Exact functions of Servlet context and servlet Config inside web container

What is the correct(exact) function in the Servlet Context and Servlet Config inside the Web Container?.
Pls anybody response me.
-- Palani

ServletConfig:
The container reads the servlet init-parameters specified in web.xml then adds them to ServletConfig. The container then passes ServletConfig to the servlet. Thereafter, the servlet can access the ServletConfig and get the servlet init-parameters. The idea is that you can avoid hard coding data that might change in your servlet code, e.g. an email address. If the email address changes, you can change it in web.xml instead of having to hunt through all your code and change the email address every place it appears and then recompiling the servlet.
Servlet init-parameters in web.xml are targeted for one servlet.
ServletContext:
The ServletContext is an app wide bulletin board where you can post data. Other parts of your app, e.g. other servlets, can then read the data on the bulletin board.
Also, similar to ServeltConfig, the container reads context-init parameters from web.xml and inserts them into ServletContext. However, in this case they are inserted into an app wide bulletin board, and therefore all servlets can read them.
An example: you might put database connection info in some context-init parameters. Then when the ServletContext is created, you can have "a listener" respond to the ServletContext creation event and get the database info, create a database connection, and attach it to the ServletContext. Then the database connection will be available to any servlet that needs it.
palanithendral wrote:
What is the correct(exact) function in the Servlet Context and Servlet Config inside the Web Container?.
The exact function of each would be determined by the group of methods each one provides. You need to check the java docs to see what each method does.

Similar Messages

Calling nested function to perform DML and wait for commit

Hi everybody,
I would like to do some DML -- an insert statement, to be specific -- in a function and have the function then return the numeric key of the newly added row. I call this function from another context and woud then be able to use the newly added data to do some stuff.
More specifically, what I am going to do is this: I have a graph consisting of source, destination and distance triplets in a table. A user should now be able to
1.) add a node 'A' to the graph,
2.) add a node 'B' to the graph
3.) get the shortest path from A to B through the graph.
I have an inner function function INSERT_NEW_NODE(node_in in sdo_geometry, graph_in in integer) return integer
is
pragma autonomous_transaction;
cursor node_cur is
select
 source,
 source_geom
from graph
cursor edge_cur is
 select
 source,
 destination,
 distance,
 edge_geom
 from
 graph
 where
 sdo_geom.relate(edge_geom, 'anyinteract', node_in, .005) = 'TRUE';
begin
-- check if identical with any existing node
for node_rec in node_cur loop
 if sdo_geom.relate(node_rec.source_geom, 'EQUAL', node_in, .005) = 'EQUAL' then
 return node_rec.source;
 end if;
end loop;
-- get edges
for edge_rec in edge_cur loop
 -- new_node-->edge.destination and vice versa
 insert into
 graph
 ID,
 GRAPH,
 SOURCE,
 DESTINATION,
 DISTANCE,
 SOURCE_GEOM,
 DESTINATION_GEOM,
 EDGE_GEOM
 values
 graph_id_seq.nextval, --id
 graph_in, --graph
 morton(node_in.sdo_point.x, node_in.sdo_point.y), -- source morton key
 edge_rec.source, -- destination morton key
 sdo_geom.sdo_distance(edge_rec.source_geom_marl2000, node_in, .005, 'unit=M'), -- distance
 node_in, -- source geom
 edge_rec.source_geom, -- dest geom
 split_line(edge_rec.edge_geom_marl2000, node_in).segment1 -- edge geom
 commit;
 --new_node-->edge.source and vice versa
 insert into
 gl_graph
 ID,
 GRAPH,
 SOURCE,
 DESTINATION,
 DISTANCE,
 SOURCE_GEOM,
 DESTINATION_GEOM,
 EDGE_GEOM
 values
 graph_id_seq.nextval, --id
 graph_in, --graph
 edge_rec.source, -- source morton key
 morton(node_in.sdo_point.x, node_in.sdo_point.y), -- destination morton key
 sdo_geom.sdo_distance(edge_rec.source_geom, node_in, .005, 'unit=M'), -- distance
 edge_rec.source_geom, -- source geom
 node_in, -- dest geom
 split_line(edge_rec.edge_geom, node_in).segment2 -- edge geom
 commit;
end loop
return(morton(node_in.sdo_point.x, node_in.sdo_point.y));
end insert_new_node;, which adds the new nodes to the graph, connects, calculates distances etc. and returns a handle to the newly added node. I call this function twice from another, outer function function get_path (line_in in sdo_geometry, graph_in in integer) return sdo_geometry
is
source number;
destination number;
source_geom mdsys.sdo_geometry;
destination_geom mdsys.sdo_geometry;
begin
source := insert_new_node(get_firstvertex(line_in), graph_in);
destination := insert_new_node(get_lastvertex(line_in), graph_in);
-- source := insert_new_node(get_firstvertex(line_in), graph_in);
-- destination := insert_new_node(get_lastvertex(line_in), graph_in);
return(get_path_geom(source, destination)); --returns a geometry which is the shortest path between source and destination
end get_path;; and I think, I have to use automous transaction in the inner function, so that the outer function can see any change performed by the inner one. However, this only works, when I call the inner function twice (i.e. remove the comment signs in front of the last two lines of code right before the return statement in the outer function.
So here's my questions: 1.) Why do I have to call the function twice to see the transaction complete? and 2.) How can I avoid that? Is there a way to wait with the execution of the return statement in the inner function until the insert is committed and can be seen by the outer function?
Cheers!

Tanks, everybody, for your replies! Let me go through them one by one
smon asked: if you remove the pragma statement, does it work then?No, it does not, at least not, if I call the function from the outer function. In this case the insert statements in the inner function are not committed.
If I call the inner function like thisDECLARE
NODE_IN SDO_GEOMETRY;
GRAPH_IN NUMBER;
v_Return NUMBER;
BEGIN
NODE_IN := MDSYS.SDO_GEOMETRY(2001,<srid>,MDSYS.SDO_POINT_TYPE(<x>,<y>,<z>),NULL,NULL);
GRAPH_IN := 3;
v_Return := INSERT_NEW_NODE(
 NODE_IN => NODE_IN,
 GRAPH_IN => GRAPH_IN
DBMS_OUTPUT.PUT_LINE('v_Return = ' || v_Return);
:v_Return := v_Return;
END;, it works without autonomous transaction, but then again like this I do not use the handle to access the newly inserted data immediately to perform some other task with it.
sb92075 said:COMMIT inside LOOP is sub-optimal implementation (increases elapsed time) & can result in ORA-01555 error.Thanks, that was very helpful; I changed my code to commit outside of the loop, just before the return statement and it performs a lot faster now.
user1983440, regarding my statement I think, I have to use automous transaction in the inner function, so that the outer function can see any change performed by the inner one. asked: Are you certain that this is true? No, anything but certain. I should have said "It +seems+, I have to use autonomous transaction". I wish it would work without autonomous transaction, I think it actually should and I wonder why it does not. However, if I do not use autonomous transaction, the outer function seems to try to access the data that I have inserted in the inner function before it is committed, throws a no-data-found-exception, hence a rollback is performed.
davidp 2 said:The outer function will see whatever the inner function has done, without commit or autonomous transaction [...] In PL/SQL, the default commit is COMMIT WRITE NOWAIT, which I think does mean the transaction might not be instantly visible to the outside transaction, because the call returns before the commit really finishes. Yes, that is my notion, too. However, without autonomous transaction the inner function completes without error, then the outer uses the handles returned by the inner function to call the function get_path_geom() which cannot find the handles in the graph-table which raises an exception and causes a rollback.
Let me summarize: The inner function completes fine, without and with autonomous transaction and returns the handle. The inner function commits, if called directly, without and (of course) with autonomous transaction. The outer function does not see the data inserted by the inner function immediately, whether without or with autonomous transaction. If I let the outer function call the inner function twice (4 times, to be specific, but twice for each newly inserted row) from the outer function and do not use autonomous transaction, I get a no-data-found exception. If I let the outer function call the inner function twice and do use autonomous transaction, it works.
I agree with everything that was said about not using autonomous transaction in this case and I still want to solve this the right way. Any ideas are welcome!

Difference between application context and servlet context

HI,
what are the differences between an application context and a servlet context?
Also can any body elaborate on context path and servlet path. To quote servlet spec:
Context path: The path prefix associated with the ServletContext that this
servlet is a part of.
Servlet Path: The path section that directly corresponds to the mapping
which activated this request.Thanks in advance.

Application context and Servlet Context are pretty much interchangeable terms IIRC.
ContextPath == name of your web application
ServletPath == path to the servlet
Given http://localhost:8080/myWebApp/myServlet
contextPath == myWebApp
servletPath == myServlet
A jsp to help you understand this:
Working with server: <%= application.getServerInfo() %> 
Servlet Specification: <%= application.getMajorVersion() %>.<%= application.getMinorVersion() %> 
Sessionid : <%= session.getId() %> 
QueryString: <%= request.getQueryString() %> 
ContextPath: <%= request.getContextPath() %> 
ServletPath: <%= request.getServletPath() %> Cheers,
evnafets

Internal error: exception thrown from the servlet service function (uri=/servlet/auth)

I am getting the follow error in my webserver error log very offen. I am running iPlanet Delegated Administrator 4.5 and iPlanet WebServer 4.1 SP5. Sometimes I have to stop and start the web server because users can no longer authenticate to Delegated Admin. Does anyone know what this means.
Internal error: exception thrown from the servlet service function (uri=/servlet/auth): javax.servlet.ServletException, Stack: javax.servlet.ServletException
at netscape.nda.servlet.NDAAuth.execute(NDAAuth.java, Compiled Code)
at netscape.nda.servlet.NDAServlet.doPost(NDAServlet.java, Compiled Code)
at netscape.nda.servlet.NDAServlet.doGet(NDAServlet.java, Compiled Code)
at javax.servlet.http.HttpServlet.service(HttpServlet.java, Compiled Code)
at javax.servlet.http.HttpServlet.service(HttpServlet.java, Compiled Code)
at com.netscape.server.http.servlet.NSServletRunner.Service(NSServletRunner.java, Compiled Code)"

Hi,
I hope below link will help you.
http://knowledgebase.iplanet.com/ikb/kb/articles/4761.html
Thanks,
Daks.

Passing value from javascript function to servlet

Hello everybody,
i need to pass parameter from javascript function to servlet.
what i wrote is :
function callPopulateServlet(t)
var h =document.NewRequest.services;
var y = t.selectedIndex;
alert(h.options[y].value);
var id=h.options[y].value;
<%session.setAttribute("id",id);%> // am getting error at this point
document.NewRequest.submit();
with this id am quering values from database through servlet.
any body knows plz help me.
thanks,
anil.

this is the error am getting
Stacktrace:
 org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:85)
 org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:330)
 org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:435)
 org.apache.jasper.compiler.Compiler.compile(Compiler.java:298)
 org.apache.jasper.compiler.Compiler.compile(Compiler.java:277)
 org.apache.jasper.compiler.Compiler.compile(Compiler.java:265)
 org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:564)
 org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:299)
 org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:315)
 org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

Exception thrown from the servlet service function (uri=/servlet/auth)

iam getting foll. error when i try logging in to iDA -
[28/Mar/2005:15:39:38] failure (12538): Internal error: exception thrown from the servlet service function (uri=/servlet/auth): java.lang.NullPointerException, Stack: java.lang.NullPointerException
at netscape.nda.servlet.NDAAuth.execute(NDAAuth.java:306)
at netscape.nda.servlet.NDAServlet.doPost(NDAServlet.java:117)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.iplanet.server.http.servlet.NSServletRunner.invokeServletService(NSServletRunner.java:897)
at com.iplanet.server.http.servlet.NSServletRunner.Service(NSServletRunner.java:464)
we're using iplanet messaging server 5.2 with iDA.
we have two webservers one on each nodes where messaging services are running in cluster.
the webmail is running fine.
the webservers are running fine without errors.
i tried shifting mesaging services on to both nodes, but the error persists.
can any one pl. help me ??

Hi,
I hope below link will help you.
http://knowledgebase.iplanet.com/ikb/kb/articles/4761.html
Thanks,
Daks.

Whats the difference between servlet-config.xml ang web.xml???

whats the difference between servlet-config.xml ang web.xml???

web.xml is the standard configuration for all Java EE web modules.
servlet-config.xml appears to be pertinent only for Struts apps.
you don't have to have servlet-config.xml if you don't use Struts, but you've got to have web.xml.
%

Installing and calling a servlet on the web

I have developed a servlet wich communicates with my client software.
I'm using Jbuilder and Tomcat and I have no problem with runnin & debugging the code, but I can't get over this problem:
How do I install the servlet on my web host (wich supports java servlet)?
How do I 'init' the servlet?
Wich address do I have to use for calling it from my client?
Thank you

How do I install the servlet on my web host (wich
supports java servlet)?Download Tomcat from jakarta Apache site. The download will have thre required servlet.jar in "lib" folder under your downloaded folder.
How do I 'init' the servlet?When you call the servlet for the first time, it gets loaded inside the servletcontainer of your server and gets initialized.
Wich address do I have to use for calling it from my
client?simply "http://<web-server-name>/servlet/<servlet-class-name>
Does this help?
>
Thank you

Order of servlet mapping in web.xml

Hello,
is the order of multiple <servlet-mapping> in web.xml important? Or it doesn't matter in which order they are declared?
For example, if i have two controllers, one is
<servlet-name>Faces Servlet</servlet-name>
<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
and the second:
<servlet>
 <servlet-name>FrontController</servlet-name>
 <servlet-class>servlets.FrontController</servlet-class>
</servlet>
and the mapping are:
 <servlet-mapping>
 <servlet-name>FrontController</servlet-name>
 <url-pattern>/jsf/*</url-pattern>
</servlet-mapping>
<servlet-mapping>
 <servlet-name>Faces Servlet</servlet-name>
 <url-pattern>*.jsf</url-pattern>
</servlet-mapping>where /jsf/ contains jsp pages containing jsf components.
is the order important?
And may second question is:
if i call the jsp page test.jsf in /jsf/test.jsp , which controller is responseble? Faces servlet or Frontcontroller?

Here is what the 2.4 specification says on the matter (section SRV.11.1):
>
The path used for mapping to a servlet is the request URL from the request
object minus the context path and the path parameters. The URL path mapping rules below are used in order. The first successful match is used with no further matches attempted:
1. The container will try to find an exact match of the path of the request to the
path of the servlet. A successful match selects the servlet.
2. The container will recursively try to match the longest path-prefix. This is done by stepping down the path tree a directory at a time, using the �/� character as a path separator. The longest match determines the servlet selected.
3. If the last segment in the URL path contains an extension (e.g. .jsp), the servlet container will try to match a servlet that handles requests for the extension. An extension is defined as the part of the last segment after the last �.� character.
4. If neither of the previous three rules result in a servlet match, the container will attempt to serve content appropriate for the resource requested. If a "default" servlet is defined for the application, it will be used.
The container must use case-sensitive string comparisons for matching.
It also notes that in prior versions of the specification these were only a suggestion so if you are on servlet 2.3 or prior, you need to consult the documentation for your container.
So, to answer your questions, no, order in the descriptor is not important.
Also, based on the rules above, using your mappings, any URL starting with /jsf will be handled by FrontController including /jsf/test.jsp and /jsf/test.jsf.

What is Context and queue?

Q.1What is context and queue in graphical mapping?
Q.2What is the difference between context and queue in graphical mapping and how these concepts are useful in mapping?

Hi,
Context Change
Message mapping works internally by using queues
If no further elements are imported at a particular hierarchy level, a Context Change is inserted in the queue
Use node functions to handle changes in the message hierarchy.
Context changes have impact on:
User-Defined Functions
Breaking and inserting of hierarchy levels Manipulation of queues ant contexts
Explicit context selection on source elements and nodes
Using node functions
removeContexts: deletes all context changes of a queue
SplitByValue: insert additional context changes in a queue
Check this link for all details.
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/be05e290-0201-0010-e997-b6e55f9548dd
A tool to display queues:
-Upload or create source xmldocument in test mode
- Right-click on box representing element or function
- Select Show queue
Also check out this link
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/be05e290-0201-0010-e997-b6e55f9548dd
Hope this will help you.
Regards
Aashish Sinha
PS : reward points if helpful

Can i run a servlet without a web.xml file for servlet mapping?

Hello everyone.
The code i want to run compiles and everythink looks ok.
It produces the .class file.
I run Tomcat 4.1 and i build my Web site with Dreamweaver.
I have a form in a page and i want to send the data upon form completion to a database i already have build with MySql.
The database is up and running and the server is set-up ok.
I have changed the port in Tomcat to run on port 80.
The directory i have my site is
Tomcat41\webapps\ROOT\se
and the directory where i keep the servlet class is
Tomcat41\webapps\ROOT\se\WEB-INF\servlet
I have a web.xml file to map the servlet and placed it in
Tomcat41\webapps\ROOT\se\WEB-INF
In the Form action i write action:"/servlets/Classes/GroupRegistration"
and I RECEIVE AN 404 ERROR FROM APACHE.
Somethink is wrong .
The following is the code from the GroupRegistration.java file
and follws the web.xml file.
Please Help.
import java.sql.*;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class GroupRegistration extends HttpServlet
Connection con;
public void doPost (HttpServletRequest req, HttpServletResponse res)
 throws ServletException, java.io.IOException
 handleForm(req, res);
public void init() throws ServletException {
 try{
 /* Loading the driver for the database */
 Class.forName("com.mysql.jdbc.Driver");
 Connection Con = DriverManager.getConnection("jdbc:mysql://localhost/se?user=luser&password=");
 catch (ClassNotFoundException e) {
 throw new UnavailableException("Couldn't load JdbcOdbcDriver");
 catch (SQLException e) {
 throw new UnavailableException("Couldn't get db connection");
 private void handleForm(HttpServletRequest req, HttpServletResponse res)
 throws ServletException {
 //ServletOutputStream out = res.OutputStream();
 //res.setContentType("text/html");
 //Extract the form Data Here
 String group = req.getParameter("GroupNo");
 String Name1 = req.getParameter("Name1");
 String LoginID1 = req.getParameter("LoginID1");
 String Name2 = req.getParameter("Name2");
 String LoginID2 = req.getParameter("LoginID2");
 String Name3 = req.getParameter("Name3");
 String LoginID3 = req.getParameter("LoginID3");
 String Name4 = req.getParameter("Name4");
 String LoginID4 = req.getParameter("LoginID4");
 String URL = req.getParameter("URL");
 String Title2 = req.getParameter("Title2");
 String date = req.getParameter("date");
 String INSERT = "INSERT INTO registration (groupno, name1, loginid1, name2, loginid2, name3, loginid3, name4, loginid4, url, topic, date) VALUES (" + group + "," + Name1 + "," + LoginID2 + "," + Name2 + "," + LoginID2 + "," + Name3 + "," + LoginID3 + "," + Name4 + "," + LoginID4 + "," + URL + "," + Title2 + "," + date + ")";
 PreparedStatement pstmt = null;
 try{
 pstmt = con.prepareStatement(INSERT);
 pstmt.executeUpdate();
 catch (SQLException e) {
 throw new ServletException(e);
 finally {
 try {
 if (pstmt != null)pstmt.close();
 catch (SQLException ignored){
The web.xml file
<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns="http://java.sun.com.xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" version="2.4">
<servlet>
<servlet-name>GroupRegistration</servlet-name>
<servlet-class>GroupRegistration</servlet-class>
</servlet>
<servlet-maping>
<servlet-name>GroupRegistration</servlet-name>
<url-pattern>/myGroupRegistration</url-patern>
</servlet-mapping>
</web-app>
I apreciate your time.
Thanks for any help.

and the directory where i keep the servlet class is
Tomcat41\webapps\ROOT\se\WEB-INF\servletOthers have pointed out that "servlet" should be "classes", but there is another mistake that hasn't been spotted. If you want your servlet to appear in the root context, you should use:
Tomcat41\webapps\ROOT\WEB-INF\classes
If you want your servlet to appear under the /se context, then you should use:
Tomcat41\webapps\se\WEB-INF\classes
and also, in the latter case, your form action should be /se/myGroupRegistration.

What is the exact purpose of Transaction NACE and NAST Table?

Hi All,
What is the exact purpose of Transaction NACE and NAST Table?
Pls help me
Akshitha.

Hi
When a Output type in an apllication doc is configured with a Medium, Partner, Lang and other communication paramters an entry is created in NAST table
so to trigger the output an entry in NAST is compulsory
Output is a link between the Driver Program and the Sapscript,
An output type summarizes messages of the same meaning. It contains parameters that are valid for all its assigned messages, for example appropriate partner functions.
Transmission medium is a medium which the layout will be come out, this may be printout, Fax or Mail
Check this link.
http://help.sap.com/saphelp_nw2004s/helpdata/en/c8/19884743b111d1896f0000e8322d00/content.htm
ex-how to config output type.
You will assign output types using Transaction NACE.
Do the follow steps to assign output type
1)Select Application Type V2 which will have description Shipping.
2)Click on Output types button.
3)Go to change mode by pressing Ctrl+F4.
4)Select one output type which already exists
5)Do Copy As(F6)
6)Give your output type against Output Type field.
7)Under General data Tab, Give Program and Form routine and Save the data.
i think it a work of functional guy but at senior level i think it is not a big deal for abaper.
Check the following documentation
In NACE t-codewe have the application for each one. based on the application output type can be defined, based on output type script and print progrma can be defined.
If suppose data can be read from EDI then we should go for condition records.
So whenever we execute the script first composer checks the output type and then execute the program. in program whenever opn form FM will be populate then script will open first. After that again program till another FM will populate if it then script will populate........like it is cycle proces. Composer does all these things and at last it will submit that output to spool.
Go to the Transaction NACE.
choose the related sub module.. like billing or shipping
doubel click on Output Types
Choose the Output Type for which whcih you wanted your script to trigger
Then select the Output Type and double click on Processing Routine
Then go to create new entries--> Select the Medium (1- print output), then enter your Script and Print Program detls --> Save and come out
Now go to the Transaction (for which you have created the output type)... Issue output--> Select the output type --> Print....
Device Types for SAP Output Devices (Detail Information)
Definition
The device type indicates the type of printer to be addressed. When you define an output device, choose the name of the device type that was defined in the SAP System for your printer model, such as Post2 for a PostScript printer. In the case of frontend printing under Microsoft Windows, you can also use the generic (device-independent) device type SWIN.
The system uses the information in the device type to convert a document from the internal SAP character representation (spool request in OTF or in text format) to a device-specific, print-ready data stream (output request). Since a device type specifies attributes that apply to all devices of a certain model, it can be shared among device definitions. For example, all devices in the SAP spool system that are compatible with Hewlett-Packard LaserJet IIID printers would use the HPLJIIID device type.
You should not confuse the device type with the printer driver. The device type is the total of all attributes of an output device that the SAP System must know to control the output device correctly, such as control commands for font selection, page size, character set selection, and so on. These attributes also include the printer driver that SAPscript/Smart Forms (the SAP form processor) should use for this printer. The SAPscript printer driver that is to be used for devices of this type for output formatting is therefore only an attribute that the device type specifies.
How do I choose the correct device type?
In most cases, the SAP System already provides the appropriate device type for the printer type for the printer model that you want to use.
These standard device types are completely defined and need no modification or extension before you use them in device definitions.
You can also download missing device types from the sapserv server. For a current list of the supported device types, see SAP Note 8928 in the SAP Service Marketplace.
Most printers can be controlled using a generic format, such as PostScript. They can be switched to a mode that is compatible with one of the standard printers for which an SAP device type is available. In this case, a supported model is emulated.
Almost all printers are delivered with Microsoft Windows printer drivers. The system can control these printers with the generic (device-independent) device type SWIN. The Microsoft Windows spool system then performs the processing of the print data.
If the specified device types are not available, and generic device types cannot be used, you must create your own device type or edit a copy of an existing device type. We recommend that only those with specialist knowledge of the SAP Spool System and printer driver code do this. For more information, see Defining a New Device Type .
Attributes of a Device Type
A device type is distinguished by the attributes listed below. If you change an existing device type or create a new device type, you must change at least some of these attributes.
Character set: A character set specifies the codes with which characters must be represented in the print-ready output stream (output request). This code replaces the generic SAP characters set that is used internally by the SAP spool system (spool request).
Printer driver: You can specify different printer drivers for printing SAPscript documents and ABAP lists.
Print controls: Print controls represent printer operations, such as boldface or changing the font size. These print control are replaced by printer-specific commands during the creation of the output request from a spool request.
Formats: Formats specify the format supported by the SAP system. The system differentiates between SAPScript formats (DINA4 and LETTER) and ABAP list formats (X_65_132 = 65 rows/132 columns).
Page format: A page format is the interface between a format and SAPscript. It specifies the paper dimensions with which SAPScript can calculate the row and column lengths.
Actions: Actions are output device-specific commands that are required for the implementation of a format. The action printer initialization, for example, can contain a printer command with which the number of rows on a page is defined. There is a set of actions for every format supported by a device type.
Reward points for useful Answers

Adding servlet entry in web.xml of j2ee engine

Hi ,
I want a servlet to be loaded on startup of the j2ee engine SAP WAS which is basically flex based (MessageBrokerServlet).
The init param for the servlet is not accessible or cannot be initialized in init method of the servlet using the servletconfig object.
This is when the servlet is used as a portal component of type servlet.
So as to load the servlet and the servlet being able to access the init param i would be changing the web.xml of the sap j2ee engine (NW CE 7.1). are there any other effects of the same or is it fine if i just add this param in the web.xml
 <servlet>
 <servlet-name>MessageBrokerServlet</servlet-name>
 <display-name>MessageBrokerServlet</display-name>
 <servlet-class>flex.messaging.MessageBrokerServlet</servlet-class>
 <init-param>
 <param-name>services.configuration.file</param-name>
 <param-value>/WEB-INF/flex/services-config.xml</param-value>
 </init-param>
 <load-on-startup>1</load-on-startup>
 </servlet>

Hi ,
Vivek in case my servlet is part of the Portal Application as PortalComponent how do i define init parameters that can be accessed in the servlet.
The config file would be accessed in the init method of the servlet how do i do that when the servlet is added as PortalComponent in PortalApplication. The servlet config file needs to accessed in t he init method.
The load on startup thing would be taken care of by setting parameter startup = true of application properties.
Regards
Srikumar V

Please explain Context and Occurrences

Hello Experts in XI,
Just i started learning XI but i am getting confussion in this Area Context part and Occurrences concept with clear examples and clear explanation.
Thank u,
santhosh

Hi Santosh,
Please go through these links which clearly explains context and context changes in mapping.....
http://help.sap.com/saphelp_nw04/helpdata/en/35/fb8c4057d5701de10000000a1550b0/content.htm
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/9202d890-0201-0010-1588-adb5e89a6638
Regards,
Madhu

Cannot process an HTTP request to servlet [Faces Servlet] in [wcb] web application

Hi All
l am working on a Wcem 3.0 with Trex with ERP and WAS 7.3.
When I logon to http://<host>:<port>/wcb/index.html url I am able to see wcbuilder_erp & wcbuilder_erp_ume application ids.
But suddenly I am getting The website cannot display the page error message when I access the above mentioned URL.
When I verify the developer log trace it showing as 500 Internal sever error issue.[EXCEPTION] java.lang.VerifyError: Bad return type
In defaultTrace.trc file it is showing as Cannot process an HTTP request to servlet [Faces Servlet] in [wcb] web application exception.
09 10 18:08:56:098#+0530#Error#com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl#
com.sap.ASJ.web.000137#WEC-APP-BF#sap.com/wec~comm~wcb~leanapp#C0000A229CA7094A0000000000001188#2392750000000004#sap.com/wec~comm~wcb~leanapp#com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl#Guest#0##CFAFBF4C38E411E4B4750000002482AE#ffbcbcdd38e611e49d020000002482ae#ffbcbcdd38e611e49d020000002482ae#0#Thread[HTTP Worker [@455349581],5,Dedicated_Application_Thread]#Plain##
Cannot process an HTTP request to servlet [Faces Servlet] in [wcb] web application.
[EXCEPTION] java.lang.VerifyError: Bad return type
Exception Details:
Location: com/sap/wec/tc/core/runtime/jsf/resource/WecExternalContextFactory.getExternalContext(Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;)Ljavax/faces/context/ExternalContext; @17: areturn
Reason: Type 'com/sap/wec/tc/core/runtime/jsf/resource/WecExternalContext' (current frame, stack[0]) is not assignable to 'javax/faces/context/ExternalContext' (from method signature)
Current Frame:
 locals: { 'com/sap/wec/tc/core/runtime/jsf/resource/WecExternalContextFactory', 'java/lang/Object', 'java/lang/Object', 'java/lang/Object' }
 stack: { 'com/sap/wec/tc/core/runtime/jsf/resource/WecExternalContext' }
Bytecode:
 0000000: bb00 0359 2ab6 0004 2b2c 2db6 0005 b700
 0000010: 06b0
 at java.lang.Class.getDeclaredConstructors0(Native Method)
 at java.lang.Class.privateGetDeclaredConstructors(Class.java:2446)
 at java.lang.Class.getConstructor0(Class.java:2756)
 at java.lang.Class.getConstructor(Class.java:1693)
Any help?
Regards
Rami Reddy

Hi Steffen,
Thanks for promt response.
But when I checked with Basis team as of now there are not yet configured TREX, only WCEM components has been configured in WAS 7.3. When they are configuring WCEM components HTTPS protocol not configured.
But for past 2 weeks I am able to see the below screen using http://<host>:<port>/wcb/index.html url.
But now I am getting The website cannot display the page error.
Please clarify me if anything is wrong from my side. And also pl let us know which configurations I have to check for fixing the issue.
Regards,
Rami Reddy

Exact functions of Servlet context and servlet Config inside web container

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