I have a Java Program that references a Jar File.
The Jar File is present in the same directory as the .class File but when I try to run the program from console, I get NoClassDefFound error :-(
Alternatively it runs Ok from Eclipse.
Why ?
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2 Answers
The java program will not automatically include JAR files in its class path. You add a JAR file to its class path via the -classpath option. For example:
java -classpath .;yourJarFile.jar your.MainClass
Eclipse is automatically adding the JAR file whenever you run the program.
Note: The -classpath option expects a semicolon (;) when running on Windows and a colon (:) otherwise.
3 Comments
Geek
I guess you are right. Now if the Jar File uses any other Jar File I should add that too?
Geek
Thanks mate. Dude can you give me an example of two Jar Files. ? On a unix system.
Adam Paynter
You just separate all the JAR file names with a colon (
:) on a UNIX system: `java -classpath .:firstJarFile.jar:secondJarFile.jar your.MainClassJAR files are not automatically included in the classpath. You can add a Class-Path entry and a Main-Class entry to the to JAR file containing the main method that you wish to execute. Then you can execute your code like so:
java -jar yourJarFile.jar
See the JAR File Specification for more details.
or specify the classpath on the command line:
java -classpath lib1.jar:lib2.jar:yourJarFile.jar your.MainClass
