If you are getting the error "the type javax.servlet.ServletException cannot be resolved. It is indirectly referenced from required .class files," it means that your Java project is missing a dependency on the javax.servlet package, which is required to use the ServletException class.
The ServletException class is a subclass of Exception and is thrown by the Servlet class to indicate that a servlet has encountered an error. It is typically used in Java web applications to handle errors that occur during the execution of a servlet.
To fix the error, you will need to add the javax.servlet package as a dependency to your project. This can usually be done by adding the following dependency to your pom.xml file (if you are using Maven) or by adding the javax.servlet-api library to your classpath (if you are using a different build tool or IDE):
<dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>4.0.1</version> <scope>provided</scope> </dependency>
Once you have added the dependency, you should be able to use the ServletException class in your code without encountering the error.
It's important to note that the javax.servlet package is part of the Java EE (Enterprise Edition) platform and is not included in the standard Java SE (Standard Edition) distribution. Therefore, you will need to add the dependency to your project if you want to use it.