Recursive problem
Hello !
I have a problem and can solve it.
I am calling within a Function Module a badi and calling the same Function Module
again within this badi beacuse I need it. And now I have big recursive loop with no ending.
How can I process to avoid this circultance ?
Regards
Erdem Sas
More like:
FORM recursion
USING a
CHANGING b.
* Use a to get next b
* If it's what you want.
* Exit.
* Else.
* perform recursion
* using b
* changing c
ENDFORM. " recursion
Rob
Edited by: Rob Burbank on Nov 3, 2008 2:33 PM
Since this is referenced in the Coffee Corner, I cleaned it up
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While trying to figure out if the recursive definition in java is innermost, outermost, ...
I stumbled upon a problem. Why is it that running "return eval(x--, eval(x , y));" or running "return eval(x - 1, eval(x , y));" yeilds different results. Please try running one and then the other before replying. I'm well aware or the fact that x-- is an autodecrementation and x - 1 doesn't store the value into x, but my reursive calls take care of that.
If there is an easier way to determine Java's recursive definition please let me know.
public class RecurF
public RecurF()
System.out.println(eval(1, 1));
public int eval(int x, int y)
System.out.print(x + " other ");
if(x == 0)
return x;
System.out.print(x + " ");
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}I stumbled upon a problem. Why is it that running
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eval(x--, eval(x , y))has undefined semantics, because you are modifying x inside the expression. The compiler is free to generate code that evaluates the second parameter before the first parameter, or the other way around.
This is true for any language, and Java does not enforce a particular order of evaluation of arguments, or even the order of evaluation and calling (i.e. the compiler is free to do something like:
t1 = x--;
t2 = y;
t3 = x;
t4 = eval(t2,t3);
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SQL recursion problem in custom groups table
hi all,
Consider the following seemingly simple table structure ( with sample rows ) :
PERMISSION_ID P_ID DESCRIPTION DESIGNATION
============= ==== =========== =======
1776 Null Z-ENGINEERING 88888
1860 Null Z-LABORATORY 88888
1909 Null Z-RESEARCH 88888
1902 Null Z-PLANT 88888
1905 Null Z-SOFTWARE DESIGN 88888
1903 Null Z-BLANKET 88888
1904 Null Z-OFFICE 88888
40000 1909 James Gosling 67890
40001 1909 Edgar Codd 21135
40002 1904 Alan Turing 85542
40003 1909 Z-SOFTWARE DESIGN 88888
40004 1905 Dennis Ritchie 12111
40005 1909 Z-OFFICE 88888
40006 1776 Brian Kernighan 84251
40007 1904 Z-ENGINEERING 88888
Explanation of table structure :
(1) All rows with P_ID = {Null} are the root groups, and they all have a uniform DESIGNATION of 88888.
(2) All rows that starts with 40000 are memberships; under these memberships scheme, a root group can become a member of another root group, cascaded, which means that root groups can be members of another root group or they can be members of multiple root groups ( and cascaded even ), as long as the cascade do not end up in a circular reference, or an endless cycle. The idea here is so that the memberships for both groups and human members can be chained.
(3) Both root groups and human memberships are stored in the same table above, using rules (1) & (2) as the logic.
(4) No additional table may be added to this table in order to implement rules (1), (2), & (3); columns may be added, though.
(5) Use only plain SQL statements ( SELECT, CONNECT BY, PRIOR, NOCYCLES, etc ... ); PL/SQL, functions, and procedures are strongly discouraged.
Desired output of the query is as follows :
The SELECT query should return a list of all human members which belongs to a specific root group. Using the example table above, the initial query should have the following intended result set:
(start with p_id = 1909) -- 1909 is root group Z-RESEARCH
PERMISSION MEMBERS
========== =======
40000 James Gosling
40001 Edgar Codd
40003 Z-SOFTWARE DESIGN
40005 Z-OFFICE
However, Z-SOFTWARE DESIGN has it's own member , Dennis Ritchie, so the updated result set should be :
PERMISSION MEMBERS
========== =======
40000 James Gosling
40001 Edgar Codd
40004 Dennis Ritche
40005 Z-OFFICE
Same is true for Z-OFFICE, but it's member is another root group, Z-ENGINEERING, whose member is Brian Kernighan, thus the final result set list would be as follows, which is the final intended list :
PERMISSION MEMBERS
========== =======
40000 James Gosling
40001 Edgar Codd
40004 Dennis Ritche
40002 Alan Turing
40006 Brian Kernighan
The problem now would be, how to generate the final intended list using the table scheme illustrated above, with no additional tables, but possible additional columns, using Oracle's SELECT ... START WITH ... CONNECT BY PRIOR ?
Any theoretical advice is greatly appreciated; even our consulting firm cannot solve this problem. Coming here to the Oracle Forums itself is a last resort. Perhaps someone here can take a gander at this seemingly simple problem. Fact is, solving this problem has lots of applications, one of which is the ability to mimic Outlook's nested distribution groups list.
Thank you so much for your time.Ok, first time back at a database, here my 2 cent.
I use the with-clause to simulate your sample-data, i have also added the master-reference-column i suggested. Just restrict the result to the group you want to. (i only put the id's in the query)
WITH DATA AS (SELECT 1776 PERMISSION_ID, TO_NUMBER(NULL) P_ID, TO_NUMBER(NULL) MASTER_PERMISSION_ID, 'Z-ENGINEERING' DESCRIPTION, 88888 DESIGNATION FROM DUAL
UNION ALL
SELECT 1860, Null, Null, 'Z-LABORATORY', 88888 FROM DUAL
UNION ALL
SELECT 1909, Null, Null, 'Z-RESEARCH', 88888 FROM DUAL
UNION ALL
SELECT 1902, Null, Null, 'Z-PLANT' ,88888 FROM DUAL
UNION ALL
SELECT 1905, Null, Null, 'Z-SOFTWARE DESIGN', 88888 FROM DUAL
UNION ALL
SELECT 1903, Null, Null, 'Z-BLANKET', 88888 FROM DUAL
UNION ALL
SELECT 1904, Null, Null, 'Z-OFFICE', 88888 FROM DUAL
UNION ALL
SELECT 40000, 1909, Null, 'James Gosling', 67890 FROM DUAL
UNION ALL
SELECT 40001, 1909, Null, 'Edgar Codd', 21135 FROM DUAL
UNION ALL
SELECT 40002, 1904, Null, 'Alan Turing', 85542 FROM DUAL
UNION ALL
SELECT 40003, 1909, 1905, 'Z-SOFTWARE DESIGN', 88888 FROM DUAL
UNION ALL
SELECT 40004, 1905, Null, 'Dennis Ritchie', 12111 FROM DUAL
UNION ALL
SELECT 40005, 1909, 1904, 'Z-OFFICE', 88888 FROM DUAL
UNION ALL
SELECT 40006, 1776, Null, 'Brian Kernighan', 84251 FROM DUAL
UNION ALL
SELECT 40007, 1904, 1776, 'Z-ENGINEERING', 88888 FROM DUAL
SELECT GROUP_REFERENCE,
THE_USERS.PERMISSION_ID,
USER_NAME,
FROM_GROUP
FROM (SELECT PERMISSION_ID,
DESCRIPTION FROM_GROUP,
CONNECT_BY_ROOT(PERMISSION_ID) GROUP_REFERENCE
FROM (SELECT PERMISSION_ID, TO_NUMBER(NULL) P_MASTER, DESCRIPTION
FROM DATA
WHERE DESIGNATION=88888
AND P_ID IS NULL
UNION ALL
SELECT MASTER_PERMISSION_ID PERMISSION_ID, P_ID P_MASTER, DESCRIPTION
FROM DATA
WHERE DESIGNATION=88888
AND P_ID IS NOT NULL
CONNECT BY PRIOR PERMISSION_ID=P_MASTER
START WITH P_MASTER IS NULL
) THE_GROUPS,
(SELECT P_ID PERMISSION_REFERENCE,
PERMISSION_ID,
DESCRIPTION USER_NAME
FROM DATA
WHERE MASTER_PERMISSION_ID IS NULL
AND P_ID IS NOT NULL
) THE_USERS
WHERE THE_GROUPS.PERMISSION_ID=THE_USERS.PERMISSION_REFERENCE -
Help guys, this XSLT is getting me down!
Im quite simply trying to take a string, and replace tabs with 4 non-breaking space characters.
Can someone please explain to me why the following template doesnt work? It should take in a string, perform the replacement in a recursive fashion, and finally print it out.
Any help is greatly appreciated.
Cheers,
Lee.
<xsl:template name="substitute">
<xsl:param name="string" />
<xsl:param name="from" select="'	'" />
<xsl:param name="to">
    
</xsl:param>
<xsl:choose>
<xsl:when test="contains($string, $from)">
<xsl:call-template name="substitute">
<xsl:with-param name="string" select="concat(substring-before($string, $from), $to, substring-after($string, $from))" />
<xsl:with-param name="from" select="$from" />
<xsl:with-param name="to" select="$to" />
</xsl:call-template>
</xsl:when>
<xsl:otherwise>
NO MORE SUBSTITUTION REQUIRED - FINAL STRING IS : <xsl:value-of select="$string"/>
</xsl:otherwise>
</xsl:choose>
</xsl:template>Help guys, this XSLT is getting me down!
Im quite simply trying to take a string, and replace
tabs with 4 non-breaking space characters.
Can someone please explain to me why the following
template doesnt work? It should take in a string,
perform the replacement in a recursive fashion, and
finally print it out.
Any help is greatly appreciated.
Cheers,
Lee.
<xsl:template name="substitute">
<xsl:param name="string" />
<xsl:param name="from" select="' '" />
<xsl:param name="to">
����
</xsl:param>
<xsl:choose>
<xsl:when test="contains($string, $from)">
<xsl:call-template name="substitute">
<xsl:with-param name="string"
ing" select="concat(substring-before($string, $from),
$to, substring-after($string, $from))" />
<xsl:with-param name="from" select="$from" />
<xsl:with-param name="to" select="$to" />
</xsl:call-template>
</xsl:when>
<xsl:otherwise>
NO MORE SUBSTITUTION REQUIRED - FINAL STRING IS :
: <xsl:value-of select="$string"/>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
It is not concat() problem, it is a recursion problem -- too many recursive calls.
I wouldn't recommand using recursion in XSL, yeah, it works, but you can't increase the stack size without restarting the JVM...
anyway, you can use translate function to do replacing, also you can call a java extension method to do string replacement. it is cleaner anyway and more efficient anyway. -
Developers,
5 dukes for the correct anwer. I asked my manager and he couldnt figure this out so here goes. A simple recursion problem - or so you might think.
JDom only allows one level deep serach for a tag name - no problem - so i wrote a recursive method which looks for a tag no matter how many levels deep. Here is the code
public void getParentNode(Element element) {
if(element.getName().equals("content")){
System.out.println("RETURNED");
return parentElement ;
List content = element.getContent();
Iterator iterator = content.iterator();
while (iterator.hasNext()) {
Object o = iterator.next();
if (o instanceof Element) {
Element child = (Element) o;
return (getParentNode(child));
return null;
}I watched this in the debugger and it kept hitting the retrun null and also retrun the 'parentElement'. The tag is DEFINITEL in the xml file.
I have no idea what to do - I am thinking or ripping out all the JDom references and using Xceres DOM - but this will be a pain.
What have i done wrong?
Thanks.Instaed of iterating over the nodes select the node with an xpath expression.
import org.jdom.xpath.*;
File xmlDocument;
SAXBuilder saxBuilder=new SAXBuilder("org.apache.xerces.parsers.SAXParser");
org.jdom.Document jdomDocument=saxBuilder.build(xmlDocument);
org.jdom.Attribute contentNode=(XPath.selectSingleNode(jdomDocument,"//content"); -
I am experiencing an issue with recursive use of a method which needs to append string each time boolean hasNext is true.
However in debug mode I detect the block if (hasNext) is being accessed even if the hasNext = false.
So to temporarily fix the problem instead of
if (hasMaster){
standardizedPath.append(toBeAdded);
I am using
if (hasMaster){
// FIXME enters the block even if hasMaster is false
// temporary solution
String toBeAdded = getStandardizedPath(next, filteredPaths);
if (!standardizedPath.toString().contains(toBeAdded)){
standardizedPath.append(toBeAdded);
which although works, but the cause still remains unclear to me
Any clue what is done wrongly here:
private static String getPreparedJavaStatement(
List<String> givenPaths, String objName) {
StringBuffer javaStatement = new StringBuffer();
String next = "";
List <String> filteredPaths = new ArrayList();
for (String path : givenPaths){
// split pattern "dependent,master,dependency"
String [] paths = path.split(",");
String dependent = paths[0];
String master = paths[1];
String dependency = paths[2];
if (dependent.equals(objName)){
javaStatement.append((master + "_" + dependency).toLowerCase());
next = master; // next start for the chain
} else {
filteredPaths.add(path);
// next the chain of getters should be appended recursively
standardizedPath = new StringBuffer();
boolean hasMaster = false;
for (String path : filteredPaths){
String dependent = path.split(",")[0];
if (next.equals(dependent)){
hasMaster = true;
if (hasMaster){
javaStatement.append(getStandardizedPath(next, filteredPaths));
System.out.println(javaStatement);
return javaStatement.toString();
static StringBuffer standardizedPath;
static String nextMaster;
// recursively constructs the java getters chain to the propagated master
private static String getStandardizedPath(
String next, List<String> filteredPaths ) {
Iterator it = filteredPaths.iterator();
while (it.hasNext()){
String path = (String) it.next();
String [] paths = path.split(",");
String dependent = paths[0];
nextMaster = paths[1];
String dependency = paths[2];
if(dependent.equals(next)){
if (dependency.contains("_")){
if (!dependency.equals(nextMaster)) {
dependency = nextMaster + "_" + dependency;
standardizedPath.append(".get"
+ PropertyUtils.standardizeForCG(dependency) + "()");
next = nextMaster;
boolean hasMaster = false;
for (String path : filteredPaths){
String dependent = path.split(",")[0];
if (next.equals(dependent)){
hasMaster = true;
if (hasMaster){
// FIXME enters the block even if hasMaster is false
// temporary solution
String toBeAdded = getStandardizedPath(next, filteredPaths);
if (!standardizedPath.toString().contains(toBeAdded)){
standardizedPath.append(toBeAdded);
return standardizedPath.toString();
}OK! Got you! And thanks for caring to answer :)
Not even gonna read the unformatted code, but i the fix is based on the incorrect assumption that you're entering an if block when the condition is false, then the "fix" is wrong. Actually i didn't mean to enter the block when the condition is false, what I really need is when the condition false is detected to break the loop and return,
but it doesn't. Couldn't just trace why after return the debugger enters the if block, but this time with hasMaster = true, which I didn't want.
I suppose some stupid loop or recursion problem. Anyway, will figure out after refreshing the mind.
In any case, if one cares to have a look here is the formatted code:
private static String getPreparedJavaStatement(
List<String> givenPaths, String objName) {
StringBuffer javaStatement = new StringBuffer();
String next = "";
List <String> filteredPaths = new ArrayList();
for (String path : givenPaths){
// split pattern "dependent,master,dependency"
// and filter out the direct master object variable
// from the masters of direct masters if any
String [] paths = path.split(",");
String dependent = paths[0];
String master = paths[1];
String dependency = paths[2];
if (dependent.equals(objName)){
javaStatement.append((master + "_" + dependency).toLowerCase());
next = master; // next start for the chain
} else {
filteredPaths.add(path);
// check if master has master(s)
standardizedPath = new StringBuffer();
boolean hasMaster = false;
for (String path : filteredPaths){
String dependent = path.split(",")[0];
if (next.equals(dependent)){
hasMaster = true;
if (hasMaster){
// here the chain of getters (CGStandardized) should be appended recursively
javaStatement.append(getStandardizedPath(next, filteredPaths));
System.out.println(javaStatement);
return javaStatement.toString();
static StringBuffer standardizedPath;
static String nextMaster;
// recursively constructs the java getters chain to the propagated master
private static String getStandardizedPath(
String next, List<String> filteredPaths ) {
Iterator it = filteredPaths.iterator();
while (it.hasNext()){
String path = (String) it.next();
String [] paths = path.split(",");
String dependent = paths[0];
nextMaster = paths[1];
String dependency = paths[2];
if(dependent.equals(next)){
// if appropriate dependency detected
if (dependency.contains("_")){
if (!dependency.equals(nextMaster)) { // has named dependency
dependency = nextMaster + "_" + dependency;
// no named dependency, can further proceed to direct master via getter
standardizedPath.append(".get"
+ PropertyUtils.standardizeForCG(dependency) + "()");
next = nextMaster;
boolean hasMaster = false;
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String dependent = path.split(",")[0];
if (next.equals(dependent)){
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if (hasMaster){
// FIXME issue with appending path more than once
// temporary solution
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standardizedPath.append(toBeAdded);
return standardizedPath.toString();
} -
Recursive StackOverFlow in Java client aplication
Hi,
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at sun.awt.windows.WComponentPeer.replaceSurfaceData(WComponentPeer.java:313)
at sun.awt.windows.WComponentPeer.displayChanged(WComponentPeer.java:372)
at sun.awt.windows.WCanvasPeer.displayChanged(WCanvasPeer.java:48)
at sun.awt.windows.WPanelPeer.displayChanged(WPanelPeer.java:142)
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at sun.awt.windows.WPanelPeer.recursiveDisplayChanged(WPanelPeer.java:130)
at sun.awt.windows.WPanelPeer.displayChanged(WPanelPeer.java:145)
at sun.awt.windows.WPanelPeer.recursiveDisplayChanged(WPanelPeer.java:130)
at sun.awt.windows.WPanelPeer.displayChanged(WPanelPeer.java:145)
at sun.awt.windows.WPanelPeer.recursiveDisplayChanged(WPanelPeer.java:130)
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at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
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Infinite loop error after using Java Sun Tutorial for Learning Swing
I have been attempting to create a GUI following Sun's learning swing by example (example two): http://java.sun.com/docs/books/tutorial/uiswing/learn/example2.html
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/** GUI for MicroMerger program
* Created July/06 at IARC
*@ author Danielle
package micromerger;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import javax.swing.JFileChooser;
import java.lang.Object;
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private static File inputFile1, inputFile2;
private static File sfile1, sfile2;
private static String file1Name, file2Name;
private String currFile1, currFile2;
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private JLabel enterLabel1, enterLabel2;
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javax.swing.SwingUtilities.invokeLater(new Runnable()
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System.out.println("About to run create GUI method");
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System.out.println("declared a new MGui....");
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String lookAndFeel = null;
lookAndFeel = UIManager.getSystemLookAndFeelClassName();
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+ lookAndFeel);
System.err.println("Did you include the L&F library in the class path?");
System.err.println("Using the default look and feel.");
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System.err.println("Can't use the specified look and feel ("
+ lookAndFeel
+ ") on this platform.");
System.err.println("Using the default look and feel.");
} catch (Exception e) {
System.err.println("Couldn't get specified look and feel ("
+ lookAndFeel
+ "), for some reason.");
System.err.println("Using the default look and feel.");
e.printStackTrace();
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private Component createLeftComponents()
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pane.add(welcomeLabel);
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enterFile1.addActionListener(new enterFile1Action());
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JFileChooser chooser = new JFileChooser();
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} // end classAnd now the main class:
* Main.java
* Created on June 13, 2006, 2:29 PM
* @author Danielle
package micromerger;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
public class Main
/** Creates a new instance of Main */
public Main()
* @param args the command line arguments
public static void main(String[] args)
MGui mainScreen = new MGui();
//mainScreen.setVisible(true);
/**Starting to get file choices and moving them into GPR Handler:
System.out.println("into main method");
String file1Name = new String("");
file1Name = MGui.get1Name();
System.out.println("good so far- have MGui.get1Name()");
}// end main(String[] args)
}// end class Mainum, yeah, you definitely have a recursion problem, that's going to create an infinite loop. you will eventually end up an out of memory error, if you don't first get the OS telling you you have too many windows. interestingly, because you are deferring execution, you won't get a stack overflow error, which you expect in an infinite recursion.
lets examine why this is happening:
in main, you call new MGui().
new MGui() creates a runnable object which will be run on the event dispatch thread. That method ALSO calls new MGui(), which in turn ALSO creates a new object which will be run on the event dispatch thead. That obejct ALSO calls new MGui(), which ...
well, hopefully you get the picture.
you should never unconditionally call a method from within itself. that code that you have put in the constructor for MGui should REALLY be in the main method, and the first time you create the MGui in the main method as it currently exists is unnecessary.
here's what you do: get rid of the MGui constructor altogether. since it is the implicit constructor anyway, if it doesn't do anything, you don't need to provide it.
now, your main method should actually look like this:
public static void main( String [] args ) {
SwingUtilities.invokeLater( new Runnable() {
public void run() {
MGui app = new MGui();
app.createAndShowGUI();
}// end mainyou could also declare app and call the constructor before creating the Runnable, as many prefer, because you would have access to it from outside of the Runnable object. The catch there, though, is that app would need to be declared final.
- Adam -
ITunes nickname already in use - error
When I sign on to Apple online (such as this support site) it shows my correct public nickname. However, when I try to change my nickname in the iTunes for Windows software client, I get an error that my nickname is already being used. I am singed into iTunes store with the same Apple ID that I am signed into this support site. How do I correct my nickname in iTunes Store?
23-Apr-200702:40 PM
yadda wrote:
If I do that reset, are the only thing I am going to lose contacts, photos, docs etc or will it do something more major? I am getting that error and want a quick fix. I don't mind reentering phone numbers etc, but don't want to lose/reset anything complicated.
thanks for any replies
I'm not sure exactly what you will lose, but Nokia does have the Backup application within PC Suite which can make a backup of your phone before you wipe it which you can then restore back to your phone after you wiped it. However there is a possibility that it could restore the very lock file you just wiped .. which would then become a recursive problem ...
You can download PC Suite here :
here : http://www.nokia.co.uk/A4144905
Regards,
Edward -
When attempting to open the web browser, I get a message saying web already in use when no other browser or data session is up.
Anyone know why this would be?23-Apr-200702:40 PM
yadda wrote:
If I do that reset, are the only thing I am going to lose contacts, photos, docs etc or will it do something more major? I am getting that error and want a quick fix. I don't mind reentering phone numbers etc, but don't want to lose/reset anything complicated.
thanks for any replies
I'm not sure exactly what you will lose, but Nokia does have the Backup application within PC Suite which can make a backup of your phone before you wipe it which you can then restore back to your phone after you wiped it. However there is a possibility that it could restore the very lock file you just wiped .. which would then become a recursive problem ...
You can download PC Suite here :
here : http://www.nokia.co.uk/A4144905
Regards,
Edward -
PC Suite & Nokia N95 Backup/Restore
My N95 doesn't seem to want to do a Backup let alone restore...
Keeps hanging at 66% backup when it hits 'phone specific' stuff - the last one on the list.
I have the most recent PC Suite - has anyone else suffered from this problem?
Yup, life sure moves pretty fast...Out of interest do you get any type of error message when PC Suite is attempting to backup your Messages ? Also - give it some time to back up - I've left it for a good 20 minutes just to see whether it times out or comes back with any specific error message.
I experienced a similar issue and it was down to having to reinstall the MMS Sync component of PC Suite.
Two things I would try are :
1) As a previous poster recommended - just try backing up to the memory card to see whether this works OK or not. Not being able to do so would indicate it's not a PC Suite related issue and localised to the phone itself.
2) Try reinstall PC Suite functionality on the phone itself. With the N95 connected to your PC, load up PC Suite (the main program which gives an overview of all the applications that collectively comprise of PC Suite), then goto the Help Menu and choose "Reinstall PC Suite support on your phone" - then try backing up again.
If both of these steps fail, I'd recomend wiping your phone to a factory reset condition (although your memory card should NOT be affected if you follow the link below - but to be safe I'd take it out nevertheless !). The only problem with this solution is that it leaves you in the recursive problem of having to wipe a phone you want to take a backup of (!). Hopefully however, you won't have to do this ...
To reset your phone, follow the instructions in this link :
/discussions/board/message?board.id=smartphones&message.id=4007
However please be aware that doing so will wipe ALL the data from your phone such as information in your calendar, contacts and so on.
In order to save your data you can use the PC Suite application to save and restore the data from your phone - this software can be found here :
http://www.nokia.com/pcsuite
If this doesn't work then it's likely you have a hardware fault and you should approach your local Nokia Service Centre to get your phone fixed.
Hope this helps.
Please let me know how you get on.
Regards,
Edward -
EJB lookup returned stub from a different classloader.
I've written an EJB for doing authenitcation. This EJB is accessed by an security-mbean (BEA's login module).
- The EJB is deployed in an EAR.
- The EJB-stubs are extracted and is included as part of the MBEAN Jar.
When I hit a webapp causing the EJB lookup to occur, the stub object returned is created by the webapp's classloader. This cause a ClassCastException when trying to cast the returned home interface into the home interface of the MBEAN's classloader.
Note that all this is happening on the same BEA server running WLS8.1.
I don't want to put the EJB jar on the system classpath so I can redeploy the EJB, the Application's EAR and the MBEAN to a cluster.
-alexRobert Greig <[email protected]> wrote:
Thanks for responding to my question, which newsgroup is more appropriate for
my line of question?
But before I move this thread, I would like to add:
I've already handled the recursion problem on top of the ejb-lookup before JNDI
becomes avaliable (while doing server startup) problem.
The advantage with the EJB model is this. By changing the host/port configuration,
I can switch between a local-authentication server or a remote provide authentication
server network configuration.
If I were to include the necessary classes in the mbean JAR from our application,
there maybe resources issues since I now have 2 classloaders loading my server-portion
of classes. Not sure how that will workout with resources and all. This model
has the disadvantage of any classes I have in the mbean JAR will require updates
outside my EAR. This wroks against the EAR deployment model.
-alex
Alex Cheung wrote:
I've written an EJB for doing authenitcation. This EJB is accessedby an security-mbean (BEA's login module).
- The EJB is deployed in an EAR.
- The EJB-stubs are extracted and is included as part of the MBEANJar.
This isn't a good approach. You are pretty much stuffed mainly for the
reasons you outline.
Also note that if you continue to go down this road you will have to
handle the potential recursion (i.e accessing an EJB will invoke a
security call to your provider!).
Why do you need to implement this as an EJB? The main advantages of EJBs
are security and container managed transactions neither of which is
relevant here surely?
Robert -
hello. my friend of mine has just bought a N73 and from a while, when he wants to use the Web application (Web Mini Map Browser) it says "Web already in use!". but the other web application works. can you tell what problem he has? can he download from the internet the Web application and reinstall it?
PS: Nokia 6288 supports the Web Mini Map Browser?
Thank you!23-Apr-200702:40 PM
yadda wrote:
If I do that reset, are the only thing I am going to lose contacts, photos, docs etc or will it do something more major? I am getting that error and want a quick fix. I don't mind reentering phone numbers etc, but don't want to lose/reset anything complicated.
thanks for any replies
I'm not sure exactly what you will lose, but Nokia does have the Backup application within PC Suite which can make a backup of your phone before you wipe it which you can then restore back to your phone after you wiped it. However there is a possibility that it could restore the very lock file you just wiped .. which would then become a recursive problem ...
You can download PC Suite here :
here : http://www.nokia.co.uk/A4144905
Regards,
Edward
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