Recent questions tagged java

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java - How can I make a WebMethod parameter required

We use the "start from Java" approach to creating JAX-WS 2.0 web services using the Metro 1.5 stack. When ... xsd and setting minOccurs to 1? 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 - JPA cascade persist and references to detached entities throws PersistentObjectException. Why?

I have an entity Foo that references an entity Bar: @Entity public class Foo { @OneToOne(cascade = {PERSIST, ... or am I missing something? 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 - Can't import javax.servlet.annotation.WebServlet

I have started to write app that can run on Google App Engine. But when I wanted to use my code from Netbeans ... How can I solve the problem? 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 correctly read Flux<DataBuffer> and convert it to a single inputStream

I'm using WebClient and custom BodyExtractorclass for my spring-boot application WebClient webLCient = WebClient.create() ... with flux/mono. 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 - Determine whether or not there exist two elements in Set S whose sum is exactly x - correct solution?

Taken from Introduction to Algorithms Describe a Θ(n lg n)-time algorithm that, given a set S of n integers ... Is sorting the array essential? 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 - Logback - set log file name programmatically

I am using logback, and I am trying to set the log file name programmatically within my Java program (similar ... log file from being created? 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 - Android ProGuard return Line Number

Is there a way to get ProGuard to return a line number where the crash happened? I can use retrace to get to ... down to a line number for me. 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 - Run Handler messages in a background thread

I want to run some Runnable in a background thread. I want to use Handler because it's convenient for delays. What I ... do it the "clean" way. 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 convert `content://media/external/images/media/Y` to `file:///storage/sdcard0/Pictures/X.jpg` in android?

I'm trying to upload image to Google Drive from my android app, based on this tutorial. When I debug their ... /storage/sdcard0/Pictures/X.jpg ? 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 Boot: how to use multiple yml files

In Spring Boot, I know that I can replace application.properties with application.yml and use the YAML format. ... class ApplicationConfig { ... 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 do I iterate over class members?

I am using the Java version of the Google App Engine. I would like to create a function that can receive ... I write the function getObject? 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 can I set my Cygwin PATH to find javac?

I have a Windows 7 system on which I have installed the latest Java compiler. I also have the latest Cygwin. ... not very familiar with cygwin. 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 safe is it to use -XX:-UseSplitVerifier?

There are known compatibility issues with JDK7 compiled code using instrumentation. As for http://www.oracle. ... ? Thanks, Piotr. 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 - JDBC ResultSet: I need a getDateTime, but there is only getDate and getTimeStamp

I would like to get the DATETIME column from an Oracle DB Table with JDBC. Here is my code: int ... looking for a getDateTime method. 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 an InputStream from a BufferedImage?

How can I get an InputStream from a BufferedImage object? I tried this but ImageIO.createImageInputStream() always ... a JPanel with success. 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 - Remove trailing comma from comma-separated string

I got String from the database which have multiple commas (,) . I want to remove the last comma but I ... I want: kushalhs, mayurvm, narendrabz 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 - In joda time how to convert time zone without changing time

I am getting UTC timestamp from database which is I am setting into a JodaTime DateTime instance DateTime dt = new ... 25 05:57:34 AM UTC 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 InputStream is Gzipped?

Is there any way to check if InputStream has been gzipped? Here's the code: public static InputStream decompressStream ... "); return content; } 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 test whether lazy loaded JPA collection is initialized?

I have a service that gets a JPA entity from outside code. In this service I would like to iterate ... some isInitialized() method somewhere? 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 - Could a final variable be reassigned in catch, even if assignment is last operation in try?

I am quite convinced that here final int i; try { i = calculateIndex(); } catch (Exception e) { i = 1 ... assigned to or not cannot be observed. 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 - Can not find a (Map) Key deserializer for type [simple type, class ...]

I have a domain object that has a Map: private Map<AutoHandlingSlotKey, LinkedHashSet<AutoFunction>> autoHandling; ... domain object to modify. 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 do I read a Maven dependency tree

I have servlet-api version 2.5 as provided scope in pom.xml. Here is part of the dependency:tree output of my ... depends on servlet-api 2.3. 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 - Extending Generic Classes

public class MyGeneric<T, E> {} public class Extend1<T, E> extends MyGeneric<T, E> {} public class Extend2 ... point, aioobe's answer is clearer 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 - Try catch in a JUnit test

I'm writing unit tests for an application that already exists for a long time. Some of the methods I need to ... , I would be really thankful. 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 do I create an executable fat jar with Gradle with implementation dependencies

I've got a simple project in Gradle 4.6 and would like to make an executable jar of it. I've ... would like to have implementation dependencies. 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 - JPA: How to get entity based on field value other than ID?

In JPA (Hibernate), when we automatically generate the ID field, it is assumed that the user has no knowledge ... problem as I understand). 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 - Clarifying terminology - What does "hydrating" a JPA or Hibernate entity mean when fetching the entity from the DB

In the context of ORM / Lazy loading of entities, my understanding of the term "Hydration" is as follows: " ... be using for this process? 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 - 'Optional.get()' without 'isPresent()' check

I have the following search code in Java: return getTableViewController().getMe().getColumns().stream() . ... findFirst() returns Optional. See Question&Answers more detail:os...

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

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