Initializing servlet in Tomcat

Question

For my domain (palibacsi.de) under a Tomcat server I made a servlet that is supposed to run after the user types in some data. But I get an error message

maybe i did somthing wrong in the web.xml file when initializing the servlet?

<servlet>
     <servlet-name>PaliServlet</servlet-name>
     <servlet-class>PaliServlet</servlet-class>
</servlet>

<servlet-mapping>
   <servlet-name>PaliServlet</servlet-name>
   <url-pattern>/PaliServlet</url-pattern>
</servlet-mapping>

the servlet is in the folder where (I guess) it should be, /home/palibacs1/appservers/apache-tomcat-8.0.37/webapps/PaliServlet.class

Thanks in advance

Exception report message Error instantiating servlet class webapps.PaliServlet description The server encountered an internal error that prevented it from fulfilling this request. exception javax.servlet.ServletException: Error instantiating servlet class webapps.PaliServlet org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616) — bebe böbe, Aug 06 '17 at 18:53
That's not sufficient, there is more of it than that. There is a 'caused by' exception further down. — user207421, Aug 07 '17 at 00:10
Ok, one of the problems was seemingly that i got at home Java 1.7 and the server was 1.8. - The sytem administrator fixed everything: "switched your JDK to 1.8 In conf/server.xml I set Paliba as default application I created simple /webapps/Paliba/WEB-INF/web.xml where URL is mapped to servlet class" — bebe böbe, Aug 07 '17 at 20:35

score 0 · Answer 1 · answered Aug 06 '17 at 18:41

0

You need to give the class path of your servlet relative to your source folder in the servlet-class field.

Lets say your PaliServlet class is located inside Servlets folder in java folder marked as source folder. Then you need to give :

  <servlet>
     <servlet-name>PaliServlet</servlet-name>
     <servlet-class>Servlets.PaliServlet</servlet-class>
  </servlet>

  <servlet-mapping>
     <servlet-name>PaliServlet</servlet-name>
      <url-pattern>/PaliServlet</url-pattern>
  </servlet-mapping>

answered Aug 06 '17 at 18:41

sourabh1024

647
5
15

Thanks for the answer. The "webapps" folder, which contains the servlet, is the folder where Tomcat is looking for servlets in the first place (if i got it right), so it is not contained in an extra forlder inside webapps, it is directly in the "source folder" webapps. – bebe böbe Aug 06 '17 at 18:47
I did as you told and amended the path to: webapps.PaliServlet, then I got a different error message: Exception report message Error instantiating servlet class webapps.PaliServlet description The server encountered an internal error that prevented it from fulfilling this request. exception javax.servlet.ServletException: Error instantiating servlet class webapps.PaliServlet org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) etc. – bebe böbe Aug 06 '17 at 18:51
Can you give the complete error stack trace ? – sourabh1024 Aug 06 '17 at 18:59
now the message is simply : HTTP Status 404 - type Status report message description The requested resource is not available. - You can check it if you visit the website Palibacsi.de and type in 2 random answers. – bebe böbe Aug 06 '17 at 19:03
Can you give the resource path . i.e folders structure. It seems your path of servlet is still incorrect. – sourabh1024 Aug 06 '17 at 19:14
the main folder is "/home/palibacs1". This has several folders. Tomcat is in appservers/apache-tomcat-8.0.37. This has a webapps folder, the PaliServlet.class file is there. If there is an html command to print the folder structure on the screen, i can put it on the html site of my domain... – bebe böbe Aug 06 '17 at 19:16
Try adding your servlet class in /home/palibacs1/. And then give home.palibacs1.PaliServelet as servelt-class – sourabh1024 Aug 06 '17 at 19:24
Ok, I have tried that as you wrote, but i get the same error message. – bebe böbe Aug 06 '17 at 19:31

score 0 · Answer 2 · answered Aug 06 '17 at 20:46

0

Your servlet class PaliServlet should have in /home/palibacs1/appservers/apache-tomcat-8.0.37/webapps/{Your_Project_Name}/WEB-INF/classes directory.

answered Aug 06 '17 at 20:46

atiqkhaled

386
4
19

Thanks, I have tried your solution, but I get the same error message: java.lang.ClassNotFoundException: home.palibacs1.appservers.apache-tomcat-8.0.37.webapps.Paliba.WEB-INF.classes.PaliServlet – bebe böbe Aug 06 '17 at 20:56
What abt your web.xml servlet-class path? – atiqkhaled Aug 06 '17 at 20:58
it is home.palibacs1.appservers.apache-tomcat-8.0.37.webapps.Paliba.WEB-INF.classes.PaliServlet – bebe böbe Aug 06 '17 at 21:03
make it like this `PaliSer‌vlet` . Hope it works then. – atiqkhaled Aug 06 '17 at 21:07
thanks - no, it still does not find the class, even if I write only "PaliServlet" in the class path as you suggested. - I will try to get someone look at it next week IRL on my computer, and write the solution here, which has to be sg pretty obvious thing which i overlooked. – bebe böbe Aug 06 '17 at 21:14
ok..can you restart your tomcat server and check again. Make sure configuration is same as i mentioned. – atiqkhaled Aug 06 '17 at 22:01
ok, thanks. Btw. the project's name is Paliba, and now its not indicated in the class path, but even when I put it in the class path it did not find the servlet – bebe böbe Aug 06 '17 at 22:06

Initializing servlet in Tomcat

2 Answers2