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• Does anyone know of a good guide to configure GC in Java?

  - by evilpenguin

  I'm having trouble with a JVM running an app, whose heap memory looks like a comb. It's constantly jumping from 1.5 GB to 3 GB and slowly deteriorating to higher values. I'm using G1 GC algorithm, but have no idea how to configure it. I do not have access to the code of the app I'm running and, needless to say, it's a rather large app. So, bottom line, does anyone know of a good guide to configure GC in Java?

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• Java Servlets - How do I detect if a user is from a mobile device?

  - by Spines

  Java Servlets - How do I detect if a user is from a mobile device? I'm using the TinyMCE javascript editor, and it doesn't work on the iphone. How can I detect if the user is coming from a mobile device?

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• Tool for converting subset of PHP code into Java/Scala/Groovy?

  - by Alex R

  Do any exist? Ideally it would also come with a library of basic PHP functions. I have a bunch of simple PHP scripts (no extensions, no fancy dynamic hacks, etc) I'd like to convert to Java... It would be great if a tool could do 80% of the work while I do the other 20%.

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• in java what is the syntax for commenting out multiple lines?

  - by David

  in java what is the syntax for commenting out multiple lines? i want to do something like: (comment) LINES I WANT COMMENTED LINES I WANT COMMENTED LINES I WANT COMMENTED (/comment)

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• How to find and kill running Win-Processes from within Java?

  - by GHad

  Hi, I need a Java way to find a running Win process from which I know to name of the executable. I want to look whether it is running right now and I need a way to kill the process if I found it. Thank you! Greetz, GHad

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• Is Maven 1.0.2 compatible with Java 5?

  - by hdk

  I'm working on an upgrade project and build management is done in Maven 1.0.2. Java version will change to J2SE 5. Please include in your answer if you have first hand experience on that particular combination (Maven 1.0.2 and J2SE 5) Thanks hdk

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• Any way to force classes to have public static final field in Java?

  - by serg555

  Is there a way to force classes in Java to have public static final field (through interface or abstract class)? Or at least just a public field? I need to make sure somehow that a group of classes have public static final String TYPE = "..."; in them.

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• How would you convert a String to a Java string literal?

  - by Simon Nickerson

  This is sort of the Java analogue of this question about C#. Suppose I have a String object which I want to represent in code and I want to produce a string literal that maps to the same thing. I was just about to write a state machine that ingests the string character by character and escapes appropriately, but then I wondered if there was a better way, or a library that provides a function to do this.

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• How to check if a given Regex is valid? (Java)

  - by Philipp Andre

  Hi folks, I have a little program allowing users to type-in some regular expressions. afterwards i like to check if this input is a valid regex or not. I'm wondering if there is a build-in method in Java, but could not find such jet. Can you give me some advice? Best regards Phil

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• I'm trying to simulate a directly mapped cache in java. Any ideas on which data structure to use to

  - by bananamana

  I'm trying to simulate a directly mapped cache in java. Any ideas on which data structure to use to represent the cache?

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• How to check if an Object is a Collection Type in Java ?

  - by Tony

  By using java reflection, we can easily know if an object is an array. What's the easiest way to tell if an object is a collection(Set,List,Map,Vector...)?

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• Can I run a webpage-embedded Java Applet on the iPhone's web browser?

  - by Warlax

  Can I run a Java applet that's been embedded in an or HTML tag on an iPhone? I don't mean as an App but actually through its browser.

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• How to cache *any* object type to memory/disk in java?

  - by Blankman

  Is there a generic way to cache any type of object (be in a java class, or a word document etc.) to memory or disk? Is simply serializing the object, and retaining the file extension (if it has one) enough to rebuild the object?

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• Why is Javascript called Javascript, if it has nothing to do with Java?

  - by Neeraj

  Why Javascript is called Javascript (there is no relation between Java and Javascript) why its not called HTMLScript or XMLScript. Any historical reason for this?

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• Can I use a static variable from a Java class in res/values/styles.xml?

  - by neu242

  I want to refer to a static Java variable in my styles.xml, is that possible? Here's a pseudo-xml example: <style name="Artwork"> <item name="android:background">@drawable/border_{Constants.MY_COLOR}</item> </style>

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• Does the for foreach construct in java create a hard or soft copy?

  - by Doug

  Say I have the following piece of java code ArrayList<Double> myList = new Double[100]; for (Double x : myList) x = randomDouble(); Does this actually modify myList or just the dummy variable? I realize I should just try this code segment out, but I think this is the sort of thing I should be able to google or search for on this site, and several queries so far have turned up nothing useful.

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• How can I add files to java app in android so I can get it path?

  - by masterkapu

  I want to add files to java app in android so I'll know their path and can access them. How can I do it? (It doesn't matter where they will be the most important is that I can access them and I'll know the relative path of the them)

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• What is best practise in converting XML to Java object?

  - by newbie

  I need to convert XML data to Java objects. What would be best practise to convert this XML data to object? Idea is to fetch data via webservice (it doesn't use WSDL, just HTTP GET queris, so I cannot use any framework) and answers are in XML. What would be best practise to handle this situation?

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• How and where do you define your own Exception hierarchy in Java?

  - by EugeneP

  How and where do you define your own Exception hierarchy in Java? My main question concerns package location where they your Exception classes must be defined. Do we create a special package ourexceptions and put all classes inside it?

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• How can I get the invocation handler for a Java proxy?

  - by ripper234

  Given: Object innerProxy = ... Object proxy = java.lang.reflect.Proxy. newProxyInstance(Thread.currentThread().getContextClassLoader(), new Class[]{type}, innerProxy); How can I extract the innerProxy object from proxy?

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• How can I create a bar in the bottom of a Java app, like a status bar?

  - by paintrick

  I am in the process of creating a Java app and would like to have a bar on the bottom of the app, in which I display a text bar and a status (progress) bar. Only I can't seem to find the control in NetBeans neither do I know the code to create in manually. Thank you so much for helping! Paintrick

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• Do different JDK Updates produce different Java byte code?

  - by Bernhard V

  A hypothetical scenario: I've got a project whose source compliance level is specified to 1.5. Now I compile this project with two different JDKs: At first with JDK 6 Update 7 and then with JDK 6 Update 20. Do these two different JDKs produce different Java byte code, although they only differ in their Update version?

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• What is best practice in converting XML to Java object?

  - by newbie

  I need to convert XML data to Java objects. What would be best practice to convert this XML data to object? Idea is to fetch data via a web service (it doesn't use WSDL, just HTTP GET queries, so I cannot use any framework) and answers are in XML. What would be best practice to handle this situation?

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• How To Read Signal Strength In C++ and Java ?

  - by sultan

  How can I read wireless signal strength In C++ and Java ? Please provide a code snippet, a link to a library, or anything else that might show me how to accomplish this?

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• does java have an in-built Antivirus? is it true?

  - by androidbase Praveen

  Does the Java have an in-built antivirus? One of my friends told me there is in the JDK itself - it's called the "sandbox". Is it true?

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