Recent questions tagged Java

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java - transient for serializing singleton

Effective Java - To maintain the singleton guarantee, you have to declare all instance fields transient and ... I Missing something here? 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 clone old builder to make a new builder object?

I have a builder class which I am using in one of my project. Let's say I have metricA as builder based on ... two things but in a right way. 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 - count characters, words and lines in file

This should count number of lines, words and characters into file. But it doesn't work. From output it shows ... 's going on. Any suggestions? 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 - Android 11: Primary directory (invalid) not allowed for content://media/external/file allowed directories are [Download, Documents]

I am trying to create PDF file from base64 string. Because of Storage Update in Android 11, I have to change ... fix problem. 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 to find servlet API version for glassfish server?

While coding a servlet I found a method that says Since: Servlet 3.1 I guess that if I have the autohint from ... not even for mine -4.1 ) 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 - JTable Row selection background problem.

I have a JTable and to set a picture as background in JTable and other properties i used this code. ... for my JTable named tblMainView 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 - Fast scroll large letter thumb preview not appearing

I'm trying to get the fast scroll pop up containing the large letter to appear when I the fast scroll feature in ... : mData) { if (str.getName().toLowerCase().contains(constraint...

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

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java - Can the FTP client control FTP server time-out settings?

I am using Apache Commons-Net library in Java What I want is to set the connection time-out of the FTP-server on ... (ms); Please 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 - Add listener to SpanElement

I wanna add mouse over listener to SpanElement, which i created by: SpanElement span = Document.get(). ... it possible? Thank you. 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 - Detect First Run

I am trying to detect if my app has been run before, by using this code: (This is in my default Android ... there something wrong with my code? 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 - Placing a marker within the image

i have written a code which displays an image in a tabbed pane. My code lookes like this class tracker extends ... the image is welcome.... 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 enable circular reference in spring framework?

greetings all sometime in my app the logic forces me to use circular reference and i want to know how to enable this configuration in spring ? 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 connect Android Studio with SQL Server database?

We are currently having the same problem as here: How to connect Android Studio with SQL Server database, but ... .main(ZygoteInit.java:1120) 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 Retry doesn't works when we use RetryTemplate?

I've Develop a retry mechanism by taking a reference from the following course. Below is the code I developed in Spring Batch, ... ======"); } } 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 - Exception using POI

I'm using poi 3.7 , upload the file is .xlsx The console show: org.apache.poi.POIXMLException: org.apache.poi. ... .java:39) ... 3 more See Question&Answers more detail:os...

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

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532 views

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java - Antlr : beginner 's mismatched input expecting ID

As a beginner, when I was learning ANTLR4 from the The Definitive ANTLR 4 Reference book, I tried to run my ... me some suggestion, thank you! 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 - JavaFx Images Path

I have a problem with my Java class. Actually the code is correctly, but if I click the run-button there's a ... code 1 Can anybody 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 - application connect to database

I am working on an application that will be used by schools. Each school will set up their on database. And ... , please let me know. 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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500 views

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java - Spring cloud stream to support routing messages dynamically

i want to create a common project (using spring cloud stream) to route messages to different (consumer) projects ... way to accomplish that? thx 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 - Restlet Complex Object to XML serializaton

I have restlet web service which returns response as xml. I'm using Jackson as binder. below is class I'm ... body> </body> </ApiResponse> 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 open local pdf file in WebView Android Studio

I am aware that this question has been asked many times, but I still cannot get it to work. I have a pdf ... take up the entire activity page? See Question&Answers more detail:os...

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

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369 views

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java - Google Maps: Current Location Marker (Period updates for GMaps)

So I've been able to get periodic updates of my current location through the developer android page, making your app ... the new lat and long? See Question&Answers more detail:os...

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

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314 views

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java - How to upload a WAV file using URLConnection

Curretly, I can upload .wav files by using this command in Terminal (MAC): curl -H 'X-Arg: AccessKey=3f55abc5-2830- ... FAILED"); result = 0; } See Question&Answers more detail:os...

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

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375 views

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java - how use 2 recyclerView in BottomSheetDialogFragment

my class extends from BottomSheetDialogFragment and in this layout use 2 recyclerViews. but always 1 ... design.widget.CoordinatorLayout> 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 - Improve performance on sending bulk emails through spring-mail

I have a spring-stand alone application which uses simple spring email code as below , the to and the message is ... for your time and 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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491 views

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java - Auto-logout in JSF Application

I have a JSF app and would like to have the user auto logout after a period of inactivity. Is there an standard way to do 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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417 views

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java - Distinction between ClassObject.getClass,ClassName.class and Class.forName("ClassName")

I wish to understand if both Class.forName("ClassName") and ClassObject.getClass return runtime instance of the ... ") suffice?? 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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423 views

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java - Why can't Impala read parquet files after Spark SQL's write?

Having some issues with the way that Spark is interpreting columns for parquet. I have an Oracle source with ... the parquet file for decimal? See Question&Answers more detail:os...

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

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