I created a executable jar of my Java project I tested the jar and it is working as expected in windows but when i try run the same jar in Unix..
java jar my.jar
..it is throwing me the error below:
Exception in thread "main" java.lang.NoClassDefFoundError: jar
Caused by: java.lang.ClassNotFoundException: jar
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
How to overcome the above error?
It should be
java -jar my.jar
not the
java jar my.jar
See
java - the Java application launcher
In a runnable jar file , there will be a MANIFEST.MF inside the META-INF folder. Inside MANIFEST.MF there should be an entry Main-Class: com.myapp.MyMainClass . This will be created automatically if you using the jar command to make a runnable jar file.To be sure,unjar the jar and see if this entry is present.
Related
I made a java class using the library Jaudiotagger, and it runs without problems. I then made a jar out of it and I got NoClassDefFoundError. Here's how it went:
I put the main class id3tag.java and the library jaudiotagger-2.0.3.jar in a folder and compiled using the command line. The program ran smoothly without problems.
javac -cp .;jaudiotagger-2.0.3.jar id3tag.java
java -cp .;jaudiotagger-2.0.3.jar id3tag
I then created the manifest and the jar file.
echo Main-Class: id3tag >manifest.txt
jar cvfm id3tag.jar manifest.txt id3tag.class jaudiotagger-2.0.3.jar
I got the following output:
added manifest
adding: id3tag.class(in = 5952) (out= 2997)(deflated 49%)
adding: jaudiotagger-2.0.3.jar(in = 811441) (out= 740599)(deflated 8%)
I then ran the jar file, and got "A Java Exception has occurred.". I also tried:
java -jar id3tag.jar
And I got the output:
Exception in thread "main" java.lang.NoClassDefFoundError: org/jaudiotagger/tag/
FieldDataInvalidException
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2451)
at java.lang.Class.getMethod0(Class.java:2694)
at java.lang.Class.getMethod(Class.java:1622)
at sun.launcher.LauncherHelper.getMainMethod(LauncherHelper.java:494)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:486)
Caused by: java.lang.ClassNotFoundException: org.jaudiotagger.tag.FieldDataInval
idException
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
... 6 more
I then replaced all (both) error classes used from Jaudiotagger with Exception and recreated the jar. Now the same thing happens as for seemingly all other jar files when I run them (with Java(TM) Platform SE binary, or through writing id3tag.jar in the command prompt) - nothing. java -jar, however, works and gave me a runtime error.
Exception in thread "main" java.lang.NoClassDefFoundError: org/jaudiotagger/audi
o/AudioFileIO
at id3tag.tagSong(id3tag.java:112)
at id3tag.tagAlbum(id3tag.java:82)
at id3tag.tagArtist(id3tag.java:40)
at id3tag.main(id3tag.java:170)
Caused by: java.lang.ClassNotFoundException: org.jaudiotagger.audio.AudioFileIO
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
... 4 more
It seems like the entire library just doesn't do shit for me. How do I fix this, and how do I get jar files to run without java -jar? (Also, how do I get the full pile'o'errors in case someone needs it, rather than just having it say "x more"?)
I'm not very savvy with this kinda shit so the more specific the answer, the better. Thanks.
I'm on windows 8 and latest java (1.7.0_17).
this is informing you that you have no main class, as you might or might not already know all programs in almost all non web based programming languages must have a main class to start from. In java it looks like this
public static int main(String[] args){
}
The message is informing you that this class is no longer there, this could be a compiler error or something entirely different.
please try downloading the library again, and downloading eclipse ide for java ee developers.
this ide has a built in compiler that will work better than a command line sometimes.
i hope this helped.
I worked around it by including the org folder from jaudiotagger in my .jar instead of the actual .jar file, and I then used a .bat file to run it instead of running the .jar directly. Feel free to add your own answer if you find a better solution, and I'll check back.
I extracted jaudiotagger-2.0.3.jar with winrar so that the org folder was in the same folder as my main class. Then I could compile and run the main class simply by:
javac id3tag.java
java id3tag
I then created the manifest file the same way as before, and created the jar:
jar cvfm id3tag.jar manifest.txt id3tag.class org
The jar file worked with java -jar id3tag.jar, but simply writing id3tag.jar still did nothing. Turns out it's because jar files are by default run by the javaw.exe file, so you have to right click the jar file -> open with -> choose default program and navigate to the java.exe file in your java folder (just search the folder). Running the .jar then gets you "Error: Could not find or load main class path\id3tag.jar". I worked around this by using a .bat file. I entered
java -jar path\id3tag.jar
into Notepad and saved as whatevername.bat (save as type: all files).
I created a new question for getting the .jar file to work properly. See .jar error - could not find or load main class.
I am trying to run a java project from the command line in linux, my project uses two external jar files. The command that i am givin is
java -classpath -jar bin:common-cli-1.2.jar:BuildFrameworkLibrary.jar com.kpit.goa.common.tools.kivibuild.KIVIBuild
where KIVIBuild is the class that contains the main function. But the error that am getting is:
baibhav#baibhav:~/git/KiviBuild/Infra/RepoManagement/BuildManagement/KIVIBuild$ java -classpath bin:common-cli-1.2.jar:BuildFrameworkLibrary.jar com.kpit.goa.common.tools.kivibuild.KIVIBuild
Gives
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/cli/ParseException
Caused by: java.lang.ClassNotFoundException: org.apache.commons.cli.ParseException
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
Could not find the main class: com.kpit.goa.common.tools.kivibuild.KIVIBuild. Program will exit.
You need a path separator e.g.
bin/common-cli-1.2.jar:BuildFrameworkLibrary.jar
The colon separates paths to individual jar files. e.g. in the above you're referencing the two files
bin/common-cli-1.2.jar
BuildFrameworkLibrary.jar
and also reference the directory containing your compiled classes e.g. if they're in (say) target/classes then use:
target/classes:bin/common-cli-1.2.jar:BuildFrameworkLibrary.jar
(relative to your current working directory)
Use following command
javac -classpath bin/common-cli-1.2.jar:bin/BuildFrameworkLibrary.jar KIVIBuild.java -d .
Do not forget to add dot at the end of command
check is /com/kpit/goa/common/tools/kivibuild/KIVIBuild.class exist or not
if yes run the following command
java -classpath bin/common-cli-1.2.jar:bin/BuildFrameworkLibrary.jar com/kpit/goa/common/tools/kivibuild/KIVIBuild
http://www.linuxheadquarters.com/howto/classpath.shtml
Rather than setting class path every time set it onces in existing classpath variable and just run the java command
So when exporting the project as a runnable jar, the jar works fine on the current machine.
Moving the jar to another machine, and it cannot find the main class:
Used cmd to get the error:
Desktop>java -jar RunMe.jar
Exception in thread "main" java.lang.ExceptionInInitializerError
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader.main(JarRsrcLoa
der.java:56)
Caused by: java.lang.ArrayIndexOutOfBoundsException: 500
at pnl_user.readFile(pnl_user.java:667)
at pnl_user.readTNS(pnl_user.java:432)
at pnl_user.<init>(pnl_user.java:412)
at main.<clinit>(main.java:9)
... 3 more
To run a JAR file use java -jar thejarfile.jar.
java runme would try to run the class runme from the current classpath (which is probably not set up to point to your application).
Is this runme the jar name or main class in the jar?
To launch your app from a jar, you can do the below:
java -jar runme.jar
I am currently trying to make a Jar with all my libraries included. What I have done, I have created folders like this :
eancopy (which contain all my classes)
lib (containing all my libraries : mongo, jedis...)
META-INF/MANIFEST.MF
My main class is named process (within the package eancopy)
My manifest is like this:
Manifest-Version: 1.0
Ant-Version: Apache Ant 1.8.2
Class-Path: lib\commons-pool-1.5.6.jar lib\jedis-2.0.0.jar lib\mongo-2.6.3.jar
Created-By: 1.6.0_24-b07 (Sun Microsystems Inc.)
Main-Class: eancopy.process
I have generated the JAR with this command :
jar cvmf META-INF/MANIFEST.MF EANcopy.jar eancopy/*.class lib/*.jar
My problem : When executing the JAR by java -jar EANcopy.jar, it works when it is executed in the place where I have generated the JAR but in another place I have the message :
Exception in thread "main" java.lang.NoClassDefFoundError: com/mongodb/DBObject
Caused by: java.lang.ClassNotFoundException: com.mongodb.DBObject
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
Could not find the main class: eancopy.process. Program will exit.
Any ideas ? Thanks
This exception shows you the cause of the problem:
Exception in thread "main" java.lang.NoClassDefFoundError: com/mongodb/DBObject
You haven't specified these libs lib\commons-pool-1.5.6.jar lib\jedis-2.0.0.jar lib\mongo-2.6.3.jar in your CLASSPATH environment variable, hence why it fails when run in other places.
I have created my jar file in the following folder:
/usr/local/bin/niidle.jar
And I have one jarfile which is in the following folder
/Projects/EnwelibDatedOct13/Niidle/lib/hector-0.6.0-17.jar
And this file 'hector-0.6.0-17.jar' I have to include in MANIFEST.MF in jar.
And when I mention class path in MANIFEST.MF as follows:
Manifest-Version: 1.0
Main-Class: com.ensarm.niidle.web.scraper.NiidleScrapeManager
Class-Path: /Projects/EnwelibDatedOct13/Niidle/lib/hector-0.6.0-17.jar
When I run this using command:
java -jar /usr/local/bin/niidle.jar
It works properly..
But I dont want to give full Class-Path name, I have to give Class-Path as follows:
Manifest-Version: 1.0
Main-Class: com.ensarm.niidle.web.scraper.NiidleScrapeManager
Class-Path: lib/hector-0.6.0-17.jar
And when I run this using command:
java -jar /usr/local/bin/niidle.jar
It is showing error message:
Exception in thread "main" java.lang.NoClassDefFoundError: me/prettyprint/hector/api/Serializer
at com.ensarm.niidle.web.scraper.NiidleScrapeManager.main(NiidleScrapeManager.java:21)
Caused by: java.lang.ClassNotFoundException: me.prettyprint.hector.api.Serializer
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
... 1 more
Please tell me solution for that...
I see at least two solutions:
store hector-0.6.0-17.jar inside niidle.jar and use a relative path in Class-Path. E.g. Class-Path: lib/hector-0.6.0-17.jar (for niidle.jar/lib/hector-0.6.0-17.jar)
java -cp /Projects/EnwelibDatedOct13/Niidle/lib/hector-0.6.0-17.jar -jar /usr/local/bin/niidle.jar
Create a lib folder in the folder where you are running the command, put hector-0.6.0-17.jar in it and try running the command again.