@Nullable
    String jarRoot() {
        return jarRoot;
    }
Returns the path to the root directory of a web application inside a JAR/WAR. {@code null} will be
returned if {@link #docBase()} does not refer to a JAR/WAR file.
tomcat10/src/main/java/com/linecorp/armeria/server/tomcat/TomcatServiceConfig.java