Recent questions tagged JAVA

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java - Importing self-signed cert into Docker's JRE cacert is not recognized by the service

A Java Service is running inside the Docker container, which access the external HTTPS url and its self-sign ... with new certificate import? 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 - Group by month with criteria in Hibernate

I'm trying to get a report using Criteria and ProjectionList, and I'm pretty new using this through hibernate. So ... or tip I'll appreciate 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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java - -XX:OnOutOfMemoryError="kill -9 %p" Problem

I have an issue with trying to pass the -XX:OnOutOfMemoryError="kill -9 %p" command into my jvm args. I am using ... here or how I can fix 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 - ViewPager fragments disappear when change screen rotation

I'm working on android application that contains ViewPager with Fragments, like this: MainActivity(MainActivityFragment( ... see its content. 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 should I do hostname validation when using JSSE?

I'm writing a client in Java (needs to work both on the desktop JRE and on Android) for a proprietary ... /or needing less external code.) 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 make branchless code?

Related to this answer: https://stackoverflow.com/a/11227902/4714970 In the above answer, it's mentioned how you can ... by using >> and ~? 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 generate an HPROF file at will?

I have a java process which is acting dubiously. I'd like to see what's up using the various HPROF analysis ... I generate one on the fly? 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 are the advantages of @ControllerAdvice over @ExceptionHandler or HandlerExceptionResolver for handling exceptions?

Spring 3.2 introduced @ControllerAdvice annotation for handling exceptions in a Spring MVC application. But prior ... for handling exceptions? 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 show milliseconds in days:hours:min:seconds

This is what I have at the moment Seconds = (60 - timeInMilliSeconds / 1000 % 60); Minutes = (60 - (( ... days are coming out to be incorrect 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 native interface - How to access arrays within an object with JNI?

JNI tutorials, for instance this one, cover quite well how to access primitive fields within an object, as well as ... there a way to 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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418 views

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java - Jackson: Ignore Json configuration value

I have the following json file: { "segments": { "externalId": 123, "name": "Tomas Zulberti", "shouldInform": ... used to ignore a json field? 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 - Mono switchIfEmpty() is always called

I have two methods. Main method: @PostMapping("/login") public Mono<ResponseEntity<ApiResponseLogin>> loginUser(@RequestBody final ... ; } }); } 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 - Binary Semaphore vs a ReentrantLock

I've been trying to understand Reentrant locks and Semaphores ( the nesting of Reentrant locks vs release/unlock mechanism ... what I can get. 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 - HTTPS connection with client certificate in an android app

I am trying to replace the currently working HTTP connection with a HTTPS connection in a Android app that I am ... learn? Thanks for reading! See Question&Answers more detail:os...

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

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276 views

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java - Lock screen orientation when targeting Android API 27 with a non-opaque activity

I have an activity that has android:windowIsTranslucent set to true and android:windowBackground set to a translucent ... keep it like that. See Question&Answers more detail:os...

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

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225 views

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java - After upgrading to Java8, javac still shows 1.7

I'm having issues upgrading from JDK 1.7 -> 1.8 on OSX. The upgrade has completed, but javac still returns 1 ... get javac 1.8 to get installed? 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 - Liquibase or Flyway database migration alternative for Elasticsearch

I am pretty new to ES. I have been trying to search for a db migration tool for long and I could ... least upgrade scripts. 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 to configure Spring JavaMailSenderImpl for Gmail

I am trying to find the correct properties to use to connect to the Gmail SMTP sever using the JavaMailSenderImpl class ... </property> </bean> 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 - When should AccessController.doPrivileged() be used?

If I understand AccessController.doPrivileged correctly, it is saying that untrusted code ... .html#DP_CREATE_CLASSLOADER_INSIDE_DO_PRIVILEGED 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 - Convert an ArrayList to an object array

Is there a command in java for conversion of an ArrayList into a object array. I know how to do this copying ... [] array = MagicalCommand(a); See Question&Answers more detail:os...

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

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649 views

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java - Add my custom http header to Spring RestTemplate request / extend RestTemplate

My current code: RestTemplate restTemplate = new RestTemplate(); restTemplate.getMessageConverters().add(new ... by default. See Question&Answers more detail:os...

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

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316 views

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java - How to create an annotation that is a group of Jackson annotations?

A year or so I read an article that explained how I could create an annotation that basically is a ... serializer config into one annotation. See Question&Answers more detail:os...

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

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153 views

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java - RxJava - fetch every item on the list

I have a method that returns an Observable<ArrayList<Long>>, which are ids of some Items. I'd like to go ... I do this using RxJava operators? See Question&Answers more detail:os...

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

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889 views

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java - What is the recommended way to wait till the Completable future threads finish

I am using CompletableFuture as shown below in the code. But concerning the way I should wait till all ... know which one is recommended. See Question&Answers more detail:os...

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

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964 views

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java - ObjectMapper can't deserialize without default constructor after upgrade to Spring Boot 2

I have following DTOs: @Value public class PracticeResults { @NotNull Map<Long, Boolean> wordAnswers; } @Value public ... as the older version? See Question&Answers more detail:os...

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

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169 views

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java - Redirect pages in JSP?

I have to design several pages in jsp. After clicking on the submit button on the first page, the page ... demonstrates how to implement 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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1.1k views

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java - OpenCSV: How to create CSV file from POJO with custom column headers and custom column positions?

I have created a MappingsBean class where all the columns of the CSV file are specified. Next I parse ... position? Regards, Vikram Pathania See Question&Answers more detail:os...

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

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279 views

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java - How much memory do Enums take?

For example if I have an Enum with two cases, does it make take more memory than a boolean? Languages: Java, C++ See Question&Answers more detail:os...

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

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