Is there a better way than this?
Specifically - detect running Tomcat, then if under Tomcat (today only
interested in v7 and v9) obtain the version string as described [1] and shown
on the Manager web application.
import org.apache.catalina.core.*;
//...
public void init(ServletConfig config) throws ServletException
{
//java.util.logging...
log.log(Level.INFO, "config={0}", config);
ServletContext sc = config.getServletContext();
log.log(Level.INFO, "ServletContext={0}", sc);
if (sc instanceof ApplicationContextFacade)
{
try
{
ApplicationContextFacade acf = (ApplicationContextFacade) sc;
Field applicationContextField =
ApplicationContextFacade.class.getDeclaredField("context");
applicationContextField.setAccessible(true);
ApplicationContext applicationContext = (ApplicationContext)
applicationContextField.get(acf);
Field standardContextField =
ApplicationContext.class.getDeclaredField("context");
standardContextField.setAccessible(true);
StandardContext standardContext = (StandardContext)
standardContextField.get(applicationContext);
log.log(Level.INFO, "version={0}",
standardContext.getWebappVersion());
}
catch (RuntimeException | NoSuchFieldException |
IllegalAccessException e)
{
log.log(Level.WARNING, "unable", e);
}
}
}
1: https://tomcat.apache.org/tomcat-9.0-doc/config/context.html#Naming
--
Jason Pyeron | Architect
PD Inc |
10 w 24th St |
Baltimore, MD |
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tel : 202-741-9397
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