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Solutions for events not passed in callbacks when using LiveData

This article aims to solve the issue where the LiveData value is updated from the callback function when using LiveData in Android development, but the observer does not receive the update event. By analyzing the difference between setValue() and postValue(), the correct way to update LiveData values in different thread environments is explained, and corresponding code examples are provided to help developers avoid such problems.

Aug 20, 2025 am 08:18 AM

Use Mono.error to perform WebClient exception handling unit testing

This article aims to resolve issues encountered when unit testing the doOnError method when using WebClient for requests. Usually, throwing a WebClientResponseException directly cannot trigger exception handling logic in doOnError. This article will explain how to correctly simulate exceptions using Mono.error to ensure that doOnError can be tested effectively.

Aug 20, 2025 am 08:15 AM

Use Selenium to close web ad pop-ups: Advanced Guide

This article aims to provide an effective way to close web ad popups using Selenium WebDriver. When an ad pop-up appears in an iframe, direct targeting and clicking the Close button will usually fail. This article will introduce in detail how to switch to an iframe, close the pop-up window, and switch back to the main document to ensure the smooth progress of the automated testing process.

Aug 20, 2025 am 08:06 AM

Azure Blob storage upload failed: Troubleshooting and solution for permissions

This article aims to help developers solve the "AuthorizationFailure" error encountered when uploading files on Azure Blob storage, that is, the problem of insufficient permissions. By checking and configuring the network settings of Azure storage accounts, especially firewall rules, allowing client IP addresses to access, upload failures due to IP restrictions can be effectively resolved. This article will explain in detail how to make sure your application can interact with Azure Blob storage smoothly.

Aug 20, 2025 am 07:54 AM

How to elegantly stop threads in ExecutorService

This article aims to address how to stop a running thread in timeout or other specific situations when using ExecutorService, while avoiding the complete shutdown of the ExecutorService so that subsequent tasks can still be submitted. We will explore the correct way to use the shutdownNow() method in conjunction with the Thread.interrupted() flag, and how to handle interrupt requests gracefully in Runnable tasks.

Aug 20, 2025 am 07:42 AM

What is the Spring Framework for Java?

TheSpringFrameworkisacomprehensive,open-sourceplatformforbuildingJavaapplications,particularlyenterprise-levelsystems,introducedin2003tosimplifycomplexdevelopmenttasksbyprovidinginfrastructuresupportthatallowsdeveloperstofocusonbusinesslogic.Itachiev

Aug 20, 2025 am 07:27 AM

java

Solve the compatibility issue of block transmission when Apache CXF client sends byte arrays

This article discusses the possible problems that may be encountered when sending a byte array (byte[]) as a REST API request body when using Apache CXF as a JAX-RS implementation. The core challenge is that Apache CXF may use HTTP chunked transmission encoding by default in OpenLiberty environments, and the target service may not support this mode. The article elaborates on the manifestation and root causes of the problem, and provides a professional solution to solve this compatibility problem by enabling chunked transmission support on the receiving server to ensure smooth data transmission.

Aug 20, 2025 am 07:03 AM

How to find all occurrences of a pattern with the Matcher class in Java

Compile regular expressions and create Matcher objects; 2. Use the find() method to find all matches in the loop, and each call will automatically move to the next match; 3. Get matching content and location information through group(), start() and end(); 4. If it is case-insensitive, add the Pattern.CASE_INSENSITIVE flag; finally, using the find() method of Matcher in the loop is a standard way to find all pattern matches in Java.

Aug 20, 2025 am 06:55 AM

How to work with Optional in Java

Using Optional can effectively avoid null pointer exceptions and improve code readability. 1. Create an Optional instance: Use Optional.empty() to represent a null value, Optional.of(value) wraps non-null value, and Optional.ofNullable(value) safely handles values that may be null. 2. Check and get values: Use ifPresent() to perform operations when existing. IfPresentOrElse() supports branch processing whether existing or not in Java9, and avoid not checking isPresent() before calling get() directly. 3. Provide default value: use orElse() to return the default value

Aug 20, 2025 am 06:50 AM

java optional

What is pattern matching for instanceof in Java?

Patternmatchingforinstanceof,introducedasapreviewinJava14andfinalizedinJava16,allowscombiningtypecheckingandcastinginasinglestep,eliminatingredundantcastsandreducingerrors.1.BeforeJava14,developershadtoseparatelycheckthetypewithinstanceofandthenmanua

Aug 20, 2025 am 06:21 AM

How to use functional interfaces in Java

AfunctionalinterfaceinJavaisaninterfacewithexactlyoneabstractmethod,whichcanbeinstantiatedusinglambdaexpressionsormethodreferences;2.Youcancreatecustomfunctionalinterfacesorusebuilt-inonesfromjava.util.functionlikeFunction,Consumer,Supplier,Predicate

Aug 20, 2025 am 05:07 AM

How to implement the observer pattern in Java

TheobserverpatterncanbeimplementedinJavausingeitherthedeprecatedjava.util.ObserverandObservableclassesoracustomimplementation;2.ThelegacyapproachusesObservable'ssetChanged()andnotifyObservers()methodstoalertobserversofstatechanges;3.Amodern,recommend

Aug 20, 2025 am 04:59 AM

java Observer pattern

What is JUnit in Java?

JUnitisawidely-usedopen-sourcetestingframeworkforJavathatenablesdeveloperstowriteandexecuterepeatableunittests,ensuringindividualcomponentslikemethodsorclassesfunctioncorrectlyinisolation.ItbelongstothexUnitfamilyandprovideskeyfeaturessuchasannotatio

Aug 20, 2025 am 03:32 AM

How to work with XML in Java

UsedomparsSMALLTOMEDUMXMLFILESWHENYOUNETOModifythestructureStructythestructureMandomaccesstonodes. swhenMemoryefficiencyiScrucialandyouareOningthedatasequentaly.3.usejaxbforobject-XMLMappingwhenworkingWithpojos, ESPEC

Aug 20, 2025 am 03:28 AM