Principal p = request.getUserPrincipal() Here are 4 ways you might get around the classloader boundary: String emailAddress = p.getEmailAddress() MyPrincipal p = request.getUserPrincipal() Here\'s what you would like to do, but it throws ClassCastException: Normally, you would put custom realmĪnd principal classes in the server directory because they depend on Server/classes (or lib) directory, as well as in your webapp\'s This assumes you created a My``Principal class, and put in Tomcat\'s Otherwise exactly the same, different (sibling) classloaders makes them Of a class loaded by the server\'s classloader, and you are trying toĪccess it through you webapp\'s classloader. This is because the instance returned by request.getUserPrincipal() is Webapp code, you\'ll probably have problems with ClassCastException. RealmBase or GenericPrincipal and attempt to use those classes in your How can I access members of a custom Realm or Principal? Ans. Native Windows and Unix wrappers for platform integration Provides HTTP web server environment in order to run Java code. The implementation of Java Servlet and the Java Server Pages is performed by this container. Tomcat Servlet Container is a servlet container. Q: - Explain the concepts of Tomcat Servlet Container. Tomcat uses the system classpath, so if ShoppingCart.class is visible somewhere in the system classpath, they should see it. The JSP engine probably can't see the class in its classpath. Q: - Why do I get a ClassNotFoundException when I try to use the ShoppingCart class? But there is no way to add such properties in web.xml or the webapp's context. If you can edit Tomcat's startup scripts, you can add "-D" options to Java. Q: - Can I set Java system properties differently for each webapp? Jasper is intended for generating input into a class file browser which can produce the hierarchy of inheritance and composition maps from the. This program can generate ASCII files, which can be used along with Jasmin Assembler. You may know the types of all the variables, but the next person may not. There are plenty of times when you break this rule, especially in cases where you want a map to look like it is a bean, you want things to make sense to the next person who reads your code. If you are accessing a map value or an array index, use the operator. For example, if you are accessing a bean property, use the. and when do I use ?Īlthough you can use these operators interchangeably, it is a good idea to use an operator that indicates the kind of data being accessed. Remember, the default scope for a bean is page, and all beans with page scope disappear when the page finishes executing. You probably forgot to specify a scope for the bean. Q: - Why is a new object created whenever I call jsp:useBean? Remember, too, that if you don't give the cookie a specific expiration time, the cookie will vanish when the user shuts the browser down. Also, if you specified a root path for the cookie, make sure that the JSP or servlet reading the cookie is in that path. Next, make sure the browser has cookies enabled. Q: -I stored a cookie on the browser why can't I see it?įirst, check to make sure you spelled the cookie name correctly. In server.xml, make sure you disable tomcat authentication: Q: - How do I configure Tomcat to work with IIS and NTLM?įollow the standard instructions for when the isapi_redirector.dllĬonfigure IIS to use "integrated windows security" Tomcat can be used standalone as well as behind other web servers such as Apache httpd. Tomcat provides a good choice as a web server for many web applications and also a free Servlet and JSP engine. Tomcat is sophisticated in this respect, as it provides both Servlet and JSP technologies. In addition to the static web pages, dynamic web pages are also sent to the web browsers by the web server. A web server sends web pages as response to the requests sent by the browser client. Tomcat is a Java Servlet container and web server from Jakartha project of Apache software foundation.
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