{"id":896,"date":"2015-01-30T04:19:09","date_gmt":"2015-01-30T04:19:09","guid":{"rendered":"http:\/\/mooredynasty.net\/?p=896"},"modified":"2015-01-30T04:21:07","modified_gmt":"2015-01-30T04:21:07","slug":"jsp-mvc-application-via-maven","status":"publish","type":"post","link":"https:\/\/mooredynasty.net\/index.php\/2015\/01\/jsp-mvc-application-via-maven\/","title":{"rendered":"JSP MVC Application via Maven"},"content":{"rendered":"

After a quick win with the JSP version of Hello World, it seemed that a servlet-based version was only a tweak or two away. Alas, it was not to be.<\/p>\n

Coding<\/strong><\/p>\n

After using Maven to create another web project, I added a simple controller and DTO model object based on this article<\/a>. Not wanting to get involved with Spring, etc., the project required mapping in the web.xml file as well.  <\/p>\n

I also updated the web.xml file to version 2.5 of the servlet engine.<\/p>\n

A few basic language mistakes later, the code compiled.<\/p>\n

Lesson Learned<\/strong>: Unlike .NET\u2019s using<\/em> statement, the Java import <\/em>statement includes classes, not packages.<\/p>\n

Packaging<\/strong><\/p>\n

Unfortunately, Maven was unable to complete the build because of this error:<\/p>\n

\n

error: package javax.servlet does not exist<\/p>\n<\/blockquote>\n

The solution to this little ditty was only a Google away<\/a>.  Missing a dependency in Maven\u2019s POM file:<\/p>\n

\n

<dependency>
  <groupId>javax.servlet<\/groupId>
  <artifactId>javax.servlet-api<\/artifactId>
  <version>3.0.1<\/version>
  <scope>provided<\/scope>
<\/dependency><\/p>\n<\/blockquote>\n

Not sure why Maven\u2019s archetype doesn\u2019t include this dependency by default, but adding it to the POM fixed things so Maven was able to package the project into a WAR file.<\/p>\n

Deployment<\/strong><\/p>\n

Tomcat was able to unpack the WAR file without incident.<\/p>\n

Execution<\/strong><\/p>\n

Hitting the URL a .NET developer might expect:<\/p>\n

\n

http:\/\/localhost:9999\/dtoexample\/examplecontroller<\/a><\/p>\n<\/blockquote>\n

did not work.  As memory served, though, I was half-expecting it \u2013 Java, like *nix, is a prissy environment when it comes to case, so:<\/p>\n

\n

http:\/\/localhost:9999\/dtoexample\/ExampleController<\/a><\/p>\n<\/blockquote>\n

invoked my new controller action.<\/p>\n

Unfortunately, the app coughed up a run-time error:<\/p>\n

org.apache.jasper.JasperException: The absolute uri: http:\/\/java.sun.com\/jstl\/core cannot be resolved in either web.xml or the jar files deployed with this application<\/pre>\n
The Fix<\/strong><\/p>\n
More Googling lead to this Stack Overflow article<\/a> \u2013 the original poster was close and the top answer helped a lot.  Basically more missing dependencies in the POM:<\/p>\n
\n
<dependency>
\n    
  <groupId>taglibs<\/groupId><\/p>\n
  <artifactId>standard<\/artifactId><\/p>\n
  <version>1.1.2<\/version><\/p>\n
<\/dependency><\/p>\n
<dependency><\/p>\n
  <groupId>javax.servlet<\/groupId><\/p>\n
  <artifactId>jstl<\/artifactId><\/p>\n
  <version>1.2<\/version><\/p>\n
<\/dependency><\/p>\n<\/blockquote>\n
and a tweak needed to the JSP provided by Maven, which was missing the jsp<\/em> segment for version 1.2 of the jstl<\/em>:<\/p>\n
\n
<%@ taglib uri="http:\/\/java.sun.com\/jsp\/<\/u><\/strong>jstl\/core"<\/a> prefix="c" %><\/p>\n
<\/p>\n<\/blockquote>\n
After these adjustments, my little project ran, albeit with another repeat of a self-inflicted wound: Would it kill Sun to provide a real property syntax?  Come on!<\/p>\n","protected":false},"excerpt":{"rendered":"
After a quick win with the JSP version of Hello World, it seemed that a servlet-based version was only a tweak or two away. Alas, it was not to be. Coding After using Maven to create another web project, I added a simple controller and DTO model object based on … <\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[],"class_list":["post-896","post","type-post","status-publish","format-standard","hentry","category-development"],"_links":{"self":[{"href":"https:\/\/mooredynasty.net\/index.php\/wp-json\/wp\/v2\/posts\/896","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mooredynasty.net\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mooredynasty.net\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mooredynasty.net\/index.php\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/mooredynasty.net\/index.php\/wp-json\/wp\/v2\/comments?post=896"}],"version-history":[{"count":2,"href":"https:\/\/mooredynasty.net\/index.php\/wp-json\/wp\/v2\/posts\/896\/revisions"}],"predecessor-version":[{"id":898,"href":"https:\/\/mooredynasty.net\/index.php\/wp-json\/wp\/v2\/posts\/896\/revisions\/898"}],"wp:attachment":[{"href":"https:\/\/mooredynasty.net\/index.php\/wp-json\/wp\/v2\/media?parent=896"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mooredynasty.net\/index.php\/wp-json\/wp\/v2\/categories?post=896"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mooredynasty.net\/index.php\/wp-json\/wp\/v2\/tags?post=896"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}