Setting classpath for a JAR

Question

I have a standalone java project. I have performed a maven clean install. I now go into the target\classes folder via command prompt and set all the required files in classpath. Now I execute the main class. The result is being displayed.

Now I move back to target folder via command prompt and try to execute the jar file (jar file has a manifest file where the main class is defined).

Java -cp %CLASSPATH% -jar Destination-01.19-SNAPSHOT.jar

Now I get the below exception. I have also removed the classpath attribute from the statement above but still get the same exception.The required class is set in classpath variable which is the reason why I was able to run the main class without using the -jar attribute.

Exception in thread "Main Thread" java.lang.NoClassDefFoundError: org/apache/co mons/logging/LogFactory

No is not. Try printing echo %CLASSPATH% and see if the jar file containing the LogFactory class is there. — OscarRyz
– OscarRyz, Commented Jan 9, 2012 at 14:15
Thanks. It is in the classpath - did echo %CLASSPATH%:.m2\repository\commons-logging\commons-logging \1.1\commons-logging-1.1.jar;.m2\repository\log4j\log4j\1.2.14\l og4j-1.2.14.jar; If it is not in the classpath , then I guess the stand alone main class should also not get executed. — Punter Vicky
– Punter Vicky, Commented Jan 9, 2012 at 14:18
Thanks Jake and Ring Bearer. I will try it out - I am using Maven. Wouldn't the jar take anything that is set outside? — Punter Vicky
– Punter Vicky, Commented Jan 9, 2012 at 14:20

Thorbjørn Ravn Andersen · Accepted Answer · 2012-01-09 14:28:02Z

4

When you use -jar this is the sole mechanism setting the classpath for the program.

You must either have all the jars you need listed in the Class-Path line in the manifest (which implies they need to be findable in the local file system) or create a custom class loader capable of locating the jar you need.

answered Jan 9, 2012 at 14:28

Thorbjørn Ravn Andersen

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Peter Jamieson · Accepted Answer · 2012-01-09 14:25:11Z

4

It seems -cp and -jar are incompatible. You need to put the classpath in the manifest

See http://docs.oracle.com/javase/tutorial/deployment/jar/downman.html

If you want maven to automatically update the classpath, see: -

http://maven.apache.org/shared/maven-archiver/examples/classpath.html

edited Jan 9, 2012 at 14:25

answered Jan 9, 2012 at 14:13

Peter Jamieson

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1 Comment

Punter Vicky Over a year ago

Thanks Peter! I have set one dependency in <systemPath> - but this not getting added to classpath in manifest.

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