Recent questions tagged java

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java - Intentionally setting a Spring bean to null

I'm using Spring to inject JMS connection factory into my Java application. Since this factory is only required within ... " way of doing this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to get position of key/value in LinkedHashMap using its key

Hi I have a LinkedHashMap (called info) that contains name/age (string/int) pairs. I want to find out, ... like info.getIndex("jeremy") See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Reading entire html file to String?

Are there better ways to read an entire html file to a single string variable than: String content = ""; try { ... } catch (IOException e) { } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Get name of a field

Is it possible in Java to get a name of field in string from the actual field? like: public class mod { @ItemID ... in Java, but who knows..) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to get max() element from List in Guava

Let's say we have a Collection of Items: class Item { public String title; public int price; } List<Item> list ... do that? How efficient is it? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - What is IllegalStateException?

I am trying to use the following Fastload API connection ... etc is perfect. I know exactly where it ... dataset somehow and throw an exception See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Catching an exception that is nested into another exception

I want to catch an exception, that is nested into another exception. I'm doing it currently this way: } ... do this more efficient and elegant? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to check if number is divisible by a certain number?

I am using AndEngine to add sprites to the screen and come across using the movemodifier method. I have two ... about every second. Any ideas? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Spring-Data JPA CrudRepository returns Iterable, is it OK to cast this to List?

I'm writing a code-gen tool to generate backend wiring code for Spring-boot applications using Spring-Data-Jpa and ... 's something I'm missing? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Spring prototype scope - Use Cases?

I have clear understanding of the various scopes of Spring beans. But I am looking for some use cases of prototype ... (not the request scope). See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Org.Hibernate.AnnotationException: No Identifier Specified For Entity I don't have a id in my table

I'm working with a table in a database and that table don't have a primary key or a proper column whith ... =false) private String anyfield; } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to mock remote REST API in unit test with Spring?

Assume I have made a simple client in my application that uses a remote web service that is exposing a ... are my alternatives using Spring? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Primary key from inserted row jdbc?

Is there a cross database platform way to get the primary key of the record you have just inserted? I noted ... SQL Server, MySQL and Oracle? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Understanding BufferedImage.getRGB output values

I'm getting an integer value for the pixel in an image using this method: int colour = img.getRGB(x, y); ... me the logic behind this value? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Java8 streams sequential and parallel execution produce different results?

Running the following stream example in Java8: System.out.println(Stream .of("a", "b", "c", "d", "e", ... java.runtime.version: 1.8.0_31-b13 See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Purpose of the "Build Automatically" option in eclipse

What is the purpose of Build Automatically option in Eclipse (Project-->Build Automatically)? Mine will always ... so. Please somebody explain. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Getting FileSystemNotFoundException from ZipFileSystemProvider when creating a path to a resource

I have a Maven project and inside a method I want to create a path for a directory in my resources folder. ... am I getting an exception now? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Format a number with leading sign

How do I format in Java a number with its leading sign? Negative numbers are correctly displayed with ... positive/negative currency values) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - What are the differences between Maven Jar Plugin and Maven Assembly Plugin?

Could somebody explain me the exactly differences between these two Maven plugins and when it is useful to work with one of these plugins? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - What is the right Maven dependency for javax.jms.* classes?

I need to import javax.jms.* classes. What is the right dependency to include into a Maven project? I'm trying ... :6.0 (from Maven Central). See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Maven:Failed to execute goal org.apache.maven.plugins:maven-resources-plugin:2.7:resources

I am building my project using Maven. My maven version is apache-maven-3.0.4. I am using Eclipse Luna. When I ... . But I still get this error. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - setting up a value for a variable name in thymeleaf

I am new to Thymeleaf and converting my Web page from JSP to Thymeleaf. I have a strut tag like this: ... alternatives for this in Thymeleaf? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to solve 'Program type already present: com.google.common.util.concurrent.ListenableFuture'?

I am trying to use WorkManager 1.0.0-alpha09. and getting this error: Program type already present ... context, WorkerParameters workerParams) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Get list of fields with annotation, by using reflection

I create my annotation public @interface MyAnnotation { } I put it on fields in my test object public class TestObject ... what i'm doing wrong? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - assertAll vs multiple assertions in JUnit5

Is there any reason to group multiple assertions: public void shouldTellIfPrime(){ Assertions.assertAll( () -> assertTrue( ... (isPrime(4)); } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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291 views

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java - Why does HttpServlet implement Serializable?

In my understanding of Servlet, the Servlet will be instantiated by the Container, its init() method will be ... replication will take place. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - maintaining TreeSet sort as object changes value

I've got a object that defines a 'natural sort order' using Comparable<>. These are being stored in TreeSets. ... the sort order are updated? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - HttpServletRequest - Get query string parameters, no form data

In HttpServletRequest, getParameterMap returns a Map of all query string parameters and post data parameters. Is there ... out the values. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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