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  • Accessing a file in Windows and Linux when working with JAVA+Eclipse.

    - by Gabriel A. Zorrilla
    Hi there. I'm doing some JAVA coding at home and at work. At home i have Linux, work, Windows. The rootpath to X file in Windows is c:\Documents And Settings\User\My Documents\Dropbox\file.xxx and in Linux is something like /media/My Documents/Dropbox/file.xxx So, every time i edit in either system, i have to manually change the root of the file in a new File(FILEPATH) statement. Is there a workaround for this? I bet if the file root is relative to the project resource tree would do the trick, but that's an Eclipse based solution, not JAVA, i believe.

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  • Having a little trouble with this Java code. Beginner probably mixing some things with C#.

    - by Sergio Tapia
    package practico1; /** * Programador: Sergio Tapia Gutierrez * Fecha: Lunes 10, Mayo - 2010 * Practico: 1 */ public class Main { public static void main(String[] args) { System.out.println("Esta es una pequena aplicacion para mostrar los"); System.out.println("distintos tipos de datos que existen en Java 6."); //boolean, char, byte, short, int, long, float, double, String ejemplosBoolean(); } public void ejemplosBoolean(){ } } So, I'm just testing some things out, but I'm getting an error claiming that I'm trying to run ejemplosBoolean() in a static context when it isn't a static method. My question is, in Java do methods have to have static in order to use them even if they are in the same class?

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  • How to save, retrieve and draw an image using Java and PostgreSQL?

    - by spderosso
    Given an object X; I want this object to have an image. The image must be stored in the database. I can't store the path, the actual image must be in the database. My question can be answered by answering the following subquestions: a). What type of field should I put in the database? (e.g VARCHAR) b) What type of object should I use for storing and manipulating the image (at an object layer)? (e.g java.awt.Image) c) How do I create an object of the type selected (answer of question b) from the data obtained from the database? d) How do I save an object of the type selected (answer of question b) to the database? e) How do I draw the image on a web page? I am using PostgreSQL, Java and it is a web application. Thanks!

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  • Getting Out Of Memory: Java heap space, but while viewing heap space it max uses 50 MB

    - by ikky
    Hi! I'm using ASANT to run a xml file which points to a NARS.jar file. (i do not have the project file of the NARS.jar) I'm getting "java.lang.OutOfMemoryError: Java heap space. I used VisualVM to look at the heap while running the NARS.jar, and it says that it max uses 50 MB of the heapspace. I've set the initial and max size of heapspace to 512 MB. Does anyone have an ide of what could be wrong? I got 1 GB physical Memory and created a 5 GB pagefile (for test purpose). Thanks in advance.

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  • Java binary files writeUTF... explain specifications...

    - by user69514
    I'm studying Java on my own. One of the exercises is the following, however I do not really understand what it is asking to.... any smart java gurus out there that could explain this in more detail and simple words? Thanks Suppose that you have a binary file that contains numbers whos type is either int or double. You dont know the order of the numbers in the file, but their order is recorded in a string at the begining of the file. The string is composed of the letters i for int, and d for double, in the order of the types of the subsequent numbers. The string is written using the method writeUTF. For example the string "iddiiddd" indicated that the file contains eight values, as follows: one integer, followed by two doubles, followed by two integers, followed by three doubles. Read this binary file and create a new text file of the values written one to a line.

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  • It is possible to call a servlet from a Java class?

    - by Renan Mozone
    I'm using IBM WebSphere as my servlet container. My application has several servlets and Java classes. My intent is to call one of those servlets directly from a Java class. Doing some research I figured out that is possible to use the RequestDispatcher interface to achieve this. But it is necessary to pass the objects ServletRequest and ServletResponse as arguments to the method forward(). There is some way to bypass this safely and "nicely"? By "nicely" I meant to say preserving good programming and design patterns.

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  • Google App Engine - Memcache - Java version of Python's client.add?

    - by Spines
    The python interface to the memcache has an add method: add(key, value, time=0, min_compress_len=0, namespace=None) Sets a key's value, if and only if the item is not already in memcache. ... The return value is True if added, False on error. So with this you can add an item if it doesn't exist, and see if it previously existed by the return value. The java memcache api equivalent for this doesn't let you know if there was a previous value or not: put(key, value, expiration, MemcacheService.SetPolicy.ADD_ONLY_IF_NOT_PRESENT); MemcacheService.SetPolicy.ADD_ONLY_IF_NOT_PRESENT: add the value if no value with the key, do nothing if the key exists Is there a way to know if a previous value existed or not with the java api? I can't just check with the contains method beforehand, because in between the call to contains and the call to put, another JVM instance could modify the memcache.

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  • What stack would you use for a new web Java project if you started today?

    - by Joelio
    If you were to start a brand new java project today with the following requirements: high scale (20k + users) you want to use something that is fairly mature (not changing dramatically) & wont be dead technology in 3 years you want something very productive (no server restarts in dev, save the code and its automatically compiled and deployed), productivity and time to market are key. some amount of ajax on front end no scripting language, jruby, groovy, php etc , has to be java has to support i8n What stack would you use & Why? (when I say stack, I mean, everything soup to nuts, so app server, mvc framework, bean framework, ORM framework, javascript framework etc...)

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  • eclipse adt 17 and the libs folder

    - by max4ever
    Ok so i update to eclipse adt to version 17 and I get this error 04-05 12:28:55.810: E/AndroidRuntime(5470): FATAL EXCEPTION: main 04-05 12:28:55.810: E/AndroidRuntime(5470): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.galeola.agentis/com.galeola.agentis.activity.GestionaleActivity}: java.lang.ClassNotFoundException: com.galeola.agentis.activity.GestionaleActivity in loader dalvik.system.PathClassLoader[/system/framework/com.google.android.maps.jar:/data/app/com.galeola.agentis-1.apk] 04-05 12:28:55.810: E/AndroidRuntime(5470): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1742) 04-05 12:28:55.810: E/AndroidRuntime(5470): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1834) 04-05 12:28:55.810: E/AndroidRuntime(5470): at android.app.ActivityThread.access$500(ActivityThread.java:122) 04-05 12:28:55.810: E/AndroidRuntime(5470): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1027) 04-05 12:28:55.810: E/AndroidRuntime(5470): at android.os.Handler.dispatchMessage(Handler.java:99) 04-05 12:28:55.810: E/AndroidRuntime(5470): at android.os.Looper.loop(Looper.java:132) 04-05 12:28:55.810: E/AndroidRuntime(5470): at android.app.ActivityThread.main(ActivityThread.java:4126) 04-05 12:28:55.810: E/AndroidRuntime(5470): at java.lang.reflect.Method.invokeNative(Native Method) 04-05 12:28:55.810: E/AndroidRuntime(5470): at java.lang.reflect.Method.invoke(Method.java:491) 04-05 12:28:55.810: E/AndroidRuntime(5470): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:844) 04-05 12:28:55.810: E/AndroidRuntime(5470): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602) 04-05 12:28:55.810: E/AndroidRuntime(5470): at dalvik.system.NativeStart.main(Native Method) 04-05 12:28:55.810: E/AndroidRuntime(5470): Caused by: java.lang.ClassNotFoundException: com.galeola.agentis.activity.GestionaleActivity in loader dalvik.system.PathClassLoader[/system/framework/com.google.android.maps.jar:/data/app/com.galeola.agentis-1.apk] 04-05 12:28:55.810: E/AndroidRuntime(5470): at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:251) 04-05 12:28:55.810: E/AndroidRuntime(5470): at java.lang.ClassLoader.loadClass(ClassLoader.java:540) 04-05 12:28:55.810: E/AndroidRuntime(5470): at java.lang.ClassLoader.loadClass(ClassLoader.java:500) 04-05 12:28:55.810: E/AndroidRuntime(5470): at android.app.Instrumentation.newActivity(Instrumentation.java:1022) 04-05 12:28:55.810: E/AndroidRuntime(5470): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1733) 04-05 12:28:55.810: E/AndroidRuntime(5470): ... 11 more however if i move my libraries to /libs i can start the applications, but with the libraries in /libs javadoc and javasources stops working, while if they are not in /libs javadoc and javasource works, so I don't understand why.

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  • How to launch standard browser out of Java application?

    - by Peter
    Hi there how to I open a URL with the systems standard browser with Java? I currently use this code for opening a specific URL (locally stored html file), which works fine when I run the application with my IDE (Eclipse), but after bundling the software, it doesn't work any more. url = MainWindow.class.getResource("mySite.html"); helpMenuItem.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { try { java.awt.Desktop.getDesktop().browse(url.toURI()); } catch (URISyntaxException e1) { e1.printStackTrace(); } catch (IOException e1) { e1.printStackTrace(); } } }); Any suggestsions? Thank you very much!

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  • Java for each vs regular for -- are they equivalent?

    - by polygenelubricants
    Are these two constructs equivalent? char[] arr = new char[5]; for (char x : arr) { // code goes here } Compared to: char[] arr = new char[5]; for (int i = 0; i < arr.length; i++) { char x = arr[i]; // code goes here } That is, if I put exactly the same code in the body of both loops (and they compile), will they behave exactly the same??? Full disclaimer: this was inspired by another question (Java: are these 2 codes the same). My answer there turned out not to be the answer, but I feel that the exact semantics of Java for-each has some nuances that needs pointing out.

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  • How do I get Java to use my multi-core processor?

    - by Rudiger
    I'm using a GZIPInputStream in my program, and I know that the performance would be helped if I could get Java running my program in parallel. In general, is there a command-line option for the standard VM to run on many cores? It's running on just one as it is. Thanks! Edit I'm running plain ol' Java SE 6 update 17 on Windows XP. Would putting the GZIPInputStream on a separate thread explicitly help? No! Do not put the GZIPInputStream on a separate thread! Do NOT multithread I/O! Edit 2 I suppose I/O is the bottleneck, as I'm reading and writing to the same disk... In general, though, is there a way to make GZIPInputStream faster? Or a replacement for GZIPInputStream that runs parallel? Edit 3 Code snippet I used: GZIPInputStream gzip = new GZIPInputStream(new FileInputStream(INPUT_FILENAME)); DataInputStream in = new DataInputStream(new BufferedInputStream(gzip));

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  • Casting to generic type in Java doesn't raise ClassCastException?

    - by Kip
    I have come across a strange behavior of Java that seems like a bug. Is it? Casting an Object to a generic type (say, K) does not throw a ClassCastException even if the object is not an instance of K. Here is an example: import java.util.*; public final class Test { private static<K,V> void addToMap(Map<K,V> map, Object ... vals) { for(int i = 0; i < vals.length; i += 2) map.put((K)vals[i], (V)vals[i+1]); //Never throws ClassCastException! } public static void main(String[] args) { Map<String,Integer> m = new HashMap<String,Integer>(); addToMap(m, "hello", "world"); //No exception System.out.println(m.get("hello")); //Prints "world", which is NOT an Integer!! } }

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  • Swing: what to do when a JTree update takes too long and freezes other GUI elements?

    - by java.is.for.desktop
    Hello, everyone! I know that GUI code in Java Swing must be put inside SwingUtilities.invokeAndWait or SwingUtilities.invokeLater. This way threading works fine. Sadly, in my situation, the GUI update it that thing which takes much longer than background thread(s). More specific: I update a JTree with about just 400 entries, nesting depth is maximum 4, so should be nothing scary, right? But it takes sometimes one second! I need to ensure that the user is able to type in a JTextPane without delays. Well, guess what, the slow JTree updates do cause delays for JTextPane during input. It refreshes only as soon as the tree gets updated. I am using Netbeans and know empirically that a Java app can update lots of information without freezing the rest of the UI. How can it be done? NOTE 1: All those DefaultMutableTreeNodes are prepared outside the invokeAndWait. NOTE 2: When I replace invokeAndWait with invokeLater the tree doesn't get updated. NOTE 3: Fond out that recursive tree expansion takes far the most time. NOTE 4: I'm using custom tree cell renderer, will try without and report. NOTE 4a: My tree cell renderer uses a map to cache and reuse created JTextComponents, depending on tree node (as a key). CLUE 1: Wow! Without setting custom cell renderer it's 10 times faster. I think, I'll need few good tutorials on writing custom tree cell renderers.

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  • What XSLT processor should I use for Java transformation?

    - by Artic
    What XSLT processor should I use for Java transformation? There are SAXON, Xalan and TrAX. What is the criteria for my choice? I need simple transformation without complicated logical transformations. Need fast and easy to implement solution. APP runs under Tomcat, Java 1.5. I have some jaxp libraries and could not understand what is the version of jaxp used. Thanks in advance. Best regards.

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  • Is there Java counterpart for Aspnet 4's <%: %> XSS prevention?

    - by Tomas Tintera
    I'm developer moving from C# to Java. Heard about new ASP net feature. <%: %. It renders object with html encoding. Only these impolementing IHtmlString interface are not encoded (to prevent double encoding). See more in http://weblogs.asp.net/scottgu/archive/2010/04/06/new-lt-gt-syntax-for-html-encoding-output-in-asp-net-4-and-asp-net-mvc-2.aspx Is such cute tool in Java side? I mean a way to output a string to webpage and (not)encode it based on it's type.

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