Recent questions tagged Java

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java - What is the ObjectFactory role during JAXB-Unmarshalling?

I'm using JAXB 2.2.2 to parse a simple XML-REST stream. This is the piece of code: JAXBContext jc = ... . Is there something wrong in 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 - javax.mail.AuthenticationFailedException: 535 5.7.3 Authentication unsuccessful

I am sending e email using an SMTP error . I am getting Authentication unsuccessful. The username and password ... .send(Transport.java:124) 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 - Localisation error 'is translated here but not in default locale'

I have created a values-fr and values-es and values. The contents of values is english, but for each string ... of the values/strings.xml lines 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 - Eclipse does not launch (Ubuntu) : JVM terminated. Exit code=13

I have a problem with Eclipse. When I try to launch it, I get this error message: JVM terminated. Exit code=13 / ... 't work. Can you help me? 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 - Regular Expression for Percentage of marks

I am trying to create a regex that matches percentage for marks For example if we consider few percentages ... such expression please share See Question&Answers more detail:os...

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

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555 views

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java - override log4j configuration programmatically: file location for FileAppender

is it possible to override the "File" property of an appender that has been configured in the log4j.properties ... Thanks a lot 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 - JAXB SchemaFactory source order must follow import order between schemas?

Using latest JAXB (Sun) and have a hierarchy of schemas that use import directives between schemas to share type ... . Any way around 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 - Calculate FFT from audio file

Before, I asked question about Get frequency wav audio using FFT and Complex class , There, I need to calculate ... be appreciated... :) 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 Modify a javax.json.JsonObject Object?

I am coding a feature in which I read and write back json. However I can read the json elements from a file ... .okr.App.main(App.java:28) 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 generic String to <T> parser

Is there a straight-forward way to implement a method with the following signature? At minimum, the ... implementation that uses reflection. See Question&Answers more detail:os...

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

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707 views

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java - Hive: AppClassLoader cannot be cast to URLClassLoader although using JDK8

After installing jdk9 I have been seeing this problem: $hive Java HotSpot(TM) 64-Bit Server ... with checksum 03c91029a6103bd91f25a6ff8a01fbcd 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 - File Excel From Apache POI Cant Open by Ms Excel (corrupt)

I don't know why the file I write using POI cant be opened by Ms Excel 2013, but the file is still readable ... close(); Thanks for your 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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java - Restricted generics with CDI

The JSR-299 specification states in §3.1: If the managed bean class is a generic type, it must have scope ... scope. Often, but not always. 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 - Frame always on top of my program only

I'm trying to create a kind of toolbar in an undecorated alwaysOnTop frame. Thus, I want my frame to be on ... the dialog gets the focus? 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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282 views

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java - Compatibility issues while converting Classes to Records

I have been working with the following class named City @ToString @AllArgsConstructor public class City { Integer id; ... to go around 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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598 views

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java - COALESCE in JPA namedQuery

I have the following namedQuery select new test.entity.Emp(COALESCE(k.projectId,'N') as projectId, k.projectName) ... handle null values in JPA? 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 - Prevent program from crashing when showing allocation stack traces

Question Why does VisualVM terminate my program when attempting to view object allocation stack trace, and how do ... it elsewhere. Sorry. See Question&Answers more detail:os...

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

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417 views

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java - Spring Boot - where to place the jsp files

I am trying to develop a new Spring boot application using MVC as a first step to move my existing Spring MVC ... / spring.mvc.view.suffix:.jsp See Question&Answers more detail:os...

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

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542 views

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java - How to specify JVM argument for Maven built executable JAR

When using Maven to build an executable JAR, how do I specify the JVM arguments that are used when the JAR ... according to this and this post. 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 encoding type of a XML file?

I am parsing XML using DocumentBuilder. XML has first line as this: xml version="1.0" encoding="GBK" I ... read encoding of the source fileF. See Question&Answers more detail:os...

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

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630 views

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java - JPA flush vs commit

in JPA, if we call EntityTransaction.commit(), does it automatically call EntityManager.flush()? or should we ... my english, 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 do I prevent Maven 2 from searching remote repositories for specific local depedencies?

How do I prevent Maven 2 from searching remote repositories for specific dependencies that are in the local repository only? See Question&Answers more detail:os...

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

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344 views

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java - Output range of Perlin noise

I'm investigating a few of the various implementations for coherent noise (I know there are libraries, but this is ... is a java.util.Random. 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 - Database connections not closed after idle-timeout in wildfly Datasource

I have an application running under wildfly 8.1 The database connections used in the applications are taken from a Datasource defined ... idle | 06:08:34.443118 | 06:08:34.435299...

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

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379 views

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java - JVM returns error 143

A Java application running as an scheduled task on Windows 2003 crashed with no logs or anything that would help ... to be terminated? 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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287 views

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java - Error symbol not shown in Navigator view

I use Eclipse for java development: Eclipse Java EE IDE for Web Developers. Version: Indigo Service Release 1 Build ... it a bug maybe? 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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378 views

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java - Reading time values from spreadsheet using poi api

I am trying to read a date column and a time column from a spreadsheet. I am able to retireve the date column ... 31/1899 as result for all rows See Question&Answers more detail:os...

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

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529 views

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java - Hibernate Delete Cascade

I Have one entity [Project] that contains a collection of other entities [Questions]. I have mapped the relation ... knows how to solve 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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