javaeclipsespring-mvctomcatjava-web-start

Why the Apache Tomcat v9.0 couldn't to be selected as the runtimes

Here is the problem: when build a maven project, and try to convert it to Dynamic Web Project, the Apache Tomcat v9.0 couldn't be selected. The Tomcat has configure successfully that it could show web at loacalhost:8080/, but it still couldn't be selected. enter image description here

Solution

  • Use Dynamic Web Project v4 with Tomcat v9.0.x

    When in Project Facets preferences view, if the Dynamic Web Project facet is selected the following help text could appear on Details tab.

    Adds support for the Java or Jakarta Servlet API, for generation of dynamic Web page content.

    So you must choose a version of Dynamic Web Project that maps to the version of the Jakarta Servlet technology (Wikipedia) supported by your chosen version of Tomcat.

    See list of supported Servlet API versions by Tomcat version. Tomcat 9.0.x supports Servlet 4.0, and requires Java 8+. Find the Servlet 4.0 specification and Javadoc here.

    As an alternative, servlet supported versions can be found by inspecting servlet-api.jar from tomcat lib

    jar -tf /home/lmc/projects/bin/apache-tomcat-9.0.19/lib/servlet-api.jar | grep 'web-app'

    Result

    javax/servlet/resources/web-app_2_2.dtd
javax/servlet/resources/web-app_2_3.dtd
javax/servlet/resources/web-app_2_4.xsd
javax/servlet/resources/web-app_2_5.xsd
javax/servlet/resources/web-app_3_0.xsd
javax/servlet/resources/web-app_3_1.xsd
javax/servlet/resources/web-app_4_0.xsd

    For tomcat 10

    TZ='UTC' jar -tvf /home/lmc/projects/bin/apache-tomcat-10.1.24/lib/servlet-api.jar | grep 'web-app'

    Result

     16219 Fri Feb 01 00:00:00 UTC 1980 jakarta/servlet/resources/web-app_2_2.dtd
 30251 Fri Feb 01 00:00:00 UTC 1980 jakarta/servlet/resources/web-app_2_3.dtd
 39466 Fri Feb 01 00:00:00 UTC 1980 jakarta/servlet/resources/web-app_2_4.xsd
 45121 Fri Feb 01 00:00:00 UTC 1980 jakarta/servlet/resources/web-app_2_5.xsd
 10820 Fri Feb 01 00:00:00 UTC 1980 jakarta/servlet/resources/web-app_3_0.xsd
 12638 Fri Feb 01 00:00:00 UTC 1980 jakarta/servlet/resources/web-app_3_1.xsd
 14106 Fri Feb 01 00:00:00 UTC 1980 jakarta/servlet/resources/web-app_4_0.xsd
 12747 Fri Feb 01 00:00:00 UTC 1980 jakarta/servlet/resources/web-app_5_0.xsd
 12747 Fri Feb 01 00:00:00 UTC 1980 jakarta/servlet/resources/web-app_6_0.xsd

    The latest version of Tomcat is 11.0.x, supporting the latest Servlet 6.1 specification, requiring Java 17+.