Recent questions tagged JAVA

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java - How to check if a text is transparent with pdfbox

I subclassed PDFStreamEngine and overloaded processTextPosition, I am now able to reconstruct the text like ... is transparent ? 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 - Netbeans 10.0 doesn't start in Windows 10 OS

I've just downloaded Netbeans 10.0 and on a Windows 10 64 bit it doesn't start when i execute netbeans64. ... . Somebody else with same issue? 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 - Setting double from within LocationListener

It looks like I'm having some kind of strange variable setting problem. I have a LocationListener that updates ... 0.0 for both variables. 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 - ClassCastException when calling TreeSet<Long>.contains( Long.valueOf( someLongValue ) )

Im stumped. I declare my set thusly: private Set<Long> applicationIds; Then I populate it like this: ... better explanation of the problem. 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 - Retrieving images using Jquery and servlet produces HTTP Status 500 error

I need to retrieve images from my database. For this I used jquery and servlet to retrieve all images stored in a table. ... ...... 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 delete multiple rows from JTable , database at a time

I want to delete several rows from JTable at once but I'm only able to delete only one row at a time. Does ... +w); w.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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java - trying to retrieve both text and blob from mysql to jtable

So I'm trying to retrieve text and a blob(image) from a database inside a jtable in a nice way. For ... "possible duplicate" 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 - Sending the JFrame information to the Printer

The application is for pulling information to fill out a form from a database or write to the database from this form. ... true); } }); } } 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 - Static Error: This class does not have a static void main method accepting String[]

I'm learning, I'm newbie but I wanted to know what I do to get "run" it. this happening a error: Static Error: ... b); } } } } // Carneirinho 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 - Missing memory: size of young generation includes only one survivor space

On the Java heap, I expected that the size of the young generation would be the sum of the sizes of the ... size] 943744K = 838912K + 104832K 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 while deploying Quartz in Spring Boot

I am trying to use Quartz 2.2.1 with spring boot. Im trying to declare a scheduled task that ... method im facing the javaNullPointerException. 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 - Is there a way to Route logs based on Marker with the RoutingAppender in Log4j2

It is possible to filter messages using markers, such as : <MarkerFilter marker="FLOW" onMatch="ACCEPT" onMismatch ... those values in Lookup? 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 8 stream groupingBy into collection of custom object

I have the following class structure public class Store { private Long storeId; private Long masterStoreId; private String ... ) -> a1)); See Question&Answers more detail:os...

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

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241 views

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java - Mysql JDBC driver ClassNotFoundException

I can't register Mysql JDBC driver in my desktop APP I download mysql-connector-java-5.1.16.zip ... ) throws ClassNotFoundException Whats wrong? 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 wrong with my Code in relation to creating a constructor?

I am trying to create a Person class, with a constructor that initiates the instance variables with the given parameters ... :54) Java Result: 1 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 - Resultset in session

What are the disadvantages of placing resultset in session? if not which is the best possible way.I tried to ... it not affect the performance? 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 - Create "loading" animation easily

I have an android listView with an image in each item. It takes a while till the image is loaded. How can ... and I cannot stop any animation? 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 make my program repeat according to certain circumstances?

import java.util.Scanner; public class MyFirstGame { public static void main(String[] args) { Scanner scanner = new ... to improve it. 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 - I keep getting a "The operator == is undefined for the argument type(s) boolean, int" and have no idea how to fix it

I keep getting a "The operator == is undefined for the argument type(s) boolean, int" in this bit of code at ... (Exception 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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239 views

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java - working with IC card reader and SLE5528 smart card

Am having an IC contact card reader and SLE5528 smart cards.Am wondering how to get started working with these ... great help 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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223 views

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java - Is it possible to configure unified format of date format for whole struts webapp?

In any case I get exception Could not parse date. There is unified company standard of date format - ' ... server to match Struts expectations? See Question&Answers more detail:os...

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

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238 views

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java - How to force re-use of connections in jdbc pool?

I've got a Runnable which gets a connection from a connection pool as below and has 60 seconds to do something ... connections to be re-used ? 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 - Uncertainties regarding Implementation of Actions and Usage of a single Model with multiple Views

I'm a total newbee regarding GUI programming and maybe my problem has a quite simple solution. I'm ... this must be accomplished feasible? See Question&Answers more detail:os...

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

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296 views

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java - Counting numbers up and down using Recursion

Given two numbers, let's say start = 1 and end = 4, I am trying to count all the numbers in sequence up and ... countUpDown(start + 1, end); } } 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 - Selenium: submit() works fine, but click() does not

I have submit button, which is only one on the page, and it's in form. html part: <form class="search-form ... works fine, click() - does not. See Question&Answers more detail:os...

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

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575 views

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java - Getting error when mapping PostgreSQL LTREE column in hibernate

I am trying to map postgresql ltree column in hibernate as follows: In entity : private String path; @Column(name ... how to resolve this issue? See Question&Answers more detail:os...

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

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189 views

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java - Unit Test of file upload using MockMvcBuilders with standalone context and SpringBoot 1.2.5

I'm using Spring Boot 1.2.5-RELEASE. I have a controller that receive a MultipartFile and a String ... the AService instance. Any solution? See Question&Answers more detail:os...

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

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305 views

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java - Create objects without causing a stack overflow error?

So, I have my main class that calls private Secondary secondary = new Secondary(); when it runs. In the ... they are not in 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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