Extracting class files of a certain package from a jar.

Hi,
I want to extract all the class files belonging to a certain package from a JAR file containing class files belonging to a different packages.
Can I do this using the jar tool, or use some other unzipping tool?
If it is best to use an unzipping tool which one can I use for windows?
Thanks,
Niranjan.

jar xf file.jar path/to/dir
For more info see http://java.sun.com/j2se/1.5.0/docs/tooldocs/windows/jar.html.

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How to dynamically enumerate classes belonging to a certain package ?
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Scan the class path for files in the target package.
There isn't a simple way to do this and generally you should need to.

How to extract .class files?

Hello,
I have four .class files I need to take a look inside, and manage the files. How may I go about doing this? I am not a programmer so I will not understand code. Is there any free app that works and extracts .class files? I have tried RAR Extractor Free and The Unarchiver, but none worked.
Please help!

Why bother? Just distribute the 3rd-party JAR as it is. All it costs you is a little disk space. Why bother to look inside, understand which classes you do and don't need, repackage, ... repeat every 3rd-party release? repeat for every 3rd-party product?
Just ship it the way they ship it.

How do I make a batch file if the .class file uses a foreign package?

I am trying to make an MS-DOS batch file using the bytecode file from the Java source file, called AddFields.java. This program uses the package BreezySwing; which is not standard with the JDK. I had to download it seperately. I will come back to this batch file later.
But first, in order to prove the concept, I created a Java file called Soap.java in JCreator. It is a very simple GUI program that uses the javax.swing package; which does come with the JDK. The JDK is currently stored in the following directory: C:\Program Files\Java\jdk1.6.0_07. I have the PATH environment variable set to the 'bin' folder of the JDK. I believe that it is important that this variable stay this way because C:\Program Files\Java\jdk1.6.0_07\bin is where the file 'java.exe' and 'javac.exe' are stored. Here is my batch file so far for Soap:
@echo off
cd \acorn
set path=C:\Program Files\Java\jdk1.6.0_07\bin
set classpath=.
java Soap
pause
Before I ran this file, I compiled Soap.java in my IDE and then ran it successfully. Then I moved the .class file to the directory C:\acorn. I put NOTHING ELSE in this folder. then I told the computer where to find the file 'java.exe' which I know is needed for execution of the .class file. I put the above text in Notepad and then saved it as Soap.bat onto my desktop. When I double click on it, the command prompt comes up in a little green box for a few seconds, and then the GUI opens and says "It Works!". Now that I know the concept of batch files, I tried creating another one that used the BreezySwing package.
After I installed my JDK, I installed BreezySwing and TerminalIO which are two foreign packages that make building code much easier. I downloaded the .zip file from Lambert and Osborne called BreezySwingAndTerminalIO.zip. I extracted the files to the 'bin' folder of my JDK. Once I did this, and set the PATH environment variable to the 'bin' folder of my JDK, all BreezySwing and TerminalIO programs that I made worked. Now I wanted to make a batch file from the program AddFields.java. It is a GUI program that imports two packages, the traditional GUI javax.swing package and the foreign package BreezySwing. The user enters two numbers in two DoubleField objects and then selects one of four buttons; one for each arithmetic operation (add, subtract, multiply, or divide). Then the program displays the solution in a third DoubleField object. This program both compiles and runs successfully in JCreator. So, next I moved the .class file from the MyProjects folder that JCreator uses to C:\acorn. I put nothing else in this folder. The file Soap.class was still in there, but I did not think it would matter. Then I created the batch file:
@echo off
cd \acorn
set path=C:\Program Files\Java\jdk1.6.0_07\bin
set classpath=.
java AddFields
pause
As you can see, it is exactly the same as the one for Soap. I made this file in Notepad and called it AddFields.bat. Upon double clicking on the file, I got this error message from command prompt:
Exception in thread "main" java.lang.NoClassDefFoundError: BreezySwing/GBFrame
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:12
4)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
Caused by: java.lang.ClassNotFoundException: BreezySwing.GBFrame
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
... 12 more
Press any key to continue . . .
I know that most of this makes no sense; but that it only means that it cannot find the class BreezySwing or GBFrame (which AddFields extends). Notice, however that it does not give an error for javax.swing. If I change the "set path..." command to anything other than the 'bin' folder of my JDK, I get this error:
'java' is not recognized as an internal or external command,
operable program or batch file.
Press any key to continue . . .
I know this means that the computer cannot find the file 'java.exe' which I believe holds all of the java.x.y.z style packages (native packages); but not BreezySwing or any other foreign packages. Remember, I do not get this error for any of the native Java packages. I decided to compare the java.x.y.z packages with BreezySwing:
I see that all of the native packages are not actually visible in the JDK's bin folder. I think that they are all stored in one of the .exe files in there because there are no .class files in the JDK's bin folder.
However, BreezySwing is different, there is no such file called "BreezySwing.exe"; there are just about 20 .class files all with names like "GBFrame.class", and "GBActionListener.class". As a last effort, I moved all of these .class files directly into the bin folder (they were originally in a seperate folder called BreezySwingAndTerminalIO). This did nothing; even with all of the files in the same folder as java.exe.
So my question is: What do I need to do to get the BreezySwing package recognized on my computer? Is there possibly a download for a file called "BreezySwing.exe" somewhere that would be similar to "java.exe" and contain all of the BreezySwing packages?

There is a lot of detail in your posts. I won't properly quote everything you put (too laborious). Instead I'll just put your words inside quotes (").
"..there are some things about the interface that I do not like."
Like +what?+ This is not a help desk, and I would appreciate you participating in this discussion by providing details of what it is about the 'interface' of webstart that you 'do not like'. They are probably misunderstandings on your part.
"Some of the .jar files I made were so dangerously corrupt, that I had to restart my computer before I could delete them."
Corrupt?! I have never once had the Java tools produce a corrupt Jar. OTOH, the 'cannot delete' problem might relate to the JRE gaining a file lock on the archive at run-time. If the file lock persisted after ending the app., it suggests that the JRE was not properly shut down. This is a bug in the code and should be fixed. Deploying as .class files will only 'hide' the problem (from casual inspection - though the Task Manager should show the orphaned 'java' process).
"I then turned to batch files for their simple structure and portability (I managed to successfully transport a java.util containing batch file from my computer to another). This was what I did:
- I created a folder called Task
- Then I copied three things into this folder: 1. The file "java.exe" from my JDK. 2. The program's .class file (Count.class). and 3. The original batch file.
- Then I moved the folder from a removable disk to the second computer's C drive (C:\Task).
- Last, I changed the code in the batch file...:"
That is the +funniest+ thing I've heard on the forums in the last 72 hours. You say that is easy?! Some points.
- editing batch files is not scalable to 100+ machines, let alone 10000+.
- The fact that Java worked on the target machine was because it was +already installed.+ Dragging the 'java.exe' onto a Windows PC which has no Java will not magically make it 'Java enabled'.
And speaking of Java on the client machine. Webstart has in-built mechanisms to ensure that the end user has the minimum required Java version to run the app. - we can also use the [deployJava.js|http://java.sun.com/javase/6/docs/technotes/guides/jweb/deployment_advice.html#deplToolkit] on the original web page, to check for minimum Java before it puts the link to download/install the app. - if the user does not have the required Java, the script should guide them through installing it.
Those nice features in deployJava.js are available to applets and apps. launched using webstart, but they are not available for (plain) Jar's or loose class files. So if 'ensuring the user has Java' is one of the requirements for your launch, you are barking up the wrong tree by deploying loose class files.
Note also that if you abandon webstart, but have your app. set up to work from a Jar, the installation process would be similar to above (though it would not need a .bat file, or editing it). This basic strategy is one way that I provide [Appleteer (as a downloadable ZIP archive)|http://pscode.org/appleteer/#download]. Though I side-step your part 1 by putting the stuff into a Jar with the path Appleteer/ - when the user expands the ZIP, the parts of the app. are already in the Appleteer directory.
Appleteer is also provided as a webstart launched application (and as an applet). Either of those are 'easier' to use than the downloadable ZIP, but I thought I would provide it in case the end user wants to save it to disk and transport the app. to a machine with no internet connection, but with Java (why they would be testing applets on a PC with no internet connection, I am not sure - but the option is there).
"I know that .jar and .exe files are out because I always get errors and I do not like their interfaces. "
What on earth are you talking about? Once the app. is on-screen, the end user would not be able to distinguish between
1) A Jar launched using a manifest.
2) A Jar launched using webstart.
3) Loose class files.
Your fixation on .bat files sounds much like the adage that 'If the only tool you have is a hammer, every job starts to look like a nail'.
Get over them, will you? +Using .bat files is not a practical way to provide a Java app. to the end user+ (and launching an app. from a .bat looks quite crappy and 'second hand' to +this+ user).
Edit 1:
The instructions for running Appleteer as a Jar are further up the page, in the [Running Appleteer: Application|http://pscode.org/appleteer/#application] section.
Edited by: AndrewThompson64 on May 19, 2009 12:06 PM

Having an AppleScript Move All Files of a Certain Type From Sub-Folders to Trash

Greetings, everyone. With my introductory post, I would like to ask for help with an AppleScript I've been slaving over for the past five hours or so. I have tried Terminal and Finder commands both, along with lots and lots of Googling, and I cannot seem to get this to work.
Specfically, I want a script to look into a folder and all of its sub-directories, locate all files with a certain extension (in this case, APP), and then send every one of those files to the trash. Originally, I planned to delete them directly with Terminal commands that required verification, but I couldn't get that to work, and I thought that this would be a more average user-friendly version, anyway.
I also wondered if there was any universal means of referring to a system drive without referring to it by its name, since (as you'll see in the script) the directory that these *.app files will be moved from is in the Users/Shared hierarchy. However, it's meant to be used on multiple computers, so naming the OS drive on one won't work for others. If no such wild card exists, is what I'm doing now (having the script placed in the root folder of the OS drive) acceptable?
As it is, when I run this script, it displays all the dialogs, but the APP files aren't moved. It doesn't error at all in the AppleScript editor, it just runs and then closes down. I don't know what I'm doing wrong.
Thank you in advance for any help you can provide.
=====
if button returned of (display dialog "Trash all of the APP files in your SuchAndSuch folder? (This script must be in the root directory of your system drive.)" buttons {"Yes, I'm ready", "No"} default button 2 cancel button 2 with title "SuchAndSuch Folder Prep" with icon caution) is "Yes, I'm ready" then
    set theFolder to ":Users:Shared:SuchAndSuch:" as alias
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        set theFiles to every file of theFolder whose name extension is "app"
        move theFiles to trash
    end tell
end if
if button returned of (display dialog "The APP files have been trashed." buttons {"OK"} default button 1 with title "SuchAndSuch Folder Prep" with icon 1) is "OK" then
end if

Well, you've done more fiddling than that; you've moved everything inside the Finder tell block. Why did you do that? If you recall my point 2 above, it is difficult to use POSIX paths or the POSIX file command inside Finder tell blocks without generating errors, but you've done both in your revision. I'm surprised that you're surprised that it doesn't work.
Applescript tries to be user-friendly, but it's still a programming language, and like any programming language the devil is in the details. Changes that seem small and innocuous to you can make big differences in the result you get.
Now:
/Users/Shared should be machine independent in POSIX: you don't need to specify the hard drive name and it should be universal on all OS X installations. You can specify it directly.
The Finder's delete command moves fils to the trash, it doesn't erase them. Trying to use the move command to get files to the trash is a little bass-ackwards.
Don't put anything inside a Finder tell block unless it has to be processed by the Finder. If you do you're just begging for errors.
There's no need to put the script at the root level of the drive. If the Finder needs permission to delete a file it will ask.
untangled and revised:
set subfolderOfSharedFolder to quoted form of "/Users/Shared/<subfolder name>"
set response to display dialog "Trash all of the APP files in your <subfolder name> folder?" buttons {"Yes, I'm ready", "No"} default button 2 cancel button 2 with title "<subfolder name> Folder Prep" with icon caution
if button returned of response is "Yes, I'm ready" then
-- run spotlight search
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-- convert posix paths to file specifiers
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                    set (contents of thisFile) to POSIX file thisFile
          end repeat
          tell application "Finder"
delete filesToDelete
          end tell
          if button returned of (display dialog "The APP files have been trashed." buttons {"OK"} default button 1 with title "SuchAndSuch Folder Prep" with icon 1) is "OK" then
          end if
end if

Where to keep the java class file which is being used from a form?

Hi,
Actually I am developing a form which has a bean area and the data will be displayed in the bean area in the form of grid. And I will register this form with apps and will run the from Oracle apps. I want to know that there is a java class file that is being refered by the form, where should this java class file be placed and is there any other places where any changes are required so that the form runs correctly from the Oracle apps and can find the java class file.
I am very thankful to each and everyone who will be able answer this question of my.

do you mean decompiling? there are tons of java decompilers available out there, what exactly are you trying to do here?

My .class files work...but when I jar it, the swing goes crazy!!

5 dukes, if anyone can get this :) :) ....
Hi, I have an application which is working perfectly when I view it using the java viewer. But when I put the whole thing into a jar.....the layout, and the swing stuff is messed up, terribly. Like Its foxused on nothing, and you have to click on where you think the button is...to make it appear, sooo strange. Here's what I have.
I put 2 panels onto desktopPane() using a GridBagLayout layout.
on panel 1, I have a whole bunch of g2d objects,
on panel 2, I have a whole bunch of Components (JButton's, JTextField's, etc..), but panel2 isn't really the problem, since when I removed panel 1, the jar ran without problems.
So It could be panel 1, or something in the main() class which sets up the panels, here is the appropriate code...
Panel 1
static class MyComponent extends JComponent {
          JScrollBar scroll;
          //          ~~~~~~~~~~~~~~Graphics Stuff~~~~~~~~~~~~~~~
          public void paintComponent(Graphics g){
          // a whole bunch of g2d things
          // ~~~~~~~~~~~~~~Component Stuff~~~~~~~~~~~~~~~
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                    setBackground(Color.pink);
                    setBounds(0,0,500,500);
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                    scroll = new JScrollBar(JScrollBar.VERTICAL,0,20,0,100);
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And the main code...
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I dont know what I did wrong, but If you can find it Ill give u 5 dukes!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Here is how it looks when its run as a .class file,
http://www.members.lycos.co.uk/markrules/morestuff/1.jpg
And it is just completely distorted when its not...
thanks, MArk

Dude, throw GridBagLayout out! Go get TableLayout or FormLayout! Seriously. Unless you are restricted to use only JDK layouts, TableLayout has been a huge time saver and life saver for me. Google it, you'll thank me a million times over, and toss me them 5 dukes. ;)

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Create an implementation of the java.io.FilenameFilter interface to match the pattern you need.
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hi,
I have a class file in a package called
pack.Test
and a class file not in a package called
Library
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%DIR%\Library.java
%DIR%\pack\Test.java
is how they are layed out.
Is there a way to get Library imported to pack.Test?
thanks,
asjf

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prior to 1.4 you could. I think the JLS has been
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RObin

Problem parsing XML with schema when extracted from a jar file

I am having a problem parsing XML with a schema, both of which are extracted from a jar file. I am using using ZipFile to get InputStream objects for the appropriate ZipEntry objects in the jar file. My XML is encrypted so I decrypt it to a temporary file. I am then attempting to parse the temporary file with the schema using DocumentBuilder.parse.
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This was all working OK before I jarred everything (i.e. when I was using standalone files, rather than InputStreams retrieved from a jar).
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I am baffled because the nature of the exception suggests that the schema has been read and parsed correctly but the XML file is not parsing against the schema.
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I was originally using getSystemResource, which worked fine until I jarred the application. The problem appears to be that resources returned from a jar file cannot be used in the same way as resources returned directly from the file system. You have to use the ZipFile class (or its JarFile subclass) to locate the ZipEntry in the jar file and then use ZipFile.getInputStream(ZipEntry) to convert this to an InputStream. I have seen example code where an InputStream is used for the JAXP_SCHEMA_SOURCE attribute but, for some reason, this did not work with the InputStream returned by ZipFile.getInputStream. Like you, I have also seen examples that use a URL but they appear to be URL's that point to a file not URL's that point to an entry in a jar file.
Maybe there is another way around this but writing to a file works and I set use File.deleteOnExit() to ensure things are tidied afterwards.

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so if you are using pacakges here is normal example...
say you .java code is something like...
package com.util;
public Class BeanUtility{
}place the .class file at WEB-INF/classes/com/util folder if those folders are missing create it and place the .class file there. or pacakage it as a jar file & put it into WEB-INF/lib folder
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I am having a problem importing that class file into my jsp(which resides in the Web Pages directory .
I tried the following:
<jsp:useBean id="dial" class="Test" scope="session" />
my class file is Test.java
Any help or explanation would be greatly appreciated.
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Will not work. Classes have to be defined in a package, the default package just wont do.
ram.

URGENT - Extract Image Files From Long Raw Column

Hi.
I have to extract image files (tif and wmf format) from "long raw" column and put them in a directory, using a PL/SQL procedure.
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Well that is interesting, that ORA returns no records on Metalink. Anyway, that was for my own curiosity.
As you are on 10g, this is how I would write a long raw to a file if I had no choice:
1) create a gtt with a column of type blob
2) insert into the gtt the long raw column using the to_lob conversion function
3) you now have a lob!
4) open a binary file for writing using utl_file (binary mode was introduced in 10g)
4) use dbms_lob to read through the blob and write it in chunks to the file
You will have to do this row by row. It will be painfully excrutiatingly slow.
This is basically your only choice unless you have a OCI programmer to hand. In which case I would be getting them to write the C code to read the long raw column and write it to a file. This could then be compiled into a library and called as an external procedure from PL/SQL.
HTH
Chris

Extracting class files of a certain package from a jar.

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