Dynamic Web Module 3 0 -- 3 1

Question

I have a mavenized codebased configured Spring 3 2 4 web app   When I build the app with Maven pom xml first I got an error that web xml is missing   first I tried to create an empty web xml  this was the moment when The project facets changed  and I don t know why   It switched from dynamic Web Module 3 0 to 3 1 and this is irreversible   How can I change it again into Dynamic Web Modules 3 0        Additionally I can t remove the JAX-RS  Trying this it results in   Failed while uninstalling JAX-RS  REST Web Services  1 0  org eclipse jst javaee web internal impl WebAppImpl cannot be cast to org eclipse jst j2ee webapplication WebApp   Later I found out that I can avoid the Maven compile error by inserting the according plugin into pom xml    lt plugin gt       lt groupId gt org apache maven plugins lt  groupId gt       lt artifactId gt maven-war-plugin lt  artifactId gt       lt version gt 2 4 lt  version gt       lt configuration gt           lt failOnMissingWebXml gt false lt  failOnMissingWebXml gt       lt  configuration gt   lt  plugin gt

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I opened the project org eclipse wst common project facet core xml and first changed then removed line with web module tag  Cleaned project and launched on Tomcat each time but it still didn t run  Returned line  as was  and cleaned project  Opened Tomcat settings in Eclipse and manually added project to Tomcat startup  Right click   Add and Remove   Clicked on project and selected Run on server    and everything was fine

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I had the same problem and fixed this by editing org eclipse wst common project facet core xml   In this file  I was able to change the following line   lt installed facet  jst web  version  3 1   gt    back to    lt installed facet  jst web  version  3 0   gt    That seemed to fix the problem for me

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I had similar troubles in eclipse and the only way to fix it for me was to    Remove the web module Apply Change the module version Add the module Configure  Further configuration available link at the bottom of the dialog  Apply   Just make sure you configure the web module before applying it as by default it will look for your web files in  WebContent  and this is not what Maven project structure should be   EDIT    Here is a second way in case nothing else helps   Exit eclipse  go to your project in the file system  then to  settings folder   Open the org eclipse wst common project facet core xml   make backup  and remove the web module entry     You can also modify the web module version there  but again  no guarantees

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Open Eclipse project properties  in Project Facets unselect  Dynamic Web Module      Click OK Maven -  Update project

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Go to Workspace location select your project folder  setting folder edit  org eclipse wst common project facet core  change installed facet  jst web  version  3 0

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1  Go to your project and find   settings  directory this one 2  Open file xml named  org eclipse wst common project facet core xml 3      lt  xml version  1 0  encoding  UTF-8   gt       lt faceted-project gt       lt fixed facet  wst jsdt web   gt       lt installed facet  java  version  1 5   gt       lt installed facet  jst web  version  2 3   gt       lt installed facet  wst jsdt web  version  1 0   gt    lt  faceted-project gt    Change jst web version to 3 0 and java version to 1 7 or 1 8  base on your current using jdk version   4  Change your web xml file under WEB-INF directory   please refer to this article  https   www mkyong com web-development the-web-xml-deployment-descriptor-examples  5  Go to pom xml file and paste these lines      lt build gt       lt finalName gt YOUR PROJECT NAME lt  finalName gt       lt plugins gt           lt plugin gt               lt groupId gt org apache maven plugins lt  groupId gt               lt artifactId gt maven-compiler-plugin lt  artifactId gt               lt version gt 3 3 lt  version gt               lt configuration gt                   lt source gt 1 8 lt  source gt  THIS IS YOUR USING JDK s VERSION                  lt target gt 1 8 lt  target gt  SAME AS ABOVE              lt  configuration gt           lt  plugin gt       lt  plugins gt   lt  build gt

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I was running on Win7  Tomcat7 with maven-pom setup on Eclipse Mars with maven project enabled  On a NOT running server I only had to change from 3 1 to 3 0 on this screen    For me it was important to have Dynamic Web Module disabled  Then change the version and then enable Dynamic Web Module again

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If you want to use version 3 1 you need to use the following schema     http   xmlns jcp org xml ns javaee web-app 3 1 xsd   Note that 3 0 and 3 1 are different  in 3 1 there s no Sun mentioned  so simply changing 3 0 xsd to 3 1 xsd won t work    This is how it should look like    lt  xml version  1 0  encoding  UTF-8   gt   lt web-app xmlns xsi  http   www w3 org 2001 XMLSchema-instance           xsi schemaLocation  http   xmlns jcp org xml ns javaee            xmlns web  http   xmlns jcp org xml ns javaee web-app 3 1 xsd           version  3 1  xmlns  http   xmlns jcp org xml ns javaee  gt    lt  web-app gt    Also  make sure you re depending on the latest versions in your pom xml  That is     lt plugin gt       lt groupId gt org apache maven plugins lt  groupId gt       lt artifactId gt maven-war-plugin lt  artifactId gt       lt version gt 2 6 lt  version gt       lt configuration gt                   lt  configuration gt   lt  plugin gt    and    lt dependency gt       lt groupId gt javax servlet lt  groupId gt       lt artifactId gt javax servlet-api lt  artifactId gt       lt version gt 3 1 0 lt  version gt       lt scope gt provided lt  scope gt   lt  dependency gt    Finally  you should compile with Java 7 or 8    lt plugin gt       lt groupId gt org apache maven plugins lt  groupId gt       lt artifactId gt maven-compiler-plugin lt  artifactId gt       lt version gt 3 3 lt  version gt       lt configuration gt           lt source gt 1 7 lt  source gt           lt target gt 1 7 lt  target gt       lt  configuration gt   lt  plugin gt

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In a specific case the issue is due to the maven-archetype-webapp which is released for a dynamic webapp  faceted to the ver 2 5  see the produced web xml and the related xsd  and it s related to eclipse  When you try to change the project facet to dynamic webapp   2 5 the src folder structure will syntactically change  the 2 5 is different from 3 1   but not fisically   This is why you will face in a null pointer exception if you apply to the changes   To solve it you have to set from the project facets configuration the Default configuration  Apply the changes  then going into the Java Build Path you have to remove the  src folder and create the  src main java folder at least  it s also required  src main resources and  src test java to be compliant  re-change into the required configuration you desire  3 0  3 1  and then do apply

[eclipse] Dynamic Web Module 3.0 -- 3.1

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