The superclass “javax.servlet.http.HttpServlet” was not found on the Java Build Path [duplicate]
Add a runtime first and select project properties. Then check the server name from the ‘Runtimes’ tab as shown in the image.
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How to solve the “failed to lazily initialize a collection of role” Hibernate exception
If you know that you’ll want to see all Comments every time you retrieve a Topic then change your field mapping for comments to: @OneToMany(fetch = FetchType.EAGER, mappedBy = “topic”, cascade = CascadeType.ALL) private Collection<Comment> comments = new LinkedHashSet<Comment>(); Collections are lazy-loaded by default, take a look at this if you want to know more.
Download a file by jQuery.Ajax
2019 modern browsers update This is the approach I’d now recommend with a few caveats: A relatively modern browser is required If the file is expected to be very large you should likely do something similar to the original approach (iframe and cookie) because some of the below operations could likely consume system memory at … Read more
How can I upload files to a server using JSP/Servlet?
Introduction To browse and select a file for upload you need a HTML <input type=”file”> field in the form. As stated in the HTML specification you have to use the POST method and the enctype attribute of the form has to be set to “multipart/form-data”. <form action=”upload” method=”post” enctype=”multipart/form-data”> <input type=”text” name=”description” /> <input type=”file” … Read more
What is the difference between JSF, Servlet and JSP?
JSP (JavaServer Pages) JSP is a Java view technology running on the server machine which allows you to write template text in client side languages (like HTML, CSS, JavaScript, ect.). JSP supports taglibs, which are backed by pieces of Java code that let you control the page flow or output dynamically. A well-known taglib is … Read more
How can I avoid Java code in JSP files, using JSP 2?
The use of scriptlets (those <% %> things) in JSP is indeed highly discouraged since the birth of taglibs (like JSTL) and EL (Expression Language, those ${} things) way back in 2001. The major disadvantages of scriptlets are: Reusability: you can’t reuse scriptlets. Replaceability: you can’t make scriptlets abstract. OO-ability: you can’t make use of … Read more