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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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• How do I create a "global variable" in Java such that all classes can access it?

  - by Chrystle Soh

  here's my problem: I have multiple classes that are part of the same package and they need access to a certain file path String filePath = "D:/Users/Mine/School/Java/CZ2002_Assignment/src/" Rather than declaring the same Filepath in every single class, is it possible to simply have a "global" type of variable of this FilePath so that all classes can access it and I only need to declare and update it once. Thanks

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• Does the List in .NET work the same way as arraylist in Java?

  - by eflles

  When I learned Java, I was told that the arraylist works this way: It creates an array with room for 10 elements. When the 11th element is added, it is created a new list with room for 20 elements, and the 10 elements are copied into the new array. This will repeat as until there are no more elements to add, or to a maximum size. Is the List in .NET constructed the same way?

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• What's a good free tool for investigating unintentional object retention in Java?

  - by Steve Emmerson

  My multithreaded Java program crashes because it runs out of heap space and I don't think it should. Assuming the culprit is unintentional object retention, what's a good free tool to investigate what objects are being unintentionally retained? My IDE is Eclipse.

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• What is the difference between a stream and a reader in Java?

  - by Bragaadeesh

  Hi, Today I got this question for which I think I answered very bad. I said stream is a data that flows and reader is a technique where we read from that is a static data. I know this is an awful answer, so please provide me the crisp difference and definitions between these two with example in Java. Thanks.

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• Can we call methods of non-static classes without an object in Java?

  - by ask

  In Java, the wrapper class Integer has the static method parseInt() which is used like this: Integer.parseInt(). I thought only methods of static classes could be called like this (ie. Class.doMethod()). All non-static classes need objects to be instantiated to use their methods. I checked the API, and apparently Integer is declared as public final Integer - not static. Someone please help me understand this.

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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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• What is the best open-source java charting library? (other than jfreechart)

  - by pyinsci

  Why are there not more opensource easy to use charting libraries for Java?. The only successful opensource project in this area seems to be jfreechart, and it doesn't even have any documentation or examples available.

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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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• How-to delete indexes in Google App Engine (Java)?

  - by Antonio

  Is there a way to delete unused indexes in Google App Engine Java application? The only one way I was able to find is to create an empty Python GAE application and run the following command: appcfg.py vacuum_indexes /path/to/myapp/ Is there a more intelligent way?

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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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• 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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• 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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• 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 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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