load « class file « Java I/O Q&A





1. Java resource as file    stackoverflow.com

Is there a way in Java to construct a File instance on a resource retrieved from a jar through the classloader? My application uses some files from the jar (default) or from ...

2. How to use URLClassLoader to load a *.class file?    stackoverflow.com

I'm playing around with Reflection and I thought I'd make something which loads a class and prints the names of all fields in the class. I've made a small hello world type ...

3. Where on the file system was my java class loaded from?    stackoverflow.com

I think this is a situation every java programmer runs into if they do it long enough. Your doing some debugging and make a changes to class. When you ...

4. Loading files with ClassLoader    stackoverflow.com

This problem has been bugging me for a while. I have to load a couple files in my java app, and the only way I got working so far looks like ...

5. ClassLoader loading wrong file    stackoverflow.com

I use this code snippet to obtain a file as an input stream. The file version.txt is packaged in my app's jar, in the upper-most folder.

InputStream resource = getClass().getClassLoader().getResourceAsStream("version.txt");
This works almost ...

6. How do I load resource using Class Loader as File?    stackoverflow.com

I want to open files using the class loader. However I always get a FileNotFoundException. How do I create a new File using the URL? I don't want to open it ...

7. loading specific class files in java    stackoverflow.com

I have a directory which contains lots of class files. Some of these files begin with the name test__.class and i want to load only these class files i.e test.class in ...

8. How to load an arbitrary java .class file from the filesystem and reflect on it?    stackoverflow.com

I want to make a command-line utility that does some operations based on reflection of external class files. I would pass in a path to .class files or source files(possibly ...

9. how to debug ClassLoader not finding a file in Java    stackoverflow.com

I'm trying to integrate JavaHelp system inside my project developped using Eclipse. I have the following code extracted from an example:

private HelpSet getHelpSet(String helpsetfile) {
     ...





10. Method to dynamically load java class files    stackoverflow.com

What would be a good way to dynamically load java class files so that a program compiled into a jar can read all the class files in a directory and use ...

11. JasperReports: filling a report throws an exception "Class not found when loading object from file"    stackoverflow.com

I'm using the latest JDK and JasperReports. The reports are designed and compiled with iReport (4.02). Compiled reports are deployed to Eclipse project which is integrated with a Tomcat installation on ...

12. Load Java class file on the fly    stackoverflow.com

In one of my ongoing application I want to load java class file to the application when it runs. This particular java file is generated by the user and I don't ...

13. initialize a class loading data from file. is it a builder?    stackoverflow.com

I am a newbie in design patterns.
I want to create an instance of a class, say ClassA, and set some of its fields to the values read from a config ...

14. Classloader in Applet: Can't access files    stackoverflow.com

I have an application that uses reflection to instantiate code saved in some directory: I create a URLClassLoader that then loads the classes using the URLs provided; this works fine. I ...

15. Locate resource using classloader or File?    stackoverflow.com

I'm reading someone elses code; they have a line like so:

InputStream is = getClass().getResourceAsStream("../../../../../../file.txt");
Why would you do this instead of using File? Isn't the point of using the classloader to locate ...

16. null pointer exception while trying to load file using the File class    stackoverflow.com

I have 2 files Details.java and TestDetails.java and a data file called Details.dat Details.java

import java.util.Scanner;
import java.io.*;

public class Details {
    private String path;
    File myFile = new ...





17. Loading class file to remote machine    coderanch.com

18. Classloading, WAR file extraction    coderanch.com

I am writing an application, which needs to dynamically invoke a class packaged in a WAR file. Now, I was able to invoke classes in a JAR file without problems, but not with a WAR file. A workaround was that, extract the required classes to a Temp directory and invoke them. But when I use Runtime.exec("jar xf a.class"), it is extracting ...

19. how can load changed class files.    coderanch.com

Hi All, I am asking basic question here !!! I am working on JRun. First I will explain my problem and What want? I have bunch of class files upto 1000. Where I made change in files I have restate my JRun. It is nessecary. I want a solution which will automatically relaod the changed class files. I am working the ...

20. loading class file at runtime    coderanch.com

what are you trying to do ? when you call "new Button()" then the classloader takes care to load the "Button" class from the classpath (or uses the previously loaded "Button" class). So perhaps you want to instantiate a class which name you only know at runtime ? then have a look at java.lang.Class (e.g. the methods Class.forName() and Class.newInstance()) and ...

21. dynamically create a file & load it using Class.forName()    coderanch.com

I'm trying to dynamically create a file in the source directory. Then load the newly created code file using Class.forName(); The problem: when the file gets created, i wasn't able to see it until I do a refresh on the project. Which means that I have to relaunch the program in order to access the code file created. That's bad! Is ...

22. Class Loading from a file    coderanch.com

Hi I am trying to read a local class file and load the class object into my custom class loader Code; public Class classLoad() throws IOException { FileInputStream classObjStream = new FileInputStream(new File("D:\\softwares\\parallel\\task-manager\\bin\\com\\tm\\grid\\TaskManager.class")); int length = classObjStream.read(); byte[] by = new byte[length]; ByteArrayOutputStream byteArray = new ByteArrayOutputStream(); while(classObjStream.read(by) > 0){ byteArray.write(by); } Class class1 = defineClass("com.tm.grid.TaskManager",byteArray.toByteArray(), 0, byteArray.toByteArray().length); System.out.println(">>>>>>>>>>>>"+class1); return class1; ...

23. Well i can load Class from file, but how i save it to file?    forums.oracle.com

Where did you load the class from in the first place? Anyways, a Class object isn't the actual class bytes, any more than an instance of a class called Banana is an actual banana, so you can't just take a Class instance and get bytecode from it. But if you've loaded it from somewhere, the class bytes must be available to ...

24. Loading a class from a known file    forums.oracle.com

Well, I want that the user is active in this process.. I want to load classes in this way, bacause doing that I can remove the classes from file system. It's a way to guard my code. I want that classes are only in RAM, do you think it's a good idea? Another step it will load crypted classes..

25. Problem with Classloader.getResouce(file)    forums.oracle.com

Hi, I have following piece of code a.class.getClassLoader().getResource(config/sample.properties) sample.properties is located inside jar file When the program executes from within eclipse ide the url resolves to concatenation of application home directory & location of the properties file i.e c:/ws/app/file:c:/sample.jar!config.sample.properties How do i ensure that the url always resolves to only file:c:/sample.jar!config.sample.properties. I am not supposed to modify the code "a.class.getClassLoader().getResource(config/sample.properties)", also ...

26. Time spend on loading individual class files?    forums.oracle.com

My point is. My appilcation when run from eclipse terminates before I can connect it to JConsole. Do I manually have to make some kind of pause in my app? Edited by: fresh on Jun 18, 2009 2:33 PM Never mind, JConsole neither has the option to show time per class file. Edited by: fresh on Jun 18, 2009 2:35 PM ...

27. Problem loading .class file    forums.oracle.com

28. HELP: ClassLoader cannot find .class file    forums.oracle.com

29. ClassLoader.getSystemResource() sensitive to file extension length?!?!?    forums.oracle.com

How I happened upon this... I recently upgraded my entire project from 1.4.2 to 1.5.0_13. I hadn't tested the help portion. I found that NONE of my help files would load except for the ones that had the htm extension. The ones with the html extension would not work. Could it be some stupid eclipse project setting that's screwing it up ...

30. Loading a class from a file    forums.oracle.com

I'm trying writing a FileFilter for a JFileChooser to load a class file from the disk, but I'm not sure how I can load a class from the disk without knowing the class name. I looked into using a URLClassLoader, but I'm not sure how to get a Class object from that (I'm also checking the superclass). Is there a way ...

31. Locating a file on the disk using ClassLoader    forums.oracle.com

Hello all, How one finds a file on the disk using the ClassLoader? It is not necessarily a java class, and using an absolute path is not an option since it can reside under different roots. What is known is the file's name and its relative path to the ClassLoader. thank you, Rami

32. how to load a .class file dynamically?    forums.oracle.com

Don't know if it is relevant, but does your XYParser have a (implicit or explicit) default constructor? Or maybe the inner class doesn't have one... From Javadoc: InstantiationException - if this Class represents an abstract class, an interface, an array class, a primitive type, or void; or if the class has no nullary constructor; or if the instantiation fails for some ...

33. Use ClassLoader to load class files dynamically    forums.oracle.com

Hi, I have to do a project that receive via socket, a file class that will be stored in a file and used locally by the receiver by invoking a method of that class, everything in runtime. I've resolved partially the problem using the ClassLoader and it's work almost correctly. My solution uses an interface that is implemented by the class ...

34. Loading JAVA class file - ORA-06550    forums.oracle.com