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• How do I keep a datastructure in sync across several servers in Java?

  - by sanity

  Have a Map which contains objects that I want to keep in sync across multiple servers, such that if objects in the map are created, deleted, or modified - this is reflected immediately (ie. within a second or two) across all servers, in a way that can potentially scale up to tens of servers. Is there a lightweight open source Java tool that can do something like this? I'm aware of Terracotta but it is rather heavy weight for what I need.

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• Does grails support logging from the src/java classes?

  - by rainyday

  I have a grails app (v 1.1.2) the logging is working fine from the groovy classes, but I can't get it to work from within a java source... I have a class in package com.mforms.devices., it imports apache log4j, defines the logger as follows private final org.apache.log4j.Logger loggy = Logger.getLogger(this.getClass()); then refer to it later by doing loggy.error("...") my Config.groovy has the following log4j = { error 'com.mforms' root { error 'stdout', 'file' additivity = true } } What am I doing wrong?!?!

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• what java method takes an int and returns +1 or -1?

  - by David

  what java method takes an int and returns +1 or -1? the criteria for this is weather or not the int is positive or negative. I looked through the documentation but i'm bad at reading it and i can't find it. I know i've seen it somewhere though.

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• Is there a timeout for threads waiting on a synchronised method in Java?

  - by MalcomTucker

  Is there a default timeout for threads waiting on a synchronised method in Java? Some threads in my app are not completing as expected. Is there anyway to check whether threads have died as a result of timeouts?

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• Can we run an Java app in a system without JRE?

  - by Praveen Chandrasekaran

  Hi Folks, I created an java apllication. i created the Excecutable jar and Exe files for my application. But it cant be run at a system which not installed computer. How to do it? Is there any possible to configure the JRE in the EXEcutable jar or Exe file itself? Any Idea?

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• Are there java libraries to do a word-based diff?

  - by Mycol

  I have two pieces of text. I would like to make a word-based diff between them (like whe unix utility wdiff does) but with more information in the output (I mean, the character's posizion where the added/delited word starts). I need to do this in Java, so a simple output of the differences (like wdiff) doesn't suite for me: I would like to manipulate objects representing differences.

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• How do I set the position of the mouse in Java?

  - by byte

  I'm doing some Swing GUI work with Java, and I think my question is fairly straightforward; How does one set the position of the mouse?

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• Java: Storing information from database. What collections are appropriate?

  - by garvy

  I write an application in Java. I get form a database a table (clients) which contains fields like: name | surname | adress What is the best solution to store this data in my app? Should I create an object for each client and store these objects in a list or set? The table contains about 100 records and it's already sorted. Thanks in advance.

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• How to make switch case accept multiple data types in Java?

  - by Starx

  While using Java's switch case, it excepts only char and int, but I want to provide string cases. How to make this possible?

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• Why Java does not allow overriding equals(Object) in an Enum?

  - by Ashwin Prabhu

  @Override public boolean equals( Object otherObject ) is not allowed in Java for an Enum, since the method equals(Object x) is defined as final in Enum. Why is this so? I cannot thing of any use case which would require overriding equals(Object) for Enum. I'm just curious to know the reasoning behind this behavior.

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• How can I retrieve the amount of free RAM from a Java program?

  - by swati

  Free RAM: my target metric. Java: my tool of choice. ???: a good way to get the former using the latter.

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• Which is more comfortable software tool for java application developers?

  - by Venkats

  I want some suggestion from you people, which is very comfortable software tool for java developers? Especially application developers....

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• can i use WindowBuilder (java visual editor Eclipse Plugin ) Without GWT Support ??

  - by Salamon

  hello , I'm a little bit confused about it . it seems that it is integrated with Google web kit tools to build Google web apps . but can i use to build a Gui for standard java app , (like netbeans) ?? i know it sounds silly but i spend a lot of time to know if is it possible or not but i couldn't know. notice that i am a mac user , ( WindowBuilder on mac seems not fully supported ) . thanks in advance .

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• how to get svn/cvs log record by java?

  - by Eric

  I want to cut the svn/cvs recods in pieces and then put in to database. After that i can make use of those data easily. Any java function can get out the record? and How? If possible, please provide a example. Thank you.

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• How can two instances of an application communicate in Java?

  - by shubhkarman

  Hello, I am developing a new Java Desktop app. Something like a media player. I want to load most of the resources in the background when the computer starts up. But the users can turn this option off form within the app or using some other utility. So, what I want to do is if a ban instance of the app is already running and the user starts the app again then I can communicate with the already running instance so that it can launch a new window?

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• When and how are classes garbage collected in Java?

  - by Bright010957

  I asked a question about Garbage Collection in Java in this topic. But the answer I got, gave me another question. Someone mentioned that classes can be collected by the garbage collector too. Is this true? And if it is true, how does this work?

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• Is Java worth learning in my late thirties? [closed]

  - by bobi

  Hi guys. First I want to say is that I am 37 years old and not from programmer background (actually from biology). And my question is should I start learning java? I have coded in php and javascript for a year and a half. Every answer would be appreciated Thanks in advance Bobi.

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• How to send mail from any mail id through java?

  - by abc

  How to send mail from any mail id through java? i meant how can we set from : address in mail any that we want.

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• What's the best building tool for java besides ant?

  - by user198729

  Somehow I don't like IDE very much, but I don't find a particular good tool to build java applications from source yet. I welcome all kinds of feedbacks!

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• How do I express ":" but not preceded by "\" in a Java regular expression?

  - by jjujuma

  How can I express "not preceded by" in a Java regular expression? For example I would like to search for ":" but only when it is not directly preceded by "\". How can I do this?

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• How does Java order items in a HashMap or a HashTable?

  - by ComputerJy

  I was wondering how Java sorts items in the Map (HashMap or Hashtable) when they are added. Are the keys sorted by the hashcode, memory reference or by allocation precedence...? It's because I've noticed same pairs in the Map are not always sorted in the same order

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• Is this possible to make as a option dialog in Java?

  - by Raptrex

  I'm wondering how I could make this into a popup dialog. I designed this with Netbeans gui editor. I looked at option dialog, but all the examples only had a textfield or a combobox, not more than one thing like I have. So what would be the best way to make this in Java.

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• Can python code (say if I used djangno) be obfuscated to the same 'level' as c#/java?

  - by Blankman

  If I obfuscated python code, would it provide the same level of 'security' as c#/java obfuscating? i.e it makes things a little hard, but really you can still reverse engineer if you really wanted to, its just a bit cryptic.

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• Why do we make a copy of final instance variable in a method in Java?

  - by PRK

  For instance: private final Object o; public void doSomething(){ final Object local = this.o; //access methods of local; } This practice is followed in lots of java classes (such as ArrayBlockingQueue). What's the benefit of this?

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• What is the equivalent of Java's final in C#?

  - by Nosrama

  What is the equivalent of Java's final in C#? EDIT: Sorry, I should have been clearer. I meant what is the equivalent when applied to a member variable - so it must be assigned once and only once.

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