Extracting files from executable jars at runtime

I'm still pretty new to Java, and I'm trying to find out how (if it's possible) to access files inside jars at runtime. More to the point, I am trying to make a help file for my application, stored as a .txt file. Currently I have the text file in the same directory as the source code, and I am bundling the source directory into an executable jar. However, when the jar is executed, it cannot find the file. There's got to be some mechanism for automatically loading files that are in the source directory. This issue is confused by the fact that I am using Windows XP, and so the default home directory to execute from is the My Programs directory. Any help would be appreciated!

[url http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.html]Class.[url http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.html#getResourceAsStream(java.lang.String)]getResourceAsStream(java.lang.String) is what ye want.
InputStream is = class.getResourceAsStream("myhelpfile.txt"); will get a file in the folder as your class file.
InputStream is = class.getResourceAsStream("/myhelpfile.txt"); will get a file in the root of the jar.

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How to get .class files from a JAR at runtime

Hi. I wrote a program that load the classes it find in the "prog/components" directory. It enables me to add new components without messing with the code of the main program. Everything worked fine when wrote a batch file - but I want to create a JAR file. In the Batch file I gave the path to those files for the class loader in a loop, and it was "prog.components/" + filename[i] (I get the file names by using a FileFilter).
My question is - how can I obtain the files in the prog/component directory inside the JAR? WHen I left it as it was in the BATCH it didn't work because there wa no prog/component dir outsiede the JAR. What should I do?

Thanks man, that was really helpful! I wrote some piece of code that inserts the file names I want to an ArrayList. However, I wonder how you would make the program list all the files in the "prog.jar/prog/components/" directory? I think your code would be better tahn mine since you've coped with it before. Could you write the code snippet?

Extracting certain files from a jar

I am creating a jar that when d-clicked on will extract its files to the computer the jar resides on. Here is my question: how do I get it to only extract certain files(ie. all files except the classes used to give the extraction command upon d-clicking and the manifest)?
Thanks!!

The following post won't solve the doubl clicking problem, but it will get you started on getting specific files from a Jar.
Go to:
http://forums.java.sun.com/thread.jsp?forum=22&thread=138514

Executing .jar files from another .jar file.

How would I run one .jar file from another .jar file. and is there anyway to call specific class arguments? Because I have one .jar file that reads a specified file and returns its contents.
So how would I execute it and specify its arguments and how would I make it return something to the executing jar file?

Because I have one .jar file that reads
a specified file and returns its contents. Presumably you have a class that does that, and you have that class stored in a jar. And you want to know how to... um... do something with that class. I say "um..." because normally you don't execute a class, either, you either call its static methods or you create an instance of the class and call its instance methods.
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"An error occurred while extracting files from the package "BaseSystem.pkg".

Hello!
I have a
MacBookPro5,5
Prozessortyp:Intel Core 2 Duo
Prozessorgeschwindigkeit:2.26 GHz
Anzahl der Prozessoren:1
Gesamtzahl der Kerne:2
L2-Cache:3 MB
Speicher:2 GB
Busgeschwindigkeit:1.07 GHz
Boot-ROM-Version:MBP55.00AC.B03
SMC-Version (System):1.47f2
Hardware-UUID:A2DD27C4-9829-5A4D-854B-485EF8A6B20F
Problem:
I upgraded Leopard to Snow Leopard. Everything worked fine for a month. To free up disk space I deleted some of the iPhoto flders (modfied and original images). Everything worked still fine. Shut down the computer. Next day it was incredibly slow. At the same time the indexing was running. I stopped indexing, but stll slow. Every operation took minutes. I tried all the tricks that I found in the internet (repaired file permissions, repaired disk, cleared PRAM , moved big filed from desktop, etc.). After 24 full hours of trying all this I decided to erase the hard drive and reinstall, directly from the Snow Leopard Install disk, but it fails after downloading the packages. Below is the part of the log. Then I tried to use the old Leopard install DVD to reinstall Leopard, it then sais estimated time 12 hours or so and eventually crashed, spitting out a lot of "reportcrash" in the log. What is going on? I'm running out of options. Any advice? Would zeroing the hard drive help? If nothing else I plan to buy a new hard drive, since the only explanation I have is that there is a problem with the hard driven although the disk utility says it is OK. I need a bigger one anyway. Any ideas? Thank you!
Aug 16 05:17:31 localhost OSInstaller[139]: IFPKInstallElement (191 packages)
Aug 16 05:17:35 localhost OSInstaller[139]: PackageKit: ----- Begin install -----
Aug 16 05:17:35 localhost OSInstaller[139]: PackageKit: request=PKInstallRequest <191 packages, destination=/Volumes/Macintosh HD>
Aug 16 05:17:36 localhost OSInstaller[139]: PackageKit: Extracting /Volumes/Macintosh HD/Mac OS X Install Data/BaseSystem.pkg (destination=/Volumes/Macintosh HD/.OSInstallSandbox-tmp/Root, uid=0)
Aug 16 05:31:59 localhost Unknown[80]: /SourceCache/AppleFSCompression/AppleFSCompression-24.0.1/Common/DataPool.c:116 : Error: finished pool without filling it
Aug 16 05:31:59 localhost Unknown[80]: /SourceCache/AppleFSCompression/AppleFSCompression-24.0.1/Common/commonUtils.c: 315: Error: fh_pread -1
Aug 16 05:31:59 localhost Unknown[80]: /SourceCache/AppleFSCompression/AppleFSCompression-24.0.1/Common/StreamCompress or.c:236: Error: write failed for /Volumes/Macintosh HD/.OSInstallSandbox-tmp/Root//System/Library/Frameworks/OpenCL.framework/Versi ons/A/Resources/runtime.amdil.bc: Invalid argument
Aug 16 05:31:59 localhost Unknown[80]: /SourceCache/AppleFSCompression/AppleFSCompression-24.0.1/Common/StreamCompress or.c:260: Error: futimes failed for /Volumes/Macintosh HD/.OSInstallSandbox-tmp/Root//System/Library/Frameworks/OpenCL.framework/Versi ons/A/Resources/runtime.amdil.bc: Invalid argument
Aug 16 05:31:59 localhost Unknown[80]: /SourceCache/AppleFSCompression/AppleFSCompression-24.0.1/Common/StreamCompress or.c:829: Error: returning errno 22 from FinishStreamCompressorQueue
Aug 16 05:32:10 localhost OSInstaller[139]: PackageKit: Install Failed: PKG: extracting "com.apple.pkg.BaseSystem"\nError Domain=PKInstallErrorDomain Code=110 UserInfo=0x12c8366a0 "An error occurred while extracting files from the package “BaseSystem.pkg”." Underlying Error=(Error Domain=BOMCopierFatalError Code=22 UserInfo=0x12e703300 "The operation couldn’t be completed. FinishStreamCompressorQueue error") {\n NSFilePath = "/Volumes/Macintosh HD/.OSInstallSandbox-tmp/Root";\n NSLocalizedDescription = "An error occurred while extracting files from the package \U201cBaseSystem.pkg\U201d.";\n NSURL = "BaseSystem.pkg -- file://localhost/Volumes/Macintosh%20HD/Mac%20OS%20X%20Install%20Data/index.pro duct";\n NSUnderlyingError = "Error Domain=BOMCopierFatalError Code=22 UserInfo=0x12e703300 \"The operation couldn\U2019t be completed. FinishStreamCompressorQueue error\"";\n PKInstallPackageIdentifier = "com.apple.pkg.BaseSystem";\n}
Aug 16 05:32:10 localhost OSInstaller[139]: install:didFailWithError:Error Domain=PKInstallErrorDomain Code=110 UserInfo=0x12c8366a0 "An error occurred while extracting files from the package “BaseSystem.pkg”." Underlying Error=(Error Domain=BOMCopierFatalError Code=22 UserInfo=0x12e703300 "The operation couldn’t be completed. FinishStreamCompressorQueue error")
Aug 16 05:32:11 localhost OSInstaller[139]: Install failed: Die Installation ist aufgrund eines Fehlers fehlgeschlagen. Wenden Sie sich an den Hersteller der Software.
Aug 16 05:32:13 localhost OSInstaller[139]: Allowing machine sleep.
Aug 16 05:32:15 localhost OSInstaller[139]: Memory statistics for 'Installation ist fehlgeschlagen' pane:
Aug 16 05:32:15 localhost OSInstaller[139]: Physical Memory Allocation: 139 MB wired, 259 MB trapped, 397 MB active, 7 MB inactive, 1246 MB free, 1650 MB usable, 2048 MB total

It sounds to me like your Internal Hard Drive is failing.
I recommend you buy a new one, that is a good candidate for replacing the old one, but install it in an External enclosure and Install a fresh Mac OS X on it from the DVD. You can boot your Mac from any attached drive.
The new System can be used to get some work done, check your emails, and takes the pressure off resolving this immediately. You can also attempt to salvage files off the old drive if needed.
Once things seem to be working, then move the new drive inside the computer. Failures at this point may be due to bad cable, which has been a problem in some of these MacBooks.
Use security erase, write Zeroes, one pass, to re-write every block on the old drive. Any block discovered to be bad will be replaced with spares the drive holds in reserve for this purpose. If more than 10 blocks are pared on one pass, "Initialization Failed!" will be the result. Although you can try the erase again, there is some question whether you want to trust this drive with your precious data.

Extracting file from a TAR file with java.util.zip.* classes

Is there a way to extract files from a .TAR file using the java.util.zip.* classes?
I tried in some ways but I get the following error:
java.util.zip.ZipException: error in opening zip file
at java.util.zip.ZipFile.<init>(ZipFile.java127)
at java.util.zip.ZipFile.<init>(ZipFile.java92)
Thank you
Giuseppe

download the tar.jar from the above link and use the sample program below
import com.ice.tar.*;
import java.util.zip.GZIPInputStream;
import java.io.*;
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Unable to read a .gif file from a jar

I have made an application which requires some .gif images.
I packed all the classes and .gif's in a jar file.
I have used no package statement in files, all are in one folder.
While retrieving the .gif file from the jar I have used..
Image img1 = Toolkit.getDefaultToolkit().getImage(ClassLoader.getSystemResource("Lock.gif"));
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but this does not works and throws nullpointer exception.
I have also tried getClass().getResource() etc.
But none of the methods are working..
Plz. help.
Nimesh

Is the class that is loading the image contained in a package? If the resource name does not start with a forward slash, it is interpreted as relative to the package of your class(when doing getClass().getResource())

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Long Question:
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I could place the dtd files outside the jar ear file and specify the
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Vijay

Please contact the main BEA Support team [email protected]
They will need to check with product support to determine
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Regards,
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Hi,
Actually, my application needs to read two xml files , parse it, perform some operation and write
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Hi this message appears after 2 hours downloading Mavericks : an error occurred while extracting files from the package "mzps4135638417199433253.pkg"

Hi this message appears after 2 hours downloading Mavericks in App Store :
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Same with "CMD + R"
Help...

It sounds to me like your Internal Hard Drive is failing.
I recommend you buy a new one, that is a good candidate for replacing the old one, but install it in an External enclosure and Install a fresh Mac OS X on it from the DVD. You can boot your Mac from any attached drive.
The new System can be used to get some work done, check your emails, and takes the pressure off resolving this immediately. You can also attempt to salvage files off the old drive if needed.
Once things seem to be working, then move the new drive inside the computer. Failures at this point may be due to bad cable, which has been a problem in some of these MacBooks.
Use security erase, write Zeroes, one pass, to re-write every block on the old drive. Any block discovered to be bad will be replaced with spares the drive holds in reserve for this purpose. If more than 10 blocks are pared on one pass, "Initialization Failed!" will be the result. Although you can try the erase again, there is some question whether you want to trust this drive with your precious data.

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Close your question here and open here
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Tried to install OS X Yosemite on my MacBook. Got message that it could not be installed on my computer due to error while extracting files from package "Essentials.pkg". When i quit the installer as recommended it goes in a loop and gets stuck.

Tried to install OS X Yosemite on my MacBook. Got message that it could not be installed on my computer due to error while extracting files from package "Essentials.pkg". When i quit the installer as recommended it goes in a loop and gets stuck.

Hey corrafromlondon,
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How to install OS X Yosemite on your Mac - Apple Support
you can find the Yosemite installer app in your Applications folder or Launchpad.
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Hi
How can I read a text file from a Jar file?
Thanx in advance..

thanx
helloWorld it works.damn, I didn't remove it fast enough. Even if it is urgent, it is best not to mention it, telling people just makes them take longer.

To read a gif file from a jar

I have made an application which requires some .gif images.
I packed all the classes and .gif's in a jar file.
I have used no package statement in files, all are in one folder.
While retrieving the .gif file from the jar I have used..
Image img1 = Toolkit.getDefaultToolkit().getImage(ClassLoader.getSystemResource("Lock.gif"));
ImageIcon i1=new ImageIcon(img1,"No Users");
but this does not works and throws nullpointer exception.
I have also tried getClass().getResource() etc.
But none of the methods are working..
Plz. help.
Nimesh

Hi,
Use a / with the name of your gif e.g.
frame().setIconImage((new ImageIcon(getClass().getResource("/myimage.gif")).getImage()));

Extracting files from executable jars at runtime

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