I made a .jar file using NetBeans. When I move it to any place on my laptop and double click it, it will work. When I try it on a different PC, it gives me a message box saying:
title: Java Virtual Machine Launcher.
text: A Java Exception has occurred.
Every PC i tried so far, gives me this. Those PCs do not have any additional Java software installed, only the basic one which updates itself automatically. If there is a way to share my Java file on different PCs, please tell me (even if this involves converting the file to some other format, but not that the user has to install anything extra).
Here is my error:
If in the PC where the program was created works, but in any other one fails, it seems it's a problem with some resource. Maybe you used an absolute path to find a resource file but that file is not in the jar. I think it works because the file can be found in your PC, but not in anyone else.
How about creating a bat file and setting java home inside it. So you could first set the home or path and then use java jar commands to execute the jar.
Used eclipse in the past fro java coding and didn't have many issues but decided to give netbeans a blast
I'm trying to create a jar file with all dependencies as one jar and yes am familiar with the java-web-start-option and also the jar actually exists in my dist folder once built.
Problem 1
All's good and well, I can launch the jar but seems not without its lib folder which contains: AbsoluteLayout.jar + beanbindings.jars. Something I will need to figure out as I go along.
I call a few batch scripts to complete differenet jobs for me in the java program e.g. one finds memory amounts and displays in a JTextArea. When I use the program within the netbeans ide all works fine.
Problem 2
When I launch the jar file thats in the dist folder it launches just fine but cannot find the batch/bash scripts at all. Below is the path I use within the program which as I mentioned works fine in the IDE and just wondering why it cant find the same path in the jar.
I assumed when I created and built like in eclipe it would make all these commands work in the existing jar in my dist folder (bin in eclipse ofc)?
String[] filepath = {"cmd.exe", "/C", "..\\Enterprise\\src\\enterprise\\batch\\memory.bat"}
Any suggestions, thanks in advance!
Just try to change your path. Just make a flag if it's in your ide then select this path, if not then use another path.
Try this link to get the application path in java.
Get the application's path
I'm learning Java and was trying to test my code on another machine but am running to the above error. I've looked at youtube videos, read forums(and SO) but still can't get this to work.
I basically wrote some code on my mac using eclipse that referenced an external jar file. I have that jar in my lib folder and have added it to my build path in Eclipse via right-click "Build Path -> Add to Build Path". The code works fine on my laptop.
But when I try to run it from a linux command line, I get the above error. I am taking the code from eclipse and copying it to a file(first_try.java) and then run this commands:
CLASSPATH=./jedis-2.0.0.jar;export CLASSPATH
javac first_try.java
java -classpath . first_try
but then I get the error: Exception in thread "main" java.lang.NoClassDefFoundError: redis/clients/jedis/Jedis I downloaded the program via wget and checked permissions and tried different variations. There was a similar question I found(out of the many related ones) that had a similar context as mine but it worked for the user to just type java filename (which is not working for me)
I am learning a bit of java code but have never been successful at running external jars. I'm wondering what I'm doing wrong and what I can do to permanently fix it(ideally I want to write code locally and then copy it and test it on another machine like this)?
Or is there a better way to deploy code that depends on third party jars to other systems?
You are building your class path env var but then you don't use the value in your java command. You need $CLASSPATH instead of the dot after -classpath
Good luck learning java, I have enjoyed using it for over 10 years now ;)
So I've been writing a simple 3D GUI application that I intended for users to use simply by double-clicking on the JAR file. I got it working perfectly before putting it into the JAR file, and I got it working perfectly IN the JAR file while running from command prompt (typing "java -jar Modeler.jar" while in the directory of the jar file). However, when I double-click it, nothing happens. It runs perfectly fine with no errors from command prompt. I know from experience that crash reports on start-up are not shown because the console doesn't appear (or it disappears too fast), but when running from the command prompt there are no crash reports. Any ideas as to why it won't work? I'm running Windows 7 Home Premium. Here are the contents of the JAR file if it helps:
Modeler.jar
|
+--*all the class files necessary*
|
+--META-INF
|
+--MANIFEST.MF
Contents of MANIFEST.MF:
Manifest-Version: 1.0
Built-By: AnonymousJohn
Class-Path: bin/j3dcore.jar bin/j3dutils.jar bin/vecmath.jar
Created-By: 1.6.0_16 (Sun Microsystems Inc.)
Main-Class: Start
EDIT: So after messing with the file associations to use java.exe instead of javaw.exe (thereby providing a window for print-outs), then modifying the startup mechanism a little to print out the current working directory, I discovered that the jar is running from "C:\Windows\system32" instead of the folder on my desktop I put it in. Go figure. However, moving the necessary outside files there doesn't help anything.
EDIT 2: I tried making another JAR file, this time with a simple JFrame with a button in it that tells you the current working directory. Press the button and it opens a (useless) JFileChooser. This worked on double-click no matter where I put it in my computer. So there must be something wrong with my JAR file. I'll start troubleshooting my program again.
EDIT 3: The problem is just what I thought it was: it's not loading libraries correctly when I double click on it. The weird part is that in my tests where I display the current path and library path, the output is exactly the same whether I run it via command prompt or via double-clicking on it. Here's the stack trace:
java.lang.UnsatisfiedLinkError: no j3dcore-d3d in java.library.path
at java.lang.ClassLoader.loadLibrary(Unknown Source)
at java.lang.Runtime.loadLibrary0(Unknown Source)
at java.lang.System.loadLibrary(Unknown Source)
at javax.media.j3d.NativePipeline$1.run(NativePipeline.java:231)
at java.security.AccessController.doPrivileged(Native Method)
at javax.media.j3d.NativePipeline.loadLibrary(NativePipeline.java:200)
at javax.media.j3d.NativePipeline.loadLibraries(NativePipeline.java:157)
at javax.media.j3d.MasterControl.loadLibraries(MasterControl.java:987)
at javax.media.j3d.VirtualUniverse<clinit>(VirtualUniverse.java:299)
at javax.media.j3d.Canvas3D.<clinit>(Canvas3D.java:3881)
at ModelPreview.<init>(ModelPreview.java:51)
at Modeler.<init>(Modeler.java:76)
at Modeler.main(Modeler.java:1227)
at Start.main(Start.java:92)
Only problem is that it IS in the library path. I specifically set it in the program. Now that I think about it that may be the problem. I set it like so (this was a method I found somewhere on the internet. I don't remember where):
//above was code to get newPath based on the Operating System.
//all this code is set in a try-catch phrase.
//reset the library path
System.setProperty("java.library.path", ".\\bin\\natives" + newPath + ";");
//make sure the ClassLoader rereads the NEW path.
Field f = ClassLoader.class.getDeclaredField("sys_paths");
f.setAccessible( true );
f.set(null, null); //ClassLoader will automatically reread the path when it sees that it is null.
EDIT FINAL: Well, after looking and relooking at my code, I discovered the problem was in some BS'ery involving the detection of 64-bit systems where it was loading the wrong dll's. Why it worked from the command-line and not via double-click I don't know and will probably never know, but it works via double-click now, so I'm happy. Sorry about the troubles.
Ok, so I was stuck on this exact issue for over a week now (it has been for a side project for which I could only devote a few hours a day).
This happened on my desktop, but for some reason wouldn't happen on the laptop.
After looking around, I found this answer and I thought I'd share it for people who are like me, found nothing useful in the accepted answer here. Credits go to anonymous Stack Overflow user, whom username I've lost in all the excitement.
As mentioned by some other answer somewhere to an seeming unrelated issue, use this little program to associate your JAR files to the 64 bit version of java:
http://johann.loefflmann.net/en/software/jarfix/index.html
Save the program somewhere and run it from command line with the parameter /64:
c://path//jarfix.exe /64
Nothing else worked for me, but this was like magic. :)
The JAR is executable from CMD. That means the JAR itself is formed correctly. Good.
The only reason to fail now is that double-click produces not a right command. Expected command, as you correctly said, is
java -jar Modeler.jar
But when you associate javaw.exe with a JAR extension, I suspect it executes
javaw Modeler.jar
It is easy to check: make a javajar.cmd file, containing the following
javaw -jar %*
and associate it with JAR. If you app starts OK, I'm right. Otherwise, sorry.
I got fed up with not being able to modify file associations in Windows 7 Control Panel and edited the registry (NOTE: it's not a bad idea at all to set a restore point before proceeding if you think there's ANY chance you may screw up)(I neither set restore point nor screwed up):
Windows Registry Editor Version 5.00
[HKEY_CLASSES_ROOT\jar_auto_file]
#=""
"EditFlags"=hex:00,00,00,00
[HKEY_CLASSES_ROOT\jar_auto_file\shell]
[HKEY_CLASSES_ROOT\jar_auto_file\shell\open]
[HKEY_CLASSES_ROOT\jar_auto_file\shell\open\command]
#="\"C:\\Program Files\\Java\\jdk1.7.0_60\\bin\\javaw.exe\" -jar \"%1\" %*"
This assumes that .jar files have (Default) value jar_auto_file. If not do this:
Windows Registry Editor Version 5.00
[HKEY_CLASSES_ROOT\.jar]
#="jar_auto_file"
p.s. One problem I found in the registry was that jarfile was associated with Netbeans, Chrome, and java.exe as well as with Applications\java.exe. I deleted that entire node (after exporting it, just so I could put it back if it was essential; it wasn't). Now there is NO jarfile in my registry and all .jar files execute as before.
This manifests itself by showing more than one file type associated with .jar files in Control Panel. You want this:
If there's more than one item shown in Recommended programs, search registry for jarfile and (export first, then) delete that node:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.jar
Prerequisite: make sure JRE(that is included in JDK) is installed.
Solution
Open regedit and navigate to Computer\HKEY_CLASSES_ROOT\jar_auto_file\shell\open\command
Add "-jar" to value data. For example, change from "C:\Program Files\Java\jdk-15.0.1\bin\java.exe" "%1" to "C:\Program Files\Java\jdk-15.0.1\bin\java.exe" "-jar" "%1"
Done
If problem still occurs, make sure you configure correct main class in project property.
Just to put my two cents in, I had this problem and it was caused by something-or-other in the manifest, I suppose. I resolved it by generating the executable JAR in a different manner:
Previous developer generated the Runnable JAR from Eclipse (right-click project -> Export... -> Runnable JAR) and this worked fine for everyone. Then I came along and generated the runnable JAR by configuring a Maven plugin ("assembly") in the pom.xml and so a classic Maven build would produce the runnable JAR.
This worked nicely for me (from cmd and by double-clicking) but not for the end-users (who could still run the tool from cmd, but not by double-clicking the JAR).
I generated the runnable JAR from Eclipse and now everyone is happy again. Not sure why the maven-generated JAR wasn't ok to run by double-clicking, but I can't be bothered to investigate further now that the job is done. Hope this half-advice helps someone.
I had same issue with .jar files after trying everything i realized that I have more than one versions of Java installed. Removing the unnecessary versions solved my issue.
May be because the .jar was confused between different versions of JRE.
Just so that the answer to the question is clear to anyone passing by, I'll put my solution here (I couldn't before because of the 8-hour rule):
Well, after looking and relooking at
my code, I discovered the problem was
in some BS'ery involving the detection
of 64-bit systems where it was loading
the wrong dll's. Why it worked from
the command-line and not via
double-click I don't know and will
probably never know, but it works via
double-click now, so I'm happy. Sorry
about the troubles.
Previously, I have no problem in running the JAR file generated by NetBeans.
However, I encountered the problem now all of a sudden. When I click on the jar, it did not launch the application as if nothing is clocked.
But, it can be run from the project. And also, the size of the Jframe for desktop Java application cannot be set from the NetBeans code also. When it runs, the size of the window different from in the designer.
Any help please.
Check your META-INF/MANIFEST.MF file. It should contain a Main-Class: attribute pointing to the class to run initially.
Failing that, what happens if you run it from the console e.g.
java -jar yourjarname.jar
That should give you a much better indication of what's going on.
try to check your JAVA_HOME environment variable, and try to right click on the jar and do open with and check what application is used to open it.
Associate jar files with java instead of javaw. Relaunch. See the error message.