Today we will start from the notes of Wed July 22:

  http://silo.cs.indiana.edu:44063/

That day we installed Tomcat. 

We need two ports for Tomcat, two new ports. 

Our Apache ports are 44xxx (mine, for example, is 44063). 

Your Tomcat ports are 43xxx and 42xxx (mine: 43063 and 42063). 

If you follow(ed) the instructions your Tomcat will be available from

  http://silo.cs.indiana.edu:43xxx

Last time we started the servers and created a simple index.html in 

  $CATALINA_HOME/webapps/ROOT

Let's check if the servers are still up. 

Here's what we see for Gang:

-bash-3.2$ ps -ef | grep ggh
root      1317  3861  0 15:40 ?        00:00:00 sshd: gghuang [priv]
gghuang   1320  1317  0 15:40 ?        00:00:00 sshd: gghuang@pts/12
gghuang   1321  1320  0 15:40 pts/12   00:00:00 -bash
dgerman   1879   775  0 15:45 pts/0    00:00:00 grep ggh
gghuang  26214     1  0 Jul22 ?        00:00:31 /l/jdk1.5/bin/java -Djava.util.logging.config.file=/u/gghuang/apache-tomcat-5.5.27/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djava.endorsed.dirs=/u/gghuang/apache-tomcat-5.5.27/common/endorsed -classpath :/u/gghuang/apache-tomcat-5.5.27/bin/bootstrap.jar:/u/gghuang/apache-tomcat-5.5.27/bin/commons-logging-api.jar -Dcatalina.base=/u/gghuang/apache-tomcat-5.5.27 -Dcatalina.home=/u/gghuang/apache-tomcat-5.5.27 -Djava.io.tmpdir=/u/gghuang/apache-tomcat-5.5.27/temp org.apache.catalina.startup.Bootstrap start
-bash-3.2$ 

Let's stop those servers that are still running. 

One option is: run

  $CATALINA_HOME/bin/shutdown.sh

But this is not available since the environment variable is not defined. 

Why? Because our definitions last time were only temporary. 

Let's make them permanent: 

  pico -w ~/.bash_profile

In it at the end place these lines:

JAVA_HOME=/l/jdk1.5
export JAVA_HOME
CATALINA_HOME=/u/dgerman/apache-tomcat-5.5.27
export CATALINA_HOME
CLASSPATH=.:$CATALINA_HOME/common/lib/servlet-api.jar
export CLASSPATH

In the third line replace dgerman with your actual username. 

So I assume that your settings are permanent now and your Tomcat is still running 
if you haven't stopped (since you started it, if did you start it at some point). 

So you can kill your server (using the process ID) or shutdown.sh

Now bring your servers down and verify that they are down. 

I used $CATALINA_HOME/bin/shutdown.sh followed by ps -ef | grep dgerman.

Let's go to $CATALINA_HOME/conf/tomcat-users.xml and add this line:

<user username="dgerman" password="sp00n" roles="manager"/>

So mine looks like this now:

<?xml version='1.0' encoding='utf-8'?>
<tomcat-users>
  <role rolename="tomcat"/>
  <role rolename="role1"/>
  <user username="tomcat" password="tomcat" roles="tomcat"/>
  <user username="both" password="tomcat" roles="tomcat,role1"/>
  <user username="role1" password="tomcat" roles="role1"/>
  <user username="dgerman" password="sp00n" roles="manager"/> 
</tomcat-users>

Now we start the server: 

$CATALINA_HOME/bin/startup.sh

Let's create a context and write our first web program/script. 

A context in Tomcat is a folder under webapps. 

You can choose any name for the context but the structure is given: 

-bash-3.2$ pwd
/u/dgerman/apache-tomcat-5.5.27/webapps
-bash-3.2$ du -a vikas
8       vikas/WEB-INF/lib
8       vikas/WEB-INF/classes
24      vikas/WEB-INF
32      vikas
-bash-3.2$ 

Let's go inside and create one.jsp:

Howdy.

-bash-3.2$ ls -l
total 16
-rw-r--r-- 1 dgerman faculty    7 Jul 24 16:32 one.jsp
drwxr-xr-x 4 dgerman faculty 4096 Jul 24 16:30 WEB-INF
-bash-3.2$ cat one.jsp 
Howdy.
-bash-3.2$ 

My Tomcat is not running, I start it, then check on-line: 

http://silo.cs.indiana.edu:43063/

The context is available, let's look at it: 

http://silo.cs.indiana.edu:43063/vikas

Looks like it's not available. That's because it doesn't have an index.html inside. 

But it's working so we can try: 

http://silo.cs.indiana.edu:43063/vikas/one.jsp

The JSP responds: Howdy. 

Let's develop a simple JSP.

I will need the flags at

http://silo.cs.indiana.edu:44063/images/

I change the JSP to: 

<%
  
  String number = request.getParameter("number");
  
  String[] names = { "Australia", "Brazil", "China", "Italy", "Russia", "South Africa", "Spain", "$
  
  int index = Integer.parseInt(number);
  
  index = index % names.length;
  
  String flag = names[index];
   
 %>

<form>

Here's a flag: <img src="http://silo.cs.indiana.edu:44063/images/<%=flag%>.png">

<input type="submit" name="something" value="Next">

<input type="hidden" name="number" value=<%=index+1%>>

</form>

This is keeping state in the normal way but crashes when you first call it. 

We'll discuss servlets on Monday.