Recent questions tagged java

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java - Getting input from barcode scanner internally without textbox

I have a barcode scanner and in my java application I have to bring a popup to display all the information ... and read the value there ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Apple MDM Vendor CSR Signing

I hit 'Invalid Certificate Signing Request' when uploading plist to https://identity.apple.com/pushcert/ , and below ... advise. Thanks a lot! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Android: Bitmap to Byte Array and back: SkImageDecoder::Factory returned null

The goal is to convert a Bitmap to a byte [], pass it between activities in a Bundle of data, then ... you would expect with a null bitmap See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Redirect back to a page after a login

I'm doing a simple forum with a series of Servlets that each represent a home, topic, postedit, login ... solutions is perfectly acceptable ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Differences between JVM implementations

Where do JVM Implementations differ (except licensing)? Does every JVM implement Type Erasure for the Generic ... with Tail-Call-Optimization? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Can someone make sense of the G1 garbage collector output?

I am running a Java program with the G1 garbage collector using the following options: -XX:-UseBiasedLocking -XX:+ ... of what is going on? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to configure spring-boot servlet like in web.xml?

I have a simple servlet configuration in web.xml: <servlet> <servlet-name>appServlet</servlet-name> ... it for SpringBootServletInitializer? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Can we use all features of log4j2 if we use it along with slf4j api?

We have migrated all our code to use the slf4 API to use generic APIs, however now we are thinking of ... API and log4j2 as the implementation? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to configure a Spring beans with properties that are stored in a database table

In my project we'd like to externalize the properties of our Spring managed beans, that is very easy to ... or something. Any clues? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - What does CompileThreshold, Tier2CompileThreshold, Tier3CompileThreshold and Tier4CompileThreshold control?

HotSpot's tiered compilation uses the interpreter until a threshold of invocations (for methods) or iterations ( ... compilation is triggered? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Eclipse ADT appcompat... what is it?

I've spent all afternoon getting absolutely nowhere with this. I've downloaded Eclipse, downloaded the SDK, installed ... how to combat this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Using Spring threading and TaskExecutor, how do I know when a thread is finished?

Alright, possible a naive question here. I have a service that needs to log into multiple network devices, run ... . Any help is appreciated. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Why HotSpot will optimize the following using hoisting?

In the "Effective Java", the author mentioned that while (!done) i++; can be optimized by HotSpot into ... why can compiler optimize that way? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Some basic questions about MethodHandle API

How can I obtain all declared method through MethodHandles.lookup()? How can I obtain all declared fields? What is ... mh.invoke(sut); } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to get Facebook photo, full name, gender using Facebook SDK android

I am working on an Android application in which any Android user who is logging to Facebook using our Application, ... I guess. Any thoughts? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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165 views

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java - Understanding servlet container

As a UI devloper and someone with very limited Java knowledge, how do I understand what exactly is servlet ... Could you please help me. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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147 views

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java - Can I use a single war file in multiple environments? Should I?

I have a Java web application at my work and I'd like simplify how we deploy to our DEV, QA, and PROD ... a standard way) to do that? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Why does my Eclipse Luna 4.4 crash on Debian Wheezy 7.4 with Oracle JDK8 64bit?

I have Debian GNU/Linux 7.4 (wheezy) OS installed on Oracle VirtualBox and: java version "1.8.0_11" Java( ... anybody help me with this problem? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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135 views

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java - How to install Jdk in centos

I am new to centos and linux systems. I have downloaded both jdk-6u35-linux-x64.bin and .rpm.bin but ... bit machine with suitable download link See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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256 views

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java - Spring MVC and Servlets 3.0 - Do you still need web.xml?

In a typical Spring MVC web app, you would declare the DispatcherServlet in web.xml like so <!-- MVC ... Spring application without any xml? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to check if a session is invalid

How to check if a session is invalid or not? There is no method in the API. Is it the same as isNew()? And what is the difference if not? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - What is meant by parameterized type?

This link states the following: The instantiation of a generic type with actual type arguments is called a ... String> or LinkedList<String> See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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187 views

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java - How to configure Spring without persistence.xml?

I'm trying to set up spring xml configuration without having to create a futher persistence.xml. But I'm constantly ... What am I missing here? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Spring jUnit Testing properties file

I have a jUnit Test that has its own properties file(application-test.properties) and its spring config file(application- ... ...addtnl code } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Atomic Operations and multithreading

Recently I was reading a tutorial, in that I came across a statement that says.. "The Java language ... use AtomicInteger or AtomicLong classes. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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109 views

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java - How do I test Guice injections?

I gave to Google Guice the responsibility of wiring my objects. But, how can I test if the bindings are working well? ... that A.b isn't null. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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353 views

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java - Uploading file using Jersey over RESTfull service and The resource configuration is not modifiable?

@Path("file.upload") public class UploadFileService { @POST @Consumes(MediaType.MULTIPART_FORM_DATA) public Response ... Glassfish 4.0 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Android Animation: Wait until finished?

I would like to wait until an animation is finished* in an Android ImageView before continuing program execution, ... hope it helps someone. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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