How to Include JAR Files in Java Compilation via Command Prompt?

Including JAR Files in Java Compilation via Command Prompt

When developing Java applications that rely on external libraries, it becomes necessary to include the corresponding JAR files during compilation. Here's how to accomplish this using the command prompt:

Including JARs with "javac"

To include JAR files directly in the compilation command, use the "-cp" (classpath) option:

javac -cp ".:/home/path/mail.jar:/home/path/servlet.jar;" MyJavaFile.java

Replace the ".": (current directory) with the path to your JAR files, and separate the paths with colons. Alternatively, you can use "-classpath" instead of "-cp".

Setting the CLASSPATH Environment Variable

To avoid having to specify JAR paths every time, you can set the CLASSPATH environment variable. This stores the paths to the required JARs and classes, eliminating the need to include them individually:

Windows:

set CLASSPATH=.;/home/path/mail.jar;/home/path/servlet.jar;

Linux/macOS:

export CLASSPATH=.:/home/path/mail.jar:/home/path/servlet.jar:

Further Resources:

For more detailed information on setting the CLASSPATH environment variable, refer to the following blog:

• [How Classpath Work in Java](http://javarevisited.blogspot.com/2011/01/how-classpath-work-in-java.html)

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