Recent questions tagged JAVA

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java - Converting Milliseconds to Minutes and Seconds?

I have looked through previous questions, but none had the answer I was looking for. How do I convert ... readable and less error-prone. 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 - Assert regex matches in JUnit

Ruby's Test::Unit has a nice assert_matches method that can be used in unit tests to assert that a ... true, actual.matches(expectedRegex)); 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 - mock instance is null after @Mock annotation

I try to run this test: @Mock IRoutingObjHttpClient routingClientMock; @Mock IRoutingResponseRepository ... missing? 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 - @Column(s) not allowed on a @ManyToOne property

I have a JPA entity with a property set as @ManyToOne @Column(name="LicenseeFK") private Licensee licensee; But ... the foreign key column? 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 - ActionBar in PreferenceActivity

In my application I am using the new Action Bar Compatibility sample from Google (located at <sdk>/samples/android ... Java than a layout thing. 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 - Best way to handle Hibernate Sessions in a layered Spring MVC Web application

If we have a web application which has heavy UI (Spring MVC + JQuery with JSON) Hibernate with JPA annotations ... . Thanks for your 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 - Spaced repetition algorithm from SuperMemo (SM-2)

In order to make a vocabulary practice app in Android, I want to implement the SuperMemo (SM-2) algorithm in ... people doing the same thing.) 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 - Glassfish 3.1 default principal to role mapping

I am working with glassfish and jaas module. I configured my web.xml in this way. <security-constraint> <web- ... it ? Thanks a lot Loic 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 - Set Repeat days of week alarm in android

Can somebody give good logic for set repeat days of week alarm? I have done weekly Alarm by using alarmCalendar. ... me out with this? 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 - Reasons for not directly writing Servlets for creating a REST API

In my current company we are starting a new project that will be a REST API in Java, deployed in a servlet ... RESTfull at all. Any other? 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 to node.js communication

I saw there are a couple of similar threads but i could not find my answer. I'm making and android app, an ... use) { use.printStackTrace(); } 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 Layered architecture of spring and still follow object oriented structure?

I learned spring and its layered structure(controller,service and dao) @Controller("userController") @service(" ... clarifies my doubt. 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 know if a detached JPA entity has already been persisted or not?

I have a JPA entity instance in the web UI layer of my application. I'd like to know at anytime if this ... would prefer stick to the standard. 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 - failed to lazily initialize a collection of role

Hi I have two classes like this: public class Indicator implements Serializable { ... @OneToMany(mappedBy = " ... m very new to Hibernate 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 - A clear explanation of system exception vs application exception

The JPA spec differentiates between system exceptions and application exceptions. I am a bit confused about where the ... it being used 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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277 views

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java - How is the internal implementation of LinkedHashMap different from HashMap implementation?

I read that HashMap has the following implementation: main array ↓ [Entry] → Entry → Entry ← linked-list ... the next and previous element? See Question&Answers more detail:os...

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

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423 views

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java - How do I create an embedded WebSocket server Jetty 9?

I hate asking such a vague question, but I'm having a hard time finding a simple example. Here's ... can handle WebSocket connection requests? 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 a PKCS12 keystore and a PKCS11 keystore?

I'm interested in Java-NSS libraries, and I'm reading the Sun's P11 Guide. I am confused on the ... be used interchangeably in any aspect? 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 - Controller's life-cycle in Spring MVC

What is the lifecycle of a Controller in Spring MVC? When is the controller created, when destroyed? Is it shared ... by more than one request. 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 - Eclipse JRE System Library [J2SE-1.5]

I'm using Eclipse EE 3.7 with m2e plugin installed. I have JDK7 set in eclipse. When I import maven projects, the ... help, how can i do this? 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 properly catch RuntimeExceptions from Executors?

Say that I have the following code: ExecutorService executor = Executors.newSingleThreadExecutor(); executor.execute( ... a clean solution? 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 fix Invalid AES key length?

I am working on a text encryption and decryption project (following Struts 2) Whenever I enter the password and ... .execute(SymEncrypt.java:24) 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 - kafka get partition count for a topic

How can I get number of partitions for any kafka topic from the code. I have researched many links but none ... a working solution to this. See Question&Answers more detail:os...

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

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174 views

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java - What is the difference between a session and a transaction in JPA 2.0?

I just begin my JPA 2.0 studies, and I have this piece of code: em = SessionFactory.startSession(); tx ... differences between them ? 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 - How to deal with (maybe) null values in a PreparedStatement?

The statement is SELECT * FROM tableA WHERE x = ? and the parameter is inserted via java.sql.PreparedStatement ' ... a better solution? 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 - Why is shared mutability bad?

I was watching a presentation on Java, and at one point, the lecturer said: "Mutability is OK, sharing is ... they both achieve the same goal. 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 require a generic parameter to be an enum that implements an interface?

I'm not 100% convinced that this is a good idea, but I bumped into some code today that's currently ... an enumeration. 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 - How I can use callback in Kotlin?

I have View and one CircleShape , which should show toast in this View. And I use it in main ... use Callback, onClickListenere in Kotlin? See Question&Answers more detail:os...

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

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