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Technical Articles

Java

javaTutorial

How to log more information against non-200 HTTP responses

This article aims to provide a method for recording request methods, paths, and response status codes to independent log files for non-200 HTTP responses in Spring Boot applications. By configuring Logback, we can filter logs based on HTTP response status codes and output them to specific log files, which facilitates error checking and monitoring, while avoiding contaminating normal business logs.

Aug 11, 2025 pm 04:36 PM

Professional guide to fix RestAssured dependency resolution errors

This tutorial aims to resolve common io.restassured.RestAssured cannot be resolved errors in Java projects, especially when using IDEs such as Maven and Eclipse. The article will analyze in depth the error is usually caused by Maven local repository corruption, network problems or IDE synchronization exceptions, and provides a system solution. The core is to clean up and rebuild local dependencies through the mvn dependency:purge-local-repository command, supplemented by IDE project updates, ensuring the correct loading and parsing of the RestAssured library.

Aug 11, 2025 pm 04:18 PM

How to create and use an array in Java

TocreateanduseanarrayinJava,firstdeclarethearraywiththedatatypeandsquarebrackets,theninstantiateitwiththenewkeywordorinitializeitdirectlywithvalues;1.DeclareandcreateanarrayusingdataType[]arrayName=newdataType[size];or2.InitializedirectlywithdataType

Aug 11, 2025 pm 04:00 PM

java array

Connecting to Databases in Java using JDBC and Connection Pooling

Using JDBC to cooperate with connection pools (such as HikariCP) is the correct way to efficiently connect to databases in Java; 1. Add HikariCP and database driver dependencies; 2. Configure HikariCP data source and set connection pool parameters; 3. Get the connection through dataSource.getConnection() and execute SQL in try-with-resources; 4. Follow best practices such as using PreparedStatement, reasonably configuring pool size, and setting timeouts to avoid resource leakage and performance problems, and ultimately ensure that database operations are efficient and safely ended.

Aug 11, 2025 pm 03:56 PM

connection pool jdbc

What is the difference between the Comparable and Comparator interfaces in Java?

Comparabledefinesaclass'snaturalorderingbyimplementingcompareTo()withintheclass,enablingdefaultsorting.2.Comparatorprovidesexternal,flexibleorderingviacompare(),allowingmultiplesortstrategieswithoutmodifyingtheclass.3.UseComparableforobvious,singlena

Aug 11, 2025 pm 03:53 PM

How to check if two arrays are equal in Java

To check whether two arrays in Java are equal, you must use the Arrays.equals() or Arrays.deepEquals() method; for one-dimensional arrays, use Arrays.equals(), it compares the length and the value of each element; for two-dimensional or higher-dimensional arrays, use Arrays.deepEquals(), it recursively compares nested arrays; for custom arrays of objects, make sure to override the equals() method; do not use the == operator, because it only compares reference addresses; manual loop comparisons are feasible but not recommended.

Aug 11, 2025 pm 03:50 PM

How to read a properties file in Java

First, use the java.util.Properties class to load the configuration file, 1. Create the config.properties file and put it in the src/main/resources directory or specify the path; 2. It is recommended to load from the classpath through ClassLoader.getResourceAsStream() to ensure that the resources are read correctly; 3. If the file is in the file system, use FileInputStream to specify the absolute or relative path; 4. Always use try-with-resources to automatically close the stream; 5. Check whether the input stream is null to avoid exceptions; 6. Use getProperty(key) to obtain

Aug 11, 2025 pm 03:25 PM

How to implement a CompletableFuture in Java

CompletableFutureinJavaenablesasynchronousprogrammingusingmethodslikerunAsync()fortaskswithoutreturnvaluesandsupplyAsync()forthosewithresults,optionallywithacustomExecutor.2.OperationscanbechainedwiththenApply()totransformresults,thenAccept()toconsum

Aug 11, 2025 pm 03:04 PM

Spring Boot vs Quarkus: A Performance Benchmark for Modern Java

QuarkushassignificantlyfasterstartuptimesthanSpringBoot,especiallyinnativemodewhereitachievessub-50msstartupsbyperforminginitializationatbuildtime,makingitidealforserverlessandKubernetesenvironments.2.Quarkususeslessmemory—30–70MBinnativemodeversus20

Aug 11, 2025 pm 02:59 PM

what is method overloading and overriding in java

MethodoverloadingandoverridingaretwodistinctconceptsinJavathatenablepolymorphism.1.Methodoverloadingoccursinthesameclasswhenmultiplemethodssharethesamenamebuthavedifferentparameters(intype,number,ororder),enablingcompile-timepolymorphism;thereturntyp

Aug 11, 2025 pm 02:51 PM

How to get a value from a HashMap in Java

To get the value from the Java HashMap, you need to use the get() method; 1. Call map.get(key) to get the corresponding value according to the key, and return null if the key does not exist; 2. You can first call map.containsKey(key) to determine whether the key exists to distinguish missing keys from null values; 3. Use generics to ensure type safety and avoid casting; 4. Pay attention to the equals() comparison rules of the key, such as string keys are case-sensitive and must match exactly. Proper handling of null avoids potential errors.

Aug 11, 2025 pm 02:50 PM

How do you create a thread in Java?

YoucancreateathreadinJavabyextendingtheThreadclassorimplementingtheRunnableinterface.2.ExtendingThreadinvolvescreatingaclassthatoverridestherun()methodandcallingstart()onaninstance.3.ImplementingRunnablerequiresdefiningtherun()methodinaclassthatimple

Aug 11, 2025 pm 01:34 PM

java thread

How to Handle Distributed Transactions in a Java Microservices Architecture

Distributedtransactionsarehardinmicroservicesduetoisolateddatabases,makingACIDtransactionsacrossservicesimpossible.2.UsetheSagapatterntomanagelong-runningtransactionswithlocaltransactionsandcompensatingactions,eitherorchestratedorchoreographed.3.Embr

Aug 11, 2025 pm 12:35 PM

Distributed transactions java microservices

How to manage dependencies with Maven for a Java project?

The core of managing Maven dependencies is to correctly configure the pom.xml file. 1. Understand the pom.xml structure, where groupId, artifactId, version and scope define dependencies; 2. When adding dependency, insert dependency blocks in it, and remove corresponding blocks when deleting; 3. Use compile, test, provided, runtime and other scopes to control the classpath scope; 4. Analyze the dependency tree through mvndependency:tree, use exclusivity to eliminate conflicting dependencies or use a unified version; 5. Use centralized management versions to avoid inconsistencies in multi-module projects; 6. Manually or through Versions insert

Aug 11, 2025 pm 12:30 PM

maven Dependency management