Replication of utility/helper classes in JAR/WAR.

Hello folks,
I have recently learned the class loader hierarchy that is employed in
the WebLogic server. Previously, I was including the local component
interfaces of my EJBs in the EJB JAR file as well as the web
application WAR file. However, since the EJB class loader is the
superclass of the WAR class loaders, the WAR class loader can see all
classes in its level as well as the level above it (the EJB class
loader and system class loader). Therefore, I removed the Local
component interfaces from the WAR file, and the system works fine.
However, I have various utility/helper classes that are in the EJB JAR
file as well as the WAR file. Is it safe to remove them from the WAR
file? Is there any need to duplicate classes in the JAR/WAR file if
they are packaged together as an EAR file? Any input is highly
appreciated.
Best regards,
Ryan LeCompte
[email protected]
http://www.louisiana.edu/~rml7669

No, your helper classes will also be visible to the war class loader.
You might also consider packaging your helper classes in a separate jar
file. Then add a manifest class-path entry in your ejb.jar and your
web.war that references the utility jar file(s). This should work on
any J2EE server.
-- Rob
Ryan LeCompte wrote:
Hello folks,
I have recently learned the class loader hierarchy that is employed in
the WebLogic server. Previously, I was including the local component
interfaces of my EJBs in the EJB JAR file as well as the web
application WAR file. However, since the EJB class loader is the
superclass of the WAR class loaders, the WAR class loader can see all
classes in its level as well as the level above it (the EJB class
loader and system class loader). Therefore, I removed the Local
component interfaces from the WAR file, and the system works fine.
However, I have various utility/helper classes that are in the EJB JAR
file as well as the WAR file. Is it safe to remove them from the WAR
file? Is there any need to duplicate classes in the JAR/WAR file if
they are packaged together as an EAR file? Any input is highly
appreciated.
Best regards,
Ryan LeCompte
[email protected]
http://www.louisiana.edu/~rml7669

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Class to jar communication at run time

Hi,
I am developing a application using jdk 1.4 and have following query:
I have an application that displays some information in various languages (according to the language selected), i.e english, french, german etc. Say I select english, the application will display "Hello World" in English language and so on for other languages..
So my app is divided into three parts:
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Consider that we have already shipped the application. All we have to do is to send updated JAR file to the user. and ask him to update the XML file for new language. i.e no changes to be done at application. And application should communicate with update JAR files at the end user.
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I hope my question is clear. Feel free to ask any queries.
Thanks,
rdh

Java has a mechanism to cope with this - though it is not XML-based:
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          at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)


Since your class may be used by other subsystems also you can write a
          small abstract class or an interface for example
          interface ResourceHandler {
          public InputStream getStream();
          and make our method take ResourceHandler as an argument.
          which can be used as follows
          JndiUtil.someMethod(new ResourceHandler(){
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                         return context.getResourceAsStream("name");
          u can create a new inner class to serve a different purpose..
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                         return new FileInputStream(name);
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          nagesh
          PS: ooh yes, make this method throw an IOException
          and also you can use an abstract class if u have any
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          Kenny wrote:
          >
          > Nagesh,
          >
          > Thanks for the thought! However, by using the ServletContext, the JndiUtil class
          > would be tighted to the Servlet Container because it expects the caller passing
          > in a ServletContext. I would like to make the JndiUtil class shared by other
          > components in the system instead of only serving Servlets.
          >
          > Do you know if there is a way to locate a file in the system regardless which
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          >
          > Thanks!
          > kenny
          > Nagesh Susarla <[email protected]> wrote:
          > >try using ServletContext.getResourceAsStream()
          > >
          > >Kenny wrote:
          > >>
          > >> Hi,
          > >>
          > >> I have the following file structure in the war for my web application.
          > >>
          > >> WEB-INF/classes/com/olf/servlets/AppServlet.class
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          > >> WEB-INF/classes/com/olf/util/JndiUtil.class
          > >> WEB-INF/classes/com/olf/util/jndi.xml
          > >>
          > >> When the JndiUtil is invoked by the CommonUtil , the JndiUtil has no
          > >problem to
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          > >> the JndiUtil class is invoked by the AppServlet. An exception thrown
          > >from the
          > >> JndiUtil states that it can't locate
          > >> the XML file from WebLogic Home directory. Does anyone know why the
          > >search is
          > >> done on WebLogic Home or even got up there?
          > >>
          > >> Any help is greatly appreciate!
          > >> kenny
          > >>
          > >> In AppServlet.class
          > >> ===================
          > >> public void init(ServletConfig config) throws ServletException
          > >> {
          > >> ...
          > >>
          > >> InitialContext ic = JndiUtil.getInstance().getInitialContext();
          > >> ...
          > >> }
          > >>
          > >> In JndiUtil.class
          > >>
          > >> public final static JndiUtil getInstance()
          > >> {
          > >> ...
          > >>
          > >> SAXParserFactory factory = SAXParserFactory.newInstance();
          > >> SAXParser saxParser = factory.newSAXParser();
          > >> saxParser.parse(new File("jnid.xml"), handler);
          > >>
          > >> ...
          > >> catch (SAXException e){
          > >> e.printStackTrace();
          > >> System.out.println("SAXException:" + e.getMessage());
          > >> }
          > >> ...
          > >> }
          > >>
          > >> Below is the exception thrown by the SAX parser
          > >>
          > >> org.xml.sax.SAXParseException: File "file:C:/bea/wlserver6.1/jndi.xml"
          > >not found.
          > >> at weblogic.apache.xerces.framework.XMLParser.reportError(XMLParser.java:1088)
          > >> at weblogic.apache.xerces.readers.DefaultEntityHandler.startReadingFromDocument(DefaultEntityHandler.java:512)
          > >> at weblogic.apache.xerces.framework.XMLParser.parseSomeSetup(XMLParser.java:310)
          > >> at weblogic.apache.xerces.framework.XMLParser.parse(XMLParser.java:966)
          > >> at weblogic.xml.jaxp.WebLogicXMLReader.parse(WebLogicXMLReader.java:123)
          > >> at weblogic.xml.jaxp.RegistryXMLReader.parse(RegistryXMLReader.java:125)
          > >> at javax.xml.parsers.SAXParser.parse(SAXParser.java:346)
          > >> at javax.xml.parsers.SAXParser.parse(SAXParser.java:286)
          > >> at com.olf.util.JndiUtil.getInstance(JndiUtil.java:59)
          > >> at com.olf.servlets.AppServlet.init(AppServlet.java:60)
          > >> at weblogic.servlet.internal.ServletStubImpl.createServlet(ServletStubImpl.java:700)
          > >> at weblogic.servlet.internal.ServletStubImpl.createInstances(ServletStubImpl.java:643)
          > >> at weblogic.servlet.internal.ServletStubImpl.prepareServlet(ServletStubImpl.java:588)
          > >> at weblogic.servlet.internal.ServletStubImpl.getServlet(ServletStubImpl.java:368)
          > >> at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:242)
          > >> at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:200)
          > >> at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:2495)
          > >> at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2204)
          > >> at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:139)
          > >> at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)

No manifiest section for signature file entry iaik/utils/IaikSecurity.class

Why I got this exception when running my jar with:
java -jar My.jar
Exception:
Exception in thread "main" java.lang.SecurityException: no manifiest section for signature file entry iaik/utils/IaikSecurity.class
at sun.security.util.SignatureFileVerifier.verifySection(SignatureFileVerifier.java:260)
at sun.security.util.SignatureFileVerifier.process(SignatureFileVerifier.java:172)
at java.util.jar.JarVerifier.processEntry(JarVerifier.java:239)
at java.util.jar.JarVerifier.update(JarVerifier.java:194)
at java.util.jar.JarFile.initializeVerifier(JarFile.java:300)
at java.util.jar.JarFile.getInputStream(JarFile.java:362)
at sun.misc.URLClassPath$5.getInputStream(URLClassPath.java:616)
at sun.misc.Resource.getBytes(Resource.java:57)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:248)
at java.net.URLClassLoader.access$100(URLClassLoader.java:55)
at java.net.URLClassLoader$1.run(URLClassLoader.java:194)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)

his link contains tools for jar and signiture, maybe it helps
http://www.syncedit.com/jedit_details.html
it is very interesting

Help needed: getting jar files to work.

Right, to start off, i have been doing php and mysql for a long time and i thought it's time to start using java.
So now im trying to create an application. I use eclipse. All works well if i run the program from eclipse. But i want to create and executable or a jar file first. I used JSmooth but with that i get an error "Could not find the main class".
While exporting the project as a jar i specified the main class in manifest specification.
So these are my classes:
the Main.class
public class Main{
     public static void main(String[] args) {
          PageFrame page = new PageFrame();
          page.show();
}and the PageFrame.class
import java.net.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
class PageFrame extends JFrame implements ActionListener,MouseListener{
     String[] skillnames = {"attack","hitpoints","mining","strength","agility","smithing","defence","herblore","fishing","ranged","thieving","cooking",
               "prayer","crafting","firemaking","magic","fletching","woodcutting","runecraft","slayer","farming","construction","hunter","summoning"};
     JTextField username = new JTextField("",12);
     JTextArea box = new JTextArea(10,12);
     JButton search = new JButton("Search");
     int[] differences = {0,83,174,276,388,512,650,801,969,1154,1358,1584,1833,2107,2411,2746,3115,3523,3973,4470,5018,5624,6291,7028,7824,
               8740,9730,10824,12031,13363,14833,16456,18247,20224,22406,24815,27473,30408,33648,37224,41171,45529,50339,55649,61512,67983,
               75127,83014,91721,101333,111945,122660,136594,150872,166636,184040,203254,224466,247886,273742,302288,333804,368599,407015,
               449428,496254,547953,605032,668051,737627,814445,899257,992895,1096278,1210421,1336443,1475581,1629200,1798808,1986068,2192818,
               2421087,2673114,2951373,3258594,3597792,3972294,4385776,4842295,5346332,5902831,6517253,7195629,7944614,8771558,9684577,10692629,
               11805606,13034431,14567891};
     URL page;
     static String name;
     JLabel[] skills = new JLabel[24];
     JLabel skillicons = new JLabel();
     public PageFrame(){
          super("Stats Lookup");
          setSize(800,600);
          setResizable(false);
          try{
               UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
               SwingUtilities.updateComponentTreeUI(this);
          }catch (Exception e){
               System.err.println("Yo" + e);
          //teen labelid;
          for (int i = 0; i < skills.length;i++){
               ImageIcon icon = new ImageIcon(PageFrame.class.getResource("images/skillimages/" + skillnames[i] + ".gif"));
               skills[i] = new JLabel("00",icon,JLabel.CENTER);
          JPanel pane = new JPanel();
          GridBagLayout maingrid = new GridBagLayout();
          setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          GridBagConstraints constraints = new GridBagConstraints();
          JPanel skillPane = new JPanel();
          GridBagLayout levelslyo = new GridBagLayout();
          GridBagConstraints sConstraints = new GridBagConstraints();
          sConstraints.ipadx = 15;
          sConstraints.ipady = 10;
          skillPane.setLayout(levelslyo);
          int k = 0;
          int m = 1;
          buildconstraints(sConstraints,12,4,1,1,2,2);
          skillPane.add(skillicons);
          for (int i = 0; i < skills.length;i++){
               buildconstraints(sConstraints,m,k,1,1,2,2);
                    levelslyo.setConstraints(skills, sConstraints);
                    //skills[i].setText(" 0 ");
                    skillPane.add(skills[i]);
                    skills[i].addMouseListener(this);
                    m+=2;
                    if (m == 7){
                         m = 1;
                         k +=1;
          /*m = 0;
          k = 0;
          for (int i = 0; i < skills.length;i++){
               System.out.println("Paremale: " + m + " Alla: " + k);
               buildconstraints(sConstraints,m,k,1,1,2,2);
               levelslyo.setConstraints(skillicons, sConstraints);
               skillicons = new JLabel(icon);
               skillPane.add(skillicons);
                    m+=2;
                    if (m == 6){
                         m = 0;
                         k +=1;
          buildconstraints(constraints,0,0,1,1,100,100);
          maingrid.setConstraints(username, constraints);
          buildconstraints(constraints,1,0,1,1,100,100);
          maingrid.setConstraints(search, constraints);
          buildconstraints(constraints,0,1,1,1,100,100);
          maingrid.setConstraints(skillPane, constraints);
          pane.setLayout(maingrid);
          constraints.fill = GridBagConstraints.BOTH;
          search.addActionListener(this);
          box.setEditable(false);
          buildconstraints(constraints,1,1,2,1,120,100);
          maingrid.setConstraints(box, constraints);
          pane.add(username);
          pane.add(search);
          pane.add(box);
          pane.add(skillPane);
          setContentPane(pane);
          //getContentPane().add(scroll);
          pack();
          setVisible(true);
          WindowListener l = new WindowAdapter(){
               public void windowClosing(WindowEvent evt){
                    System.exit(0);
          addWindowListener(l);
     void buildconstraints(GridBagConstraints gbc, int gx, int gy, int gw, int gh, int wx,int wy){
          gbc.gridx = gx;
          gbc.gridy = gy;
          gbc.gridwidth = gw;
          gbc.gridheight = gh;
          gbc.weightx = wx;
          gbc.weighty = wy;
     /*Vector ranks = new Vector();
     Vector levels = new Vector();
     Vector exp = new Vector();*/
     class Stats{
          int[] levels = new int[34];
          int[] experience = new int[34];
          int[] ranks = new int[34];
     Stats stats = new Stats();
     public void getStats(URL url){
          URLConnection conn = null;
          InputStreamReader in;
          BufferedReader data;
          String line;
          StringBuffer buf = new StringBuffer();
          try{
               conn = this.page.openConnection();
               conn.connect();
               //box.setText("Connection opened");
               in = new InputStreamReader(conn.getInputStream());
               data = new BufferedReader(in);
               //box.setText("Reading data...");
               int ts=0;
               while ((line = data.readLine()) != null){
                    buf.append(line + "\n");
                    StringTokenizer tokenize;
                    tokenize = new StringTokenizer(line.toString(),",");
                    int[][] paarid = {{1,0},{2,3},{3,6},{4,1},{5,9},{6,12},{7,15},{8,11},{9,17},{10,16},{11,8},{12,14},{13,13},
                              {14,5},{15,2},{16,7},{17,4},{17,10},{19,19},{20,20},{21,18},{22,22},{23,21},{24,23}};
                    if (ts < 25 && ts > 0){
                         int slot = paarid[ts-1][1];
                              stats.ranks[slot] = Integer.parseInt(tokenize.nextToken());
                              int yo = Integer.parseInt(tokenize.nextToken());
                              stats.levels[slot] =yo;
                              stats.experience[slot] = Integer.parseInt(tokenize.nextToken());
                    ts++;
               for (int i = 0; i < skills.length;i++){
                    String text = ""+stats.levels[i];//testings[i];//
                    skills[i].setText(text);
          }catch(IOException e){
               box.setText("Insert a username \nfirst!");
     public String getNextXp(int level, int currxp){
          String nextXp;
          if (level > 98){
               nextXp = "N/A";
          }else{
               nextXp = ""+(differences[level] - currxp);
          return nextXp;
     public void actionPerformed(ActionEvent evt){
               String newuser = username.getText().toString();
               name = newuser;
               String address = "http://hiscore.runescape.com/index_lite.ws?player="+name;
               try{
                    page = new URL(address);
                    getStats(page);
               }catch(MalformedURLException e){
                    box.setText("Insert a username");
               repaint();
     public void mouseEntered(MouseEvent e) {
          //if (experience[].isEmpty()){
               Object s = e.getSource();
               for (int i = 0; i < skills.length;i++){
                    if (s == skills[i]){
                         box.setText("Rank: " + stats.ranks[i] + "\nExperience: " + stats.experience[i] + "\nExp until next: " + getNextXp(stats.levels[i],stats.experience[i]));
     public void mouseExited(MouseEvent e) {
box.setText("");
     public void mouseClicked(MouseEvent e) {
     public void mousePressed(MouseEvent e) {
     public void mouseReleased(MouseEvent e) {
This is just a little project i thought i'd make for learning.
But can anyone help me make a working jar or an exe file?
The Jar i created does nothing, no error or anything.
Thanks for Help.

How should i run the jar file then? I am double clicking it yes.
EDIT: i ran the program through command line and i got an error:
Exception in thread "main" java.lang.NullPointerException
at javax.swing.ImageIcon.<init>(Unknown Source)
at PageFrame.<init>(PageFrame.java:41)
at Main.main(Main.java:4)OK - so it looks like you've found a command line!
You read these stack traces from the top down. Often the most interesting line is the first line that refers to your code. In this case line 41 of PageFrame.java which, I guess is this:
ImageIcon icon = new ImageIcon(PageFrame.class.getResource(
        "images/skillimages/" + skillnames[i] + ".gif"));The ImageIcon constructor is grumbling about being told to construct an icon from a null resource. getResource() will return null if it cannot find the resource that you specify.
The first thing to do is check that the .gif image is where it should be. You have specified it as "images/skillimages/etc" so use the command line to view the contents of the .jar file (or maybe Eclipse will let you do this). Next to PageFrame.class there should be a folder "images" and within it a folder "skillimages" and within that the image file. If not then your jar export has been seen up wrongly and is not including the required resource files.
(The "View" command is explained here: [http://java.sun.com/docs/books/tutorial/deployment/jar/view.html].)
Next check the case of the file names. On Windows getResource() will not worry about the cAsE of filenames so the resources will be located fine when running the program unjarred (including within Eclipse). But it does worry about the case of jar entry names. Bottom line: keep the file names all lower case because you use them that way in the code.
Finally, in case it is a particular image resource that's causing the problem you could add some code to print out its name just before you try and create the icon.
for (int i = 0; i < skills.length;i++){
    System.out.println(
            "About to make icon from " + "images/skillimages/" + skillnames[i] + ".gif");
    ImageIcon icon = new ImageIcon(PageFrame.class.getResource(
            "images/skillimages/" + skillnames[i] + ".gif"));
    skills[i] = new JLabel("00",icon,JLabel.CENTER);
}

Deploying servlets (not in jar/war/ear!) to OC4J?

I must be missing some very tiny but crucial issue....
For over 2 days now (shame) I have been trying but not
succeeding to deploy servlets to OC4J behind Apache. The 'behind
Apache'-part is easy. Just set up a proxy. This is because
Apache configuration is easy and well documented. But here is my
real problem. I am using JDev 3.2 (9i too large) and this is
what I want:
I want to code a servlet in Jdeveloper, compile it to a class-
file, not a jar, war, ear or whatever-r. Then I want to set up
OC4J in such a way that I can access my servlets from the
directory where the class files are. I do NOT want to use the
default-web-app subdirectory for obvious reasons. Please, how do
I set up OC4J to just look in my own classes-directory with my
own servlets???? No jar, no war, no ear.
I have been reading all sorts of information on this and tried
everything, but am not succeeding and getting all sorts of
error/not found messages.
Extra info:
I am using OC4J on windows. To start I use java -jar orion.jar,
to restart I use ^C and repeat the start command. Is that ok or
do I need to restart in a different way? I tried to setup OC4J
as a service but the link to runexecsvc went astray to judosoft
Any help will be greatly appreciated!

Avi,
Thanks for your swift reply. I have indeed read the docs, but
the exploded directory format does not seem to work for one
reason or another (got some error messages on file not found or
something). Have you succeeded in deployment using exploded
directories? If so, I would be greatly interested in your xml-
files and directory structure!
But, please do not spend too much time on this, because I have
now decided that I will deploy using a war. I have written a
small script to make a war out of my whole project and copy it
to de OC4J file system. This works and everybody is happy.
Thanks again,
Martijn

Weblogic 10.3.2 EJB3 Local Interface in POJO/Helper classes

Hi,
I have a jar file containing all EJB's in application & some Helper classes. I want to access Local interfaces of EJBs in those helper classes. Is there any way I can do it? I've gone through Maxence Button & Jay SenSharma 's blogs about accessing Local interface. but it doesn't help. May be these two guys can help me more here.. My requirement is very simple. Just to access local interface in POJO/Helper classes that are in same JAR file as EJB's. I can't get reference with @EJB class level annotation as Helper classes are called independently from MBean services.. not from any EJB or Servlert.
Please if anyone can tell me how do I get reference of local interfaces, that would be really good.
my environment is
Weblogic 10.3.2
EJB3
Regards,
Prasad

Hi,
Just check ...If you want something like mentioned in the below Link with a complete Example:
[http://jaysensharma.wordpress.com/2009/08/16/weblogic-10-3-ejb3-local-lookup-sample/|http://jaysensharma.wordpress.com/2009/08/16/weblogic-10-3-ejb3-local-lookup-sample/]
Regards
Jay SenSharma

Replication of utility/helper classes in JAR/WAR.

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