Exercise problems for java

1)Hi. i was trying to find some exercises on writing programs in java. i wanted to see how much i have learned about this language. i searched on google to see if they have exercise problems like for eg
write a program in java that reads a data file and sort the file in ascending order.
any help will be really appreciated.
2) any applet books available online ?

i google and can't find anything(google, ask, yahoo)
Thanks alot for that site. Looks very interesting. from basic to advance but what if i cannot debug a program after several of hours ? i dont have to use the forums all the time. i was wondering if i can get a site with java questions and solutions also in java if i get stuck.
Message was edited by:
fastmike

Similar Messages

Installation problem for Java EE 5 SDK Update 2

Hi ,
I have jdk1.5.0_12 (J2SE) installed on my Windows XP. Now i am trying to install J2EE on my machine.I tried to install it twice but it comes to a halt after completing 45% at the same jar file. Following is the link which shows it comes to a halt.
http://img141.imageshack.us/my.php?image=j2eeinstallhangupav8.png
Also I wanted to know if I uninstall the J2SE and then install only J2EE will that be fine.Because I believe J2EE is a superset of J2SE ?
Thanks in advance.

For the difference between Java EE and Java SE read here:
http://java.sun.com/javaee/5/docs/firstcup/doc/p3.html
For the installation problem, I don�t know how to help you... maybe here you can find some ideas:
http://forum.java.sun.com/thread.jspa?threadID=738559
Andrea

A small Java Problem for java Experts

Hi Guys...
I have a small problem with my program...
Tha program I am using consist of several frames where one invokes the other in row.
These are the classes I am using:
the FIRST class://THIS CLASS IS NOT COMPLETE
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
* LabelDemo.java is a 1.4 application that needs one other file:
* images/middle.gif
public class CSVloader extends JPanel implements ActionListener {
     ImageIcon icon ;
     JLabel label;
JButton theButton1;
JButton saveButton;
JButton displayButton;
JButton displayStyleButton;
JFileChooser fc;
final boolean shouldFill = true;
final boolean shouldWeightX = true;
public CSVloader() {
GridBagLayout gridbag = new GridBagLayout();
GridBagConstraints c = new GridBagConstraints();
setLayout(gridbag);
if (shouldFill) {
//natural height, maximum width
c.fill = GridBagConstraints.HORIZONTAL;
theButton1 = new JButton("Choose source File");
theButton1.addActionListener(this);
if (shouldWeightX) {
c.weightx = 0.5;
c.gridx = 0;
c.gridy = 0;
gridbag.setConstraints(theButton1, c);
add(theButton1);
displayStyleButton = new JButton("CSV Display style");
displayStyleButton.addActionListener(this);
c.gridx = 0;
c.gridy = 2;
gridbag.setConstraints(displayStyleButton, c);
add(displayStyleButton);
displayButton = new JButton("Display");
displayButton.addActionListener(this);
c.gridx = 1;
c.gridy = 0;
gridbag.setConstraints(displayButton, c);
add(displayButton);
saveButton = new JButton("Save");
saveButton.addActionListener(this);
c.gridx = 0;
c.gridy = 1;
gridbag.setConstraints(saveButton, c);
add(saveButton);
icon = new ImageIcon("c:/applets/CSVlogo.gif");
//Create the first label.
label = new JLabel(icon);
c.ipady = 45; //make this component tall
c.weightx = 0.0;
c.gridwidth = 1;
c.gridx = 1;
c.gridy = 1;
gridbag.setConstraints(label, c);
add(label);
fc = new JFileChooser();
public Dimension getDimension(int hight, int width) {
Dimension theDimension = new Dimension(hight,width);
return theDimension;
public void actionPerformed(ActionEvent e) {
//Handle open button action.
if (e.getSource() == theButton1) {
int returnVal = fc.showOpenDialog(CSVloader.this);
if (returnVal == JFileChooser.APPROVE_OPTION) {
File file = fc.getSelectedFile();
//This is where a real application would open the file.
//Handle save button action.
} else
if (e.getSource() == displayButton) {
     try {
Runtime.getRuntime().exec("cmd /c start " + "c:\\applets\\displayData.html");
catch(IOException io)
System.err.println("Caught IOException: " +
     io.getMessage());
}else
if (e.getSource() == displayStyleButton)
JFrame.setDefaultLookAndFeelDecorated(true);
//Create and set up the window.
JFrame frame = new JFrame("Display Style");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create and set up the content pane.
DisplayStyle newContentPane = new DisplayStyle();
newContentPane.setOpaque(true); //content panes must be opaque
frame.setContentPane(newContentPane);
//Display the window.
frame.pack();
frame.setVisible(true);
else
if (e.getSource() == saveButton) {
     int returnVal = fc.showOpenDialog(CSVloader.this);
if (returnVal == JFileChooser.APPROVE_OPTION) {
File saveFile = fc.getSelectedFile();
//This is where a real application would open the file.
public static void main(String[] args) {
//Make sure we have nice window decorations.
JFrame.setDefaultLookAndFeelDecorated(true);
//Create and set up the window.
JFrame frame = new JFrame("LabelDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create and set up the content pane.
CSVloader newContentPane = new CSVloader();
newContentPane.setBackground(Color.WHITE);
newContentPane.setOpaque(true);
frame.setContentPane(newContentPane);
//Display the window.
frame.pack();
frame.setVisible(true);
// Runtime.getRuntime().exec("cmd /c start " + "....\\docs\\index.html");
this is the SECOND class:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class DisplayStyle extends JPanel implements ActionListener{
     public static final int FIRST_OPTION = 0;
     public static final int SECOND_OPTION = 1;
     public static final int THIRD_OPTION = 2;
     public static final int THE_BUTTON_OPTION =3;
public static final int ERROR = -1;
     public int selectedOption = ERROR;
     static String table = "Table";
     static String tableNoBorders = "Table without Borders";
     static String highlightedTable = "Highlighted Table without Borders";
     public JRadioButton theTable;
     public JRadioButton theTable2;
     public JRadioButton theTable3;
     public JButton theButton;
     public String theName;
     public DisplayStyle ()
     theTable = new JRadioButton(table);
     theTable.setActionCommand(""+ FIRST_OPTION);
     theTable.addActionListener(this);
     theTable.setMnemonic(KeyEvent.VK_B);
theTable.setSelected(true);
theTable2 = new JRadioButton(tableNoBorders);
theTable2.setActionCommand(""+ SECOND_OPTION);
     theTable2.addActionListener(this);
     theTable2.setMnemonic(KeyEvent.VK_B);
theTable3 = new JRadioButton(highlightedTable);
theTable3.setActionCommand(""+ THIRD_OPTION);
     theTable3.addActionListener(this);
     theTable3.setMnemonic(KeyEvent.VK_B);
theButton = new JButton("OK");
theButton.setActionCommand(""+ THE_BUTTON_OPTION);
theButton.addActionListener(this);
     ButtonGroup group = new ButtonGroup();
group.add(theTable);
group.add(theTable2);
group.add(theTable3);
JLabel theLabel = new JLabel("Choose the style of Display");
JPanel radioPanel = new JPanel(new GridLayout(0, 1));
radioPanel.add(theLabel);
radioPanel.add(theTable);
radioPanel.add(theTable2);
radioPanel.add(theTable3);
radioPanel.add(theButton);
add(radioPanel, BorderLayout.LINE_START);
     public void actionPerformed (ActionEvent e) {
     if(e.getSource() == theButton)
     JFrame.setDefaultLookAndFeelDecorated(true);
//Create and set up the window.
JFrame frame1 = new JFrame("The Format");
frame1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Formats newFormat = new Formats();
newFormat.setOpaque(true); //content panes must be opaque
frame1.setContentPane(newFormat);
//Display the window.
frame1.pack();
frame1.setVisible(true);
     selectedOption = Integer.parseInt(e.getActionCommand().trim());
     public DisplayStyle getInstance(){
          return this;
this is the THIRD class:
mport java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Formats extends JPanel implements ActionListener{
     public static final int FIRST_OPTION = 0;
     public static final int SECOND_OPTION = 1;
     public static final int THIRD_OPTION = 2;
     public static final int FOURTH_OPTION = 4;
     public static final int THE_BUTTON_OPTION =3;
public static final int ERROR = -1;
     public int selectedOption = ERROR;
     static String standardFormat = "Date first";
     static String timeFirstFormat = "Time First";
     static String typeFirstFormat = "Type of call first";
     static String extFirstFormat = "Extension first";
     public JButton theButton;
     public JRadioButton theStandardButton1 ;
     public JRadioButton theTimeButton;
     public JRadioButton theTypeButton;
     public JRadioButton theExtButton ;
     public Formats()
theStandardButton1 = new JRadioButton(standardFormat);
     theStandardButton1.setMnemonic(KeyEvent.VK_B);
theStandardButton1.setSelected(true);
     theTimeButton = new JRadioButton(timeFirstFormat);
     theTimeButton.setMnemonic(KeyEvent.VK_B);
theTypeButton = new JRadioButton(typeFirstFormat);
     theTypeButton .setMnemonic(KeyEvent.VK_B);
theExtButton = new JRadioButton(extFirstFormat);
     theExtButton.setMnemonic(KeyEvent.VK_B);
     ButtonGroup group = new ButtonGroup();
group.add(theStandardButton1);
group.add(theTimeButton);
group.add(theTypeButton);
group.add(theExtButton);
JLabel newLabel = new JLabel("Choose the Format type for the data to be displayed");
theButton = new JButton("OK");
theButton.addActionListener(this);
theButton.setActionCommand("" + THE_BUTTON_OPTION);
JPanel radioPanel = new JPanel(new GridLayout(0, 1));
radioPanel.add(newLabel);
radioPanel.add(theStandardButton1);
radioPanel.add(theTimeButton);
radioPanel.add(theTypeButton);
radioPanel.add(theExtButton);
radioPanel.add(theButton);
add(radioPanel, BorderLayout.LINE_START);
     public void actionPerformed (ActionEvent e) {
     if(e.getSource() == theButton)
     JFrame.setDefaultLookAndFeelDecorated(true);
//Create and set up the window.
JFrame frame = new JFrame("The Font");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
TableFonts newFont = new TableFonts();
newFont.setOpaque(true); //content panes must be opaque
frame.setContentPane(newFont);
//Display the window.
frame.pack();
frame.setVisible(true);
     selectedOption = Integer.parseInt(e.getActionCommand().trim());
     public Formats getInstance(){
          return this;
and the last class:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class TableFonts extends JPanel implements ActionListener{
     static String standardFont = "Standard Font";
     static String boldFont = "Bold Font";
     static String italicFont = "Italic Font";
     static String monospaceFont = "Monospace Font";
     public      JRadioButton theStandardButton ;
     public JRadioButton theBoldButton;
     public JRadioButton theItalicButton;
     public JRadioButton theMonospaceButton ;
     public TableFonts()
theStandardButton = new JRadioButton(standardFont);
     theStandardButton.setMnemonic(KeyEvent.VK_B);
theStandardButton.setSelected(true);
     theBoldButton = new JRadioButton(boldFont);
     theBoldButton.setMnemonic(KeyEvent.VK_B);
theItalicButton = new JRadioButton(italicFont);
     theItalicButton .setMnemonic(KeyEvent.VK_B);
theMonospaceButton = new JRadioButton(monospaceFont);
     theMonospaceButton.setMnemonic(KeyEvent.VK_B);
     ButtonGroup group = new ButtonGroup();
group.add(theStandardButton);
group.add(theBoldButton);
group.add(theItalicButton);
group.add(theMonospaceButton);
theStandardButton.addActionListener(this);
theBoldButton.addActionListener(this);
theItalicButton.addActionListener(this);
theMonospaceButton.addActionListener(this);
JLabel newLabel = new JLabel("Choose the correct font for the data to be displayed");
JPanel radioPanel = new JPanel(new GridLayout(0, 1));
radioPanel.add(newLabel);
radioPanel.add(theStandardButton);
radioPanel.add(theBoldButton);
radioPanel.add(theItalicButton);
radioPanel.add(theMonospaceButton);
add(radioPanel, BorderLayout.LINE_START);
     public void actionPerformed(ActionEvent e) {
The problem I am getting is the Number format exception when the OK button of the class Formats is clicked...
here is the error I am getting:
java.lang.NumberFormatException: For input string: "OK"
at java.lang.NumberFormatException.forInputString(NumberFormatException.
java:48)
at java.lang.Integer.parseInt(Integer.java:426)
at java.lang.Integer.parseInt(Integer.java:476)
at Formats.actionPerformed(Formats.java:80)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:17
64)
at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(Abstra
ctButton.java:1817)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel
.java:419)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:257
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonL
istener.java:245)
at java.awt.Component.processMouseEvent(Component.java:5134)
at java.awt.Component.processEvent(Component.java:4931)
at java.awt.Container.processEvent(Container.java:1566)
at java.awt.Component.dispatchEventImpl(Component.java:3639)
at java.awt.Container.dispatchEventImpl(Container.java:1623)
at java.awt.Component.dispatchEvent(Component.java:3480)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3450
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3165)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3095)
at java.awt.Container.dispatchEventImpl(Container.java:1609)
at java.awt.Window.dispatchEventImpl(Window.java:1590)
at java.awt.Component.dispatchEvent(Component.java:3480)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:450)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchTh
read.java:197)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThre
ad.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:144)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:136)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)
COULD YOU GUYS PLEASE TELL ME HOW TO GET AROUND THIS PROBLEM:
THANKS...

It's in this line:
selectedOption = Integer.parseInt(e.getActionCommand().trim());
Kind regards,
  Levi
PS. have you noticed the [code][code[i]] tags?

Compiling problem for java.

Hi, all,
I am new user of Java SDK standard edition. I have installed the J2sdk1_3_1_02 (standard edtion) under a certain directory on Solaris system. I also set the JAVA_HOME to the ../j2sdk1_3_1_02, and CLASSPATH to ../j2sdk1_3_1_02/lib/tools.jar.
I finished a simple example of "Helloworld.java", which can be compiled successfully. But when I use "java Helloworld" to run it, the erro message appeas as follows:
Unable to initialize threads: cannot find class java/lang/Thread
I need your people 's help, thanks a lot.
Kevin

Dear Cmouttet,
Thank you very much for the help. I followed your suggestion to change my setting about runtime environment in my classpath.
But the error still appears:
SIGSEGV 11* segmentation violation
si_signo [11]: SIGSEGV 11* segmentation violation
si_errno [0]: Error 0
si_code [1]: SEGV_ACCERR [addr: 0x0]
Full thread dump:
Segmentation Fault(coredump)
The following is that simple java program of Helloworld:
class Helloworld
public static void main(String args[])
System.out.println("Hello world, this xxd!");
Could you tell me how to do in next step to finish my fist trial of java technology?
Thanks for any reply!
kevin

Problem with Java Dates and UPDATE for SQL2000

I am having problems with the date formats for Java. I am trying to put the current date time into a SQL table, here it the code I am using:
var Today = new Date()
var conn = Server.CreateObject( "ADODB.Connection" )
conn.Open( "Provider=SQLOLEDB;Server=(local);Database=BillTracking;UID=sa;PWD=;")
var sql = "UPDATE BillAssignments SET DatePosted = " + Today + " WHERE AssignmentID = '" + Request.QueryString("AssignmentID") + "'"
var rs = conn.execute(sql)
I keep getting different errors and I have been unable to find a solution yet. I know that I need to change the date format from the Java standard to the one that SQL likes.
Help....
Norm...

Please tell us where the Java part of this comes in. I see that you are using JavaScript to load up data via an ADO connection (presumably on an IIS platform) - but I do not see where you are using Java
Lee

Problem generating stubs for Java EJB web service deployed in OAS

I created an EJB web service and I've successfully deployed it in my Oracle App Server. Some of the methods work fine but others produce the ff error:
org.apache.soap.SOAPException - java.lang.IllegalArgumentException: No Serializer found to serialize [classname] using encoding style [encoding]It seems that the objects specified as parameters in the web service methods exposed are the only ones that had stubs generated for them. Other objects I use, which are usually wrapped inside a Vector, did not have generated stubs.
Example:
public String loginUser(UserDTO userDTO) throws RemoteException, NamingException, SQLException;
public String addItems (Vector vecItems) throws RemoteException, NamingException, SQLException; // where vecItems is a collection of ItemDTO objects In this scenario, stubs were generated for the UserDTO class, but not for the ItemDTO class. In effect, calling the addItems method resulted to the exception I mentioned above.
I did a workaround wherein I declared a dummy method which accepted all the types of objects I needed as parameters so all the necessary stubs can be generated, but this fix doesn't feel like it's the proper solution to my problem.
If anyone can help me, it would be greatly appreciated. Thanks!

Crossposted:
Problem generating stubs for Java EJB web service deployed in OAS

In case of problems with SAP GUI for Java ...

Hello all,
in case of having problems (errors, ABAP dumps etc.) with SAP GUI for Java, please create an OSS message on component BC-FES-JAV with information described in OSS note 326558
http://www.service.sap.com/~form/sapnet?_FRAME=CONTAINER&_OBJECT=011000358700010521522001.
This makes sure our official support channels get aware of your problem.
Thanks and best regards
Rolf-Martin

Hello Rolf-Martin,
i don't have access to this website to view the note.
The version of the Suse libc is:
GNU C Library stable release version 2.3.2, by Roland McGrath et al.
Copyright (C) 2003 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.
Compiled by GNU CC version 3.3 20030226 (prerelease) (SuSE Linux).
Compiled on a Linux 2.4.20 system on 2003-03-13.
Best Regards,
Piotr Brostovski

Adobe Interactive forms & WebDynpro for java problem with IE7 and IE8

I have Interactive form ui-element in WebDynpro for java (ver. 7 SP 10) application. It works fine with IE6, but in IE7 (or IE8) it doesn't show that ui-element at all. We have tried to change IE7 security & advanced settings, but we have not made any progress. We have also tried to install/uninstall different Adobe reader versions etc.

I know a little more about the problem now. After viewing the XML source I change the property of the inputfield.
It was like this:
<field name="verdipers_felt" y="130.7001mm" x="180.1801mm" w="101.6004mm" h="44.4501mm" locale="no_NO" access="ReadOnly">
but i changed the access to be nonInteractive
<field name="verdipers_felt" y="130.7001mm" x="180.1801mm" w="101.6004mm" h="44.4501mm" locale="no_NO" access="nonInteractive">
now view2 shows the linebreak as in view1... Buut! when im going back to view1 from view2, the linebreaks gets converted into spaces
thats pretty wierd, aint it?

Problems with JNDI lookup for java:comp/env/ejb

Hi all,
I'm using OC4J 9.0.3 and I have problems when looking up for the local
EJB context.
I have a SLSB which refers to another SLSB via a JNDI mapping like
shown below. Both services are deployed within one EAR file.
(snippets of ejb-jar.xml and orion-ejb-jar.xml)
<ejb-jar>
<enterprise-beans>
<session>
<ejb-name>ServiceABean</ejb-name>
<home>com.coi.ServiceAHome</home>
<remote>com.coi.ServiceA</remote>
<ejb-class>com.coi.ServiceABean</ejb-class>
<session-type>Stateless</session-type>
<transaction-type>Container</transaction-type>
<ejb-ref>
<ejb-ref-name>ejb/some/sub/packages/ServiceB</ejb-ref-name>
<ejb-ref-type>Session</ejb-ref-type>
<home>com.coi.ServiceBHome</home>
<remote>com.coi.ServiceB</remote>
</ejb-ref>
</session>
</enterprise-beans>
</ejb-jar>
<orion-ejb-jar>
<enterprise-beans>
<session-deployment location="global/some/sub/packages/ServiceA" name="ServiceABean">
<ejb-ref-mapping name="ejb/some/sub/packages/ServiceB" location="global/some/sub/packages/ServiceB" />
</session-deployment>
</enterprise-beans>
</orion-ejb-jar>
The ApplicationInitialContextFactory will be used (prepared by the container),
so the lookup for ServiceB within a method of ServiceA should work as follows:
public class ServiceABean implements SessionBean
public void someMethod()
InitialContext con = new InitialContext(); // will be of class ApplicationContext
Context localEjbContext = (Context)con.lookup( "java:comp/env/ejb" );
ServiceBHome serviceBHome = (ServiceBHome) PortableRemoteObject.narrow(
localEjbContext.lookup( "some/sub/packages/ServiceB" ),
ServiceBHome.class );
The problem is now, that the lookup for "java:comp/env/ejb" doesn't work
and throws a NameNotFoundException.
To figure out what's actually happening during lookup I debugged a little bit and
tried a few things:
1. A lookup for "java:comp" works fine. It returns an instance of class FlatMapContext
which consists of a hash map which itself contains an entry for "env".
2. So a lookup for "env" on that FlatMapContext also works and returns an instance of SubContext.
3. A lookup for "ejb" using this SubContext causes a NameNotFoundException
with message "java:comp/env/ejb not found".
4. A lookup like con.lookup( "java:comp/env" ) throws also a NameNotFoundException
with message "java:comp/env not found (not inside a J2EE module, for instance a Web-App,
EJB, or Application-Client)".
Does anyone know something about this?
Regards
--thomas

Hi Debu,
Great! 9.0.4 will be released in june/july this year, right? Sorry for my ironical reaction, but does that mean, that I don't have any chance to get my whole stuff running in 9.0.3? I cannot believe that. Isn't there a wordaround I could apply? A setting or whatever to substitute the daft FlatCtx by something else that is implemented according to the spec?
Regards
--thomas

Problem in connecting to database from webdynpro for java

Hi
I have a problem in connecting to database from webdynpro application
I am using oracle 10 express edition as database and was able to connect to database from a java application.But was unable to connect from a webdynpro for java.
<b>I guess webdynpro for java uses open sql instead of vendor sql(I looked in the visual admin ,DB is using open sql) so unable to connect to database.Am i right.?</b>
Do i need to make any settings in the visual admin to make it work?
How to solve this problem.Please give me pointers
Thanks
Bala

Hi,
For connecting to Oracle, either you can use the normal JDBC connectivty code directly which is given below :
DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@Oracle_server_ip:Oracle port:SID of the Database","user_name","password");
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("your query");
In case you want to fetch data through ejbs, these are the steps to be followed :
1) Open the J2EE perspective
2) Create an EJB Module project
3) Right click on ejbModule, create a new EJB (select your EJB type)
4) While creating the ejb itself, you can add business methods by clicking Next in the UI. Another option is after creating the ejb, write the method in the bean, then select the method from ejb-jar.xml -> <bean name> ->method. Right click and select propogate to local & remote.
5) Double click on ejb-j2ee-engine.xml. select your bean and specify a Jndi name for eg: MyJndi.
6) Right click on the EJB project and add classes12.zip file (provided by Oracle) to its build path. (under libraries tab). Also check the same file under Order & Export.
7) Create an Enterprise Application project.
8) Right click on the EJB module project and select add to EAR project, then select the created EAR project.
9) Right click on the EJB project, select Build EJB Archive
10) Right click on the EAR project, select Build Application Archive
11) Open the WebDynpro perspective, open a new project, right click on the project ->properties. Do the following configurations :-
Java Build path - select the EJB project from projects , check the selected project under Order & Export
Project references select the EAR project
WebDynpro references select sharing references tab, click add & make an entry as : <vendor>/<EAR project name without .ear extension>
You can find the vendor name under application-j2ee-engine.xml file of the EAR project. By default it is sap.com. So if my EAR projects name is ABC, my entry would look like sap.com/ABC
12) Now the configurations are over and the EJB can be invoked by writing the client code inside the webdynpro component. Like:
InitialContext context = new InitialContext();
Object obj = context.lookup("MyJndi");
MyEJBHome home = MyEJBHome)PortableRemoteObject.narrow(obj,MyEJBHome.class);
MyEJB mybean = home.create();
int a = 0;
a= mybean.add(10,15);
wdContext.currentContextElement().setSum(a);
where MyEJB is my EJB name and MyJndi is my JNDI name
To connect to Oracle , you can write the usual Java code (given below) as a business methos of the ejb (similar to add() method in the example). And access it like mybean.<businessMethodName>().
DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@Oracle_server_ip:Oracle port:SID of the Database","user_name","password");
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("your query");
Extracted from Re: Webdynpro and Oracle
http://help.sap.com/saphelp_webas630/helpdata/en/b0/6e62f30cbe9e44977c78dbdc7a6b27/frameset.htm
May be of use to understand the VA Conf /people/varadharajan.krishnasamy/blog/2007/02/27/configuring-jdbc-connector-service-to-perform-database-lookups
Regards
Ayyapparaj

Problem in Uploading excel file using WebDynpro for Java

Hi All
I have followed for Uploading excel file using WebDynpro for Java added by Tulasi Palnati
I done all, but I'm getting 500 Exception please contact u r system admin meag at run time also Jxl/Workbook class not found msag but i downloaded Jxl.jar file and there is no error signals in coding part. How can I solve the Problem.
Thanks
Polaka

Please ask the people in the Web Dynpro Java forum for a solution.

Problems between Xcelsius and WebDynpro for Java

How should I do to show Xcelsius in WebDynpro for Java?
How should I transport data between Xcelsius and WebDynpro?
How should I control WebDynpro with Xcelsius?For example,firing plugs in Xcelsius like in WebDynpro to change one view to another.
How should I do to execute a Java method in Xcelsius?For example,scheduling a job on clicking a button in Xcelsius.
Besides these,I also want to know the same problems between other BOE contents and WebDynpro for Java.
Regards,
Abe

Hi Pradeep:
Well that purely depends on the business application (project) your client is proposing. Following are very few factors which will drive for creating web-based applications:
VC: it's a UI modeling tool (non-programming) for creating rapid creation of web-based applications.
WD: its a powered by Java and ABAP with which you can create robust business applications.
If your client is very choosy about rapid application development, reporting, rich user interface, to reduce TCO then VC is the choice. Or if the project contains typical integration with SAP and non-SAP systems, complex business logic development, integration with WCM systems...etc then WDJ is the option.
If youve some sort of custom development with facilitating the Development Infrastructure (NWDI) then WDJ is the only option I could say.
We hope with NW CE 7.1.1(referred by Priyanka Singh) tighter integration between these TWO tools may over come the ambiguity of using them.
Tnx,
MS

Problem with running sample code from XML Schema Processor for Java

Hi there,
I downloaded the XML Schema Processor for Java and tried it out. Unfortunately, it failed at the first step. FYI, I included all xmlparserv2.jar and xmlschema.jar in my classpath.
I compiled XSDSample.java with a warning: XSDSample.java uses a deprecated API. Recompile with "-deprecation" for details. There was no problem with compiling XSDSetSchema.java.
When I tried to run report.xml by typing java XSDSample report.xml, I got Parsing report.xml
NonParserException: null.
I guess that report.xml from the sample is not valid.
Could any one give me a hint? Any suggestion would be greatly appreciated.
---Denali
null

Please post this message at:
Forums Home » Oracle Technology Network (OTN) » Products » Database » XML DB

Problems uninstalling Forte for java 4 community edition

I just installed Forte for java 4 community edition at work, and when i tried to uninstalled it with add/remove programs from control panel. And the uninstall wizard start but then a Sun window apper and it is written, uninstalling and the uninstall program seems to be frozen.

i have the same problem, reading the documentation it seems you got to run the installer again and you ll get prompted with the "file deletion confirmation"
too bad i have a self-installing package and i don't get the prompt...
guesses anyone?

Still problems serializing xml-docs with xml-parser for java v2.0.2.7

Hi !
I'm using the Oracle XML Parser 2.0.2.7.0 and get some problems when serializing the XMLDocument.
In one class (DOMOut) I parse a xml-file with the oracle.xml.parser.v2.DOMParser, then obtain the XMLDocument and write it to System.out
In another class (DOMIn) I fetch the XMLDocument from System.in, search for a given Element and print it's TextValue (if existing) to System.out
That is where the error occurs.
I get the XMLDocument from System.in but the returning NodeList from doc.getElementsByTagName() is empty. [nl.getLength()==0] even if it shouldn't be.
Look at this code and output:
[DOMOut]
DOMParser parser = new DOMParser();
parser.parse(url);
XMLDocument doc = (XMLDocument)parser.getDocument();
ObjectOutputStream out = new ObjectOutputStream(System.out);
out.writeObject(doc); out.flush();
[DOMIn]
ObjectInputStream in = new ObjectInputStream(System.in);
XMLDocument doc = (XMLDocument)in.readObject();
doc.print(System.out);
NodeList nl = doc.getElementsByTagName("Name");
System.out.println("Length of NodeList: "+nl.getLength());
if (nl.getLength()==0)
System.out.println(argv[0] + ": not in this document!");
else {
XMLNode node = (XMLNode) nl.item(nl.getLength()-1);
System.out.println(node.getNodeName() + ": " + (node.getFirstChild()).getNodeValue());
This is the relevant code.
I javac both classes and then do this:
java DOMOut xmltestfile.xml > xx
java DOMIn Name < xx
And get this as output:
<?xml version = '1.0'?>
<!DOCTYPE course [
<!ELEMENT course (Name,Dept,Instructor,Student)>
<!ELEMENT Name ((#PCDATA)*)*>
<!ELEMENT Dept ((#PCDATA)*)*>
<!ELEMENT Instructor (Name)>
<!ELEMENT Student (Name)*>
]>
<course>
<Name>Calculus</Name>
<Dept>Math</Dept>
<Instructor>
<Name>Jim Green</Name>
</Instructor>
<Student>
<Name>Jack</Name>
<Name>Mary</Name>
<Name>Paul</Name>
</Student>
</course>
Length of NodeList: 0
Name: not in this document!
Has anyone an idea?
If I do all this stuff without serializing it works.
If I do not search for argv[0], but the string "Name" it fails.
If I do search for "*" it works fine!
I'm very confused could anybody please help me a bit??
Stefan.
[[email protected]]

The link has been fixed. You will go to the v2 download page
now. Sorry for the inconvience.
Oracle XML Team
http://technet.oracle.com
Oracle Technology Network
Renilton Oliveira (guest) wrote:
: I didn't find the file for version 2.0.0.0 as well.
: Renilton
: Andrei Filimonov (guest) wrote:
: : I tried to download XML Parser for Java v2 it seems that
only
: v
: : 1.0.1.4 is available. Could you please give an exact URL for
: v2
: : download?
: : Andrei Filimonov
: : Oracle XML Team wrote:
: : : The Oracle XML v2 parser is now available for download
here
: as
: : : an early beta release and is written in Java. It features
: an
: : : improved architecture over the Oracle XML v1 parser and
has
: : : shown better performance on small to large XML documents.
: It
: : : will also be able to format the XML document according to
a
: : : stylesheet, having integrated an XSLT processor.
: : : Version 2 of the XML Parser for Java, besides
incorporating
: an
: : : XSLT processor, has been re-architected from version 1.
This
: : has
: : : resulted in a number of changes to the class names
: especially
: : : those that support Namespaces. See v2changes.txt and
: the .diff
: : : difference files in the sample directory.
: : : Oracle XML Team
: : : http://technet.oracle.com
: : : Oracle Technology Network
null

Exercise problems for java

Similar Messages

Maybe you are looking for