@Override
    public String getValue() {
        if (this.applicationMainClassName == NOT_FOUND) {
            return "";
        }
        return this.applicationMainClassName;
    }
Returns the fully qualified class name of the application's main class.

@return the fully qualified class name of the main class, or an empty string if the main class cannot be resolved
agent-module/bootstraps/bootstrap-core/src/main/java/com/navercorp/pinpoint/bootstrap/resolver/condition/MainClassCondition.java