java – Terminate a Stream when there is no incoming Data after a certain Timeout

EDIT: My original answer (below) operated at the readLine() level, but on second thoughts it can be nicer to operate on the Stream level. Here is an approach that operates on Streams. The core function is takeUntilTime(Stream<T> stream, Instant end), and the rest are small helpers. The idea is to traverse the original stream using … Read more

java – Why I can’t get medium level for math questions to appear?

import javax.swing.*; import java.awt.*; import java.awt.Color; import javax.swing.border.*; import java.awt.event.*; public class MATHfighter extends JFrame implements ActionListener { Border border = new LineBorder(Color.WHITE, 3, true); Border unborder = new LineBorder(Color.BLACK, 1, true); Container c = getContentPane(); JPanel gameText = new JPanel(); JPanel gameMenu = new JPanel(); JTextField answer = new JTextField(12); JTextField result = new … Read more

java – how to create JTables with POJOs with a composite key with a single table model

I’m trying to implement the use of reflection and annotations, just like the solution suggested by ardayigit on how to create a JTable with POJOs with a single table model, but the problem comes with the first field of Person, which is a two-field composite key of type PersonId. Here is the extract for creating … Read more

How to convert Json to Java object without knowing keys

This question already has answers here: Closed 4 min ago. My service can receive json with different keys. Such as: [ { “service”: { “compute”: “Compute” }, “serviceCategories”: [ { “serviceCategory”: { “awsCompute”: “AWS Compute” }, “schema”: “aws-compute”, “issueType”: { “instanceInaccessible”: “Unable to access instance”, “instanceUnlaunchable”: “Unable to launch instance”, “stuckMode”: “Stuck … Read more

java – Could not extract ResultSet SQL Spring Boot POST not working

Error in console I am getting the following 500 error on a POST not sure what is wrong, I have tried cleaning up the entity class Error {timestamp: 1654227336348, status: 500, error: “Internal Server Error”,…} error: “Internal Server Error” message: “could not extract ResultSet; SQL [n/a]; nested exception is org.hibernate.exception.SQLGrammarException: could not extract ResultSet” path: … Read more

Making Life Easy Around Data: Java, Jakarta EE

There is no doubt about the importance of data around the application. We often talk about a stateless application, and it is the data where we delegate the state of the application. If the architecture is the mind, the information is the heart. This article will cover more about the next steps of Jakarta EE … Read more

java – Apache POI upgrade to 5.0 error for Word document

We are upgrading Apache poi library from 3.17 to 5.0 version, when we update poi 5.2 dependency in POM.XML, getting the below mentioned error, while creating the document from template. Code to create document String relativeUrl = “/report-templates/DocTemplate.docx”; XWPFDocument wordDoc=new XWPFDocument(getClass().getClassLoader().getResourceAsStream(relativeUrl)); wordDoc.enforceUpdateFields(); Error Message “Handler dispatch failed; nested exception is java.lang.NoSuchMethodError: ‘org.apache.xmlbeans.XmlObject[] org.openxmlformats.schemas.wordprocessingml.x2006.main.impl.CTFootnotesImpl.getXmlObjectArray(javax.xml.namespace.QName, org.apache.xmlbeans.XmlObject[])'”, Dependency … Read more

Fast Microservices: When Microstream Meets Helidon

Microservices have become a buzzword when we talk about creating a scalable application. But is that enough? The simple answer is no. As with any software architecture decision, it has a trade-off and several challenges. Lucky for us Java developers, there is a combination of two tools to make our life easier: Microstream and MicroProfile. … Read more