Servlets/XML question

I am trying to use java servlet in IAS 8i to receive XML data sent in the body of http request. I tried to call DOMParser.parse passing it request.getInputStream() or request.getReader(). When debugging it in JDeveloper, both ways hang the web server somewere in socket library.
What am i doing wrong? Is there any documented way to do this operation?

Don4t use servlet.jar of JDeveloper in wrapper.classpath entry. Use original ApacheJserv.jar and jsdk.jar (version 2.0), ej:
wrapper.classpath=/usr/local/jdk1.2/lib/dt.jar
wrapper.classpath=/usr/local/jdk1.2/lib/tools.jar
wrapper.classpath=/usr/local/jdk1.2/lib/jpda.jar
wrapper.classpath=/usr/src/Apache-JServ-1.1/src/java/Apache-JServ.jar
wrapper.classpath=/usr/local/jsdk/lib/jsdk.jar
Regards, Marcelo.

Similar Messages

Question about servlet.xml setting

<?xml version="1.0" encoding="UTF-8"?>

<Server port="8025" shutdown="TEARSDOWN">

<Listener className="org.apache.catalina.core.AprLifecycleListener"/>
<Listener className="org.apache.catalina.mbeans.ServerLifecycleListener"/>
<Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener"/>
<Listener className="org.apache.catalina.storeconfig.StoreConfigLifecycleListener"/>

<GlobalNamingResources>

<Environment name="simpleValue" type="java.lang.Integer" value="30"/>

<Resource auth="Container" description="User database that can be updated and saved" factory="org.apache.catalina.users.MemoryUserDatabaseFactory" name="UserDatabase" pathname="conf/tomcat-users.xml" type="org.apache.catalina.UserDatabase"/>
<Resource name="jdbc/mp" auth="Container"
type="javax.sql.DataSource" driverClassName="oracle.jdbc.driver.OracleDriver"
url="jdbc:oracle:thin:@172.25.43.224:1521:mp"
username="mpuser" password="mp" maxActive="20" maxIdle="10"
maxWait="-1"/>
<Resource name="jdbc/passport" auth="Container"
type="javax.sql.DataSource" driverClassName="com.mysql.jdbc.Driver"
url="jdbc:mysql://218.1.14.134:3306/xmnext_passport?autoReconnect=true"
username="zhouzhijun" password="zhouzhijun*1234567" maxActive="20" maxIdle="10"
maxWait="-1"/>
</GlobalNamingResources>

<Service name="Catalina">

<Connector URIEncoding="utf-8" acceptCount="100" connectionTimeout="20000" disableUploadTimeout="true" enableLookups="false" maxHttpHeaderSize="8192" maxSpareThreads="75" maxThreads="150" minSpareThreads="25" port="8084" redirectPort="8443"/>

<Connector enableLookups="false" port="8009" protocol="AJP/1.3" redirectPort="8443"/>

<Engine defaultHost="localhost" name="Catalina">
<Realm className="org.apache.catalina.realm.UserDatabaseRealm" resourceName="UserDatabase" />

<Realm className="org.josso.tc55.agent.jaas.CatalinaJAASRealm"
appName="app1"
userClassNames="org.josso.gateway.identity.service.BaseUserImpl"
roleClassNames="org.josso.gateway.identity.service.BaseRoleImpl"
debug="1" /> // I am not sure realm can set twice like this?
<Host appBase="webapps" autoDeploy="false" name="localhost" unpackWARs="true" xmlNamespaceAware="false" xmlValidation="false">

<Valve className="org.josso.tc55.agent.SSOAgentValve" debug="9" /> when I set this valve, the tomcat seems running abnormal...
</Host>
</Engine>
</Service>
</Server>
Could you help me to check this file setting? Just check this "servlet.xml". Thank you very much!

<?xml version="1.0" encoding="UTF-8"?>

<Server port="8025" shutdown="TEARSDOWN">

<Listener className="org.apache.catalina.core.AprLifecycleListener"/>
<Listener className="org.apache.catalina.mbeans.ServerLifecycleListener"/>
<Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener"/>
<Listener className="org.apache.catalina.storeconfig.StoreConfigLifecycleListener"/>

<GlobalNamingResources>

<Environment name="simpleValue" type="java.lang.Integer" value="30"/>

<Resource auth="Container" description="User database that can be updated and saved" factory="org.apache.catalina.users.MemoryUserDatabaseFactory" name="UserDatabase" pathname="conf/tomcat-users.xml" type="org.apache.catalina.UserDatabase"/>
<Resource name="jdbc/mp" auth="Container"
type="javax.sql.DataSource" driverClassName="oracle.jdbc.driver.OracleDriver"
url="jdbc:oracle:thin:@172.25.43.224:1521:mp"
username="mpuser" password="mp" maxActive="20" maxIdle="10"
maxWait="-1"/>
<Resource name="jdbc/passport" auth="Container"
type="javax.sql.DataSource" driverClassName="com.mysql.jdbc.Driver"
url="jdbc:mysql://218.1.14.134:3306/xmnext_passport?autoReconnect=true"
username="zhouzhijun" password="zhouzhijun*1234567" maxActive="20" maxIdle="10"
maxWait="-1"/>
</GlobalNamingResources>

<Service name="Catalina">

<Connector URIEncoding="utf-8" acceptCount="100" connectionTimeout="20000" disableUploadTimeout="true" enableLookups="false" maxHttpHeaderSize="8192" maxSpareThreads="75" maxThreads="150" minSpareThreads="25" port="8084" redirectPort="8443"/>

<Connector enableLookups="false" port="8009" protocol="AJP/1.3" redirectPort="8443"/>

<Engine defaultHost="localhost" name="Catalina">
<Realm className="org.apache.catalina.realm.UserDatabaseRealm" resourceName="UserDatabase" />

<Realm className="org.josso.tc55.agent.jaas.CatalinaJAASRealm"
appName="app1"
userClassNames="org.josso.gateway.identity.service.BaseUserImpl"
roleClassNames="org.josso.gateway.identity.service.BaseRoleImpl"
debug="1" /> // I am not sure realm can set twice like this?
<Host appBase="webapps" autoDeploy="false" name="localhost" unpackWARs="true" xmlNamespaceAware="false" xmlValidation="false">

<Valve className="org.josso.tc55.agent.SSOAgentValve" debug="9" /> when I set this valve, the tomcat seems running abnormal...
</Host>
</Engine>
</Service>
</Server>
Could you help me to check this file setting? Just check this "servlet.xml". Thank you very much!

Servlets & XML-RPC Example

Since I am not having any luck on the Java & XML forum (http://forum.java.sun.com/thread.jsp?forum=34&thread=512728&tstart=0&trange=15)
I thought I would try here. Does anyone know of a good example on the web they can point me to that shows XML-RPC with servlets as I cannot find any and the examples dir from the Apache distribution of XML-RPC (which is supposed to have such an example) is MIA. Thanks.

hello,
I am looking for the same servlet xml-rpc example, Have you found it ?
nojkan

Where to ask XML-questions

Hello,
when I have a question about XML, where do I ask?
XML DB issues related to XML DB
XML space for the following subspaces
General XML Discussion of the general XML language, standards (XSLT, XQuery, XMLSchema, etc.) and application management issues, suggestions and tips.
PL/SQL XML Programming PL/SQL programming using XDK and related management issues inside Oracle database server. Any question for XML DB functionality, please post your question in Products -> Database-> XML DB.
XQuery Discussion of Oracle XQuery Technology Preview, W3C XQuery specifications, and JSR 225: XQuery API for Java (XQJ) issues
I think I now have an idea (not that I'm sure about it) where my question will fit best. Now, because there is an explanation of the scope of the space, I don't remember something like this in the old forum. Nevertheless it might be confusing for a new member or one that lacks a certain knowledge about the subtleties:
One step forward everyone who understands the explanation for the PL/SQL XML Programming space!
When I have a question about XQuery, how can I decide whether XQuery is correct or General XML?
Which questions qualify for XML DB and not for any of the others.
We all know that many users are not able to see that SQL questions don't belong into the SQL Developer space, how can we expect that they will find the "correct" forum for XML questions? In the end they will end up in the SQL and PL/SQL space anyhow :-)
Regards
Marcus

My $0.02.
As I recall, the explanation for each forum was at the entry level for each forum and not displayed within the forum itself.
The PL/SQL XML Programming space refers to the Oracle XML Developer Kit. It is maintained by a different team than the XMLDB so the need for a separate space for it makes sense. That said, what it covers is also part General XML and XQuery if you dig into what you can do in the XDK.
Some questions that would qualify for the XML DB space.
Anything related to schema registration or downstream of schema registration. Such as querying/performance/indexes/etc.
Issues parsing XML via using XMLTable (or XQuery, such as the new XQuery update added in 11.2.0.3) (Yes that can conflict)
Storage of data in XMLType columns
I to have always been a bit unclear on the exact division between groups in this XML space. I see the XQuery space as being a subset of the General XML space. I watch all three forums, as they are normally low volume and you never know where a question will pop up. As you have seen, questions often end up in the wrong forum and often General XML gets an influx of questions that should go into the Business Intelligence space as well. There is no good way right now to start a generic post and let the system suggest forums that the post could go into, based on content or software involved. That would be a nice touch for the future.

Web.xml servlet redirection question

Hi everyone;
As you know web.xml file allows you to enter something like this
     <servlet-mapping>
          <servlet-name>application1</servlet-name>
          <url-pattern>/application1</url-pattern>
     </servlet-mapping>
so you can find your application.
As you know it is case sensitive so if a user enters /Application1 it wouldn't be found. I was wondering if i could put a node in there that would redirect requests from Application1 to application.
Any ideas ?
Stev

oh i wasn't aware that i could put multiple nodes in there like this
<servlet-mapping>
<servlet-name>application1</servlet-name>
<url-pattern>/application1</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>application1</servlet-name>
<url-pattern>/Application1</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>application1</servlet-name>
<url-pattern>/APplication1</url-pattern>
</servlet-mapping>
is there a way to simply make this case insensitive and all requests get translated to the lowercase versioN?
Stev

Basic servlet/xml type question

Hi,
I have an existing servlet that reads two numbers from a deployment descriptor (web.xml) but i need to modify it so that it displays all the numbers between the two existing numbers in the D. D.
this is the exisitng servlet:
response.setContentType("text/html");
          PrintWriter out = response.getWriter();
          // Grab the Parameters from the web.xml file
          String fn = getInitParameter("firstnumber");
     String ln = getInitParameter("lastnumber");
out.println("<HTML><HEAD><TITLE>ServletContext Init Params</TITLE></HEAD>");
out.println("<BODY><H1>the numbers are ");
     out.println(fn + " " + ln + "</H1></BODY></HTML>");
any help would be appreciated.
Im pretty much a complete novice,
Regards,
Stephen.

A wee bit 'o cross posting here.
http://forum.java.sun.com/thread.jspa?threadID=713387&messageID=4125474

Jsp,servlet,bean question,please help

The Tomcat Web server set up like this.......
The directory structure is
e:/sampleapp/WEB-INF/classes
/lib
And the web.xml is in the WEB-INF for the use of ay potential servlet.
The basic understanding is that all the .java files go into the WEB-INF directory and the .class files go into the classes directory.
All the .jsp files go into the sampleapp directory.Till here is correct I feel.
Now for my qustion......
I plan to use jsp,servlet and beans for a potential web application...,where do all these files go?,just the same as above or is there a difference.
Hope that I have given a reasonable explaination to my question.
Thanks for any replies
AS

All of your compiled servlet and java bean (java
classes in general) will be placed into the following
directory (under a directory structure matching the
java package they are in):
e:/sampleapp/WEB-INF/classesAll of your .jar files that are used as libraries (not
your .jar files for applets):
e:/sampleapp/WEB-INF/libAll of the rest of your JSP files, javascript files,
HTML files, JAR files, images files, etc. will go into
the following directory:
e:/sampleappYou must make sure you put your sampleapp directory
where tomcat can load it. Or use the admin tool to
load it. If you make a .WAR file with a corresponding
web.xml file in it, it will simplify loading it into
tomcat. It also will help you do your servlet
mappings, etc. I hope this helps.Thanks for your timely response.To add to it,let me tell you.
The <b>bean</b> files are put into a package right,so they should be put into the WEB-INF/classes/<package name>
What about The <b> servlet </b> files...... they are just put into the WEB-INF/classes/ directory????
Kindly let me know.
Thanks
AS

Servlet - xml data storage best practice

Hello - I am creating a webapp that is a combination of servlets and jsp. The app will access, store and manipulate data in an xml file. I hope to deploy and distribute the webapp as a war file. I have been told that it is a bad idea to assume that the xml file, if included in a directory of the war file will be writeable, as the servlet spec does not guarantee that war are "exploded" into real file space. For that matter, they do not guarantee that the file space is writeable at all.
So, what is the best idea for the placement of this xml file? Should I have users create a home directory for the xml file to sit in, so it can be guaranteed to be writeable? And, if so, how should I configure the webapp so they it will know where this file is kept?
Any advice would be gratefully welcomed...
Paul Phillips

Great Question, but I need to take it a little further.
First of all, my advice is to use some independent home directory for the xml file that can be located via a properties file or the like.
This will make life easier when trying to deploy to a server such as JBoss (with Catalina/Tomcat) which doesn't extract the war file into some directory. In that case you would need to access your XML file which would be residing inside a war file. I haven't tried this (sounds painful) but I suspect there may be security access problems when trying to get the FileOutputStream on a file inside the war??
Anyway.... so I recommend the independent directory away from the hustle and bustle of the servers' directories. Having said that..... I have a question in return: Where do you put a newly created (on the fly) jsp that you want accessed via your webapp?
In Tomcat its easy... just put it in the tomcat/webapps/myapp directory, but this can't be done for JBoss with integrated Tomcat (jboss-3.0.0RC1_tomcat-4.0.3).
Anyone got any ideas on that one?

JSP/Servlets & XML - suggestion needed

Hi everyone,
I don't have any coding issues, I'm really just looking for some help on deciding how to go with a project I want to make. First off, I wrote a Java library that builds messages in a special format. I wanted to come up with a pretty frontend for it, so I decided I'd try my hand at a webapp since I've been interested in them for a while. So far my web app consists of jsps, servlets and my library.
At this point I'd like to add the ability for the webapp to store created messages in an XML file (read / write). The XML library I want to use is JAXB. I have it setup to read/write my XML file fine in a test servlet, however I'd like to implement this in a kind of "best practice" approach. So I'm looking for suggestions on how I should do this.
A few of my ideas:
1) Use a jsp page to call a "MessagesBean" which retrieves my data from my xml file. I could then format this nicely in the jsp page. The problem with this however is that I can't find any way to open a file relative to the webapp from within a Bean. ie. when I try to open "messages.xml", I can see from tomcat errors that it attempts to open it in tomcats bin folder (or if i run from within eclipse, eclipses bin folder). I know I could get around this by using an absolute path but I want this to be portable. Any suggestions?
2) To solve the above problem I found "getServletContext().getRealPath("")" in the Servlet API. Using this method I'm able to open my XML file relative to my webapp. The only issue I have here is that I'm now using a servlet to display the page, making it harder for me to format the output.
I'm very new to JSP/Servlets/etc so I really don't know how I should be doing this. I'm just trying to make sure I don't start out on the wrong foot. Can someone please give some suggestions on what I could do?
Cheers.

I suggested not putting business logic in the servlet, but instead instansiating a business logic object in the servlet and calling one of its functions to do the work.
There is nothing wrong with putting the business logic in the servlet on first try. Just later on, you might want to refactor the code to more conform to the above.
In your code, you mentioned that the MessagesBean in the JSP page doesnt seem to call the constructor. The <useBean> tag first looks to
see if the object is in request scope. If it is, it uses it (doesnt call constructor). If its not, it creates its own (calls constructor). You should always
have it in request scope ready for useBean to use.
I think this line:
<jsp:useBean id="messages" class="my.package.MessagesBean" />
should be changed to something like:
<jsp:useBean id="messages" class="my.package.MessagesBean" scope="request" />
The MessagesBean should only have get/set methods to get data out of its object (its a very simple object that holds data). None of its functions
should perform business logic such as hitting the database.
Therefore these items in your JSP page should be in the servlet or business logic:
messages.setPath( getServletContext().getRealPath("") ); // Pass in relative PATH
messages.processXML(); // Process XML file
While this should be in your JSP:
java.util.List<TEXT> TextFiles = messages.getTEXTFiles(); // Return a List of TEXT objects
Question: The JSP calls my Bean "MessagesBean". It then passes in the current relative path. This seems fairly hackish to me, is there a better way to give the relative path to my bean?
Answer: Hard code the relative path to the JSP page in the servlet or business logic. There is no need for the JSP page to pass its path back to the servlet or business logic. Your servlet
'knows' the path to all the JSP pages it needs to dispatch to.
The best way to learn MVC is to continually refactor your code until it looks more and more like MVC (separation of concerns).

Follow-up Basic XML Questions

First, I apologize to the board in advance because I started a very similar topic already. I know this can be annoying but I think I'm worried that people will ignore my original post because there was already a reply to it. I added 2 follow up posts and nobody has responded. It could well be because they feel that my questions were already answered. After reading and re-reading the person who replied to my original question I did start to pick up many answers from his post. However, I guess I have some follow-up questions and felt compelled to start a new thread to get this "out there" again. I promise to try not to do this again and, once again, I apologize for starting multiple similar topics. Anyway, here goes my follow-up questions...
I'm pretty new to XML but I've been reading an article on msdn about it and listed some code from the article at the bottom of this post.
I have some questions about namespaces. From what I understand, a namespace is a unique identifier (it's a string). The thing that's bugging me though is this line...
<x:transform version='1.0' xmlns:x='http://www.w3.org/1999/XSL/Transform'>
Maybe I'm wrong, but my gut feeling is that this particular namespace has a special meaning (in other words, it goes beyond being just a unique identifier). Am I correct on this?
From other stuff I've read I have another gut feeling that there are certain namespaces that somehow have schemas attached to them automatically. I've read that a schema can be "namespace aware". So, as a guess at the answer to my original question - are there certain namespaces that are something like "keywords" (similar to the concept of "keywords" in programming languages)? And is the "big deal" about these particular namespaces that they have schema definitions attached to them somehow? Any help would be GREATLY appreciated!
EXAMPLE CODE FROM THE MSDN SITE:
<x:transform version='1.0'
xmlns:x='http://www.w3.org/1999/XSL/Transform'
>
<x:template match='/'>
<hello_world/>
</x:template>
</x:transform>

this particular namespace has a special meaning .... Am I correct on this?Yes, that namespace has a "meaning", but only to a program that implements the XSLT language. Likewise a "purchase order" namespace has a "meaning", but only to a program that is designed to read XML with that namespace and convert it to purchase orders in somebody's accounting system. (Just as the codes 'A', 'C', and 'D' could mean 'Add', 'Change', and 'Delete' to a program that maintains a database.) Similarly element names have a "meaning", but only to a program that is designed to understand that "meaning". A Java program has a "meaning" but a COBOL compiler doesn't understand that "meaning".
From other stuff I've read I have another gut feeling that there are certain namespaces that somehow have schemas attached to them automatically.Not that I've ever heard of.

XML Question for web.xml file for LiteWebServer

Hi,
I have no clue of wut tags are required in the web.xml file.
Currently the following code is in my web.xml file and i am trying to run servlets that are located under web-inf/*.class
Pls tell me wuts wrong....
Do i need those mime-mapping tags, session and welcome tags.......... ?
Right now i just want those 2 servlets to work
And wut is this encoding ="UTF-8" in the first line of the xml file. Wut does that do... ? ARe there any others
Any help would b greatly appreciated
Thanks
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app id="WebApp_1">
<display-name>PDMPortal</display-name>
<session-config id="SessionConfig_1">
<session-timeout>60</session-timeout>
</session-config>
<mime-mapping id="MimeMapping_1">
<extension>htc</extension>
<mime-type>text/x-component</mime-type>
</mime-mapping>
<welcome-file-list id="WelcomeFileList_1">
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>HelloWorld</servlet-name>
<servlet-class>HelloWorld</servlet-class>
</servlet>
<servlet>
<servlet-name>HelloWorldExample</servlet-name>
<servlet-class>HelloWorldExample</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>HelloWorld</servlet-name>
<url-pattern>HelloWorld</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>HelloWorldExample</servlet-name>
<url-pattern>HelloWorldExample</url-pattern>
</servlet-mapping>
</web-app>

Try putting your servlets in the WEB-INF\classes directory.

Web.xml question

Hi Guys!
I ran into a small problem.
Im using the struts tiles framework to redesign a shopping cart .
In the new framework,there are multiple websites(user interface tiles) that use the same servlets at the back end to process the requests. The control is passed back to the website that called the commonly shared servlets once the computations are done.The servlets, the various websites that use the servlets all reside on the same server and are a part of the same project.
The whole project shares a common web.xml file.
I was just wondering if each of the tiles can have thier own web.xml so that the servlet context can be loaded from them.
The directory structure is like this
Tiles Framework
-Servlet Source
-web.xml
-tiles (folder)
---tile1(folder...contains the 1st website)
---tile2
---tile 3
The reason being that in the older version of the shopping cart, the web.xml was used to load specfic contexts in the servlets.
Is it possible that wach of the tiles has its own web.xml ?
if so, does it require any configuration in the overall project.
Thanks.

If I understand the web.xml file correctly, there should only be one per project. But if it's just a matter of loading props for each of the tiles, can't you just have a different properties file for each tile?
I can't imagine a situation where you'd be required to have multiple web.xml files within the same project. Can you explain why you can't just have several regular property files & read from them instead?

XSLT, XML Question???

I've recently found that I can use XSLT to transform XML docs into SQL using x-path... Is there any documentation out there referencing a transformation using x-query???? I've searched the web but have not seem much on this...
Any direction would be greatly appreciated.

XSLT doesn't use XQuery. So it's not surprising you haven't found much documentation about using XQuery in XSLT. You might want to direct questions like this one to an XSLT forum rather than a Java forum.

Global variable in servlet & DBPooling questions

Hello guys,
I used to develop PHP/ASP, and am new to servlet. I have been searching around for a solution ...
With Php, we can get the reference of a global variable in any classes->functions...
How do I do this with servlet ?
And second..I have developed the DB class as below... I set the datasource to be static, so it initializes only once. Is it a good idea? How would you like to improve this class? any comments?
package shop.database;
import javax.sql.DataSource;
import java.sql.*;
import org.apache.commons.dbcp.BasicDataSource;
import org.apache.log4j.Logger;
import shop.admin.exception.GeneralException;
public class DdManager {
     static protected Logger logger = Logger.getLogger(DdManager.class);
     private String userName = "root";
private String password = "";
private String hostName = "jdbc:mysql://localhost:3306/shop";
private String database="shop";
     static private DataSource ds;     // set this to be static so all threads share the same job in JVM
     private Statement stmt;
     private Connection conn;
     private ResultSet rs;
     private CallableStatement cs;
public DdManager() {}
* setup the data source and return it
     public static DataSource getDataSource(
          String sDrvName,
          String sUserName,
          String sPwd,
          String connectURI) {
          BasicDataSource ds = new BasicDataSource();
          ds.setDriverClassName( sDrvName );
          ds.setUsername( sUserName );
          ds.setPassword( sPwd );
          ds.setUrl( connectURI );
          ds.setMaxActive( 15 );
          ds.setMaxIdle( 10 );
          ds.setMaxWait( 10000 ); // 10 seconds
          return ds;
     * static init of the class
     * this class is will be called only once to initialize the DataSource
     static {
          try {
               Class.forName( "com.mysql.jdbc.Driver" );
               ds = getDataSource(     "com.mysql.jdbc.Driver",
                                        "root",
                                        "jdbc:mysql://localhost:3306/shop" );
               if (ds == null) {
                    String msg = "Connection Pool error";
                    logger.error(msg);
                    throw new GeneralException(msg);
               logger.info("DataSource has been initialized");
          } catch(Exception exception) {
               logger.error(exception.toString());
               try {
                    throw new GeneralException(exception.toString());
               } catch (GeneralException e) {
                    logger.error(e.toString());
     * get the connection from the pool (DataSource)
public void openConnection() throws GeneralException {
try {
     BasicDataSource bds = (BasicDataSource) ds;
     logger.info("NumActive: " + bds.getNumActive() + ", " + "NumIdle: " + bds.getNumIdle());
conn = ds.getConnection();
logger.info("Connection of " + database + " has been established");
} catch(Exception exception) {
     logger.error(exception.toString());
     throw new GeneralException(exception.toString());
* close the connection will actually return the connection to the pool (Must)
public void closeConnection() throws GeneralException {
     initResource();
try {
     if (conn != null){
               conn.close();
               logger.info("Connection of " + database + " has been closed");
} catch(SQLException exception) {
     logger.error(exception.toString());
     throw new GeneralException(exception.toString());
* prepare the calling stmt
public void prepareProcedure(String callStatement) throws GeneralException {
     initResource();
try {
     cs = conn.prepareCall(callStatement);
} catch(SQLException exception) {
     logger.error(exception.toString());
     throw new GeneralException(exception.toString());
* set the pass-in parameter for "String"
public void setParameter(int position, String parameter) throws GeneralException {
try {
     cs.setString(position, parameter);
} catch(Exception exception) {
     logger.error(exception.toString());
     throw new GeneralException(exception.toString());
* set the pass-in parameter for "Integer"
public void setParameter(int position, int parameter) throws GeneralException {
try {
     cs.setInt(position, parameter);
} catch(Exception exception) {
     logger.error(exception.toString());
     throw new GeneralException(exception.toString());
* execute the procedure and return the resultset
public ResultSet execProcedure() throws GeneralException {
try {
     rs = cs.executeQuery();
} catch(SQLException exception) {
     logger.error(exception.toString());
     throw new GeneralException(exception.toString());
return rs;
* close the statment and resultset
     private void initResource() throws GeneralException {
     try {
          if(rs != null) {
               rs.close();
          if(stmt!= null) {
               stmt.close();
          logger.info("Statement & Resultset have been free");
     } catch(Exception exception) {
     logger.error(exception.toString());
     throw new GeneralException(exception.toString());
Thanks mates!
myy

Thanks Saish,
Your response is really appreciated. Sorry about that
as i didnt know there is 'code' formatting button,
and I will look into the Singleton pattern.
As I'm still in the learning stage. Therefore, i
still have a lot of thing do not understand.
... use it in a method signature ...What is "a method signature" ?
A method signature is basically the method's parameters, return value, name and any access or other modifiers. The following is a method signature:
static final public void main(final String[] args)Between the braces of the method body is the implementation (or as I already alluded to, the method body).
Consider using an already-developed connection poolimplementation, such as Jakarta Commons DBCP ...
I'm trying to implement the Jakarta DBCP. Did I go
into the wrong way?
Sorry, did not read the imports. Yes, you are. However, I am confused about what you are trying to implement. You have a static method getDataSource(). You also have a static variable 'ds'. Use one or the other. I would be that there are seemingly random errors cropping up based on whether you remember to call getDataSource() or not.
You do not, generally, want the data source to be static. Multiple threads might use the class. And if there is only a static data source, you will either need to synchronize the methods that use the data source (resulting in a scaling bottleneck) or not synchronize them (which will totally destroy any concept of a logical unit of work or database transaction).
.. A static datasource, as in your class, can onlysafely be used by one thread at a time, potentially
introducing scaling bottlenecks (or race conditions)
in your system ...
So, you mean there is no need for the DataSource to
be static ?
No, in fact, IMO, it should not be. That is why you are pooling. Use instances. The pool will manage the connections and their availabilty for you.
Why are you throwing GeneralException everywhere?Here's a question: can someone using your class (a
caller) realistically be expected to handle a
database exception?
When there is a database error, I just want to stop
the process and redirect the user to an error page. I
will look into the unchecked exceptions. Thanks.
Unchecked exceptions do not need to be declared in a method signature or caught within the method body. Checked exceptions do. As such, an added benefit is that unchecked exceptions de-clutter your code.
In your initResources() method, what happens if theclose() on ResultSet throws an exception
Oh, yes. I'm so stupid.
Now I only have ...
     private static DataSource ds;     // set this to
be static so all threads share the same obj in JVM
     private Connection conn;
     private CallableStatement cs;
private void initResource() throws GeneralException
n {
     try {
          if(cs != null) {
               cs.close();
logger.info("CallableStatement has been
as been free");
     } catch(Exception exception) {
     logger.error(exception.toString());
throw new
throw new GeneralException(exception.toString());
You still have issues.
public void initResources() {
   if (rs != null) {
     try { rs.close(); } catch (SQLException ignore) { ignore.printStackTrace(); }
   if (stmt != null) {
     try { stmt.close(); } catch (SQLException ignore) { ignore.printStackTrace(); }
}Normally, this type of method would not be called initResources() but rather closeResources() or freeResources(). It would be called from within the 'finally' block of another method using the CallableStatement or ResultSet.
This is really is problem, would you mind to tell me
how to handle this(close the connection) if the
close() on either CallableStatement or Resultset
throws an exception ?
See above. Simply log the exception (there is usually nothing meaningful you can do if a close() fails, and it is up to you as a developer if this is an error or just a warning). Another option is to 'chain' exceptions. In your own exception, add a method 'addException(Throwable)'. This would add another exception to a List of exceptions. When you print the stack trace, iterate through the chained exceptions to print them all out. One place where I find this useful is rollback() code. If the original SQL statement fails AND the rollback fails, I definitely want to see that rollback() exception as well in my logs.
The DB thing makes me headache. What I actually
wanted is a solution for:
Let say I have a class "HelloAction.class" contains
the code:
public ActionForward XXX() {
     DbManager DB = new DBManager();
     ... do some DB thing here...
     SecondClass SC = new SecondClass();
     SC.doSomeOtherDbThing();
     ... do something else...
     ThirdClass TC = new ThirdClass();
     SC.doMoreOtherDbThing();
}There are some functions in SecondClass.class and
ThirdClass.class that will need database connection.
I consider 'global variable' is because I want these
two classes are able to use the same
connection(DbManager) from the function -
ActionForward XXX().
What is the best way to implement the above situation
(sharing the same connection in different classes &
sub-classes?
I also just realize that the problem of multi-threads
with these two class variables..
     private Connection conn;
     private CallableStatement cs;Really headache. I really appreciate any comments.
Thanks.
- myyPass the Connection or DataSource to each method or constructor. Call commit() or rollback() from the method that created the transaction.
- Saish

XMLTYPE variable converting to XML (Question)

Friends,
I am stuck on an error and cannot find a way out. Please help. I know it's a long question but a very simple answer to many smart people here. I am just lost and need your help. (I am new to SOA so bear with me)
I have a BPEL process which invokes a PL/SQL API which returns the XMLTYPE output which has the XML data. In order to convert the XMLTYPE to normal XML I do following :-
- I added a Java embed activity in BPEL with following code (Invoke_new_get_customer_order_info_OutputVariable','OutputParameters','/ns2:OutputParameters/ns2:X_CUSTOMER_ORDER_INFO_XML is the XMLTYPE)
(responsePayoad is string variable)
try{
Node node = (Node)getVariableData("Invoke_new_get_customer_order_info_OutputVariable','OutputParameters','/ns2:OutputParameters/ns2:X_CUSTOMER_ORDER_INFO_XML");
Node childNode = (Node) node.getFirstChild();
StringWriter writer = new StringWriter();
Transformer transformer = TransformerFactory.newInstance().newTransformer();
transformer.transform(new DOMSource(childNode), new StreamResult(writer));
String xml = writer.toString();
String nsXML = xml.replaceFirst("<FetchCustomerInfoResponse","<FetchCustomerInfoResponse xmlns=\"http://xmlns.djoglobal.com/OrderTracking/CustomerInfo\" ");
setVariableData("responsePayload",nsXML);
addAuditTrailEntry("XML with Namespace: " + nsXML);
} catch(Exception e){
addAuditTrailEntry(e);
System.out.println("Namespace injection failed due to : " + e);
After above I have ASSIGN activity where I use parsexml function on the "responsePayload" variable to assign to a variable of type element which refers to following xsd. This is where I get an "internal xpath error" during runtime which I cannot resolve.
XSD of the element variable refering to "FetchCustomerInfoResponse" element
<?xml version="1.0" encoding="windows-1252" ?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns="http://www.example.org"
targetNamespace="http://xmlns.djoglobal.com/OrderTracking/DJOFetchCustomerOrderInfo"
elementFormDefault="qualified">
<xsd:element name="FetchCustomerInfoResponse">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="DJO_ONT_ACCOUNT_ORDERS">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="DJO_ONT_ACCOUNT_ORDER" maxOccurs="unbounded">
<xsd:complexType>
<xsd:attribute name="ordered_date" type="xsd:string"/>
<xsd:attribute name="cust_po_number" type="xsd:string"/>
<xsd:attribute name="order_number" type="xsd:integer"/>
<xsd:attribute name="header_id" type="xsd:integer"/>
</xsd:complexType>
</xsd:element>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
</xsd:schema>
XML returned in the XMLTYPE from the PL/SQL API :-
<Invoke_new_get_customer_order_info_OutputVariable><part name="OutputParameters" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<OutputParameters xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.oracle.com/pcbpel/adapter/db/APPS/XXDJO_ONT_ORDER_TRACKING_WS/GET_CUSTOMER_ORDER_INFO_XML/"><X_CUSTOMER_ORDER_INFO_XML>
<FetchCustomerInfoResponse xmlns="">
<DJO_ONT_ACCOUNT_ORDERS>
<DJO_ONT_ACCOUNT_ORDER ordered_date="24-APR-12" cust_po_number="PO1" order_number="123456" header_id="7777777"/>
<DJO_ONT_ACCOUNT_ORDER ordered_date="19-APR-12" cust_po_number="PO2" order_number="4545454" header_id="888888"/>
<DJO_ONT_ACCOUNT_ORDER ordered_date="09-APR-12" cust_po_number="PO3" order_number="56565656" header_id="999999"/>
</FetchCustomerInfoResponse>
</X_CUSTOMER_ORDER_INFO_XML>
</OutputParameters></part></Invoke_new_get_customer_order_info_OutputVariable></messages>
Any help is greatly appreciated as this is driving me nuts.
Thanks

Few modifications,
1. Initialize your int count to 0, int count=0;
2. Write count++; as the first statement in your for loop. 3. Remove count++; at the bottom.
4. Add a hidden field to your form (after submit button, but before your </form> tag)
<input type="hidden" name="qCount" value="<%=count%>">
Now use this code,
writeXML.jsp
<%
int qCount = Integer.parseInt(request.getParameter("qCount"));
String home ="C:\\Tomcat\\FYProject\\lib\\";
String filename = request.getParameter("file");
String extension = ".xml";
String filePath = home + filename + extension;
BufferedWriter bw = new BufferedWriter(new FileWriter(filePath,true));
bw.write("<mc_QuestionType>");
bw.newLine();
for(int count=0;count<qCount;count++) {
     String Tquestion = request.getParameter("questionText"+count);
     String answer1 = request.getParameter("choice_1"+count);
     String answer2 = request.getParameter("choice_2"+count);
     String answer3 = request.getParameter("choice_3"+count);
     String answer4 = request.getParameter("choice_4"+count);
     String Canswer = request.getParameter("cAnswer"+count);
     bw.write(" <questionText>" Tquestion "</questionText>");
     bw.newLine();
     bw.write(" <choice>" answer1 "</choice>");
     bw.newLine();
     bw.write(" <choice>" answer2 "</choice>");
     bw.newLine();
     bw.write(" <choice>" answer3 "</choice>");
     bw.newLine();
     bw.write(" <choice>" answer4 "</choice><br>");
     bw.newLine();
     bw.newLine();
     bw.write(" <answer>" Canswer "</answer>");
     bw.newLine();
     bw.write("</mc_QuestionType>");
     bw.close();
%>Hope this works.
Sudha

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