi-platform executable file generated by Kotlin Native compiled and JVM implementation into the same JAR file, and uses Java Native Interface (JNI) to achieve a balance between performance optimization and cross-platform compatibility. By dynamically loading the applicable local library at runtime and gracefully falling back to pure JVM implementations when the local library is unavailable, this solution provides a feasible path for applications that pursue high performance and require a wide range of platform support.

Aug 19, 2025 pm 12:36 PM

what are access modifiers in java

Java has four access modifiers, from high to low to private, default, protected and public, which control the access scope of classes, methods, fields and constructors respectively: private members are only accessible in the same class; default (no modifier) members are accessible in the same package; protected members are accessible in the same package and in subclasses of different packages; public members can be accessed anywhere, and the rational use of these modifiers helps to achieve encapsulation, security and maintainability of code.

Aug 19, 2025 pm 12:34 PM

Room database pre-filled data does not display problem analysis and solution

This article aims to solve the problem that the RecyclerView appears as an empty list after the Room database is pre-populated. The core is to understand the working mechanism of the onCreate method in RoomDatabase.Callback: it is only called when the database is first created. If the database already exists, this callback will not be triggered again even if the previous pre-filling fails. Solutions usually involve uninstalling the application to force database reconstruction, or making judgments at the data layer to ensure data filling.

Aug 19, 2025 pm 12:33 PM