Questions tagged [java]
Java is a high-level object-oriented programming language. Use this tag when you're having problems using or understanding the language itself. This tag is frequently used alongside other tags for libraries and/or frameworks used by Java developers.
1,919,245
questions
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XML serialisation for utf characters contains ncr for surrogate pair
I have a payload that may contain some text like 𠮷. When I serialize this payload to xml, I expect such characters to be not encoded to ncr or encoded as 𠮷 a single character but I ...
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0
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5
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Hibernate: Generate non-id value from sequence
I have an entity with 2 fields which both use the same sequence, but when debugging I see that only the id field value is being generated:
@Table(name = "MY_TABLE")
public class MyEntity {
...
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0
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4
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Why is the wallet address generated by ton4j library using 24 words different from the real address of the wallet created using ton blockchain apps?
public class App {
public static void main(String[] args) {
try {
Pair key = Mnemonic.toKeyPair(Arrays.asList("artwork", "people", "where", "dolphin"...
-1
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0
answers
9
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jar file is not generated in my spring project
My name is Alex. I am learning spring and I have already completed a project. Now I want to upload it to the internet and publish it in my portfolio. However, when I give the following command in cmd: ...
-2
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0
answers
6
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Trying to get my war file to deploy to tomcat 9 server
I am building a full stack IT Ticketing System and it is still in its infancy (this is just a side project for fun). I can get everything to work locally by running the backend through IntelliJ but ...
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0
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5
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Android Studio get messages from server when app is closed
I am facing an issue when getting data from a server when the app is closed. I have an app for simple chatting, which gets and posts messages over http protocol to a server. I am not able to find a ...
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0
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7
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Spring RestClient seems to ignore configuration
I am trying to utilize spring RestClient to send simple post request with object seriaslized to JSON in request body. I need the objects to be serialised excluding null valued fields, so I thought ...
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0
answers
8
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SDKMAN can not install java because headers.tmp file is missing
I need to use multiple versions of java in my ubuntu 22. Just install SDKMAN with the command
curl -s "https://get.sdkman.io" | bash
but can not install java. When prompting command sdk ...
-2
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0
answers
12
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My application frontend does not open when I use intellij only when I use eclipse
I have a legacy application that was migrated to SpringBoot and when I run it through Eclipse without configuring anything different it runs and when I access my http://localhost:8080 it opens ...
1
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0
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9
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Jersey ServletContainer still trying to use javax
I am trying to update an application to run on Tomcat 10.1.26 supporting Jakarta EE 10 with jakarta.* package naming.
When deploying in Tomcat I get this error over javax.* package naming.
org.apache....
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8
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How to securely send files from server and store them to client's PC without client's interaction, with scheduling
I know that some iteration of this question was asked already, but I think my case is a bit more specific. I have a product that customers use to retrieve files from my server, periodically by ...
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9
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SpringBootTest uses application.properties from src/main
I am trying to run spring-boot test:
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
@ActiveProfiles("test")
public class UserServiceIt{}
THIS test doesnt need/...
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0
answers
5
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How to use Flink Kafka datasource as InputStream
I need to run something on Flink that does the following:
Take a bunch of audio data from Kafka and stream them to AWS transcription service.
Sounds easy, my problem is that the ...
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0
answers
15
views
Spring Boot loading classes from nested jars inside main executable JAR
I have a requirement to compile classes during Spring Boot application runtime. To do that I am using ToolProvider.getSystemJavaCompiler() and following approach:
try (StandardJavaFileManager ...
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0
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27
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How can I enhance the development of JAVAFX applications using MVC? [closed]
I have been working with JAVA and JAVAFX for some time now. I have come to discern certain limitations in utilizing FXML when tasked with creating dynamic and complex applications.
My personal ...
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12
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How can I determine if a Java/Kotiln/JVM (AWT / Compose multiplatform) application is running within a window manager on linux?
I am creating a desktop application using Compose multiplatform.
More specifically, using the JetBrainsRuntime
via the glue provided by jewel.
I am looking for a way to determine if my application is ...
0
votes
1
answer
12
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Not provider of jakarta.mail.util.StreamProvider was found (not Spring Boot!)
I'm trying to migrate a JavaX.mail class to use Jakarta mail, as it's required to move from Tomcat 9 to 10. I'm receiving a message java.lang.IllegalStateException: Not provider of jakarta.mail.util....
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0
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15
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KafkaConsumer is not able to process 2 million records
I am facing issue while fetching 2 million records from kafka topic through a consumer.
My requirement is to fetch the record and store those records into a Map and return that Map to other methods so ...
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0
answers
9
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MultiPart Request Spring
How can I make a breakpoint in my api to receive a request with json + file using Spring?
I've already tried using RequestParam, RequestBody and RequestPart, but none of it worked. It works to receive ...
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0
answers
11
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Show pdf file uploaded by user in Primefaces | Spring Boot
I have a widget to upload a file, and I want to preview the file after upload. I am using p:media tag but it is not showing the uploaded pdf file.
However, I have another widget where there is an ...
-1
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0
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8
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GRPC python cannot modify trailing metadata of python rpc status when aborting request (StatusRuntimeException)
Tried some hours to transfer trailing metadata inside StatusRuntimeException from a python service. This is like the current code sample which apparently doesn't work since the trailing_metadata is ...
-1
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0
answers
11
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Spring Boot JSON Merge Patch map properties to custom type field
In our codebase, we have a class called OptionalOrUndefined
public class OptionalOrUndefined<T> {
@Getter private final boolean defined;
private final T value;
public static <T> ...
0
votes
1
answer
30
views
Proper way to shut down a Spring Boot application after a specific unit of work is completed
I have a number of Spring Boot services that are always running that perform several different kinds of tasks. For example I have one service that is reading from an Azure Service Bus queue using ...
-1
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0
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7
views
ObservationHandler<ServerRequestObservationContext> does not expose context values to DefaultServerRequestObservationConvention
I am trying to use and extend spring boot's Observation API solution for instrumenting metrics for spring mvc http.server.requests.
I'm trying to add a custom tag, with the key duration, and a value ...
0
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0
answers
17
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OpenAPI Swagger Documentation Jargons
I have configured OpenAPI documentation in my spring boot application. Everything is coming that is expected but there are a lot of jargons coming up. Only the highlighted and ticked values are ...
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0
answers
9
views
Getting AccessDenied while accessing getAllSites() method in MS Graph using Java
Getting AccessDenied error while accessing getAllSites() method in MS Graph using Java. I have taken this block of code from Microsoft Learn. When I tried to execute this code, I'm receiving Access ...
-3
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0
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39
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Exception in thread "main" java.time.format.DateTimeParseException: Text '04-Sep-2023' could not be parsed at index 3 [duplicate]
below is the datetimeformatter
DateTimeFormatter dtf2 = new DateTimeFormatterBuilder().parseCaseInsensitive()
.append(DateTimeFormatter.ofPattern("dd-MMM-yyyy")).toFormatter()...
-1
votes
1
answer
40
views
Stream anyMatch accept an method reference not implement Predicate [duplicate]
Stream.anyMatch is defined as:
boolean anyMatch(Predicate<? super T> predicate)
I created a new Class as follows:
class ClassA {
public boolean anyMethodName(Object o) {
return ...
-1
votes
0
answers
15
views
Trouble streaming non-local Google Photos video without downloading
I'm making an app where the user can select a video from the gallery and launch it later using their default viewer.
My initial attempt looked like this
Intent intent = new Intent();
intent.setType(&...
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0
answers
7
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Java API only partially available with Frida aarch64
I tried to attach with Frida to Java process run on aarch64 Linux (not Android)
I got that error:
using frida-server-16.4.3-linux-arm64
[Remote::PID::1234 ]-> Java.enumerateLoadedClasses();
Error: ...
-3
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0
answers
52
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Why Can't Characters Be Converted to Operators at Runtime?(java) [closed]
While learning Java, I wondered if there was a way to take an operator as a character input and use it directly in calculations. I realized that without using if or switch statements, there is no way ...
0
votes
1
answer
46
views
How do you assess code for problems handling leap seconds (particularly Java)? [duplicate]
We recently got notice that there may be a negative leap second at the end of the year and we need to determine how it will affect our programs (we write mostly java programs). I've done some ...
0
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0
answers
18
views
cannot access class com.sun.tools.javac.api.JavacTrees (in module jdk.compiler)
I have customized an annotation handler using java21. The pom file of the project where the annotation processor is located is shown below:
<project xmlns="http://maven.apache.org/POM/4.0.0&...
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0
answers
11
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Android - BillingLogger: Skipped logging since initialization failed
Testing out in app purchases with the following:
purchasesUpdatedListener = new PurchasesUpdatedListener() {
@Override
public void onPurchasesUpdated(BillingResult billingResult, List<...
0
votes
0
answers
36
views
Why is a clean Maven project in Netbeans not running
I am setting up a local instance to run a Java webapp. It's been a while since I've done this but I've done it in the past. So far what I've done is installed JDK 22.0.2 and Netbeans 22 on my local ...
0
votes
1
answer
15
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Hide page count from the go to section of the pdf toolbar when pdf is opened in browser
From java side I am converting tiff images to PDF like below.
Rectangle pagesize = new Rectangle(maxWidth, maxHeight);
Document document = new Document(pagesize);
PdfWriter.getInstance(document, ...
-1
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0
answers
13
views
Springboot quickstart project always gives same error no matter what I do; Could not determine the dependencies of task ':bootRun' [duplicate]
error in question:
FAILURE: Build failed with an exception.
* What went wrong:
Could not determine the dependencies of task ':bootRun'.
> Could not resolve all dependencies for configuration ':...
0
votes
0
answers
14
views
OkHttp Response doesn't have provided body object on the client side
I am writing REST APIs using okhttp library in Spring Boot. I have my OkHttpClient requesting a GET request(client) from another API(server). Both the client and server uses OkHtttp libraries, so I ...
-1
votes
0
answers
9
views
WebClient static mock is not working the second time is called in a test
I have the next static mock:
try (MockedStatic<WebClient> webClientStatic = Mockito.mockStatic(WebClient.class)) {
webClientStatic.when(WebClient::builder).thenReturn(...
-1
votes
1
answer
18
views
Upload an Excel sheet with huge number of records to a MySql database in the form of a JSON
I have a requirement in Spring Boot project, where I have a huge Excel file with 15-20 sheets, each sheet containing 30,000 rows with an average of 15 columns in each sheet.
My Database is roughly as ...
0
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0
answers
6
views
Flink GlobalWindow Trigger only process the trigger event
I have datastream keyby by an event property, that is then passed to a globalwindow, trigged when a specific event comes in, the issue is that when the window is trigged to process the events, it only ...
-1
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1
answer
35
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Spring RestTemplate - How to remove `client_secret` from the logs?
My backend application currently leaks client_secret inside my log file. I would like to keep the log level of DEBUG except for the RestTemplate where I don't want this line to be executed.
The log ...
-2
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0
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19
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Using a Bean method result in a static context [closed]
I've got a class:
public class SomeBean {
public String getSomeValue() {
return "result";
}
}
I am using this class as a bean:
@Configuration
public class ...
-13
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0
answers
67
views
EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x00007ff8ed191184, pid=51412, tid=0x0000000000009a34 [closed]
I am writing protection for the maincraft cheat in the form of a native and when I added lazy importer I started having such errors
# A fatal error has been detected by the Java Runtime Environment:
#
...
-1
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0
answers
19
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How to Automate Adding Global Libraries in IntelliJ Idea
I'm working on client's Java 8 application in IntelliJ IDEA that requires adding / re-adding two JAR files as Global Libraries to every component in the project after every code change. (Yes, this is ...
-1
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0
answers
17
views
How to display image from USB camera on old android?
Short question: I'm making an app for android 4.2.2, to display image from USB camera on tablet. The picture is not displayed. Can you please explain why? Thanks!
(below is a link to the source code)
...
-2
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0
answers
12
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Can't download files content-disposition inline with a POST request from my app after activating CORS on a spring boot 3 application on Chrome/Edge
I'm currently working on a java spring boot (3.2) application with Spring MVC and secured with Spring security.
I wanted to add a CORS configuration on my app but this add a bug on downloading files ...
-1
votes
0
answers
32
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Memory issues after upgrade to Spring boot 3, Java 17 [closed]
We recently upgraded our application from Spring boot 2.2, Java 11 to Spring boot 3.2 Java 17. After the upgrade we observed that the memory progressively increases and then goes down to zero and it ...
1
vote
1
answer
16
views
ArUco marker cannot be detected by OpenCV ArUco library in JAVA
I was working on a project where I have to detect ArUco markers in the images captured by the webcam. I was following the documentation until I found out that Java implementation of OpenCV ArUco ...
0
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0
answers
18
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PanacheEntity record update works only once
I am learning qurkus and I have a problem that I can't update a record in the db more than once.
I use merge() to update my records:
@WithTransaction
public Uni<User> update(User user) {
...