Zones and blocks
What are zone blocks in JSP and how to use them. Is there any site which provides tutorials on the zones and blocks. Also can i get some sample source code for zones implementation in JSP. Zones are mentioned in Chapter 9 of Professional JSP by WROX Publications, but not in detail. Please sugget some source to learn it.
In general, it is best to avoid blocks (never heard of zones) in JSP. I'm assuming a block is a scriptlet section of code such as:
<%
someObject.someMethod();
for(int i=0; i < 24; i++)
someOtherObject.someOtherMethod();
%>
The suggested development pattern is to follow MVC (Model View Controller) standards. This is where the JSP serves as the view which renders the output from Beans and serlvets and taglibs serve as the controller interacting with a data source which is considered the model. Scriptlets are great for ad-hoc debugging and simple pages where complex design is not necessary. They are also a good starting point for Java newbies seeking to learn how JSP logic flows. They are not good, however, for scalable production systems involving elaborate HTML page design and/or complex business rules.
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SQL Timeouts and Blocking Locks
SQL Timeouts and Blocking Locks
Just wanted to check in and see if anyone here has feedback on application settings, ColdFusion settings, JBOSS settings or other settings that could help to limit or remove SQL Timeouts and blocking locks on SID's.
We're using MS SQL 2000 with JBOSS and IIS5.
We've been seeing the following error in our logs that starts blocking locks in SQL:
java.sql.SQLException: [newScale] [SQLServer JDBC Drive] [SQLServer] Lock request time out period exceeded.
Once this happens, we're hosed until we remove the blocking SID in SQL. These are the connections to the application.
Any feedback would be great. Thanks!Hi
This is your exact solution:
Select a.username, a.sid, a.serial#, b.id1, c.sql_text
From v$session a, v$lock b, v$sqltext c
Where b.id1 in( Select distinct e.id1
from v$session d , v$lock e
where d.lockwait = e.kaddr ) and
a.sid = b.sid and
c.hash_value = a.sql_hash_value and
b.request =0;
Thanks
Sarju
Oracle DBA
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by I'm clueless:
Can someone give me the SQL statement to
show if there are any blocking database locks and if so - which user is locking the Database?
Thanks in Advance<HR></BLOCKQUOTE>
null -
I downloaded a movie from iTunes on my iPhone 4S, went out of the wifi zone and now my movie is no where to be found. I can't find it on my iPhone, Mac or iPad. Where is it?
Sounds like the movie didn't finish downloading before the Wi-Fi signal dropping ...
Try re downloading. You won't be charged again.
Downloading past purchases from the App Store, iBookstore, and iTunes Store -
On previous iPhones you could go to settings and block the the actual text message from pooping up. Only the sender would show up. On the i4gs the sender and message show up. This is a major flaw as far as privacy. There are no options with in settings to stop this from happening. PLEASE TELL ME IM WRONG ???
YOU ARE WRONG.
Go to Settings > Notifications > Messages. You can turn Notifcation Center off for Messages, or select None for the alert style, and turn Show Preview off, and view in Lock Screen on or off. -
I would like to understand what is major difference between Dead Locks and Blocking Locks in Oracle. If someone could explain or point me to good web Link I would really appreciate
Thanks.Tony's advise is very good.
In simple terms a blocking lock is a lock being held by one session that is preventing another session from performing an DML operation on the same data until the holding session commits or rollbacks.
A deadlock is a situation where two or more sessions lock data in such a manner as each session is waiting on a resource held by another session so that none of the session can complete their unit of work. That is session A locks row 1 then session B locks row 2 followed by session A attempts to lock row 2 while session B now attemps to lock row 1. Neither session A or B will ever be able to complete thier transaction releasing the locks and allowing waiting sessions to process since each session is waiting on a resource that the other session has while holding a resource the other session needs. In other words a deadlock. Oracle detects deadlocks and kills one of the sessions freeing resources.
HTH -- Mark D Powell -- -
Hello,
I have a Win7 PC. I want to block all incoming connections except 3 or 4 IPs. How can i do this?
I created a new rule to block all connections using this steps:
Inbound rules > New Rule > Custom > All Programs > All Protocols / Ports > All Local/Remote IPs > Block the connectiion > All profiles > Then i gave a name
This rule works fine and blocks all incoming connections.
Then i want to create a new rule to allow specific IPs using this steps:
Inbound rules > New Rule > Custom > All Programs > All Protocols / Ports > Remote IPs: 192.168.10.5, 192.168.10.10 > Allow the connection > All profiles > Then i gave a name
But 192.168.10.5 and 192.168.10.10 couldn't reach W7 machine.
(If rules are disabled or FW is off; both IPs could reach W7 machine)
ThanksHi,
How did you check these two IP address? Through remote access? According to your description, it should only allow remote IP could access this computer. Please also allow local IP for test.
Roger Lu
TechNet Community Support -
Firm Zone and Trade off Zone in Scheduling Agreement
Dear All
Please explain in detailed the concept of Firm Zone and Trade off Zone in Scheduling Agreement, and it's effects in MRP run, i.e. If i take a MRP run for a material whci is having firm zone as 30 days and trade off zone as 60 days then what will be the result of MRP. The Material MRP type is VB
Thanks and Regards
ManojHi,
Firm zone is the time frame in which you cannot change your orders (schedule lines) that you have ordered from a vendor in any way (Date change nor quantity change).
Trade off zone is time frame within which you can make changes to your procurement proposals, these changes are acceptable from vendor's side.
These time frames are agreed with the Vendor and then inserted for each scheduling agreement in 'Additional data'.
For your example if you take firm zone 30 days and trade-off zone 60 days, the check starts from current day on which MRP runs. For exampe current day is 1st Oct, all the procurement proposals with delivery date within 30 days that is till 1st September are firm orders, which MRP will not change in any case (You can find such orders with * in front of them in MD04 list). Beyond 1st september they are in trade off zone, in which MRP can modify them.
MRP types (VB in your case) have no correlation with these zones.
Amit G -
When you are typing the addresses into a Yahoo! Mail, the browser helps you by suggesting people from your address book in a drop down box.
But when I've finsihed that mail and open up a new one, old addresses remain on screen and block the "copy to" box. You can't click on them or zap them, they are just fixed on screen.
Have had this probelm for a long time, through many Firefox updates and also having moved to a new Mac.Reset it by holding the power and home buttons at the same time until you see the Apple logo, then release.
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I'm trying to burn a dvd from idvd but I keep getting error message, broken assets, but when I check my drop zones and their content there's no error messages on any of them?
Hi
And if You change view - in main "window/view field" so that You see the box-plot structure.
No exclamation marks there either ?
and non at the front page ?
iDVD do not copy Your material - only points to where it is stored. So if on any external hard disks, USB-memories, CDs or DVDs are missing - assetts are broken.
Or if You changed location of any material or directed iPhoto or iTunes or GarageBand to a new Library - Then iMovie/iDVD also get's lost.
Yours Bengt W -
Tablespaces and block size in Data Warehouse
We are preparing to implement Data Warehouse on Oracle 11g R2 and currently I am trying to set up some storage strategy - unfortunately I have very little experience with that. The question is what are general advices in such considerations according table spaces and block size? I made some research and it is hard to find some clear answer, there are resources advising that block size is not important and can be left small (8 KB), others state that it is crucial and should be the biggest possible (64KB). The other thing is what part of data should be placed where? Many resources state that keeping indexes apart from its data is a myth and a bad practice as it may lead to decrease of performance, others say that although there is no performance benefit, index table spaces do not need to be backed up and thats why it should be split. The next idea is to have separate table spaces for big tables, small tables, tables accessed frequently and infrequently. How should I organize partitions in terms of table spaces? Is it a good idea to have "old" data (read only) partitions on separate table spaces?
Any help highly appreciated and thank you in advance.Wojtus-J wrote:
We are preparing to implement Data Warehouse on Oracle 11g R2 and currently I am trying to set up some storage strategy - unfortunately I have very little experience with that. With little experience, the key feature is to avoid big mistakes - don't try to get too clever.
The question is what are general advices in such considerations according table spaces and block size? If you need to ask about block sizes, use the default (i.e. 8KB).
I made some research and it is hard to find some clear answer, But if you get contradictory advice from this forum, how would you decide which bits to follow ?
A couple of sensible guidelines when researching on the internet - look for material that is datestamped with recent dates (last couple of years), or references recent - or at least relevant - versions of Oracle. Give preference to material that explains WHY an idea might be relevant, give greater preference to material that DEMONSTRATES why an idea might be relevant. Check that any explanations and demonstrations are relevant to your planned setup.
The other thing is what part of data should be placed where? Many resources state that keeping indexes apart from its data is a myth and a bad practice as it may lead to decrease of performance, others say that although there is no performance benefit, index table spaces do not need to be backed up and thats why it should be split. The next idea is to have separate table spaces for big tables, small tables, tables accessed frequently and infrequently. How should I organize partitions in terms of table spaces? Is it a good idea to have "old" data (read only) partitions on separate table spaces?
It is often convenient, and sometimes very important, to separate data into different tablespaces based on some aspect of functionality. The performance thing was mooted (badly) in an era when discs were small and (disk) partitions were hard; but all your other examples of why to split are potentially valid for administrative. Big/Small, table/index, old/new, read-only/read-write, fact/dimension etc.
For data warehouses a fairly common practice is to identify some sort of aging pattern for the data, and try to pick a boundary that allows you to partition data so that a large fraction of the data can eventually be made read-only: using tablespaces to mark time-boundaries can be a great convenience - note that the tablespace boundary need not match the partition boudary - e.g. daily partitions in a monthly tablespace. If you take this type of approach, you might have a "working" tablespace for recent data, and then copy the older data to "time-specific" tablespace, packing it and making it readonly as you do so.
Tablespaces are (broadly speaking) about strategy, not performance. (Temporary tablespaces / tablespace groups are probably the exception to this thought.)
Regards
Jonathan Lewis -
Question About Java Threads and Blocking
I'm helping someone rehost a tool from the PC to the Sun. We're using the Netbeans IDE and the Java programming language. I took a Java course several years ago, but need some help with something now. We're developing a front-end GUI using Swing to allow users to select different options to perform their tasks. I have a general question that will apply to all cases where we run an external process from the GUI. We have a "CommandProcessor" class that will call an external process using the "ProcessBuilder" class. I'm including the snippet of code below where this happens. We pass in a string which is the command we want to run. We also instantiate a class called "StreamGobbler" my coworker got off the Internet for redirecting I/O to a message window. I'm also including the "StreamGobbler" class below for reference. Here's the "CommandProcessor" class:
// Test ProcessBuilder
public class CommandProcessor {
public static void Run(String[] cmd) throws Exception {
System.out.println("inside CommandProcessor.Run function...");
Process p = new ProcessBuilder(cmd).start();
StreamGobbler s1 = new StreamGobbler("stdin", p.getInputStream());
StreamGobbler s2 = new StreamGobbler("stderr", p.getErrorStream());
s1.start();
s2.start();
//p.waitFor();
System.out.println("Process Returned");
Here's the "StreamGobbler" class:
import java.lang.*;
import java.io.*;
// Attempt to make the output of the process go to the message window
// as it is produced rather that waiting for the process to finish
public class StreamGobbler implements Runnable {
String name;
InputStream is;
Thread thread;
public StreamGobbler (String name, InputStream is){
this.name = name;
this.is = is;
public void start(){
thread = new Thread (this);
thread.start();
public void run(){
try{
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
while (true){
String s = br.readLine();
if (s == null) break;
System.out.println(s);
//messageWindow.writeToMessageArea("[" + name + "]" + s);
is.close();
catch(Exception ex){
System.out.println("Problem reading stream" + name + "...:" + ex);
ex.printStackTrace();
The "CommandProcessor" class calls two (2) instances of the "StreamGobbler" class, one for "stdin" and one for "stderr". My coworker discovered these are the 2 I/O descriptors that are needed for the external command we're running in this case. We're actually called the Concurrent Versions System (cvs) command from the GUI. Here's what we need it to do:
We want to display the output real-time as the external process is executing, but we want to block any actions being performed on the GUI itself until the process finishes. In other words, we want to show the user any generated output from the process, but don't want to alllow them to perform any other actions on the GUI until this process has finished. If we use the "waitFor()" function associated with a process, it blocks all external process output until the process has completed and then spews all the output to the screen all at once. That's NOT what we want. Also, if we don't use the "waitFor()" function, the code just continues on as it should, but we don't know how to block any actions on the GUI until this process has finished. My coworker tried the following code, but it also blocked any output until the process had finished:
while (s1.thread.isAlive() || s2.thread.isAlive())
// We really don't do anything here
I'm pretty sure we have to use threads for the output, but how do we instantly show all output and block any GUI actions?
Thank you in advance for your help!You're talking about a GUI, but there's nothing in that code which is putting events into the GUI update thread. You also say that nothing happens to the GUI until the CommandProcessor.Run() method returns if you wait for the process.
This implies that you're calling CommandProcessor.Run() in an ActionListener. This will block the GUI thread until it completes.
I was going to explain what to do, but a quick Google informed me that there's a new class which is designed to help in these situations SwingWorker (or as a [separate library|https://swingworker.dev.java.net/] if you're not up-to-date yet). -
I disabled and blocked my phone when it was stolen, i have retrieved the phone and restored service. Now when i turned it on it says iphone disabled connect to itunes.. I have and no change, what do i do?
You need to restore the phone in itunes in order to use it again, You will have to put the phone into recovery mode and restore to factory settings http://support.apple.com/kb/ht1808
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Acrobat 7 mandatory update failing with error 16820 and blocking the use of the program
Acrobat 7 mandatory update failing with error 16820 and blocking the use of the program
Sorry I can't get the screen print to upload
It says
Mandatory Update Available
A Mandatory version of this application is available for download. Application can't continue without installing this version.
Application: Acrobat_com
Installed version: 2.0.0.0
Update Version : 2.3.0.0
Download now Quit
Release notes ( this is blank)
After selecting 'Download Now' I get the following message;
Download failed
There was an error downloading the update. Error #16820
Close -
How to read particular Sector and Block in Mifare 1k through Java?
Hi Friends..
Do you know how to read particular Sector and Block in Mifare 1K through Java?..
I've created the simple application that read data from Mifare 1K, but i've problem when i want to read the other sectors and blocks..
i tried to read the blocks by using this APDU command :
FF B0 00 00 10 //read data in Sector 0 and Block 0
FF B0 00 01 10 //read data in Sector 0 and Block 1
FF B0 00 02 10 //read data in Sector 0 and Block 2
FF B0 00 03 10 //read data in Sector 0 and Block 1How to read the other sectors and blocks?..
I've tried to read data in Sector 1 and Block 5, so i tried to send this APDU command : FF B0 01 05 10, but i got this error : *6986*
Actually, it doesn't matter if i use MifareWnd, but i want to create my own application that Read/Write From/into Mifare 1K..
Please help me regarding this..
Thanks in advance..
Edited by: Leonardo_Carreira on Mar 31, 2010 2:47 AM
Edited by: Leonardo_Carreira on Mar 31, 2010 2:50 AMHi Sidd,
You should check out the Example Finder under Hardware Input and Output»IMAQ»Signal Input and Output for examples of triggering in framegrabbers.
Stephen Meserve
National Instruments -
Error with internet plug-in message and blocked plugin
On my MacBook Air Im receiving a error with internet plug-in message and blocked plugin which will not allow video clips to play i.e. YouTube. How do I correct this?
When you have installed the latest version of Flash, relaunch Safari and test.
If you're getting a "blocked plug-in" error, then in System Preferences… ▹ Flash Player ▹ Advanced
click Check Now. Quit and relaunch your browser, but check this also:
http://support.apple.com/kb/HT5655?viewlocale=en_US&locale=en_US which also covers ‘blocked plug-in’.
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