Adding Classpath in Linux

How to add multiple jar files in classpath in linux

You use the -classpath argument. You can use either a relative or absolute path. What that means is you can use a path relative to your current directory, OR you can use an absolute path that starts at the root /.

Example:

bash$ java -classpath path/to/jar/file MyMainClass

In this example the main function is located in MyMainClass and would be included somewhere in the jar file.

For compiling you need to use javac

Example:

bash$ javac -classpath path/to/jar/file MyMainClass.java

You can also specify the classpath via the environment variable, follow this example:

bash$ export CLASSPATH="path/to/jar/file:path/tojar/file2"
bash$ javac MyMainClass.java

For any normally complex java project you should look for the ant script named build.xml

Set classpath permanently in Linux

You could add that export statement to the end of your bash init file ~/.bashrc, therefore it will in effect all the time.

By the way, a better setting of CLASSPATH would be

export CLASSPATH="/path/to/file":"/path/to/file2":"${CLASSPATH}"

this will also preserve the initial value of that environment variable.

How to set CLASSPATH in Linux to let java find jar file?

You have to supply the complete path after the parameter -jar. So for your example you have to call

java -jar /home/user/plantuml.jar -testdot

The $CLASSPATH is only evaluated to find additional files (classes/resources) but not the jar file defined in the command line.

Setting classPath inside Linux Script

You need to use:

export CLASSPATH=/home/praveen/lib/commons-logging-1.0.4.jar:/home/praveen/lib/log4j-1.2.8.jar

rather than:

export CLASSPATH = /home/praveen/lib/commons-logging-1.0.4.jar: /home/praveen/lib/log4j-1.2.8.jar

You can't put spaces in between the variable name and the equals sign in shell scripting.

unix java classpath cp adding

Try this one:

java -cp /path/to/jar1.jar:/path/to/jar2.jar:. com.mylib.MyMainClass

Note that you should not omit that final . in the classpath, which represent the current working directory, because using -cp would override your previous classpath setting.