Recent questions tagged java

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java - Error: unmappable character for encoding UTF8 during maven compilation

I am compiling a package using maven and it says build failure with following compilation error: SpanishTest.java[31, ... what to do. Thanks 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 - Lombok how to customise getter for Boolean object field?

One of my POJOs has a Boolean object field to permit NULLS in the database (a requirement). Is it possible to ... it as isXXX()? Thanks, Paddy 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 - Advantages/Disadvantages to exploded WAR files

An answer to a question I read today suggested deploying an application as an exploded (unzipped) WAR. It got ... form rather than packaged up? 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 is "else" rarely used after "if x then return"?

This method: boolean containsSmiley(String s) { if (s == null) { return false; } else { return s.contains ... have only one return statement?) 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 - Is there a way to stop NetBeans scanning projects?

I don't have much memory on my PC and a pretty weak processor. Although netbeans is by far my ... prevent netbeans from scanning projects? 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 com.sun.proxy.$Proxy

I have seen that when errors occur deep in different frameworks (e.g frameworks implementing the EJB ... they JVM implementation specific? 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 - Execute Maven plugin goal on child modules, but not on parent

In a multi-module project, how can you specify that you want to execute a plugin goal in all the child- ... bound to the integration-test phase. 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 Data Binding pass arguments to onClick method

Is it possible to pass custom arguments to onClick method using the Data Binding Library? I have my layout xml ... from xml to click handler? 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 print the data in byte array as characters?

In my byte array I have the hash values of a message which consists of some negative values and also positive ... I get the negative value? 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 - Get empty string when null

I want to get string values of my fields (they can be type of long string or any object), if a field ... I look for something easy to implement 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 - Multiple GSON @SerializedName per field?

Is there any way in Gson to map multiple JSON fields to a single Java object member variable? Let's say I ... - never the other way around.) 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 - Truncate a list to a given number of elements

What method truncates a list--for example to the first 100 elements--discarding the others (without iterating through individual elements)? 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 - Is LinkedList really faster than ArrayList in the case of insertion in the middle of list?

- What is the difference between LinkedList and ArrayList? When is it preferable to use a LinkedList? I think every ... Or maybe I'm wrong? 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: Eclipse Maven install build jar with dependencies

I am using Eclipse Maven (m2e) inside Eclipse and I am running my project like this: My pom.xml looks ... everywhere.. Thank you in advance 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 - Which arguments stand for what in JVM memory options?

There a lot of JVM arguments that affect the JVM's memory usage like -Xms, -Xmx, -Xns, -XX:MaxPermSize... What ... them - let's create one 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 MVC 3: return a Spring-Data Page as JSON

I have a data access layer made with Spring-Data. I'm now creating a web application on top of it. This one ... page). Is this possible and how? 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 the best way to manage configuration data

I am working on a product suite which has 4 products. Right now, all of the configuration data is either ... the configuration data in database. 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 I should not reuse a jclass and/or jmethodID in JNI?

This is a question related to a previous post, but this post was solved and now I wanted to change the ... and jmethodID for each JNI function? 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 - Maven + AspectJ - all steps to configure it

I have a problem with applying aspects to my maven project. Probably I am missing something, so I' ... java.lang.NoClassDefFoundError: AspectE 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 - Gradle multiple jars from single source folder

As for now we have a project structure with single source folder named src, which contains source code for ... source code folder structure. 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 reference a bean of another xml file in spring

I have a Spring bean defined in an xml file. I want to reference it from another xml file. How can I go about it? 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 play Youtube video in ExoPlayer in Android?

I am trying to play youtube video in exoplayer but here is some confusion I don't know what is DASH url ... /www.youtube.com/watch?v=v1uyQZNg2vE 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 - GWT Custom Event Handler

Can someone give me an example of creating a custom set of an Event and a Handler. Say you have a Person ... outside of any browser-based event. 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 can I return a value from a JDialog box to the parent JFrame?

I have created a modal JDialog box with a custom drawing on it and a JButton. When I click the ... access my JFrame function setModalPiece? 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 Spring Boot Application class needs to have @Configuration annotation?

I am learning about the Spring Framework but I can't understand what exactly the @Configuration annotation means and ... please help. Thanks !! 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 - Concat VS Merge operator

I was checking the documentation of RXJava and I notice that concat and merge operators seems do the same. ... ://github.com/politrons/reactive 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 - Is .collect guaranteed to be ordered on parallel streams?

Given I have a list of Strings List<String> toProcess. The results have to be in the order the original ... .collect(Collectors.toList()); 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 values and keys from HashMap?

I'm writing a simple edit text in Java. When the user opens it, a file will be opened in JTabbedPane. I did ... the HashMap. How can I 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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