Recent questions tagged JAVA

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java - How do I display a message if a jsf datatable is empty?

Using JSF1.2, if my datatable binding returns no rows I want to display a message saying so. How do I do ... completly if it's empty? 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 - Spring OAuth Authorization Server behind Spring Cloud Zuul Proxy

I am currently developing a application based on a micro service architecture. We use a API-Gateway implemented using ... does not explain why.) 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 - Tips for maintaining an internal Maven Repository?

I'm interested in maintaining a Maven 2 repository for my organization. What are the some of the pointers ... for a Maven Repository manager. 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 actually card table and writer barrier works?

I am reading some materials about garbage collection in Java in order to get to know more deeply what really ... to prepare some simulation. 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 is better: PooledConnectionFactory or CachingConnectionFactory?

We use Spring (3.2.4) with ActiveMQ (5.8.0) in Tomcat (7.0.41) and it is not clear what ... when we use PooledConnectionFactory? (related 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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java - What is the difference between the setConnectionTimeout , setSoTimeout and "http.connection-manager.timeout" in apache HttpClient API

What is the difference between the three(marked as comments) : MultiThreadedHttpConnectionManager connManag = new ... -manager.timeout" 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 - Google Protocol Buffers and HTTP

I'm refactoring legacy C++ system to SOA using gSoap. We have some performance issues (very big XMLs) ... interested in protocol buffers only. 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 - JSON Post request for boolean field sends false by default

Hi I am sending a JSON Post request using the FireFox RestClient. My JSON Request is as below: { "firstName": ... this.lastName = lastName; } } 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 standard for inclusive/exclusive ends of time intervals?

I'm wondering if there is a standard or "normal" means of interpreting time interval data end points with respect ... that work well in Java. 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 - role of multithreading in web application

I am using java(Servlets, JSPs) since 2 years for web application development. In those 2 years I never ... be appreciated. Thanks 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 - Bad Gateway 502 error with Apache mod_proxy and Tomcat

We're running a web app on Tomcat 6 and Apache mod_proxy 2.2.3. Seeing a lot of 502 errors like this: Bad ... any magical answers...yet. :) 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 difference between ResponseEntity<T> and @ResponseBody?

I have a simple handler in my controller which returns a message @RequestMapping(value = "/message") ... into account HttpStatus :) 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 - InputStream vs InputStreamReader

What's the benefit of using InputStream over InputStreamReader, or vice versa. Here is an example of InputStream in ... data aspect in Java. 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 - Required arguments with a Lombok @Builder

If I add @Builder to a class. The builder method is created. Person.builder().name("john").surname("Smith").build() ... ) { this.name = name; } 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 a method's annotation value from a ProceedingJoinPoint?

I have below annotation. MyAnnotation.java @Target(ElementType.METHOD) @Retention(RetentionPolicy.RUNTIME) public @interface ... class? 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 - What's the point of JAXB 2's ObjectFactory classes?

I'm new to using JAXB, and I used JAXB 2.1.3's xjc to generate a set of classes from my XML Schema. ... to re-compile from an altered schema. 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 customize ModelMapper

I want to use ModelMapper to convert entity to DTO and back. Mostly it works, but how do I customize it. It ... is better I'll accept 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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396 views

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java - Spring boot devtools - Static content reloading does not work in IntelliJ

When building my first Spring Boot app, I discovered that I need to restart my app every time I make a ... need to change my run configuration? 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 - Guice, JDBC and managing database connections

I'm looking to create a sample project while learning Guice which uses JDBC to read/write to a SQL database. ... return "select result"; } } 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 Toolbar with Fragments

I am trying to create a viewpager that swipes through 3 different fragments each with a different toolbar. I ... working with certain devices? 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 - Copy specific fields by using BeanUtils.copyProperties?

springframework.beans.BeanUtils is very useful to copy objects, and I use the "ignoreProperties" option frequently. However, ... = address; } } 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 - When are daemon threads useful?

I know that Deamon threads background threads. We can create our own daemon thread by calling setDaemon(true). ... our thread as daemon thread? See Question&Answers more detail:os...

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

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173 views

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java - Use cases for IdentityHashMap

Could anyone please tell what are the important use cases of IdentityHashMap? See Question&Answers more detail:os...

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

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364 views

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java - shutdown and awaitTermination which first call have any difference?

What is the difference between ExecutorService eService = Executors.newFixedThreadPool(2); eService.execute(new TestThread6() ... me an example. 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 use Guice's AssistedInject?

I've read https://github.com/google/guice/wiki/AssistedInject, but it doesn't say how to pass in the ... injector.getInstance() call look like? See Question&Answers more detail:os...

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

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287 views

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java - Thymeleaf: how to use conditionals to dynamically add/remove a CSS class

By using Thymeleaf as template engine, is it possible to add/remove dynamically a CSS class to/from a ... classes according to the situation. See Question&Answers more detail:os...

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

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183 views

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java - Defining an abstract class without any abstract methods

Can I define an abstract class without adding an abstract method? 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 an int is a null

I have an object called Person. it has several attributes in it; int id; String name; i set a person object like ... How can i do this check ? See Question&Answers more detail:os...

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

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