How to know which servlet and JSP version am I using?

Question

Can you tell me how to know which servlet and JSP version am I using ? I use NetBeans IDE 7.1.2 for creating Servlets and JSP.

The IDE doesn't have anything to do with the JSP and Servlet version of your application. That's declared in the web.xml. — Luiggi Mendoza, Jun 30 '13 at 07:32
Check the declarations in your xml files. Also, if you can, check the jars in the classpath of your project. — acdcjunior, Jun 30 '13 at 07:32
@acdcjunior the jars are not the best reference here, since a web application server could handle more than one version of servlets thus accepting wars that use old servlet versions. — Luiggi Mendoza, Jun 30 '13 at 07:35
@LuiggiMendoza Are you sure? I thought the servlet spec didnt allow that. Anyway, the jars would tell more what is the version the Netbeans project is targeting. — acdcjunior, Jun 30 '13 at 07:51
@acdcjunior the jars will vary depending on the web application server target (that's why you choose it when creating the project). — Luiggi Mendoza, Jun 30 '13 at 07:52
@LuiggiMendoza I agree, that's why I thought they could help (if he had chosen servlet 2.5 while creating the project, the corresponding jars should be at the project's classpath). The "are you sure" part was about the server handling more than one version of the servlet-api. — acdcjunior, Jun 30 '13 at 07:57
As an additional information, in case you are using Tomcat: [The mapping between the Servlet/JSP specifications and the respective Apache Tomcat versions](http://tomcat.apache.org/whichversion.html) — informatik01, Jun 30 '13 at 10:57

score 39 · Answer 1 · edited Jul 20 '17 at 23:02

39

You can easily check the JSP,SERVER and SERVLET version. Add the following code in your jsp page after that run using any IDE Tools.

Server Version: <%= application.getServerInfo() %><br>
Servlet Version: <%= application.getMajorVersion() %>.<%= application.getMinorVersion() %>
JSP Version: <%= JspFactory.getDefaultFactory().getEngineInfo().getSpecificationVersion() %> <br>

edited Jul 20 '17 at 23:02

David Guyon

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answered Nov 27 '13 at 03:57

Kannan Arumugam

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score 22 · Accepted Answer · edited Mar 21 '22 at 08:55

22

You can get the details programatically using ServletContext #getMajorVersion() and #getMinorVersion().

For knowing the JSP version corresponding to the Servlet, you can get details from this Tomcat page.

Below is a brief summary (check Tomcat's corresponding version at the link above):

Servlet 4.0 uses JSP 2.3
Servlet 3.1 uses JSP 2.3
Servlet 2.5 uses JSP 2.1
Servlet 2.4 uses JSP 2.0
Servlet 2.3 uses JSP 1.2
Servlet 2.2 uses JSP 1.1
Servlet 2.1 uses JSP 1.0

edited Mar 21 '22 at 08:55

bluish

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answered Jun 30 '13 at 07:39

Vikas V

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This only returns the max version as **supported** by the servletcontainer. This doesn't return the version currently **used** by the running webapp. This is dictated by `web.xml`. – BalusC Jun 30 '13 at 17:15

score 21 · Answer 3 · edited Jan 30 '20 at 19:17

21

The version is declared in the web.xml file using the attribute version.

<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
     version="2.5">
...
</web-app>

How to know which servlet and JSP version am I using?

3 Answers3

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