Recent questions tagged JAVA

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java - How do I ensure another Thread's Handler is not null before calling it?

My program threw a NullPointerException the other day when it tried to use a Handler created on another thread ... any better solutions? 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 convert a String into an array of Strings containing one character each

I have a small problem here.I need to convert a string read from console into each character of string. For ... string.How would I do that? 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 - Restrict download file bandwidth/speed in Servlet

we got high-load java application which works in clustered mode. I need to add ability to download and ... help will be highly appreciated. 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 write JavaScript function to check JRE version

I am new to JavaScript. How to write JavaScript function which will return installed Java version in the computer. Thanks Sunil Kumar Sahoo 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 it possible to run incremental/automated JUnit testing in Eclipse?

Eclipse support incremental compiling. If I save a source file then it will compile the modified files. Is it ... plugins that can do it? 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 - Glassfish 4.1 can't run RestFul service when using ear/ejb/web module

I've a lot of jee7 maven projects (ears with web and ejb modules) with RestFul services that run ... :1682) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV...

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

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java - Using Session Scope in Spring Beans

I'm using JSF 2 for the view and Spring for the business logic. I'm trying to set a session scope to one ... What am I doing wrong? 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 - What is the difference between being shallowly and deeply equal? How is this applied to caching?

Found the following in my notes, but I am unable to make sense of it: Primitive type wrapper classes implement ... why it would be useful. 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 - Using Hibernate 4's Integrator pattern and Spring's dependency injection

I'm used to using Spring to do my dependency injection like so: <context:component-scan base-package="org.emmerich. ... } Is there a better 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 - Use of Google-collections MapMaker?

I just came across this answer in SO where it is mentioned that the Google-collections MapMaker is awesome.I ... appropriate to use a MapMaker. 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 Basic Authentication and OAuth2 in same project?

Is it possible to use OAuth2 for certain endpoints in my rest application and use basic authentication too for some ... can help me further. 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. Launch app from Dialer

This is what I have so far but nothing happens when I input this combination in dialer public class DialReceiver ... /intent-filter> </receiver> 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 parameter types using reflection?

I want to use functions having different numbers of parameters. The problem is that I don't know the ... parameter types for each function? 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 check if a file is readable?

I'm writing Java 6 application and I have to check if a file is readable. However, on Windows canRead() ... how to deal with this 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 - Get Checkbox value in a table in JavaFX

I have a table and it has a column with checkboxes. On a button click I want to find out which ... is the instanceof check not working? See Question&Answers more detail:os...

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

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325 views

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java - Real-time Bluetooth SPP data streaming on Android only works for 5 seconds

I have a home-made bluetooth device measuring ECG at 500Hz: every 2 ms the device sends 9 bytes of data (header, ... available + " bytes available, requested " + buffer.length );...

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

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java - How can I solve the Android Firebase error "Default FirebaseApp is not initialised in this process"?

I am using FirebaseAuth for user registration with email and password, and I have already added the plugin and ... app not starting properly? 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 marshall multiple objects using JAXB?

I'm trying to marshall multiple objects e.g. Book added into BookLists via setBookslst(). I begin using this ... not available in my version. 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 - Debugging JNLP started application

I created a Java desktop-application (using Swing) and am now trying to make it work by starting it from ... with a normal desktop application? 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 GWT CellTable Dynamically

I am stuck in a problem with GWT CellTable. I need to create celltable dynamically and I dont have entity ( ... Please help. Thankx, Regards, See Question&Answers more detail:os...

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

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220 views

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java - Password protecting my android app (the simple way)

I've built my first app, and I would like to password protect it. It's fine for me to store the password in ... mpbuttonclick.start(); }}}); }} 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 - Login Application with 1 stage and multiple scene in JavaFX

I am doing a timeline project. I have successfully created a login system and menus for everything, but when I ... for the arguments (Object)" 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 - Does thread.yield() lose the lock on object if called inside a synchronized method?

I understand that Thread.currentThread().yield() is a notification to thread scheduler that it may assign cpu cycle ... assign cup to thread2. See Question&Answers more detail:os...

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

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190 views

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java - Spring and passing parameters to factory-method in runtime

The documentation of method context.getBean(name, user) says Allows for specifying explicit constructor arguments / factory ... not, it fails. 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 reading of little endian integers from file

I need to read a binary file consisting of 4 byte integers (little endian) into a 2D array for my Android ... on how to speed this up? See Question&Answers more detail:os...

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

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253 views

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java - Language detection with data in PostgreSQL

I have a table in PostgreSQL where a column is a text. I need a library or tool that can identify the ... solutions in any language are 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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175 views

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java - How to show hashmap values in jsf?

I have bean "MyBean", which has property HashMap - "map" which values type is MyClass. I want to show some ... am wrong? And how fix that? 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 - copy directory from assets to data folder

I would like to copy a quite big directory from the assets folder of my app to the data folder on the first ... is Android 4.2. Thanks, Yannik See Question&Answers more detail:os...

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

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