Recent questions tagged Java

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java - Android: HTTPS (SSL) connection using HttpsURLConnection

I have 2 apps, one is a Servlet/Tomcat Server, and the other is an Android app. I want to use HttpURLConnection ... can't solve yet. Any Idea? 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 - @ManagedProperty(value = "#{param.id}") in a non-request Scope Bean

I need to pass a parameter (POST) to a @managedBean, I used managed properties like this: @ManagedProperty(value = ... h:commandLink> </h:form> 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 process a form login using Spring Security / Spring MVC

Simple question, I just need a pointer in the right direction: I have a simple Spring MVC/Spring Security ... how the process should flow. 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 - Order of loading contextConfigLocation in web.xml of Spring Servlet project

Suppose that I have a Spring Java project and I am trying to configure it as a web server servlet. Here is a ... to focus on my main question. 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's the difference between ActivationSpec and ConnectionFactory?

My understanding is that: MDBs (Message Driven Beans) connect via Activation Specification. MDPs (Message Driven POJO) ... Bus Spring JMS vs MDB 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 lookup a JNDI Datasource from outside a web container?

I have the following environment set up: Java 1.5 Sun Application Server 8.2 Oracle 10 XE Struts 2 Hibernate ... A Web Container (through JNDI) 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 audio data from a MP3?

I'm working on an application that has to process audio files. When using mp3 files I'm not sure how to ... represent or how to handle then. 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 - R xlsx package error

Error in .jcall("RJavaTools", "Ljava/lang/Object;", "invokeMethod", cl, : java.util.zip.ZipException: ... colIndex=colIndex, rowIndex=rowIndex)? 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 ThreadPoolTaskExecutor only running one thread

We are using ThreadPoolExecutor in our JMS consumer and injecting it into a DefaultMessageListenerContainer. I expect ... . Any explanation? 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 choose an XSL-transformation?

For a current project the decision has to be made whether to use XML and an XSL-transformation to produce HTML ... 're talking about Java 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 convert number into K thousands M million and B billion suffix in jsp

How can i convert number into K thousands M million and B billion suffix in jsp e.g 1111 as 1.111 K etc 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 - Handling Dao exceptions in service layer

If my Dao layer throws Dao specific exceptions, then does handling them in my service layer consitute a leakage ... thrown by service layer. 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 can I position a layout right above the android on-screen keyboard?

See the attached photo. Twitter does it well. They have a layout, which I will call a toolbar for ... ="adjustResize"> </activity> 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 LinkedHashMap to implement LRU cache

I was trying to implement a LRU cache using LinkedHashMap. In the documentation of LinkedHashMap (http://docs ... anybody know any explanation? 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 register multiple servlets in web.xml in one Spring application

I want to define two servlets in my Spring web.xml - one for the application html/jsp pages, and one ... of their configuration files loaded? 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 does StringBuffer/StringBuilder not override equals or hashCode?

Why does StringBuffer/StringBuilder does not override the equals(), hashcode() methods from object? Please suggest ... understand 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 - Mapping enum to a table with hibernate annotation

I have a table DEAL and a table DEAL_TYPE. I would like to map this code: public class Deal { DealType type ... not start at 1. 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 - Why is it useful to have null values or null keys in hash maps?

Hashtable does not allow null keys or values, while HashMap allows null values and 1 null key. Questions: Why is ... key and values in HashMap? See Question&Answers more detail:os...

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

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321 views

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java - Get local IP-Address without connecting to the internet

So, I'm trying to get the IP-Address of my machine in my local network (which should be 192.168.178.41 ... using either RegEx or the internet? 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 - Better handling of Thread Context ClassLoader in OSGi

I've been using OSGi for a while now and I have various solutions to the problems I encountered. I wanted ... actually seen it work? 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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java - Why can't a class or an interface receive private or protected access modifiers?

I am reading some Java text and the text says that we can only apply public or default access modifier ... or protected access modifiers? 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 - Method accepting two different types as parameter

I am writing a method that should accept as its parameter an object of one of two types which do not share ... of dealing with the situation? 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 does <T extends mean?

I have seen a method like shown below: protected <T extends ABC> T save( T Acd, boolean en) { What ... of method declarations called in Java? 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 - Hibernate JPA, MySQL and TinyInt(1) for Boolean instead of bit or char

Here is my JPA2 / Hibernate definition: Code: @Column(nullable = false) private boolean enabled; In MySql this ... datatype. Is there any? 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 set project.version by passing version property on gradle command line?

I want to build JAR with self-defined version passed via command line, such as: When I execute gradle build task like ... version'] : '10.0.0' See Question&Answers more detail:os...

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

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247 views

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java - How to check if a character in a string is a digit or letter

I have the user entering a single character into the program and it is stored as a string. I would like to ... character entered is a digit."); 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 - JSON jsonObject.optString() returns String "null"

I'm developing an Android App which uses JSON for the server communication and I've got a weird problem when I ... what's going wrong 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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429 views

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java - intelliJ IDEA 13 error: please select Android SDK

I have installed Android SDK 22.3 and JDK 1.7 update 21 on Win7 x64. Now I created an empty android ... 0.1, which is unexpected. cheers See Question&Answers more detail:os...

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

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