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Setting path for Catalina of Apache Tomcat Server

Use the following steps as below:

Step 1. set home as the screenshot:

Step2. write the above variable name and values in the System variable as below:

or see another for full screen:

Step3. Set Path as below:

Step4. set CATALINA_ HOME in System variable as below:

Finally, you have completed all necessarily setps.
 Now, open command prompt and type as follow to compile the .java file:

Since DemoServ.java and HEERA.java files are under servlet folder on the desktop.
So that we have to use change directory command and type as below:
cd desktop
cd servlet

Then follow the further steps for compilation:
C:\Program Files\Apache Software Foundation\Tomcat 9.0\lib\servlet-api.jar

Further, use command to compile with java compiler javac (which is JIT)

javac DemoServ.java
javac HEERA.java

Another Ways:

Consider the following steps:
step1. copy servlet-api.jar from C:\Program Files\Apache Software Foundation\Tomcat 9.0\lib
step2. paste into the following directory as below:
C:\Program Files\Java\jdk1.8.0_76\jre\lib\ext

Screenshot is as follow: