1,920,068 questions
0
votes
0
answers
9
views
How to Download a JSP Page as a DOC File in Spring MVC?
I want to provide an option to download this generated JSP page as a .doc file. How can I achieve this in Spring MVC?
<%@ page import="java.text.SimpleDateFormat, java.util.Date" %>
...
0
votes
0
answers
4
views
Why isn't my website working? I load the servlet, and it loads incorrectly in Eclipse
Basically, I have a simple servlet. Let me explain.
I have Eclipse 2025-03.
I have Tomcat 11.
The project is a web project, but it's updated with Maven.
I run the servlet and it opens this website: ...
- 1
0
votes
0
answers
6
views
How to create custom button class in android that wouldn not change visual?
Before that, I used the standard android buttons, but I needed to make a custom button and I wrote such a class.
public class MyButton extends androidx.appcompat.widget.AppCompatButton {
private ...
- 3
0
votes
0
answers
9
views
Apache Activemq classic scheduled send seems to be bugged with Spring Boot JMS
Unless I'm misreading the apache activeMQ docs, it appears that the use of AMQ_SCHEDULED_DELAY, AMQ_SCHEDULED_PERIOD, and AMQ_SCHEDULED_REPEAT is bugged when they are used together when sending ...
0
votes
0
answers
7
views
Why swagger @Encode annotation isn't applied to multiple parameters at Controller level?
I have a problem with OpenAPI curl generation.
I have to create POST method with three parameters: application/json, text/plain and multipart/form-data medium types. So curl that is going to be ...
- 1
0
votes
0
answers
6
views
Error: "Mapped superclass 'BaseClass' may not specify a @Table" when using only orm.xml mapping (no annotations in Java class) - Hibernate 5.x to 6.6
I am currently upgrading my project from Spring Boot 2.x to 3.x, and as part of this, I am also upgrading from Hibernate 5.x to 6.6. The issue I’m facing occurs with a mapped-superclass that’s only ...
0
votes
0
answers
10
views
Tracing per endpoint using springboot and micrometer
What I would like to achieve, details about my goal:
I would like to have tracing per business endpoint for a springboot web app using micrometer.
Background
I have a rest api which exposes two ...
- 5,110
0
votes
0
answers
4
views
Java : Redis Lettuce Mode : OR Conjunction Condition is not wrapping self and chained condition within parenthesis
Sample condition
import com.redis.lettucemod.search.SearchOptions;
import com.redis.lettucemod.search.SearchResults;
import com.redis.lettucemod.search.Limit;
import com.redis.lettucemod.search....
- 344
0
votes
0
answers
7
views
Spring Jersey API: 400 Bad Request when Importing Document to Outline API
I am working on a Spring Jersey application where I need to import a document into Outline using their API. However, when I send the POST request to /documents.import, I receive a 400 Bad Request ...
- 19
0
votes
1
answer
24
views
How to ensure an iterator with a read lock will unlock even if it doesn't finish?
I have a collection. Many threads should be able to read from it at a time, but only one thread should be able to write to it at a time, and only when it's not being read. Java's ...
- 111
0
votes
1
answer
28
views
How do I host a java file using Apache Tomcat in xampp?
I downloaded xampp and java. I compiled a java program, added it to the directory(C:\xampp\tomcat\webapps\ROOT\WEB-INF/StinkyApp.class), and opened localhost:8080 in my browser.
But I got an error ...
1
vote
1
answer
22
views
How to sort a column by data from another column in JTable
I need to sort the column with "File creation date", but if the column "File type" == FyleType.DIRECTORY this row should be at the top.
That is, first sorting should be by type, ...
- 21
7
votes
2
answers
90
views
Increased memory consumption due to String Constant Pool behavior after upgrading from Java 17 to Java 21
While upgrading our project from Java 17 to Java 21, we noticed an increase in memory consumption. After dumping the heap and analyzing the differences, I found that there are thousands of empty ...
- 93
0
votes
0
answers
21
views
While Executing Script To Execute a Query getting can't read "1207": no such variable
#!/bin/bash
# Set paths and variables
JAVAPATH=/usr/java/latest/bin/java
PRESTO_JAR_PATH=/data2/pqr/presto/trino
PRESTO_SERVER=https://a.b.c.d:9443
USER=pqrxyz
PASSWORD="pwdenb\$1207" # ...
0
votes
0
answers
17
views
Error initializing database using Quarkus
Here's the error stack trace:
Caused by: java.lang.IllegalStateException: No current Vertx context found
at io.quarkus.hibernate.reactive.panache.common.runtime.SessionOperations.vertxContext(...
- 1
0
votes
0
answers
18
views
Gradle composite build with convention plugins and platform
Is it possible to use Gradle Platform also for convention plugins? I have a project using gradle with the following structure
Projects:
------------------------------------------------------------
...
- 1
-1
votes
0
answers
18
views
The problem is that when new messages occur, the scrolling does not work properly/the size of text area do not update properly, i don't understand it
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
...
0
votes
0
answers
26
views
A Star Algorithm not finding single complete path
I have an implementation of Astar but it seems to plot an odd path to the target.
It appears to evaluate node correctly, but I'm not sure if it is working right because the path list at the end ...
-1
votes
0
answers
16
views
Status 200 with error in Whatsapp API, what to do? [closed]
I'm trying to use the WhatsApp Meta API through a code written in Java, with the simple purpose of sending messages to certain numbers, as a test. However, the code returns status 200, but the message ...
1
vote
1
answer
33
views
Why doesn't INET_NTOA work in ColumnTransformer?
I have a MySQL table that stores information about label printers:
ip
port
nickname
181012304
9100
PRLMA213
181012370
9100
PRLMA212
181012398
9100
PRLMA211
181012559
9100
PRLMA210
There is a ...
- 3,439
-1
votes
0
answers
28
views
How to send a post request Multipart/form-data (restTemplate) in Java returns insufficient data written
I'm trying to add an attachment (PDF) to a card to Leankit. The request worked before an update from the server. After searching I saw (when using Postman) there's:
----WebKitFormBoundary
in the ...
0
votes
0
answers
19
views
NoResourceFoundException in Spring Boot Oauth flow after spring boot 3 upgrade
I've recently upgraded spring boot from 2.x.x version to 3.3.3 and spring security v.6.4.3 and faced an issue when calling my /api/v1/authentication/login endpoint. When the user is authenticated with ...
- 53
0
votes
0
answers
15
views
How can i get the Yaw Pitch and Roll values from the Camera Pose of the ARCore?
I have this Java code using the ARCore Pose :
private void updateCameraPose(Pose pose) {
/float[] quaternion = new float[4];
/pose.getRotationQuaternion(quaternion, 0);
...
- 2,977
0
votes
0
answers
16
views
How to Manually Set Up a Spring MVC Project in IntelliJ or Eclipse Without GitHub Access?
I want to set up a Web Application project in IntelliJ IDEA using the following:
Spring Web MVC framework
JavaServer Pages Standard Tag Library (JSTL)
MySQL Connector Java (JDBC)
Apache Tomcat
...
- 1
0
votes
0
answers
26
views
Java Sping in container can't connect to external oracle database
I have a java spring boot inside docker a container which has to connect to an external Oracle database, i have set the db properties in the application.yml file.
The connection shouldn't require TLS/...
- 200
0
votes
0
answers
11
views
Tomcat10 Apache Commons Daemon - CreateJavaVM Failed
I'm trying to update a legacy application to Tomcat10/Java21 and ran into a block while debugging the windows service.
This service is installed using tomcat itself:
tomcat10.exe /IS/myservice --...
- 373
1
vote
1
answer
62
views
Jackson XML & JSON serialization of enum with value
I am using Jackson Marshaller for generating both XML and JSON from an object, but the JSON serialization of enum values always happens in capital letters.
I expected
{"handDrive": right}
...
- 75
0
votes
0
answers
27
views
Performance difference with springboot run and normal running the java class application.java
i am seeing significant performance difference when running my camunda spring boot project via just running application.java vs running through mvn:spring-boot:run
when running through application....
- 1,167
0
votes
1
answer
15
views
Lettuce: AWS Elasticache: JSON MGET behaviour
We are using Lettuce java client to connect to AWS Elasticache (Valkey engine, Serverless, version 8.0) from Java springboot application (JDK 17 & springboot version 3.2.5)
Below is the method ...
- 177
0
votes
0
answers
24
views
Error while migrating to Spring Boot 3.1.8 - UnsatisfiedDependencyException
We are encountering the following error while migrating our project to Spring Boot 3.1.8:
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name '...
- 113
-2
votes
1
answer
93
views
A way to use variable without reassigning inside if block
int min = nums[i + 1]; /<-- initial declaration
for (int j = i+2; j <nums.length ; j++) {
if (nums[j] < min) {
min = nums[j]; /<--reassigning
}
...
- 2,042
0
votes
0
answers
39
views
Potential race condition in Java 17's AbstractQueuedSynchronizer.cleanQueue() method [closed]
I've been analyzing the cleanQueue() method in Java 17's AbstractQueuedSynchronizer class and identified what appears to be a potential race condition that could break the queue structure under ...
- 49
-1
votes
1
answer
50
views
How can I end a Java process regularly [closed]
On Ubuntu I start a Java Application called Sterling Pdf with a .desktop file. Exec=sh -c "java -jar /home/claus/sterlingpdf/Stirling-PDF-with-login.jar & while ! nc -z localhost 8080; do ...
0
votes
0
answers
22
views
How to customize the "413 Payload Too Large" response in Quarkus with multipart/form-data requests?
How to customize the "413 Payload Too Large" response in Quarkus with multipart/form-data requests?
I'm working with a Java 21 Quarkus (3.18.1) API that uses the quarkus.http.limits.max-form-...
- 41
-1
votes
0
answers
31
views
spring boot 2.7.1 send request by restTemplate take a lot of time
I have a system consisting of several rest api projects.
Each rest api project is responsible for a specific topic in the project.
To my surprise, I discovered that accessing via rest api takes an ...
- 299
0
votes
0
answers
48
views
Create runnable jar with without repackaging dependencies
How to create a runnable jar (UberJar, FatJar) with Maven that
contains alls dependencies as origin jar files
can be executed by just calling 'java -jar myapp.jar' ?
TL;DR:
I am currently working on ...
- 460
-9
votes
0
answers
62
views
I try to open the npm start file on my Windows OS computer and nothing happens [closed]
The service requires determining and fixing an issue preventing a cryptocurrency website from starting up, particularly while executing the 'npm start' command on Windows. Additionally, the website ...
0
votes
0
answers
46
views
JUnit not recognized in VS Code anymore after reopening project (no green triangle icons)
I'm trying to run JUnit tests in Visual Studio Code without using Maven or Gradle, just using plain .java files and .jar libraries.
Project Setup:
I'm using VS Code with the Java Extension Pack, and ...
0
votes
1
answer
40
views
Cancel running task on separate when user clicks on cancel button
I have implemented an API /transferFile that downloads a file from a server and writes it to a specific location. To ensure the file transfer runs in the separate thread, I am using ExecutorService ...
- 31
0
votes
1
answer
59
views
Rebuild kafka Container after each change
I am trying to test Zookeeper to Kraft migration on my machine that later needs to done on dev env. I have created ZK and kafka images using podman and started them. Now one step in the migration is ...
- 39
0
votes
0
answers
25
views
While creating maverick-synergy-client, getting an error "Unable to locate a cryptographic provider"
I'm using kotlin 19 and JVM 21.
We recently moved to maverick-synergy-client 3.1.2 (upgraded from 3.0.11 where everything worked well).
This issue occurs without any additional dependencies.
Also ...
0
votes
1
answer
54
views
Hibernate generate wrong SQL query
I try to use criteria of Hibernate to get data from user search input but it didn't success. I got this error:
SEVERE: Invalid column name 'y1_'.
This is query that Hibernate create in log:
...
0
votes
2
answers
33
views
Any way to stub multiple methods to return the same thing
Is there a simpler/better way to write the following?
@Mock Dog dog; / Dog is a record
when(dog.tail()).thenReturn(Optional.empty);
when(dog.paw()).thenReturn(Optional.empty);
when(dog.nose())....
- 1,926
0
votes
0
answers
23
views
Db2 to Alloy-db conversion
I want to convert hundreds of DB2 queries to AlloyDB(postgresql) queries. Can I achieve this by writing an utility in java ? Can anyone help on how to achieve this using java?
0
votes
0
answers
14
views
How to implement conditions on choco-solver?
I'm reading this paper:
https://hal.science/hal-01092574/
They use CP programing to find diferential characteristic for AES cipher.
I am curious to know how we can implement this functionality using ...
- 23
0
votes
1
answer
46
views
Why does my custom ClassLoader implementation cause deadlock between threads?
I have a class loader LoaderX that inherits from URLClassLoader. This class loader implements the following methods:
override fun loadClass(name: String, resolve: Boolean): Class<*> {
try {
...
-1
votes
0
answers
23
views
GLSL ERROR: Linking vertex stage: Missing entry point: Each stage requires one entry point
I am working on debugging this error
ERROR: Linking vertex stage: Missing entry point: Each stage requires one entry point
Though I am not seeing in my code anywhere that I am missing an entry point. ...
1
vote
1
answer
28
views
How would I get a timer to continuously move the car after pressing the start button
How would I make it so that the car repaints continuously after pressing the start button and the start button doesn't have to be clicked multiple times for the car to move.
/ Initialize the timer ...
- 11
0
votes
0
answers
23
views
Set RTL in one Layout but not in others in the same app?
AppCompatDelegate.setApplicationLocales(LocaleListCompat.create(Locale.forLanguageTag(sLang))); is nice to set RTL layouts in apps, works fine.
But I have an Android app with a TabLayout with pagers ...
- 796
1
vote
1
answer
38
views
Proper way to handle JOINS with CrudRepository REST
I am new to developing REST using CrudRepository. I was wondering the proper way to handle JOINs?
I have three classes, three repo classes and three service classes.
Stress, Mood, User.
StressRepo, ...
- 3,074