As usual, a book follows the original message. I apologize for the length.
/mde/ --- Original Message --- From: Karl Schmitt <karlschmitt1...@googlemail.com> To: Tomcat Users List <users@tomcat.apache.org> Sent: Sun, April 24, 2011 2:06:25 AM Subject: Re: Problems deploying a servlet on ubuntu Thanks Andre, for answering my call for help, I tried to answer you questions as best as I could below: Tomcat was installed using the synaptic packet management I just ticked tomcat6 and hit the apply button, and tomcat and all its dependencies were installed and http://locaclhost:8080 started to work, that was the easy part :-) karl@sonoma:/usr/share/tomcat6/bin$ ./version.sh Using CATALINA_BASE: /usr/share/tomcat6 Using CATALINA_HOME: /usr/share/tomcat6 Using CATALINA_TMPDIR: /usr/share/tomcat6/temp Using JRE_HOME: /usr/lib/jvm/java-1.6.0-openjdk Using CLASSPATH: /usr/share/tomcat6/bin/bootstrap.jar Server version: Apache Tomcat/6.0.24 Server built: March 24 2011 1829 Server number: ...0 OS Name: Linux OS Version: 2.6.32-31-generic Architecture: i386 JVM Version: 1.6.0_20-b20 JVM Vendor: Sun Microsystems Inc. karl@sonoma:/usr/share/tomcat6/bin$ karl@sonoma:/usr/share/tomcat6/bin$ echo $JAVA_HOME /usr/lib/jvm/java-1.6.0-openjdk karl@sonoma:/usr/share/tomcat6/bin$ java -version java version "1.6.0_20" OpenJDK Runtime Environment (IcedTea6 1.9.7) (6b20-1.9.7-0ubuntu1~10.04.1) OpenJDK Client VM (build 19.0-b09, mixed mode, sharing) My web.xml is located here: karl@sonoma:/usr/share/tomcat6/webapps/ch1/WEB-INF$ ls classes web.xml My servlet is located here: karl@sonoma:/usr/share/tomcat6/webapps/ch1/WEB-INF/classes$ ls Ch1Servlet.class karl@sonoma:/etc/tomcat6$ ls Catalina context.xml policy.d tomcat-users.xml catalina.properties logging.properties server.xml web.xml karl@sonoma:/etc/tomcat6$ --------------------------------------------------------------- My grep for "host" in server.xml: karl@sonoma:/etc/tomcat6$ grep -A 5 "[Hh]ost" server.xml on to the appropriate Host (virtual host). Documentation at /docs/config/engine.html --> <!-- You should set jvmRoute to support load-balancing via AJP ie : <Engine name="Catalina" defaultHost="localhost" jvmRoute="jvm1"> --> <Engine name="Catalina" defaultHost="localhost"> <!--For clustering, please take a look at documentation at: /docs/cluster-howto.html (simple how to) /docs/config/cluster.html (reference documentation) --> <!-- -- <!-- Define the default virtual host Note: XML Schema validation will not work with Xerces 2.2. --> <Host name="localhost" appBase="webapps" unpackWARs="true" autoDeploy="true" deployOnStartup="true" xmlValidation="false" xmlNamespaceAware="false"> <!-- SingleSignOn valve, share authentication between web applications Documentation at: /docs/config/valve.html --> -- prefix="localhost_access_log." suffix=".txt" pattern="common" resolveHosts="false"/> --> </Host> </Engine> </Service> </Server> karl@sonoma:/etc/tomcat6$ ------------------------------------------------------------------------------------ here I will try to attach the whole server.xml file: On Sat, Apr 23, 2011 at 11:41 AM, André Warnier <a...@ice-sa.com> wrote: > Sorry, but I don't know the book. >So maybe you can tell us some more : >- how did you install Tomcat ? where did you get it ? >- what version is it ? >(go to the "bin" directory of tomcat, and run "./version.sh"; paste the result >here)(*) >- what version is the JVM ? ("java -version" may tell you, if the above >doesn't) >- can you give us the exact paths where you installed your servlet files ? >(the >servlet itself and the web.xml file) >- in the Tomcat "conf" directory (in your case, it may be in /etc/tomcatxx), >there is a file "server.xml". In that file, is a <Host> tag, which gives the >path for the webapps directory (in the "appBase" attribute). Which is that ? > > >(*) if this is a "packaged" tomcat, this may complain that JAVA_HOME is not >set. > > If so, you first have to locate what JAVA_HOME should be set to. Look then > in >/etc/init.d/tomcatxx to find out. --- End Original Message --- First, a caveat. I run Fedora, not Ubuntu so your mileage may vary. I also only have the first edition of the book, so the instructions may have changed between editions. By the way, I like the book (and Head First books in general). Short version for the impatient: 1. You probably have a permissions problem. The packaged installation of Tomcat may not have the permissions to read your web application that you copied into /usr/share/tomcat6/webapps/ch1. You could fix this by doing the appropriate chmod for your system. However, see below for a different approach. 2. You are you using OpenJDK This won't impact you in the short term. However, there have been several issues reported on the mailing list that have been cleared up by using the Oracle JDK and JRE. You can install these with apt-get on Ubuntu. 3. Solution Install a local copy of Tomcat from tomcat.apache.org in your home directory. Use this for development work. Install Oracle's JDK and JRE. There are several examples on how to do this with Ubuntu. Make sure it's your default JDK and JRE. Longer version: The packaged version of Tomcat is designed to run as a service, and may not be as easy to use for development. Starting and stopping probably requires root access, so integration down the road with an IDE such as NetBeans or Eclipse will be difficult. Another issue you may run into is one of permissions. Depending on how you copied your Chapter 1 web application into /usr/share/tomcat6/webapps, the Tomcat process may not have read permissions on the files, nor execute permissions on the directory. I was able to simulate a 404 on my system by changing ownership of a web application, and removing "other" read and execute access. There have been several issues reported on the mailing list that have been traced back to using OpenJDK. It's much safer to install Oracle's JDK and use that as your default Java. Here's a link to one way to install Oracle's JDK / JRE. http://thilina.gunarathne.org/2011/02/installing-sun-oracle-jdk-6-on-ubuntu.html Since I don't use Ubuntu, it's probably best to verify this before installing on you system. I find the easiest way to do servlet/jsp development work on Linux is the following: 1. Install Oracle's JDK and JRE. This is distribution-specific. I gave one link I found for Ubuntu, but please check for your distribution. Make sure that this is your default Java (java -version and javac -version). 2. Get a tar.gz copy of the latest Tomcat from tomcat.apache.org The first edition of the book covers the servlet 2.4 specification, so technically 5.5.33 is all that's required. The second edition of the book covers the servlet 2.5 specification, so technically 6.0.32 is all that's required. That being said Tomcat 7.0.12 should run both 2.4 and 2.5 specification web applications just fine. You might as well go for the latest and position yourself to learn the 3.0 servlet specifications down the road. 3. Unpack the Tomcat distribution in your home directory somewhere. I tend to make a separate directory and unpack it there. This makes my home directory a bit neater since I have several different Tomcat versions as well as a few cluster configurations. 4. Follow the instructions on editing tomcat-users.xml This varies slightly depending on which Tomcat version you're running. Make sure the users are not commented out. 5. Make sure the system version of Tomcat is stopped. The easiest way to do development work with your personal copy of Tomcat is to stop the system copy of Tomcat. There are ways to run both (involves changing some ports, and is not too difficult), but for learning purposes this is probably not necessary. Now you have a standard environment to work with while learning servlets, jsp, and web application design patterns. This will make it easier for you to follow along in the Head First book. It will also make it easier for you to get help from the Tomcat mailing list. Welcome to Java web application programming. . . . . just my two cents. /mde/ --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
