Jasper is a Tomcat’s JSP engine

It parses JSP files to compile them into JAVA code as servlets

At runtime, Jasper allows to automatically detect JSP file changes and recompile them

It displays the default tables in the database

You have to follow the standard instructions for when the isapi_redirector.dll

Configure IIS to use “integrated windows security”

Ensure that in the server.xml you have disable tomcat authentication

If you are running a bean property, use the .operator, and if you are executing a map value or an array index,
it is preferred to use the [] operator. Although you can use these operators interchangeably.

The default port for Tomcat is 8080. After initializing Tomcat on your local machine, you can verify if
Tomcat is running the URL: http://localhost:8080

In Tomcat, two types of connectors are used

HTTP Connectors: It has many attributes that can be changed to determine exactly how it works and access
functions such as redirects and proxy forwarding

AJP Connectors: It works in the same manner as HTTP connectors, but they practice the AJP protocol in
place of HTTP. AJP connectors are commonly implemented in Tomcat through the plug-in technology
mod_jk.

Catalina consists of configuration files are

• policy
• properties
• properties
• xml
• xml
• Tomcat-users.xml
• xml

Running Tomcat as a windows service provides benefits like

Automatic startup: It is crucial for environment where you may want to remotely restart a system after
maintenance

Server startup without active user login: Tomcat is run often on blade servers that may not even have an
active monitor attached to them. Windows services can be started without an active user

Security: Tomcat under window service enables you to run it under a special system account, which is
protected from the rest of the user accounts

You would use Tomcat to handle connection, when you are running Tomcat as a stand-alone web server.

JSPs, servlets, and their supporting files are placed in the proper subdirectories under the web apps
directory in Tomcat. You can make all the files under the web apps directory into one compressed file,
which ends with .war file extension. You can execute a web application by placing a WAR file in the
webapps directory. When a web server starts executing, it pulls out the WAR file’s contents into the
appropriate webapps sub-directories.

A tomcat valve- a new technology is introduced with Tomcat 4 which enables you to link an instance of a
Java class with a specific Catalina container.

Four types of valves Tomcat is configured with

• Access Log
• Remote Address Filter
• Remote Host Filter
• Request Dumper

The life-cycle of a typical servlet running on Tomcat

• Tom-cat receives a request from a client through one of its connectors
• For processing, this request Tomcat maps this request to appropriate
• Once the request has been directed to the appropriate servlet, Tomcat verifies that servlet class has been

          loaded. If it is not than Tomcat wraps the servlet into Java Bytecode, that is executable by the JVM and
          forms an instance of the servlet

• Tomcat initiates the servlet by calling its init The servlet contains code that is able to screen Tomcat

           configuration files and act accordingly, as well as declare any resources it might require

• Once the servlet has been started, Tomcat can call the servlet’s service method to proceed the request
• Tomcat and the servlet can co-ordinate or communicate through the use of listener classes during the

           servlet’s lifecycle, which tracks the servlet for a variety of statemchanges.

• To remove the servlet, Tomcat calls the servlets destroy method.

The purpose of NAT protocol is to hide private IP address from public IP address and give a certain level
of security to the organization.

MAC means Medium Access Control

Tom coyote is an HTTP connector based on HTTP/ 1.1 specification which receives and transport web
requests to the Tomcat engine by listening to a TCP/IP port and sent request back to the requesting client.

Transaction with HTTP request and HTTP response is called webserver. Using the internet listening the
HTTP request and providing the HTTP response is also called webserver.It gives only html output. It will
not process business logic .They can provide Http server. They are static.

The basic difference between a web server and an application server is

• Webserver can execute only web applications i,e servlets and JSPs and has only a single container known

as Web container which is used to interpret/execute web applications

• Application server can execute Enterprise application, i,e (servlets, jsps, and EJBs) it is having two

containers 1. Web Container(for interpreting/executing servlets and jsps)

• EJB container(for executing EJBs). it can perform operations like load balancing , transaction demarcation

etc etc

Tomcat is a webserver, Which is support 3 –tier archeticture..

Yes we can

in web.xml

<web-apps>

<servlet-name>

<servlet-class>

it displays the default tables in database

Web server (for development) that supports servlets 2.3 and JSP 1.2 (Tomcat 4) or servlets 2.4 and JSP 2.0
(Tomcat 5).

Your set up might have been not done well.

Make sure you have added tomcat root directory path in the CATALINA_HOME environment variable
and added the bin path in the path variable.

Struts or any webserver makes new thread for each new request. so multiple request is served with new
request object.

by using plug module

The tomcat server keeps a copy of compiled servlets and JSP’s present in all deployed web application at
the following location.

$Tomcat_ServerworkCatalinalocalhost

To clear the cache, you just need to delete the folder corresponding to the web application for which you
want to clear the cache.

Tomcat server provides a host of services which are not provided by normal web servers like Apache Web
Server. The following is a list of services provided by Tomcat:

1) Life cycle Management

2) Handling Web Requests

3) Thread Management

4) Connection pooling

5) Clustering

Apart from the above service, you can also tell about the various tomcat components about which not
everyone is aware in detail.

The steps to configure connection pool:

1) Configure pool in context.xml inside conf folder of tomcat.

2) Perform a JNDI lookup of pool and get connection from data source.

The JDBC connection pooling page shows how one can create connection pool in tomcat server.

There should be only one jar file for a particular library and if there is a clash, you should be using the
version of library provided by the server which can avoid problems arising when deploying the application
on client machines.

The typical web application structure which is deployed on tomcat is:

images

js

src

WEBINF

|classes

|lib

|web.

xml

index.

html

Ideally speaking, tomcat is neither a web server not application server because of the following points:

a) Tomcat has servlet and JSP engine present in it which is not provided by web servers

b) Tomcat can not run EJB based applications which can be run by application servers.

Apache Tomcat wiki lists down the steps for configuring clustering in the guide at Tomcat server clustering

We can define welcome file list in web.xml deployment descriptor by using the welcomefilelist tag as
shown in the following sample code:

<welcome?file?list>

<welcome?file>index.html</welcome?file>

<welcome?file>index.htm</welcome?file>

<welcome?file>index.jsp</welcome?file>

</welcome?file?list>

The actual welcome file being presented to the user shall be decided from the above list. If index.html is
present then it shall be shown. If no index.html file is present in the root folder of web application, then

server tries to find a file with the name index.htm and that also fails then it finds index.jsp.

Application server is broader term where a host services apart from deploying a JSP/Servlet based
application are provided. Tomcat is a web server and not application server. This is because of the fact that
Tomcat doesn’t provide services to install/manage EJB and JMS based applications.

If you want tomcat to accept requests for multiple hosts e.g. www.myhostname.com then you must.

• Create ${catalina.home}/www/appBase , ${catalina.home}/www/deploy, and${catalina.home}/conf/Catalina/www.myhostname.com.
• Add a host entry in the server.xml file.
• Create the following file under conf/Catalina/www.myhostname.com/ROOT.xml.
• Add any parameters specific to this hosts webapp to this context file.
• Put your war file in ${catalina.home}/www/deploy.
• When tomcat starts, it finds the host entry, then looks for any context files and will start any apps with a
• context.

To add more sites just repeat and rinse, all webapps can share the same war file location and appbase.

Jasper is a program to read the .class files in binary format. This program can generate ASCII files , which
can be used along with Jasmin Assembler. Jasper is intended for generating input into a class file browser
which can produce the hierarchy of inheritance and composition maps from the .class files.

Your set up might have been not done well. Make sure you have added tomcat root directory path in the
CATALINA_HOME environment variable and added the bin path in the path variable.

In windows environment , open up your startup.bat and add to file somewhere in beginning

• rem set remote debugger
• set JPDA_ADDRESS=8001
• set JPDA_TRANSPORT=dt_socket
• echo Remote debugging started

Add this to end of your startup.sh file

call "%EXECUTABLE%" jpda start

%CMD_LINE_ARGS%

Make sure you comment out

call "%EXECUTABLE%" start

%CMD_LINE_ARGS%

When you are connecting with eclipse, set your debug port at 8001. Now when you start your server , you
would see the message Remote debugging started