Recent questions tagged Java

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java - PDFBox Form fill - saveIncremental does not work

I have a pdf file with some form field that I want to fill from java. Right now I'm trying to fill just ... pdf file with which I working: pdf 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 create a class that "extends" two existing concrete classes

I very well know that it can be done with the help of interfaces and i have done it many times. But this time ... about why it's not allowed.) 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 restart tomcat from a running webapp?

I need to restart tomcat service from a webapp running on this tomcat. So I'm trying to execute script that ... . thank you for your time 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 create database in Hibernate at runtime?

I'm using Hibernate tenancy and every time user logs I'm changing database to his username (SQLite). Sadly ... .hbm2ddl.auto">update</property> 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 - why static block in child class does not get executed?

here is the code public class ClassResolution { static class Parent { public static String name; static { System. ... . Thank you, everyone. 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 - Javabean convention - method naming for property gId

If I have a property 'gId' in my Java class what should the accessor method be named as? getGId is what I ... am right in what I am saying? 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 take values of only selected checkbox in Action class in Struts 2 and JSP

I am displaying 24 checkboxes. I want to get all the values of checked checkboxes in action class and insert it as a new record ... ">Commission</span> </div> </div> <div class="c...

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

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java - JavaFX ComboBox Image

I am trying to create a ComboBox that will display a preview of selected Image, but the ComboBox displays the string ... e.g. file:Java1.png). 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 a RSAPrivateCrtKey from a RSAPrivateKey?

I have a java.security.interfaces.RSAPrivateKey and the corresponding java.security.interfaces.RSAPublicKey containing ... already). 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 - JDBC garbage collection

What happens if i don't close resultset or preparedstatements. Will they be closed and released by the ... any documentation about 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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581 views

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java - Hibernate-validator Groups with Spring MVC

I'm using hibernate-validator 4.3.1 and Spring MVC 3.2.3. My application has a bean with the following ... more elegant way to achieve 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 - What is the longest expiration time for amazon s3 generated link?

I've tried to set expiration date 2100 year, but it says that it's invalid. Or is it possible to make it permanent somehow? 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 - JPA @JoinColumn annotation with One To One relationship

Is it true that @JoinColumn can be used on both side of One to One relationship in JPA ? I was under ... of one to one relationship ? 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 pause and resume @KafkaListener using spring-kafka

I have implemented the Kafka consumer, now I have a scenario. Read data from the Kafka stream 2.2.5.Release ... String> cr) throws Exception { 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 - NullPointerException when trying to define a custom PropertyMap

I'm using ModelMapper the following way : I have a few converter classes that are Spring components and they ... mapping is working with these public class InnerFoo { priva...

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

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612 views

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java - Constructor bytecode

The ASM guide talks about constructors: package pkg; public class Bean { private int f; public int getF( ... instruction of the constructor? 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 - Spring-boot - add hibernate mapping file to entity manager

I'm migrating legacy app to Spring-boot and have to integrate an hibernate named query mapping file (previously ... properties, it's welcomed! See Question&Answers more detail:os...

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

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751 views

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java - Non english SMS appears as multiple strings?

I am reading text messages in my application. Whenever an SMS arrives it comes to the app and is displayed. It is working ... ); str += " "; } See Question&Answers more detail:os...

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

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590 views

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java - Joda time zone different than JDK's

In my client, I have this code: System.out.println("Java tz: " + TimeZone.getDefault()); System.out.println(" ... and Joda doing it by itself. See Question&Answers more detail:os...

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

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660 views

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java - Does Thread.sleep() makes the UI Thread to sleep?

Will this make the current UI thread to sleep? try { Thread.sleep(20); onProgressUpdate(i); } catch ( ... { e.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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547 views

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java - Tic-Tac-Toe minimax algorithm doesn't work with 4x4 board

So I've been working on this project for the past 3 weeks now. I managed to get the minimax function to work ... you can just comment that out. See Question&Answers more detail:os...

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

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674 views

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java - Convert Date into MYSQL Date Format

I have this MySQL Date data for 6 months in this format: 2010-01-01 to 2010-07-01 But from the UI ... this data into MySQL equivalent format? See Question&Answers more detail:os...

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

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478 views

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java - set the classpath in order to connect between mysql to jdbc

I use the programs: eclipse and mysql. I have a database in mysql and I want to connect between the ... operating system is windows 32bit. See Question&Answers more detail:os...

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

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602 views

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java - HashSet with two equals object?

I created an object HashSet, and the value is an object (Triple) which is my own class. But I get a strange ... )) return true; return false; } See Question&Answers more detail:os...

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

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757 views

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java - How do I display data in horizontal orientation in JSF as repeater in Asp.Net?

I saw datatable component in JSF and it typically renders as table row by row. But what do I do if I ... of database table in column format. See Question&Answers more detail:os...

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

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601 views

1 answer

java - Big O analysis for this for loop

sum = 0; for (i = 1; i <= n; i++) { //#1 for (j = 1; j <= i * i; j++) { //#2 if (j ... loop it could be doing (N^2)/c executions instead of N/c See Question&Answers more detail:os...

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

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841 views

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java - How to prevent ObjectMapper from converting escaped unicode?

I'm using Jackson 2.4 in Java to do some JSON legwork. I make a call to a remote server with Apache ... checking an insane amount of text. See Question&Answers more detail:os...

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

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639 views

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java - How to change color of Editor in Eclipse

I know the preferences are under Preferences>General>Appearance, I played with the color themes and colors of TextEditor, ... I am stuck with. See Question&Answers more detail:os...

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

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