Recent questions tagged Java

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java - Why make defensive copies in getters inside immutable classes?

This question is about good programming practices and avoiding potential holes. I read Joshua Bloch's Effective Java ... (not security) ? 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 configuration with Spring Boot & multi modules - run application in Intellij

I'm currently working on a REST API with Spring Boot. I'm new to Maven and have just started coding with IDEA ( ... wrong in my config ! Thx ! 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 Optimistic Locking:How to retry transactional method till commit is successful

I use Spring 2.5 and Hibernate JPA implementation with Java and "container" managed Transactions. I ... StaleObjectStateException gets thrown. 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 - intellij feature (...) not supported at this language level. I can't compile

IntelliJ is showing me this error I just built my new computer and none of my java stuff is working... My ... except none of those have worked. 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 - PKCS#12 : DerInputStream.getLength() exception

I generate a certificate using the keytool command: keytool -genkeypair -alias myRSAKey -keyalg RSA -keysize 1024 ... exception. What is 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 - Why ThreadGroup is being criticised?

I'm aware of current practice of using Executors instead of ThreadGroup: generally preferred way to deal with ... to answer this question. 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 - Stop further processing when redirecting in a filter

I have URLRewirteFilter which checks if requested domain starts with www. and redirects to no-www url. How can ... (request, response); } 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 handle exceptions thrown by observer's onNext in RxJava?

Consider the following example: Observable.range(1, 10).subscribe(i -> { System.out.println(i); if (i == 5) ... can I do to solve 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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java - iterating a linked list

if I use a for-each loop on a linked list in java, is it guaranteed that I will iterate on the elements in ... in which they appear in the list? 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 - JAXB required=true doesn't seem to require

We have this JAXB annotation: @XmlElement(name = "Strategy", required = true) protected List<Strategy> strategy; If ... 't we get an exception? See Question&Answers more detail:os...

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

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257 views

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java - Abstract class as functional interface

In java 8, an abstract class with only one abstract method is not a functional interface (JSR 335). ... designers imposed this restriction ? 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 Entity Manager issue in Spring when using more than one datasource

I have two entity managers in my applicationContext.xml which corresponds to two different databases. I can easily query ... ;, DRIVER=4.7.85 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 find duplicates in an ArrayList<Object>?

This is a pretty common question, but I could not find this part: Say I have this array list: List< ... in OpenJDK but couldn't understand. 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 - Adding a round frame circle on rounded bitmap

Im trying to create a round frame around my bitmap! With this code im able to make my bitmap round: public static ... 't see any line or circle! 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 - Stream JSON output in Spring MVC

My application is built using Spring Boot(1.3.3.RELEASE) with Spring MVC, Spring data JPA Hibernate. MySql is ... and not the stream object? See Question&Answers more detail:os...

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

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269 views

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java - Find the most common String in ArrayList()

Is there a way to find the most common String in an ArrayList? ArrayList<String> list = new ArrayList<>(); list.add ... ","test","hello","test"] See Question&Answers more detail:os...

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

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424 views

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java - Propagate HTTP header (JWT Token) over services using spring rest template

I have a microservice architecture, both of them securized by spring security an JWT tokens. So, when I call my ... again to the other service? 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 - Hibernate configuration on runtime

I have hibernate.cfg.xml file. <session-factory>  <property name="connection ... must set them on runtime. See Question&Answers more detail:os...

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

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180 views

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java - Google App Engine: Memcache or Static variable?

Well, I think I have a very basic doubt here: I'm developing an app on GAE (Java) and performing a query to ... of pages. Thanks for the help! 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 - Count number of rows in an RDD

I'm using spark with java, and i hava an RDD of 5 millions rows. Is there a sollution that allows me to calculate ... *100/all+"%"); Thank you. See Question&Answers more detail:os...

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

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108 views

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java - How to call RESTFUL services from GWT?

I'm using GWT as web development framework. I need to access some REST services from my GWT client code. ... this problem? 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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392 views

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java - Android DownloadManager get filename

In my app you can download some files. I used the Android DownloadManager class for downloading. After the download ... ? Thank you very much. See Question&Answers more detail:os...

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

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703 views

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java - Spring @RequestBody and Enum value

I Have this enum public enum Reos { VALUE1("A"),VALUE2("B"); private String text; Reos(String text){this. ... Reos.valueof(). Is this possible? See Question&Answers more detail:os...

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

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164 views

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java - Unit testing jersey Restful Services

I'm new to unit testing and I want to test some jersey services in a project. We are using Junit. Please ... . Help would be 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 - What does "contract" of a class mean

I am reading the book The Java Programming Language. In the chapter which explains overriding method, it says: Making ... mean for a Java class? 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 - String.split() at a meta character +

I'm making a simple program that will deal with equations from a String input of the equation When I run it, ... ); System.out.println(rightt); See Question&Answers more detail:os...

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

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202 views

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java - Do I have to worry about InterruptedExceptions if I don't interrupt anything myself?

I'm using java.util.concurrent.Semaphore in a hobby project. It's used in a connection pool class I'm writing. ... ? How should I handle 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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121 views

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java - Why Spring Boot 2.0 application does not run schema.sql?

While I was using Spring Boot 1.5, on application startup Hibernate executed schema.sql file located in /resources ... is this an bug/issue? See Question&Answers more detail:os...

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

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