Recent questions tagged JAVA

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java - How to tell when AudioTrack object has finished playing?

I'm trying to play a PCM file in Android using the AudioTrack class. I can get the file to play just ... stopped incrementing. Can anyone 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 - Bidirectional binding with ObjectBinding in JavaFX

I have a simple bean that has some properties related with each other. For example, this bean has a ... do the calculation inside setters? 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 - Creating an NDEF WiFi record using application/vnd.wfa.wsc in Android

As of Android 5.0.0 you can long tap on a WiFi connection and write that connection to a tag (" ... very unreliable and is incredibly tedious. 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 - Reading lines with BufferedReader and checking for end of file

If I have something like this in my code: String line = r.readLine(); //Where r is a bufferedReader How ... suggestions would be a great 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 - Why Hibernate inlines Integer parameter list passed to JPA Criteria Query?

I am building a query using JPA Criteria API. When I created two restriction predicates using javax.persistence. ... as String parameter 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 - error: unreported exception FileNotFoundException; must be caught or declared to be thrown

I'm trying to create a simple program that will output a string to a text file. Using code I found here, I ... point me in the right direction? 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 - Overriding return type in extended interface - Bad idea?

In Java, you can do the following : public interface IEngine{} public interface ICoolEngine extends IEngine{} public ... design faux pas here? 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 - Efficiently determine the parity of a permutation

I have an int[] array of length N containing the values 0, 1, 2, .... (N-1), i.e. it represents ... for temporary working space if 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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java - set Audio Attributes in SoundPool.Builder class for API 21

I am following an Android Programming video lecture series which was designed in the pre-API 21 times. ... SoundPool.builder and AudioManager. 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 - Can a lambda access members of its target functional interface?

I have created a simple interface using java8. In that it contains one method and one default method. interface ... using Lambda expression ?? 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 - keycloak CORS filter spring boot

I am using keycloak to secure my rest service. I am refering to the tutorial given here. I created the rest ... had HTTP status code 401. 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 reduce the Cyclomatic Complexity of this?

I have a method that receives an Object and does something based on what type of object it detects: void ... 't find anything too useful. 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 - In @Table(name = "tableName") - make "tableName" a variable in JPA

I am using JPA and I need to make the "tableName" a variable. In a database, I have many tables, and my code needs ... ...........} Any ideas? 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 - Can I avoid running junit tests twice in eclipse when using a TestSuite?

I need to do some per-suite initialisation (starting a web-server). It is working fine except that when I run all ... run as part of the suite. 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 point of heterogenous arrays?

I know that more-dynamic-than-Java languages, like Python and Ruby, often allow you to place objects of ... commonly defined between the two. See Question&Answers more detail:os...

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

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361 views

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java - local class incompatible Exception: when running spark standalone from IDE

I begin to test spark. I installed spark on my local machine and run a local cluster with a ... class serialVersionUID = -2221986757032131007 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 will not reset to beginning

InputStream data = realResponse.getEntity().getContent(); byte[] preview = new byte[100]; data.read(preview, 0, ... mistake..just not seeing 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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209 views

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java - How to get full message body in Gmail?

I want to get full message body. So I try: Message gmailMessage = service.users().messages().get("me", ... How to get full message body? See Question&Answers more detail:os...

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

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455 views

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java - How to resolve this JNI error when trying to run LWJGL "Hello World"?

I'm trying to run the sample "Hello World" from the LWJGL website From this link: LWJGL "Getting Started" I'm trying ... ) ... 7 more Any ideas? 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 - Dynamic construction of anonymous class confusion

I'm trying to make instances of anonymous classes using reflection. But ocassionally I've seen strange behaviour ... of such changes? 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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240 views

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java - Lucene index backup

What is the best practice to backup a lucene index without taking the index offline (hot backup)? See Question&Answers more detail:os...

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

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273 views

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java - Difference between Bounded Type parameter (T extends) and Upper Bound Wildcard (? extends)

I know that there was a similar question already posted, although I think mine is somewhat different... Suppose ... the two methods after all? 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 set UTF-8 character encoding in Spring boot?

I use spring-boot in my project, and I run this jar file which is built by spring-boot as a service on ... if you can give me any suggestion. See Question&Answers more detail:os...

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

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619 views

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java - Caused by: org.hibernate.MappingException: Repeated column in mapping for entity

I am beginner in handling JPA with maven and JBOSS, with Restful to make my application I have the following ... solve this problem. 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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390 views

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java - Spring Boot Whitelabel Error page (type=Not Found, status=404)

Good afternoon! I'm starting spring studies, I'm following a tutorial the same way, but it returns an error: ... where I'm wrong, please? See Question&Answers more detail:os...

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

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363 views

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java - Jackson deserialize JsonIdentityReference (alwaysAsId = true)

Following up on this question: Question here @JsonIdentityReference(alwaysAsId = true) and @JsonIdentityInfo(generator = ... like overkill. See Question&Answers more detail:os...

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

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289 views

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java - Kerberos - Cannot find key of appropriate type to decrypt AP REP - RC4 with HMAC

I'm trying to setup SSO for Java WebApp using Kerberos/SpNego. I'm using: Java 1.7u67 org.springframework. ... the generation of the keytab? See Question&Answers more detail:os...

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

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330 views

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java - Spring Autowiring only works with Interface

I am quite new to spring framework and came across the following issue. I have an interface ClassA, which is ... autowire a variable to ClassA2. See Question&Answers more detail:os...

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

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