Wait() function - just trying to understand the reasons behind
Why the function wait() in Java requires the caller own the object�s monitor of the calling object
thnx
but why should only one thread at a time can own an
object's monitor.Because otherwise how would you prevent concurrent access to shared resources? Every Object has a wait set, I think if concurrent access was allowed to this wait set you could get into all sorts of problems.
Similar Messages
-
UTL_HTTP.end_of_body Exception Error. Trying to Understand the Reason Why?
I have the following PLSQL Function that returns a End_of_body Error. This started when we migrated from 10g to 11g. It is simple enough to capture so the error does not stop the Function Flow, but the error causes the OCI driver in OBIEE to error, which prevents the use of OBIEE IBOT to execute. Trying to understand why this error is occurring..not sure if we have a permissions issue on the UTL_HTTP Package or what?
Anyone seen this problem in 11g? Suggests on resolving would be great. Thanks.
FUNCTION AA_DEMO_PO_WSDL(IN_MESSAGE IN VARCHAR2)
RETURN VARCHAR IS
soap_request varchar2(30000);
soap_respond varchar2(30000);
http_req utl_http.req;
http_resp utl_http.resp;
launch_url varchar2(240) ;
o_message varchar2(240) ;
po_amount number := 2000 ;
total_calls number := 0;
cursor c_PO_exists is Cursor Logic..
begin
total_calls := 0;
For po_wsdl in c_PO_exists
LOOP
total_calls := total_calls + 1;
soap_request:='<?xml version="1.0" encoding="UTF-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
<soap:Header/>
<soap:Body xmlns:ns1="http://xmlns.oracle.com/PurchaseOrder_Approval">
<ns1:ProcessRequest><ns1:input>PO' || po_wsdl.order_no || '</ns1:input></ns1:ProcessRequest>
</soap:Body>
</soap:Envelope>';
Begin
http_req:= utl_http.begin_request('myURL/PurchaseOrder_Approval/1.0','POST','HTTP/1.1');
utl_http.set_header(http_req, 'Content-Type', 'text/xml') ;
utl_http.set_header(http_req, 'Content-Length', length(soap_request)) ;
utl_http.set_header(http_req, 'SOAPAction', 'initiate');
utl_http.write_text(http_req, soap_request) ;
http_resp:= utl_http.get_response(http_req) ;
utl_http.read_text(http_resp, soap_respond) ;
utl_http.end_response(http_resp) ;
Exception
WHEN UTL_HTTP.end_of_body THEN
utl_http.end_response(http_resp);
When utl_http.too_many_requests then
utl_http.end_response(http_resp);
o_message := 'End_Reponse' || ' from proc.';
when OTHERS then
o_message := SQLERRM || ' from proc.';
return o_message;
end;
END LOOP;
Return 'Workflow Initiated-' ||to_char(total_calls);
end AA_DEMO_PO_WSDL;Hi, thanks,
it is oracle10g,
The Exception is : ORA-29266: end-of-body reached
ORA-06512: at "SYS.UTL_HTTP", line 1349
then the line in my function ,
damorgan wrote:
But I do note that when I do this I always do a get_header_count and get_header before get_read.what get_read , u mean?
thanks for the link ,
appreciated -
Trying to understand the code???
Hi,
I am trying to understand the following bit of code, currently the code puts each catalogue into a different row of the table but i want each catalogue to be put in the next column
(so the catalogues appear across the page on the actual web page). The following code is for the page in question but im not sure how much is relevant so i will paste it all and highlight the section i think is relevant:
<html>
<%-- DECLARATIONS --%>
<%@ page import="se.ibs.ns.cf.*, se.ibs.ccf.*, se.ibs.bap.*, se.ibs.bap.util.*, se.ibs.bap.web.*, java.util.*, se.ibs.ns.icat.*, se.ibs.bap.asw.cf.*, java.lang.*" %>
<% ItemCatalogueBean bean = (ItemCatalogueBean)SessionHelper.getSessionObject("ItemCatalogueBean",session);
String resourcePath = bean.getResourcePath(null);
String title = "Product catalogue";
String languageCode = bean.getLanguageCode();
%>
<%@ include file="FuncHead.jsp" %>
<BODY class="IBSBody" onLoad="loaded = true;">
<form method="POST" action=<%= bean.getEncodedServlet("se.ibs.ns.icat.ItemCatalogueSearchServlet", response) %> name="basicForm">
<%@ include file="FuncSubmitScript.jsp" %>
<%@ include file="FuncPageBegin.jsp" %>
<div align="center">
<table border="0" width="895">
<tr>
<td align="left" width="502">
<div align="left">
<table border="0" width="500">
<tr>
<td class="IBSPageTitleText" align="left" valign="top" width="238">
<%@ include file="FuncPageTitle.jsp" %>
<%@ include file="FuncPageTitleImage.jsp" %>
<br>
On this page you can see the product catalogues. Click on one of the
links to go to the next level. Alternatively you can click the <b>Search
catalogue</b> button to find the products of interest.</td>
<td width="248" valign="bottom">
<div align="left"><%@ include file="FuncShoppingCart.jsp" %></div>
</td>
</tr>
</table>
</div></td></tr></table></div>
<input type="submit" value="Search catalogue" name="ACTION_NONE" onClick="submitButtonOnce(this); return false">
<hr>
<%-- REPEAT CATALOGUES --%>
<div align="left">
<table border="0" width="100%">
<% Vector catalogues = bean.getItemCatalogues();
int cataloguesSize = catalogues.size();
for (int i = 0; i < cataloguesSize; i++){
BAPItemCatalogue cat = (BAPItemCatalogue) catalogues.elementAt(i); %>
<%-- LINK AND MARK AS NEW --%>
<tr>
<td width="23%"><a class="IBSMenuLink" href="link" onClick="javascript:invokeLink('<%= bean.getEncodedServlet("se.ibs.ns.icat.ItemCatalogueCategoryServlet", response) %>?CODE=<%= ToolBox.encodeURLParameter(cat.getCode())%>'); return false">
<%= cat.getDescription(languageCode) %></a>
</td>
<td width="40%" align="right">
<% if (cat.isNew()) {%>
<img border=0 src="<%= resourcePath %>new.gif">
<% } %>
</td>
</tr>
<%-- CATALOGUES IMAGE AND INTERNET INFORMATION (text, multimedia objects,downloads, links...) --%>
<tr>
<td width="23%" valign="top" align="left">
<% if (bean.isAdvanced(cat) && bean.hasMultimediaImage(cat)) { %>
<a href="link" onClick="javascript:invokeLink('<%= bean.getEncodedServlet("se.ibs.ns.icat.ItemCatalogueCategoryServlet", response) %>?CODE=<%= ToolBox.encodeURLParameter(cat.getCode())%>'); return false">
<img border="0" src="<%= bean.getMultimediaImage(cat) %>"></a>
<% } else {%>
<img border="0" src="<%= resourcePath %>Catalog.gif">
<% } %>
</td>
<td class="IBSTextNormal" width="40%" valign="top">
<%= bean.getWebText(cat) %>
</td>
</tr>
<tr>
<td width="23%">
</td>
<td width="40%">
<% Vector mmLinks = bean.getMultimediaLinks(cat);
int mmLinksSize = mmLinks.size();
for (int ml=0; ml<mmLinksSize; ml++){
BAPCodeAndDescription mmLink = (BAPCodeAndDescription)mmLinks.elementAt(ml); %>
<a class="IBSLink" href="<%= mmLink.getCode() %>" target="_blank"><%= mmLink.getDescription() %></a><br>
<% } %>
<% Vector webLinks = bean.getWebLinks(cat);
int webLinksSize = webLinks.size();
for (int wl=0; wl<webLinksSize; wl++){
BAPCodeAndDescription webLink = (BAPCodeAndDescription)webLinks.elementAt(wl); %>
<a class="IBSLink" href="<%= webLink.getCode() %>" target="_blank"><%= webLink.getDescription() %></a><br>
<% } %>
</td>
</tr>
<%}%>
</table>
</div>
<%@ include file="FuncPageLinks.jsp" %>
<%@ include file="FuncPageEnd.jsp" %>
</form>
</body>
</html>i hope someone could help me to understand this,
thank you for your helpYou've probably already seen these, but here are a couple of links that may help.
http://help.adobe.com/en_US/FlashPlatform//reference/actionscript/3/operators.html#array_a ccess
http://www.adobe.com/livedocs/flash/9.0/ActionScriptLangRefV3/Array.html
What's basically happening is that the "for" loop goes through each item in the array. Don't be confused by the fact that two of the items in the array are Strings and one is an Integer - variable i being a String has nothing to do with the data type of the elements in the array.
The following code:
private function createLabels():void
var myArray:Array = ['one', 'two', 3];
for(var i:String in myArray)
trace("i = " + i);
trace(myArray[i]);
gives the following results:
i = 0
one
i = 1
two
i = 2
3
From that we can see that the "for" loop is assigning the index number of each array element, not the actual array element ('one', 'two', or 3) to the variable i. So calling myArray[i] is the same as calling myArray[0] the first time through the loop. This type of "for" loop is just a shorter way of doing the following, which produces exactly the same results:
private function createLabels():void
var myArray:Array = ['one', 'two', 3];
for(var i:int = 0; n < myArray.length; i++)
trace("i = " + i);
trace(myArray[i]);
Hope that helps.
Cheers! -
Trying to understand the basic concept of object oriented programming.
I am trying to understand the basic concept of object oriented programming.
Object - a region of storage that define is defined by both state/behavior.
( An object is the actual thing that behavior affects.)
State - Represented by a set of variables and the values they contain.
(Is the location or movement or action that is the goal that the behavior is trying to accomplish.)
Variables- (What does this mean?)
Value - (What does this mean?)
Behavior - Represented by a set of methods and the logic they implement.
( A set of methods that is built up to tell's the how object to change it's state. )
Methods - A procedure that is executed when an object receives a message.
( A very basic comand.For example the method tells the object to move up, another method tells the method to go left. Thus making the object move up/left that combination is the behavior.)
Class - A template from which the objects are created.
( I am very confused on what classes are.)
- The definitions of the words I obtained from the "Osborne Teach Yourself Java". The () statements are how I interperate the Mechanisms (I do not know if Thats what you call them.) interact with each other. I understand my interpretation may be horribly wrong. I will incredibly appreciate all the support I may get from you.
Thank youObject oriented programming is a replacement for the older idea of procedural programming (you can research procedural programming in google). As I understand it, in procedural programming, you have a step by step set of function calls to accomplish some task. Each function receives a data structure, manipulates it, and passes it to the next function. The problem with this is that each function preforms some action for the overall task and can't easily be reused by some other task. Its also harder to read the flow of what is happening with raw data structures flying all over the place.
In object oriented programming, an object calls a function of another object and receives back, not a data structure, but another object. Objects contain a data structure that can only be accessed by its functions. An object is not so much a sub component of a bigger task, as it is a service that any other task can use for any purpose. Also, when you pass an object to the caller, the caller can ask questions about the data structure via its functions. The developer doesnt have to know what the previous function did to the data by reading up on any documentation, or having to reverse engineer the code.
I suggest the best way of learning this is to code something like a library object.
A library object contains a collection of book objects
A book object contains a collection of chapter objects
A chapter object contains a collection of paragraph objects
A paragraph object contains a collection of sentence objects
A sentence object contains a collection of word objects.
Add functions to each object to provide a service
Example: A library object should have a:
public void addBook(Book book)
public Book getBook(String title)
public boolean isBookInLibrary(String title)
The key is to add functions to provide a service to anyone who uses your object(s)
For example, what functions (service) should a paragraph object provide?
It shouldn't provide a function that tells how many words there are in a sentence. That function belongs to a sentence object.
Lets say you want to add a new chapter to a book. The task is easy to read
if you write your objects well:
Sentence sentence1=new Sentence("It was a dark and stormy night");
Sentence sentence2=new Sentence("Suddenly, a shot ran out");
Paragraph paragraph=new Paragraph();
paragraph.addSentence(sentence1);
paragraph.addSentence(sentence2);
Paragraphs paragraphs=new Paragraphs();
paragraphs.addParagraph(paragraph);
Library library= new Library();
library.getBook("My Novel").addChapter("Chapter 1",paragraphs).
Now, lets say you want to have a word count for the entire book.
The book should ask each chapter how many words it contains.
Each chapter should ask its paragraphs, each paragraph should ask
its sentences. The total of words should ripple up and be tallied at each
stage until it reaches the book. The book can then report the total.
Only the sentence object actually counts words. The other objects just tallies the counts.
Now, where would you assign a librarian? What object(s) and functions would you provide?
If written well, the project is easily extensible. -
In vpd_admin user I have just tried to delete the policy and it doesnt dele
In the dtabase in vpd_admin user I have just tried to delete the policy and it doesnt delete.
Just sits there .
(This works on the live system, just checked.)
non working system looks like:
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> begin
dbms_rls.drop_policy( 'CF', 'CF_PARTICIPANT_MENTOR', 'CF_PM_POL' );
exception
when others then null;
2 3 4 5 end;
6
begin
ERROR at line 1:
ORA-01013: user requested cancel of current operation
I have looked in the alert_pathway.log , error.log access.log for errors and found no obvious ones.
Not sure where to look,
originally posted in APEX as a problem with APEX
I found this on a 3.2 apex install on a development machine 1 have a number of workspaces.
in one workspace in which I have been developing 3 applications and in which I have VPD enabled.
When I click next after choosing table name in create form form table it times out.
It does not take you to the page where you enter or confirm the page number, page name, etc.
I have tried another workspace on the same server and it works to fcreate the form.
On a separate machine/install the same workspace which does not work above to create form form table does work.
The VPD setup is not identical in this workspace, but very similar.
I surmise it is an issue with that workspace, possibly but not certainly with the new VPD , the table has these settings in vpd
GRANT SELECT ON CF.CF_PARTICIPANT_MENTOR to vpd_admin;
create or replace function cf_admin ( p_schema in varchar2, p_object in varchar2 )
return varchar2
as
l_x number;
begin
SELECT count(MENTOR_ID) into l_x FROM CF.CF_MENTORS where MENTOR_ID = nvl(v('APP_USER'),USER) and ROLES = 0;
if l_x >0 then
return '';
end if;
return 'PARTICIPANT_ID =''CF''';
end;
DBMS_RLS.add_policy
(object_schema => 'CF',
object_name => 'CF_PARTICIPANT_MENTOR',
policy_name => 'CF_PM_POL',
function_schema => 'vpd_admin',
policy_function => 'cf_admin',
statement_types => 'INSERT,DELETE,SELECT,UPDATE');
END;
I have looked in the alert_pathway.log , error.log access.log for errors and found no obvious ones.
Form creation works in other workspace, and in the same workspace on another instance.
Thanks for your guidance
FrankA free account is never charged, if you have any charges in your Bank account without your knowledge from Adobe, I would request you to provide the following details by private message so that I can get it investigated.
1. Adobe ID
2. Last four digit of credit card
3.Credit card name (visa/mastercard/Amex)
If after investigation we are unable to detect the charges then you need to dispute the amount with Bank as it might can be case of Fraud.
Regards
Rajshree -
iTunes Match has stopped uploading - every file errors and says waiting - I have tried to delete the files and use other formats etc. I have had the service since Day 1 and NEVER had an issue. It didn't start until the Delete from Cloud switch to Hide from cloud - the files that do not upload show grayed out on my other devices.
Have you confirmed that you successfull purged iTunes Match by also looking on an iOS device? If so, keep in mind that Apple's servers may be experiencing a heavy load right now. They just added about 19 countries to the service and I've read a few accounts this morning that suggests all's not running perfectly right now.
-
I have a 3G iphone. I just tried to download the new itunes and lost all my itunes I had. I tried to transfer them from my computer but can't. How can I and what do I do to get the ones I bought before and now have lost.
It has always been very basic to always maintain a backup copy of your computer.
Use your backup copy to put everything back.
If for some reason you have failed to maintain a backup ( not good), then you can transfer itunes purchases from an ipod/iphone/ipad: File>Transfer Purchases -
Trying to understand the sound system
Here's my problem. My mic didn't work (neither the front mic nor the line-in in the rear), so after some research and trial and error I found that if I do
modprobe soundcore
my mic works on both the jacks
But here's where my confusion lies. This is the output of lsmod |grep snd before probing explicitly for soundcore
[inxs ~ ]$ lsmod |grep snd
snd_hda_codec_analog 78696 1
snd_hda_intel 22122 1
snd_hda_codec 77927 2 snd_hda_codec_analog,snd_hda_intel
snd_hwdep 6325 1 snd_hda_codec
snd_pcm_oss 38818 0
snd_pcm 73856 3 snd_hda_intel,snd_hda_codec,snd_pcm_oss
snd_timer 19416 1 snd_pcm
snd_page_alloc 7121 2 snd_hda_intel,snd_pcm
snd_mixer_oss 15275 2 snd_pcm_oss
snd 57786 8 snd_hda_codec_analog,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm_oss,snd_pcm,snd_timer,snd_mixer_oss
soundcore 6146 2 snd
[inxs ~ ]$
So as you can see, soundcore's already loaded, so why do I have to explicitly load it again to get the mic to work?
Once I add soundcore to my MODULES array and reboot, the lsmod output is also the same as above.
So my question is -- what does the explicit loading of soundcore do, that is not done by auto-loading of that module?Oh... since your topic is Trying to understand the sound system, that puts you (and me) inside the whole world's population... chuckle. But I thought I'd pass along a document written by probably "The" main ALSA developer that I totally stumbled across just 3 days ago.
Go here:
http://kernel.org/pub/linux/kernel/people/tiwai/docs/
and download the flavor of your choice of the "HD-Audio" document, or simply view it online. It documents the deepest dive into the current ALSA snd_hda_* layers and issues that I've found to date (but still leaves me wanting).
Why that document isn't plastered across the interwebs is beyond me. I only get 11 hits when I search for it... such are the secrets of the ALSA world I guess.
Last edited by pigiron (2011-08-26 18:26:48) -
Trying to understand the Serialization interface
Im trying to understand the Serialization of objects?
As an example, I create a Library class that implements Serializable, that stores a collection of Book objects
If I am only looking at saving a Library object to file, does the Book class require Serialization also or just the Library?
I have read the API on serialization, no answer there, if it is it's not easy to understand or read into the API...There are some really important things to know about when doing serialization. For example one important thing to know about that not is mentioned here is that your serializable classes must define its own private static final long serialVersionUID because if you not do that will you not be able to deserialize (read in) the data you have saved later if you change anything in your serializable class. It is a bit tricky to manage files to which you have serialized different versions of your class, that is versions where you have added more serializable members to the class after you have serialized files. Well, it is not a problem if you don´t care if you have to type in all your saved data again every time you change anything instead of deserialize it (read it) from your file of course :)
Situations like this may be handled if you define your own (private) writeObject(ObjectOutputStream) and your own readObject(ObjectInputStream) methods in your serializable class but there is a better a lot smarter way to handle this. Use of a serialization proxy! how to use that is described in the excellent book Effective Java 2nd ed. With a serialzation proxy for every serializable version of your class (where a version corresponds to a version of your class with differences in its number of serializable members) may your class deserialize data written from elder versions of your class also. Actually is it first since I read the last chapter of Effective Java that I think I have myself begin to understand serialization well enough and I recommend you to do the same to learn how to use serialization in practice. -
I have just tried to update the software on my iPad and it is now asking me to connect to iTunes. The last time I did this it did not tell me to do this. I'm currently travelling and do not have my MacBook with my iTunes.Can it be resolved without iTunes
I hope that you can see this response. The forum software is acting quite bizarre today.
You really do want to restore with your own computer. There is an off chance that you might be able to backup first, but I really think it is a very slight chance now since you got the connect to iTunes screen. But on the chance that when you connect, it sees the iPad and allows a backup, I would to not have you wait to use your own Mac.
If you cannot create a backup, you will lose everything that you have put on since the date to the last backup. So of your last backup was three weeks ago, you will restore the iPad to the condition that it was in three weeks ago.
If you do a lot of traveling, using iCloud for backups might be a very good idea. I use iTunes primarily and I backup my MacBook Pro with Time Capsule, but I still use iCloud as a secondary backup. I don't have enough data that I have exceeded the free 5 GB that you get with iCloud, so I do use it just in case.
I can't explain what happened with the update, I can only tell you that it does happen to other users. I have never had a problem when I updated and I having been updating over WiFi since iOS 5 came out. Taking a guess, maybe an interruption in the connection - especially of you tried updating using a hotel's WiFi network, or a power surge maybe. Whatever the cause, it is most likely a one time thing. That doesn't help your situation I know, but hopefully it won't happen again. -
I have just tried to install the ios7 update that fixes the initial bugs in ios7 and it wouldn't complete the install - an error occurred. now my phone is frozen and inoperable. what do i need to do to fix?
Hey dougpm,
Thanks for the question. I understand you are experiencing issues updating your iPhone to iOS 7. If you have not already done so, you may want to restart or reset the iPhone:
iPhone, iPad, iPod touch: Turning off and on (restarting) and resetting
http://support.apple.com/kb/HT1430
If the above steps do not resolve the issue, you'll want to restore your iPhone with iTunes:
iOS: Unable to update or restore
http://support.apple.com/kb/HT1808
Thanks,
Matt M. -
i just tried to install the 11.4 update (or whichever one is the most recent update as of 1/26/2014) and when it failed i tried to install manually and now whenever i try to use it, i get the following error: "The application has failed to start because MSVCR80.dll was not found. Re-installing the application may fix this problem." Right after i click ok i then get this error: "Itunes was not installed correctly. Please reinstall Itunes. Error 7 (Windows error 126)." I tried to uninstall Itunes and then reinstall the 11.03 version but that didnt work either. I want to know if i copy all of the music in my itunes folder to an external without consolidating can i still transfer all my itunes music from my current windows xp pc to a brand new one and have my current itunes library in my new pc? Basically i just want to know 3 things: What exactly does consolidating the itunes library do? Can i copy, paste, and transfer my itunes library to an external and from there to a new pc? Will i be able to transfer my itunes library without consolidating the files?
I have found a temporary solution, allowing the previous version of iTunes (v. 11.1.3 (x64) in my case) to be re-installed. It will allow you to re-establish use of iTunes until the Apple software engineers fix the most recent disasterous upgrade (v. 11.1.4). Please see and follow the procedure in the following article:http://smallbusiness.chron.com/reverting-previous-version-itunes-32590.html The previous version works beautifully.
-
I have just tried to instal the latest version of itunes. It failed and I got a message saying ' An application has made an attempt to load the C runtime library incorrectly' I completely uninstalled itunes and tried to install an earlier version and got the same message. So I can no longer access my itunes files. Help
Try the following user tip:
Troubleshooting issues with iTunes for Windows updates -
I have a 4S and just tried updating to the latest iOS version and my phone went into recovery mode and iTunes says I need to restore to factory settings. Anyone know how I can fix my phone without losing all my content?
You would only be able to restore to a backup to iCloud or iTunes:
Restore from Backup
Cheers,
GB -
I am trying to understand the licensing procedures for using tabKiller for 3.5.7 firefox. Who should I contact for this? I do not have the customer service phone number for Firefox
Tab Killer is not created by Mozilla, it is created by a private individual who has made it available at no cost for other people to use.
Maybe you are looking for
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WiFi on 2G Ipod Touch is very weak
I had the OLD Ipod Touch (32Gb) and sold it to buy the new 2G Ipod Touch. So far so good. Got speakers now and I'm happy. But before (with the OLD Touch) I was able to connect to my home wireless network from anywhere in the house. Now with the NEW 2
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Structure of the flat file that uses bapi_po_create1 ?
Hi People, I am going to create a purchase order using bapi_po_create1 .... to upload the file from legacy to r3 , .what will the stucture of the flat file .......what wil be the key to diffrentiate diiferent purchase orders. ( for eg : IN vendor mas
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I have installed (and am evaluating) Oracle 9i AS. I want to connect to it from JDeveloper. AS and JDeveloper are on seperate machines. The Enterprise Manager shows OC4J to be up and running. If I execute "http://<ohs_host>:7777/j2ee/servlet/HelloWor
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Hi to All, My wife still has ios 6 on her ipad (she likes the look). I will do the 7.1 upgrade when it is released. Should there be any issues going from 6 directly to 7.1? Thanks!
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Any security hole in this programm?
The code below is a benchmarking harness for sorting algorithms. //a driver public class TestSort { static Object[] testData = { 0.3, 1.3e-2, 7.9, 3.17 public static void main(String[] args) { // TODO Auto-generated meth