How to set Java classpath in Linux?

问题

I downloaded apache-log4j-1.2.16.zip and unziped it. I then renamed it as LOG4J_HOME and placed it in /home/appnetix folder which is my folder. I tried setting the classpath in the terminal using the following command :

[appnetix@Sanjeev ~]$ set classpath=%path%;LOG4J_HOME/log4j-1.2.16.jar;

That returned:

bash: LOG4J_HOME/log4j-1.2.16.jar: Permission denied

I tried doing this:

[appnetix@Sanjeev ~]$ set classpath=%path%;//home/appnetix/LOG4J_HOME/log4j-1.2.16.jar;

But I got this:

bash: //home/appnetix/LOG4J_HOME/log4j-1.2.16.jar: Permission denied

Please help, I'm new in Linux (one month).

回答1:

export CLASSPATH=/home/appnetix/LOG4J_HOME/log4j-1.2.16.jar

or, if you already have some classpath set

export CLASSPATH=$CLASSPATH:/home/appnetix/LOG4J_HOME/log4j-1.2.16.jar

and, if also you want to include current directory

export CLASSPATH=$CLASSPATH:/home/appnetix/LOG4J_HOME/log4j-1.2.16.jar:.

回答2:

You have to use ':' colon instead of ';' semicolon.

As it stands now you try to execute the jar file which has not the execute bit set, hence the Permission denied.

And the variable must be CLASSPATH not classpath.

回答3:

Can you provide some more details like which linux you are using? Are you loged in as root? On linux you have to run export CLASSPATH = %path%;LOG4J_HOME/og4j-1.2.16.jar If you want it permanent then you can add above lines in ~/.bashrc file.

来源：https://stackoverflow.com/questions/2973624/how-to-set-java-classpath-in-linux