DD Elemente, die Referenzen auf Resourcen oder EJB Resourcen darstellen sind: <ejb-ref>: Erzeugt einen Alias für eine Bean <resource-ref>: Referenz zu Resource Manager, geliefert werden funktionierende Connections, z.B. javax.sql.DataSource <resource-env-ref>: Referenz zu Umgebungs-Informationen, mit deren Hilfe Connections erzeugt werden können: z.B. JMS The way I think of it, for the purposes of the OCWCD exam is:…
Read More
JSTL Implicit Objects Implicit Object Type Key Value cookie Map Cookie name Cookie header Map Request header name Request header value headerValues Map Request header name String[] of request header values initParam Map Initialization parameter name Initialization parameter value param Map Request parameter name Request parameter value paramValues Map Request parameter name String[] of…
Read More
The following is the update on Servlet 3.0 security annotations: As in servlet 2.5, @DenyAll, @PermitAll, @RolesAllowed will not apply to servlets. @TransportProtected will not be added to JSR 250. The following new annotations will be added to javax.servlet.annotation: ServletSecurity HttpConstraint HttpMethodConstraint Note that @ServletSecurity is a type level annotation and the rests are used…
Read More
TOPICS Introduction to Java Servlets Describe web applications, CGI, and the role of Java Describe benefits of Java servlet technology Create a simple Java Servlet Define three-tier architecture Define Model-View-Controller (MVC) architecture Introduction to Java Server Pages Describe why Servlets are not the whole solution Describe essentials of JSPs Understand the fundamentals and reasons for…
Read More
The problem with EL and standards actions is that they have no flow control statements for example what if you wanted to loop through an array, in a scriptlet you would use a for loop but you are trying to get away from scripting, what you need is custom tags. They are as easy to…
Read More