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  • Saving objects in servlet session and java.io.NotSerializableException

    - by EugeneP
    SEVERE: IOException while loading persisted sessions: java.io.WriteAbortedException: writi ng aborted; java.io.NotSerializableException: That means this object cannot be persisted on hard disk. Does it imply that it's not safe to keep in Session objects that do not implement "Serializable"? I haven't heard that there are limitations on saving non-serializable objects in Session object. It simply means that Tomcat will always keep them in memory, right?

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  • Java - Layering issues with Lists and Graphics2D

    - by Mirrorcrazy
    So I have a DisplayPanel class that extends JPanel and that also paints my numerous images for my program using Graphics2D. In order to be able to easily customly use this I set it up so that every time the panel is repainted it uses a List, that I can add to or remove from as the program processes. My problem is with layering. I've run into an issue where the List must have reached its resizing point (or something whacky like that) and so the images i want to display end up beneath all of the other images already on the screen. I've come to the community for an answer because I have faith you will provide a good one. DisplayPanel: package earthworm; import java.awt.Graphics; import java.awt.Graphics2D; import java.util.ArrayList; import java.util.List; import javax.swing.JPanel; public class DisplayPanel extends JPanel { private List<ImageMap> images = new ArrayList(); public DisplayPanel() { setSize(800, 640); refresh(); } public void refresh() { revalidate(); repaint(); } @Override public void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2d = (Graphics2D) g; g2d.clearRect(0, 0, 800, 640); for(int i = 0; i < images.size(); i++) g2d.drawImage( images.get(i).getImage(), images.get(i).getX(), images.get(i).getY(), null); } public void paintImage(ImageMap[] images, ImageMap[] clearImages, boolean clear) { if(clear) this.images.clear(); else if(clearImages!=null) for(int i = 0; i < clearImages.length; i++) this.images.remove(clearImages[i]); if(images!=null) for(int i = 0; i<images.length; i++) this.images.add(images[i]); refresh(); } }

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  • Sending SMS using Java ME application

    - by iamrohitbanga
    I want to a Java ME application that transfers any SMS received to a PC using bluetooth. The PC can then direct the Java ME application via bluetooth to send a response SMS. Is there library available for this architecture or I have to design it myself? Is this approach correct or a better one exists? I want to use bluetooth as then I will not have dependency on the cable.

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  • C# delegate to Java conversion

    - by Derek
    I am in the process of converting some code from C# to Java. I have never used C# before, but it has been pretty easy up to this point. I have a line that looks like this in the C# file: coverage.createMethod = delegate (Gridpoint gp){ //Some method stuff in here, with a return objecct } What exactly is this trying to do? It seems a little bit like an inline class but I am not sure how to go about converting htis to java

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  • Java Save Object to File

    - by Kristian Matthews
    I've tried implementing various methods from around the internet, all seem to be providing the same solution. But it just won't work and I'm unsure why, it creates the file, however, it's blank and if I try loading that file, it has an error. Main.java contains the code to save and load the file: 190-224. Rooms.java contains the object. Code Any help is greatly appreciated, I've been trying for almost a week now! Thanks in advanced!

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  • Java Serializable Object to Byte Array

    - by ikurtz
    (im new to java) from my searches for Serialization in Java most of the examples document writing to a file or reading from one. my question is lets say i have a serializable class AppMessage. I would like to transmit it as byte[] over sockets to another machine where it is rebuilt from bytes received. how could i achieve this please? thanks for your insight in advance.

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  • Calling C# code from Java?

    - by Keith G
    Does anyone have a good solution for integrating some C# code into a java application? The code is small, so I could re-write in java, but I would rather reuse the code if possible. Don't repeat yourself, etc. Also, I know I can expose the C# as a web service or whatever, but it has some security/encryption stuff in there, so I would rather keep it tightly integrated if possible. Edit: It's going to be on a server-based app, so "downloading" another runtime is irrelevant.

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  • About import statement in Java

    - by user198729
    test.java: import javax.media; Which directories are javax.media searched from? I suppose those in CLASSPATH specified by javac -cp will of course be searched. But will it also search in the directory where test.java locates? And are there any other possible places that will be searched?

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  • Java 1.4 Class performance on 1.5 JVM

    - by user222164
    Switching from JVM 1.4 to 1.5 has performance benefits as per release notes. http://java.sun.com/j2se/1.5.0/docs/relnotes/features.html#performance We have Java 1.4 compiled classes which are run on 1.5 JVM, will these classes suffer in performance because they were compiled using 1.4 ?

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  • How to activate and deactivate frame in java?

    - by Nitz
    hey guys I had made one application in java-swing, Now what i am getting problem is, i want to minimize my jframe when it is deactivate and then to maximize i want to activate that window. So for maximize, i want to activate any jframe using java code. So how to activate and deactivate any jframe, so that i can do something on window listeners? thanks in advance.

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  • User oriented regex library for java

    - by Maxim Veksler
    Hello, I'm looking for a library that could perform "easy" pattern matching, a kind of pattern that can be exposed via GUI to users. It should define a simple matching syntax like * matches any char and alike. In other words, I want to do glob (globbing) like sun's implemented logic http://openjdk.java.net/projects/nio/javadoc/java/nio/file/PathMatcher.html but without relation to the file system. Ideas?

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  • IndexOf method returns 0 when it should had return -1 in C# / Java

    - by jcgarciam
    A friend of mine came to me with this strange behavior which i can't explain, any insight view would be appreciated. Im running VS 2005 (C# 2.0), the following code show the behavior int rr = "test".IndexOf(""); Console.WriteLine(rr.ToString()); the above code, print "0" which clearly show it should have return -1 This also happen in Java where the following Class show the behavior: public class Test{ public static void main(String[] args){ System.out.println("Result->"+("test".indexOf(""))); } } Im running Java 1.6.0_17

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  • clear screen code in java

    - by sadia
    Can any body please tell me what code is used for clear screen in java? For example in c++ "system("CLS"); " is used just like this what code is used in java for clear screen? Please help. Thanks!

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  • Java class in DB

    - by Debuger
    Hi! Can anyone explain why was idea to store Java class in Db? What it is good for? And how to create stored procedure with Java class? Best regards!

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  • writing a scrip in java

    - by giri
    Hi I am working with telecom company.I am familiar with java programming language.But now I have a task to write a script , with linux operating systems.I have to write a script for fetching data from other computer and check some conditions. How can I do that using Java. Plz help me. Thanks.

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  • Problem with java on Windows

    - by Jack
    I had installed jdk-6u18-windows-i586 on my machine. Later on I uninstalled it and installed jdk 1.5.0_13 instead. Now when I do javac -version I get jdk 1.5.0_13 But when I do java -version I get java version "1.6.0_19" How do I fix this?

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  • How to call Java method from C++

    - by fhucho
    Hi, I am using JNI to call my C++ function from Java. One of the C++ function's arguments is jobject thiz (as far as I know, all JNI native functions have this argument). The function takes quite long to complete and I want to report progress back to the jobject thiz Java object, so that I can show the progress to the user. How can I call jobject's methods from C++?

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