If you are getting the scala servlet tomcat error, this user guide has been written to help you.
The following is not a recommended practice for configuring Tomcat.This is for those who are new to servlet containers and want to get familiar with theirthe application is working. Setting up servlet containers can be potentially trickyAs with other web applications such as Apache Nginx, it’s up to you to help figure it out.the performance and security implications you do. We recommendthat you reviewed the documentation for the water tank servlet you chose before revealing yourselffor many on the web.
However, as you’ll soon see, the center box is extremely simple.
Tomcat paths are case sensitive. Be sure to copy your ROOT to the .war app.
The require method parameters are not parsed by the put(/:resource) API when scalatra deploys an application using a WAR in Tomcat 7. For PUT to work, set each connector attribute “parseBodyMethods” to Kater “In “post,put” – Server .xml Then the same goes for PATCH.
I have to create a fail-safe servlet using scala, but I can’t figure out how to get it to p Run under tomcat. I have reason to believe that my Scala class is fine and I have added all scala-2.6.x-final-blah.tgz libraries to the tomcat library directory. I keep getting the random generic error below.
javax.servlet.ServletException: instance allocation failed Servlet org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286) org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845) org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583) org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) java.lang.Thread.run(Thread.java:636)deeper reasonjava.lang.NoClassDefFoundError: scala/ScalaObject
On thelegal language
I tried Scala as a new programming language that is easy to learn, and after it intrigued me, I wanted to do more than take practice tests. As a web developer by nature, I am trying to solve the first simple problem: writeCreate a web application in the Scala environment.
Try To Lift
I thought the easiest solution would be to start with their framework: I downloaded Lift, the leading Scala web framework. A sample for old school programmers like myself is usually available (from_mvc) ready to be built and run from Maven.
Frame Creates Structure
Lift is powered by Jetty (an embedded servlet container) for rapid development; As always, since all code is compiled into our own JVM bytecode, the servlet containers you can use are usually the same as Java for web applications.
If we look at the base lumber for lifting, we find some interesting places:
main/scala/bootstrap/liftweb/Boot.scala is that you simply use the bootstrap class to configure things like character encoding and routes.
// actualth fragmentItem time is now // create almost any function (NodeSeq => NodeSeq) // Spec sets the current time with // The body of the specific incoming element def render implies *" "*#> now.toString
Well, it’s a bit tricky, like any framework: it has a learning curve that I’ll have to work on. Let’s try something faster. Of course, the latest version has some nice build and deploy tools that have been built in before, but I’d say it doesn’t just let me know what’s under the hood.
Old Simple Minimal Servlets
The common denominator of JVM web development is the servlet API. I found the HelloScalaServlet class that conforms to this common standard and started creating a little Java code hello example for beginners.
package com.dzone;import javax.servlet.http.HttpServlet, HttpServletRequest => HSReq, HttpServletResponse => HSRespHelloScalaServlet class extends HttpServlet replace outl doGet(req: HSReq, respectively: HSResp) = or getWriter().print("" + "
Hello Rock!" + "Hello Scala! Thisabout servlet." + "")
This servlet requires some configuration to run, for example due to a simple WEB-INF.xml file for a crooked route:
helloWorld com.dzone.HelloScalaServlet helloWorld /hello