Protecting Java jar files from decompiling.

Hello,
I need to distrubute ny Java application, I know there are tools to reengineer the java class file. How to Protect my class files from exploitation.
Any suggestions.
Thanks
Shreenivasa

1. Write a no-decompile clause into the licence.
2. Make your product so expensive that no licensee will want anybody else to get one for nothing.
3. Make your product so inexpensive that it would be simpler to buy it than reverse-engineer it.
4. Bring out new versions of your product so rapidly or with such amazing new features in each release that the reverse-engineers can't keep up with you.
5. Make a proper evaluation of the forgone revenue against the cost of all this engineering, that doesn't assume you would have sold a copy to every potential pirate, or that you can actually deter every potential pirate.
In short it is a business problem. Not a technical problem.

Similar Messages

Protecting your jar file from been extracted

Please i noticed that the java jar file of a software can easily be extracted to review the class files with winrar which allows just anyone to have access to your class file and decompile to get source codes, allowing pirating of the software. How can I lock the jar file to prevent extraction of my class files.

1. why are you mocking others instead of answering the question ? some one wants to protect his jar file. the solution is simple.
2. you can use google to search, here is result :
http://stackoverflow.com/questions/1280702/protecting-java-jar-files-for-distribution
http://stackoverflow.com/questions/9633455/how-to-protect-a-jar-file-from-being-decompiled
http://www.thegeekstuff.com/2008/06/protect-your-java-code-from-reverse-engineering/
http://answers.google.com/answers/threadview/id/431511.html
http://stackoverflow.com/questions/1879061/how-to-protect-java-codes-against-decompiler
http://viralpatel.net/blogs/2009/07/protect-java-code-decompilation-using-java-obfuscator.html
http://www.coderanch.com/t/430716/java/java/Protect-class-file-not-decompile
http://stackoverflow.com/questions/7324708/are-jar-file-insecure-what-can-done-apart-from-code-obfuscation
http://stackoverflow.com/questions/3647255/how-do-i-copy-protect-my-java-application
http://www.javaworld.com/javaworld/javatips/jw-javatip22.html
http://stackoverflow.com/questions/12088/do-you-obfuscate-your-commercial-java-code
3. it is true if you can use basic methods that EJP mentioned, there would be no need for obfuscators, nor native library use.
but there are many situations that you can't do any of those methods.
4. EJP claims that he probably is the one "who have had perhaps 40 times as long as you've had to think about it."
here is the problem that made me use both obfuscation and native library :
My company released a simple java library that scanned a document (directly from scanner or camera device).
the documents were exam papers.
Use some OCR techniques to convert image to text so some other application could calculate the score using it's api.
For marketing purposes, the company needed to publish a 7-day trial version of this library.
So, as you can see I'm eager to hear what you want to suggest.

How Can I protect my swf files from decompiling / saving

I have navigated through the internet for a long time now but
could not find the solution to my problem which is "how to protect
my swf file from decompiling/saving"?
I know that it CAN BE DONE and here is an example of a file
on the internet that cannot be saved or decompiled using any
software that I have come across (ie:SOTHINK decompiler, saveflash)
http://www.3dinternet.com/video.swf
Any help? any hints ?
Thanks
Hagop

Hagop,
> I have navigated through the internet for a long time
now but
> could not find the solution to my problem which is "how
to
> protect my swf file from decompiling/saving"?
There is no way to protect your SWF from decompiling. Any
commercial
software on the market can be decompiled -- including the
Flash authoring
tool and Photoshop, for example -- which is why softare
generally ships with
an end user license agreement (EULA) that expects you to
agree not to
decompile or reverse engineer your purchase.
Most Flash content (other than RTMP requests for video, for
example) are
HTTP requests, which by nature means the content is
downloaded to your hard
drive, just like HTML documents, CSS files, JPGs, and GIFs.
Your browser
requests the files, downloads them to your hard drive, then
displays them
from your local copy.
> I know that it CAN BE DONE and here is an example of a
> file on the internet that cannot be saved or decompiled
using
> any software that I have come across
What you've seen, then, is merely the result of software
that uses
unknown (to you or to your sofware) encryption/obfuscation
algorithms. Keep
trying, and you'll eventually nail it.
At best, you can use obfuscators to temporarily deter a
certain segment
of the decompiling-inclined population.
David Stiller
Adobe Community Expert
Dev blog,
http://www.quip.net/blog/
"Luck is the residue of good design."

How to protect my jar file from being downloaded

How can i protect my jar file from being downloaded by users by accessing it through the web site.
Now everybody can just type the url www.mysite.com/applets/myApplet.jar
And download it to his computer.
I realize that anybody who really wants to download it he will get it anyway, but I want to make it harder.
thanks in advance

Your browser has to download the jar file if it's going to run the applet. That's applets work. The browser downloads the classes and then runs them locally.
I suppose if you wanted to make something to make it difficult for users to explicitly download the jar, you could set some kind of permission flag when the HTML is page is rendered, and then unset it some amount of time (10 seconds?) later, and then only let the user download the jar when the flag is set. But this would be fragile and irritating and unhelpful. It would probably break more than you'd like and not prevent download very much (it wouldn't take long to figure out what was happening), and besides nobody is ever going to try to steal your code.

Protecting the jar files from being web access

I have a jnlp file which is put under tomcat webapps folder, say (\webapps\TEST\launch.jnlp), with the jar and lib files put in the subfolder (\webapps\TEST\folder1\*.jar AND \webapps\TEST\folder1\lib\*.jar).
My question is how can i prevent user from direct access to the jar files via typing http://www.someip.com/TEST/folder1/main.jar ? I tried the following methods but it seemed not working:
1. Change the folder permisson in \webapps\TEST\*.*, but when user type the above hyperlink they can still get the jar file
2. put the jar and related files under \WEB-INF\, but now this time running the launch.jnlp, it returns an error saying that it can't access/find the WEB-INF.
Is there any method? Or should I say, when you published jnlp to web, the related jar files are forced to be accessed by everyone.

Sounds easy to me: encrypt your xml, then instead of just storing your key as plain bytes do some reversable operations on it (xor masks, reversions, whatever you like), just do them in many different points (and classes) of your code, have some parts done by methods that actually check application is running under JWS with proper codebase, scramble it all, and suddently the whole stealing operation won't be worth the effort. Obviously you should have many private (and package protected) methods, seal packages and so on. Maybe, somehow, you can even use reflection to identify calling classes (not sure, never looked for anything similar).
What else? write down some c++ code into your own dll/JNI library and make it do something too, so they'll even need to decompile the dll. If you know first execution is always online you can send another xor key and store it with persistence service or write it down to windows registry. You can keep making it harder as much as you like, even just with silly code like
Math.ceil((new GregorianCalendar.getField(Calendar.YEAR)%2000)/1000)*((int)('c'-'a'))just to retrieve the number 2. If you distribute such code through many lines and methods, once you scramble it, most people will give up.
Bye.

How to restrict the .class file from decompilation

Hi all,
i got a security problem. i need all the java class files to be most secured. is there any to restriction on the java class files from decompilation. is that possible?. pls help me out. it's very urgent
thanks in advance

You can make it harder to understand the decompiled code if you use an obfuscator. (I don't have links to any, do a google search, or search these forums, it have been discussed here previously.)
You cannot completely prevent decompilation, though. Obfuscating does not for example not mean that any passwords you have hardcoded in the source is secure.

How to call a .jar file from a java bean?

any body knows how to call a .jar file from a java bean?

Crosspost!
http://forum.java.sun.com/thread.jspa?messageID=4349619

Running a jar file from java code

Hi!
Im trying to run a jar file from my code.
I've tried Classloader, but that doesnt work because it doesnt find the images (also embedded in the 2nd jar file).
WHat I would like to do is actually RUN the 2nd jar file from the first jar file. There must be a way to do this right?
any ideas?

ok, I found some wonderful code (see below) that will try to start the jar. But it doesn't. What it does is produce the following error when my application runs...
So it's not finding the images in the jar file that I am trying to run? Strange. I checked the URL that sending, but it seems ok....
I think I will check the url again to make sure......
any ideas?
Uncaught error fetching image:
java.lang.NullPointerException
     at sun.awt.image.URLImageSource.getConnection(Unknown Source)
     at sun.awt.image.URLImageSource.getDecoder(Unknown Source)
     at sun.awt.image.InputStreamImageSource.doFetch(Unknown Source)
     at sun.awt.image.ImageFetcher.fetchloop(Unknown Source)
     at sun.awt.image.ImageFetcher.run(Unknown Source)
the code....
/* From http://java.sun.com/docs/books/tutorial/index.html */
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.net.JarURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.jar.Attributes;
* Runs a jar application from any url. Usage is 'java JarRunner url [args..]'
* where url is the url of the jar file and args is optional arguments to be
* passed to the application's main method.
public class JarRunner {
public static void main(String[] args) {
    URL url = null;
    try {
      url = new URL(args[0]);//"VideoTagger.jar");
    } catch (MalformedURLException e) {
      System.out.println("Invalid URL: ");
    // Create the class loader for the application jar file
    JarClassLoader cl = new JarClassLoader(url);
    // Get the application's main class name
    String name = null;
    try {
      name = cl.getMainClassName();
    } catch (IOException e) {
      System.err.println("I/O error while loading JAR file:");
      e.printStackTrace();
      System.exit(1);
    if (name == null) {
      fatal("Specified jar file does not contain a 'Main-Class'"
          + " manifest attribute");
    // Get arguments for the application
    String[] newArgs = new String[args.length - 1];
    System.arraycopy(args, 1, newArgs, 0, newArgs.length);
    // Invoke application's main class
    try {
      cl.invokeClass(name, newArgs);
    } catch (ClassNotFoundException e) {
      fatal("Class not found: " + name);
    } catch (NoSuchMethodException e) {
      fatal("Class does not define a 'main' method: " + name);
    } catch (InvocationTargetException e) {
      e.getTargetException().printStackTrace();
      System.exit(1);
private static void fatal(String s) {
    System.err.println(s);
    System.exit(1);
* A class loader for loading jar files, both local and remote.
class JarClassLoader extends URLClassLoader {
private URL url;
   * Creates a new JarClassLoader for the specified url.
   * @param url
   *            the url of the jar file
public JarClassLoader(URL url) {
    super(new URL[] { url });
    this.url = url;
   * Returns the name of the jar file main class, or null if no "Main-Class"
   * manifest attributes was defined.
public String getMainClassName() throws IOException {
    URL u = new URL("jar", "", url + "!/");
    JarURLConnection uc = (JarURLConnection) u.openConnection();
    Attributes attr = uc.getMainAttributes();
    return attr != null ? attr.getValue(Attributes.Name.MAIN_CLASS) : null;
   * Invokes the application in this jar file given the name of the main class
   * and an array of arguments. The class must define a static method "main"
   * which takes an array of String arguemtns and is of return type "void".
   * @param name
   *            the name of the main class
   * @param args
   *            the arguments for the application
   * @exception ClassNotFoundException
   *                if the specified class could not be found
   * @exception NoSuchMethodException
   *                if the specified class does not contain a "main" method
   * @exception InvocationTargetException
   *                if the application raised an exception
public void invokeClass(String name, String[] args)
      throws ClassNotFoundException, NoSuchMethodException,
      InvocationTargetException {
    Class c = loadClass(name);
    Method m = c.getMethod("main", new Class[] { args.getClass() });
    m.setAccessible(true);
    int mods = m.getModifiers();
    if (m.getReturnType() != void.class || !Modifier.isStatic(mods)
        || !Modifier.isPublic(mods)) {
      throw new NoSuchMethodException("main");
    try {
      m.invoke(null, new Object[] { args });
    } catch (IllegalAccessException e) {
      // This should not happen, as we have disabled access checks
}

How to make a jar file from a java file?

how to make a jar file from a java file, is there any one tht can help me thank you;

You can study this.
http://java.sun.com/docs/books/tutorial/jar/basics/index.html

Running .jar files from Java code

Hi.
I am designing a sort of platform to run some games which are saved in .jar files. Basically this platform is a menu from which the user can select the game which he/she wants to run. It also has the feature of adding new games.
Is is possible to run the .jar file from within java code?
Thanks for any help!
Krt_malta

Just list the jar in the classpath list and call the class in the jar.

MulticastSocket Multicast socket receive error: java.lang.RuntimeException: I/O error opening JAR file from file:/D:/weblogic/mycluster/server86/tmp_deployments/ejbjar-17327.jar

Hi,
          I need some help.
          Product=weblogic5.1.0
          Revision=(Release Level)=
          Problem Description=
          I am doing cluster of weblogic server, I have no problem to set up the
          cluster and to run servlet and EJB examples.
          However, on my command line for startcluster I got a lot of message as
          followed:
          Fri Aug 18 11:31:44 EDT 2000:<E> <MulticastSocket> Multicast socket receive
          error: java.lang.RuntimeException: I/O error opening JAR file from
          file:/D:/weblogic/mycluster/server86/tmp_deployments/ejbjar-17327.jar
          java.util.zip.ZipException: error in opening zip file
          at java.util.zip.ZipFile.open(Native Method)
          at java.util.zip.ZipFile.<init>(ZipFile.java, Compiled Code)
          at java.util.zip.ZipFile.<init>(ZipFile.java, Compiled Code)
          at weblogic.boot.ServerClassLoader.deploy(ServerClassLoader.java,
          Compiled Code)
          at
          weblogic.cluster.AnnotatedServiceOffer.expandClassPath(AnnotatedServiceOffer
          .java, Compiled Code)
          at
          weblogic.cluster.AnnotatedServiceOffer.readObject(AnnotatedServiceOffer.java
          , Compiled Code)
          at
          weblogic.common.internal.WLObjectInputStreamBase.readPublicSerializable(WLOb
          jectInputStreamBase.java, Compiled Co
          de)
          at
          weblogic.common.internal.WLObjectInputStreamBase.readLeftover(WLObjectInputS
          treamBase.java, Compiled Code)
          at
          weblogic.common.internal.WLObjectInputStreamBase.readObjectBody(WLObjectInpu
          tStreamBase.java, Compiled Code)
          at
          weblogic.common.internal.WLObjectInputStreamBase.readObject(WLObjectInputStr
          eamBase.java, Compiled Code)
          at
          weblogic.common.internal.WLObjectInputStreamBase.readObjectWL(WLObjectInputS
          treamBase.java, Compiled Code)
          at
          weblogic.common.internal.WLObjectInputStreamBase.readArrayList(WLObjectInput
          StreamBase.java, Compiled Code)
          at weblogic.cluster.StateDump.readObject(StateDump.java, Compiled
          Code)
          at
          weblogic.common.internal.WLObjectInputStreamBase.readPublicSerializable(WLOb
          jectInputStreamBase.java, Compiled Co
          de)
          at
          weblogic.common.internal.WLObjectInputStreamBase.readLeftover(WLObjectInputS
          treamBase.java, Compiled Code)
          at
          weblogic.common.internal.WLObjectInputStreamBase.readObjectBody(WLObjectInpu
          tStreamBase.java, Compiled Code)
          at
          weblogic.common.internal.WLObjectInputStreamBase.readObject(WLObjectInputStr
          eamBase.java, Compiled Code)
          at
          weblogic.common.internal.WLObjectInputStreamBase.readObjectWL(WLObjectInputS
          treamBase.java, Compiled Code)
          at weblogic.cluster.TMSocket.execute(TMSocket.java, Compiled Code)
          at weblogic.kernel.ExecuteThread.run(ExecuteThread.java, Compiled
          Code)
          The message freshed about every 20 seconds.
          Another question, I used a iplanet web server as a proxy server with a
          cluster of two weblogic servers pluged in, although I set
          weblogic.properties to round-robin, however, when I run a fibonacci servlet,
          it does not do the round-robin. It always go to one machine for a lot of
          times. Any idea?
          Thank you for your help.
          Tom


May i presume that your cluster is configured on a shared file system?.
          I have seen this problem only if you cluster is configured on different machines
          and if the directory structure is not identical.
          let us know..
          Kumar
          Cameron Purdy wrote:
          > First, update to SP4 (or SP5 if it is out now). Second, follow the cluster
          > instructions on setting up deployments for a cluster. The only
          > implementation that I have used is the single shared location that all the
          > servers load from.
          >
          > --
          >
          > Cameron Purdy
          > http://www.tangosol.com
          >
          > "Tom Gan" <[email protected]> wrote in message
          > news:[email protected]...
          > > Hi,
          > > I need some help.
          > >
          > > Product=weblogic5.1.0
          > > Revision=(Release Level)=
          > > Problem Description=
          > > I am doing cluster of weblogic server, I have no problem to set up the
          > > cluster and to run servlet and EJB examples.
          > > However, on my command line for startcluster I got a lot of message as
          > > followed:
          > > Fri Aug 18 11:31:44 EDT 2000:<E> <MulticastSocket> Multicast socket
          > receive
          > > error: java.lang.RuntimeException: I/O error opening JAR file from
          > > file:/D:/weblogic/mycluster/server86/tmp_deployments/ejbjar-17327.jar
          > > java.util.zip.ZipException: error in opening zip file
          > > at java.util.zip.ZipFile.open(Native Method)
          > > at java.util.zip.ZipFile.<init>(ZipFile.java, Compiled Code)
          > > at java.util.zip.ZipFile.<init>(ZipFile.java, Compiled Code)
          > > at weblogic.boot.ServerClassLoader.deploy(ServerClassLoader.java,
          > > Compiled Code)
          > > at
          > >
          > weblogic.cluster.AnnotatedServiceOffer.expandClassPath(AnnotatedServiceOffer
          > > .java, Compiled Code)
          > > at
          > >
          > weblogic.cluster.AnnotatedServiceOffer.readObject(AnnotatedServiceOffer.java
          > > , Compiled Code)
          > > at
          > >
          > weblogic.common.internal.WLObjectInputStreamBase.readPublicSerializable(WLOb
          > > jectInputStreamBase.java, Compiled Co
          > > de)
          > > at
          > >
          > weblogic.common.internal.WLObjectInputStreamBase.readLeftover(WLObjectInputS
          > > treamBase.java, Compiled Code)
          > > at
          > >
          > weblogic.common.internal.WLObjectInputStreamBase.readObjectBody(WLObjectInpu
          > > tStreamBase.java, Compiled Code)
          > > at
          > >
          > weblogic.common.internal.WLObjectInputStreamBase.readObject(WLObjectInputStr
          > > eamBase.java, Compiled Code)
          > > at
          > >
          > weblogic.common.internal.WLObjectInputStreamBase.readObjectWL(WLObjectInputS
          > > treamBase.java, Compiled Code)
          > > at
          > >
          > weblogic.common.internal.WLObjectInputStreamBase.readArrayList(WLObjectInput
          > > StreamBase.java, Compiled Code)
          > > at weblogic.cluster.StateDump.readObject(StateDump.java, Compiled
          > > Code)
          > > at
          > >
          > weblogic.common.internal.WLObjectInputStreamBase.readPublicSerializable(WLOb
          > > jectInputStreamBase.java, Compiled Co
          > > de)
          > > at
          > >
          > weblogic.common.internal.WLObjectInputStreamBase.readLeftover(WLObjectInputS
          > > treamBase.java, Compiled Code)
          > > at
          > >
          > weblogic.common.internal.WLObjectInputStreamBase.readObjectBody(WLObjectInpu
          > > tStreamBase.java, Compiled Code)
          > > at
          > >
          > weblogic.common.internal.WLObjectInputStreamBase.readObject(WLObjectInputStr
          > > eamBase.java, Compiled Code)
          > > at
          > >
          > weblogic.common.internal.WLObjectInputStreamBase.readObjectWL(WLObjectInputS
          > > treamBase.java, Compiled Code)
          > > at weblogic.cluster.TMSocket.execute(TMSocket.java, Compiled Code)
          > > at weblogic.kernel.ExecuteThread.run(ExecuteThread.java, Compiled
          > > Code)
          > >
          > > The message freshed about every 20 seconds.
          > >
          > > Another question, I used a iplanet web server as a proxy server with a
          > > cluster of two weblogic servers pluged in, although I set
          > > weblogic.properties to round-robin, however, when I run a fibonacci
          > servlet,
          > > it does not do the round-robin. It always go to one machine for a lot of
          > > times. Any idea?
          > > Thank you for your help.
          > > Tom
          > >
          > >
          > >

Multicast socket receive error: java.lang.RuntimeException: I/O error opening JAR file from file:/D:/weblogic/mycluster/server86/tmp_deployments/ejbjar-17327.jar

Hi,
I need some help.
Product=weblogic5.1.0
Revision=(Release Level)=
Problem Description=
I am doing cluster of weblogic server, I have no problem to set up the
cluster and to run servlet and EJB examples.
However, on my command line for startcluster I got a lot of message as
followed:
Fri Aug 18 11:31:44 EDT 2000:<E> <MulticastSocket> Multicast socket receive
error: java.lang.RuntimeException: I/O error ope
ning JAR file from
file:/D:/weblogic/mycluster/server86/tmp_deployments/ejbjar-17327.jar
java.util.zip.ZipException: error in opening zip file
at java.util.zip.ZipFile.open(Native Method)
at java.util.zip.ZipFile.<init>(ZipFile.java, Compiled Code)
at java.util.zip.ZipFile.<init>(ZipFile.java, Compiled Code)
at weblogic.boot.ServerClassLoader.deploy(ServerClassLoader.java,
Compiled Code)
at
weblogic.cluster.AnnotatedServiceOffer.expandClassPath(AnnotatedServiceOffer
.java, Compiled Code)
at
weblogic.cluster.AnnotatedServiceOffer.readObject(AnnotatedServiceOffer.java
, Compiled Code)
at
weblogic.common.internal.WLObjectInputStreamBase.readPublicSerializable(WLOb
jectInputStreamBase.java, Compiled Co
de)
at
weblogic.common.internal.WLObjectInputStreamBase.readLeftover(WLObjectInputS
treamBase.java, Compiled Code)
at
weblogic.common.internal.WLObjectInputStreamBase.readObjectBody(WLObjectInpu
tStreamBase.java, Compiled Code)
at
weblogic.common.internal.WLObjectInputStreamBase.readObject(WLObjectInputStr
eamBase.java, Compiled Code)
at
weblogic.common.internal.WLObjectInputStreamBase.readObjectWL(WLObjectInputS
treamBase.java, Compiled Code)
at
weblogic.common.internal.WLObjectInputStreamBase.readArrayList(WLObjectInput
StreamBase.java, Compiled Code)
at weblogic.cluster.StateDump.readObject(StateDump.java, Compiled
Code)
at
weblogic.common.internal.WLObjectInputStreamBase.readPublicSerializable(WLOb
jectInputStreamBase.java, Compiled Co
de)
at
weblogic.common.internal.WLObjectInputStreamBase.readLeftover(WLObjectInputS
treamBase.java, Compiled Code)
at
weblogic.common.internal.WLObjectInputStreamBase.readObjectBody(WLObjectInpu
tStreamBase.java, Compiled Code)
at
weblogic.common.internal.WLObjectInputStreamBase.readObject(WLObjectInputStr
eamBase.java, Compiled Code)
at
weblogic.common.internal.WLObjectInputStreamBase.readObjectWL(WLObjectInputS
treamBase.java, Compiled Code)
at weblogic.cluster.TMSocket.execute(TMSocket.java, Compiled Code)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java, Compiled
Code)
The message freshed about every 20 seconds.
Another question, I used a iplanet web server as a proxy server with a
cluster of two weblogic servers pluged in, although I set
weblogic.properties to round-robin, however, when I run a fibonacci servlet,
it does not do the round-robin. It always go to one machine for a lot of
times. Any idea?
Thank you for your help.
Tom

Hi,
I need some help.
Product=weblogic5.1.0
Revision=(Release Level)=
Problem Description=
I am doing cluster of weblogic server, I have no problem to set up the
cluster and to run servlet and EJB examples.
However, on my command line for startcluster I got a lot of message as
followed:
Fri Aug 18 11:31:44 EDT 2000:<E> <MulticastSocket> Multicast socket receive
error: java.lang.RuntimeException: I/O error ope
ning JAR file from
file:/D:/weblogic/mycluster/server86/tmp_deployments/ejbjar-17327.jar
java.util.zip.ZipException: error in opening zip file
at java.util.zip.ZipFile.open(Native Method)
at java.util.zip.ZipFile.<init>(ZipFile.java, Compiled Code)
at java.util.zip.ZipFile.<init>(ZipFile.java, Compiled Code)
at weblogic.boot.ServerClassLoader.deploy(ServerClassLoader.java,
Compiled Code)
at
weblogic.cluster.AnnotatedServiceOffer.expandClassPath(AnnotatedServiceOffer
.java, Compiled Code)
at
weblogic.cluster.AnnotatedServiceOffer.readObject(AnnotatedServiceOffer.java
, Compiled Code)
at
weblogic.common.internal.WLObjectInputStreamBase.readPublicSerializable(WLOb
jectInputStreamBase.java, Compiled Co
de)
at
weblogic.common.internal.WLObjectInputStreamBase.readLeftover(WLObjectInputS
treamBase.java, Compiled Code)
at
weblogic.common.internal.WLObjectInputStreamBase.readObjectBody(WLObjectInpu
tStreamBase.java, Compiled Code)
at
weblogic.common.internal.WLObjectInputStreamBase.readObject(WLObjectInputStr
eamBase.java, Compiled Code)
at
weblogic.common.internal.WLObjectInputStreamBase.readObjectWL(WLObjectInputS
treamBase.java, Compiled Code)
at
weblogic.common.internal.WLObjectInputStreamBase.readArrayList(WLObjectInput
StreamBase.java, Compiled Code)
at weblogic.cluster.StateDump.readObject(StateDump.java, Compiled
Code)
at
weblogic.common.internal.WLObjectInputStreamBase.readPublicSerializable(WLOb
jectInputStreamBase.java, Compiled Co
de)
at
weblogic.common.internal.WLObjectInputStreamBase.readLeftover(WLObjectInputS
treamBase.java, Compiled Code)
at
weblogic.common.internal.WLObjectInputStreamBase.readObjectBody(WLObjectInpu
tStreamBase.java, Compiled Code)
at
weblogic.common.internal.WLObjectInputStreamBase.readObject(WLObjectInputStr
eamBase.java, Compiled Code)
at
weblogic.common.internal.WLObjectInputStreamBase.readObjectWL(WLObjectInputS
treamBase.java, Compiled Code)
at weblogic.cluster.TMSocket.execute(TMSocket.java, Compiled Code)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java, Compiled
Code)
The message freshed about every 20 seconds.
Another question, I used a iplanet web server as a proxy server with a
cluster of two weblogic servers pluged in, although I set
weblogic.properties to round-robin, however, when I run a fibonacci servlet,
it does not do the round-robin. It always go to one machine for a lot of
times. Any idea?
Thank you for your help.
Tom

Possible to create a JAR file from within a java app?

Is it possible to create a jar file from within a java application?
Can it be done more elegantly than by spawning-off another
process with the Runtime and exec() portions of the api?
Thanks
Scott

Thanks! I was mislead by the API notes for java.util.jar:
The JarOutputStream class is used to write the contents
of a JAR file to any output stream.
I was looking for a class or method to make jar files.
Seems this is it ;)
Thanks
Scott

How to Transfer a JAR file from PC to a Java enabbled mobile?

The project (creation of the JAR file) is developed in our local PC and transfer the JAR file to a mobile using Bluetooth. How to transfer the JAR file to a remote mobile?

The situation is like this.
We are transfering the JAR file from the PC to the Mobile using Bluetooth.
Our J2ME project is already install on Nokia's 6600 and given to the salesman's on the field. Now i have updated my software and i want to upgrade the same on their mobiles. For this i can't call all the 2000 salesman's who are all over the country (India) to my place to get the latest software installed and configure.
If i have a GPRS like solution for transfering my file from my PC to the remote mobile. I would be better. If you know any this related to this kindly reply me.

Can't run JavaFX app as a jar file from command line

I'm trying to build a JavaFX app from scratch (that is, by including the jar file from the JavaFX SDK rather than by using the special JavaFX project type from NetBeans). It runs fine in NetBeans. However, when I try to launch it as a jar file from the command line (using "java -jar dist\TestApp") I get the following. Has anybody seen this before, and if so how can I fix it?:
*** Fallback to Prism SW pipeline
Exception in thread "main" java.lang.RuntimeException: java.lang.UnsatisfiedLink
Error: Can't load library: C:\dev\TestApp\dist\bin\mat.dll
at com.sun.javafx.tk.quantum.QuantumToolkit.startup(QuantumToolkit.java:
289)
at com.sun.javafx.application.PlatformImpl.startup(PlatformImpl.java:68)
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherIm
pl.java:145)
at com.sun.javafx.application.LauncherImpl.access$000(LauncherImpl.java:
27)
at com.sun.javafx.application.LauncherImpl$1.run(LauncherImpl.java:97)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.UnsatisfiedLinkError: Can't load library: C:\dev\RedactionT
oolPrototype\RedactionToolPrototype.Core\dist\bin\mat.dll
at java.lang.ClassLoader.loadLibrary(Unknown Source)
at java.lang.Runtime.load0(Unknown Source)
at java.lang.System.load(Unknown Source)
at com.sun.glass.utils.NativeLibLoader.loadLibraryFullPath(NativeLibLoad
er.java:155)
at com.sun.glass.utils.NativeLibLoader.loadLibraryInternal(NativeLibLoad
er.java:85)
at com.sun.glass.utils.NativeLibLoader.loadLibrary(NativeLibLoader.java:
30)
at com.sun.glass.ui.Application$1.run(Application.java:28)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.glass.ui.Application.loadNativeLibrary(Application.java:26)
at com.sun.glass.ui.win.WinApplication.<clinit>(WinApplication.java:33)
at com.sun.glass.ui.win.WinPlatformFactory.createApplication(WinPlatform
Factory.java:20)
at com.sun.glass.ui.win.WinPlatformFactory.createApplication(WinPlatform
Factory.java:17)
at com.sun.glass.ui.Application.Run(Application.java:51)
at com.sun.javafx.tk.quantum.QuantumToolkit.startup(QuantumToolkit.java:
279)
... 5 more

Unsatisfied link means that Java is trying to access a native library, but it cannot be found. As to why this error is being thrown, here is my guess:
If you open up one of the sample jars with a zip viewer, you will see that the Manifest file has the following entries:
>
Manifest-Version: 1.0
JavaFX-Version: 2.0
implementation-vendor: Oracle
implementation-title: BrickBreaker
implementation-version: 1.0
JavaFX-Application-Class: brickbreaker.Main
Created-By: JavaFX Packager
Main-Class: com/javafx/main/Main
>
In other words, a JavaFX project works a bit differently than a normal Java project. com/javafx/main/Main is used as the Main class and your "Main" class is called later.
If you are trying to build this from a normal Java project, then com/javafx/main/Main will not be created and it will call your Main class right away. Thus, whatever setup is needed to run JavaFX will not occur.

Protecting Java jar files from decompiling.

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