Recent questions tagged java

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java - Why is the default capacity of ArrayList 10?

I saw the java doc for ArrayList and found that the initial capacity of ArrayList is 10. /** * Constructs ... reason behind the number 10? 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 - No property found for type error when try to create custom repository with Spring Data JPA

I have a Media entity that has some basic fields for files uploaded by the user. For saving the bytes of the files ... how I can fix it? 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 - application context. What is this?

My colleagues very often use word "application context". In many articles this collocation used very often too. My ... to deal with this 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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java - ClassCastException: RestTemplate returning List<LinkedHashMap> instead of List<MymodelClass>

I'm trying to access getter methods on my MyModelClass but my code is returning List<LinkedHashMap> instead of List ... would help a lot. 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 get the list of available folders in a mail account using JavaMail

I am using JavaMail API to connect to my personal account. I have list of folders (labels) in my Gmail ... folders available in a mail account? See Question&Answers more detail:os...

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

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205 views

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java - Call a Fragment method from an Adapter

I have a method sendData() in my fragment. This method starts a new Activity. I want to call this method from my ... ; } How can I do 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 - Named blocks to limit variable scope: good idea?

For years, I've been using named blocks to limit the scope of temporary variables. I've never seen this ... some thoughtful responses. 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 - jstack: Target process not responding

I am running Ubuntu server edition and I wanted to take a thread dump of Tomcat. So, I first tried to ... tons of exceptions on the console. 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 long to byte array and add it to another array

I want to change a values in byte array to put a long timestamp value in in the MSBs. Can someone tell me ... by it.Please correct me if 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 - Deserializing JSON into object with overloaded methods using Jackson

I am attempting to deserialize a JSON object stored in CouchDb using Jackson. This object needs to deserialize into ... .valueOf(multiplier)); } See Question&Answers more detail:os...

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

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191 views

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java - JavaFX: Stage close handler

I want to save a file before closing my JavaFX application. This is how I'm setting up the handler in ... handler I've added to primaryStage? See Question&Answers more detail:os...

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

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168 views

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java - Bad form for JUnit test to throw exception?

I'm pretty new to JUnit, and I don't really know what best practices are for exceptions and exception ... yourself? 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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355 views

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java - How to check whether Kafka Server is running?

I want to ensure whether kafka server is running or not before starting production and consumption jobs. It is ... some starting data packets. See Question&Answers more detail:os...

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

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430 views

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java - The type List is not generic; it cannot be parameterized with arguments [HTTPClient]

import java.awt.List; import java.awt.image.BufferedImage; import java.io.BufferedReader; import java.io. ... (List) is undefined 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 - Getting UndeclaredThrowableException instead of my own exception

I have the following code public Object handlePermission(ProceedingJoinPoint joinPoint, RequirePermission permission) ... AccessException. See Question&Answers more detail:os...

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

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168 views

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java - How to chain multiple different InputStreams into one InputStream

I'm wondering if there is any ideomatic way to chain multiple InputStreams into one continual InputStream in Java ... example would be helpful. See Question&Answers more detail:os...

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

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260 views

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java - Can I add maven repositories in the command line?

I'm aware I can add maven repositories for fetching dependencies in ~/.m2/settings.xml. But is it possible to add a ... is a bit of a hassle. See Question&Answers more detail:os...

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

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487 views

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java - Ignoring of Checkstyle warnings with annotation @SuppressWarnings

I try to ignore or disable some useless warnings in eclipse by checkstyle with annotation @SuppressWarnings like How to ... is poor. Some 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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358 views

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java - Cannot get a text value from a numeric cell “Poi”

I'm trying to consume data from a spreadsheet in Excel, but always of this error, already tried formatting the ... ioe) { ioe.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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462 views

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java - Google OAUTH: The redirect URI in the request did not match a registered redirect URI

I am trying to make an upload to YouTube from my Java based web app, I spent a few days to understand ... youtubeAnalytics v1-rev35-1.17.0-rc See Question&Answers more detail:os...

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

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182 views

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java - Why are my Gradle builds dying with exit-code 137?

I've been trying to compile and test a large project to use Gradle. The test run fine until they die unexpectedly. ... } (build should be done). See Question&Answers more detail:os...

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

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179 views

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java - Why does JDK sourcecode take a `final` copy of `volatile` instances

I read the JDK's source code about ConcurrentHashMap. But the following code confused me: public boolean isEmpty() { ... ? Is there some reason? See Question&Answers more detail:os...

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

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727 views

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java - What is the LIMIT clause alternative in JPQL?

I'm working with PostgreSQL query implementing in JPQL. This is a sample native psql query which works fine, SELECT ... that in my above query? See Question&Answers more detail:os...

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

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172 views

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java - Merge lists with stream API

I have the following situation Map<Key, ListContainer> map; public class ListContainer { List<AClass> lst; } I ... using Java 8 stream API? See Question&Answers more detail:os...

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

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579 views

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java - enum.values() - is an order of returned enums deterministic

I have a enum SOME_ENUM: public enum SOME_ENUM { EN_ONE, EN_TWO, EN_THREE; } Will SOME_ENUM.values() always return ... in the next JDK releases? See Question&Answers more detail:os...

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

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307 views

1 answer

java - JpaRepository Not supported for DML operations [delete query]

I have written a query to delete some objects in my interface extending JPaRepository, but when I execute ... :116) at org.apache.catalina.connector.CoyoteAdapter.service(Coyote...

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

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156 views

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java - Extending simple ANTLR grammar to support input variables

I'm still on my quest for a really simple language and I know now that there are none. So I'm writing one myself ... map: (A+B)/2 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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285 views

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java - Complex queries with JPA Criteria builder

Can someone suggest me how to build up the following query using JPA Criteria builder API? SELECT id,status, ... classes or any other way. See Question&Answers more detail:os...

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

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