System.our and System.err
Hi,
Is there a buffer size for system.out and System.err.
If so how can we retrieve the buffer size.
Thanking You,
Chamal.
There is no way to determine the characteristics of the OutputStream behind System.out or System.err.
You could provide your own streams (via setOut() and/or setErr() methods)...
Why do you need to know?
Similar Messages
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System.out and System.err
Hi all,
This is a stupid newbie question, but I could not find the answer on the Web
site, so here goes: Where do System.out and System.err get written to? I'm
trying to deploy some plain-vanilla stateless session beans that do a bunch
of println() calls, but I can't see the output anywhere! The WebLogic
Console shows no messages, /myserver/weblogic.log has nothing interesting,
and there are no .log files anywhere that I can see. I even searched /tmp
and found nothing of interest. What am I missing? Do I have to explicitly
open a file for System.out and/or System.err? That doesn't sound right...
- danzThe simple answer to your questions are no and no.
I recently logged a problem with BEA WebLogic technical support regarding
this issue and their response is:
You have two choices. You can either use standard Java file i/o to write
your output to a file, or you can use our t3loggingservices to append
messages into the weblogic.log
The "jump point" for the logging services is at --
http://www.weblogic.com/docs51/classdocs/javadocs/weblogic/common/LogService
sDef.html
It is actually very easy to use -- after you import the proper packages into
your web application it is just as easy to use as System.out.println.
John J. Feigal Voice (651)766-8787 (main)
Sr. Technical Consultant (651)766-7249 (direct)
Ensodex, Inc. Fax (651)766-8792
4105 N. Lexington Ave., Suite 150 email [email protected]
Arden Hills, MN 55126 WebSite http://www.ensodex.com
"Jon Wynett" <[email protected]> wrote in message
news:[email protected]...
I'm running WebLogic as an NT Service. Is there any way to see the
System.out.println messages? Can they be redirected to the weblogic.log
file?
We were running through a DOS Window and saw all the messages, however we
ideally want to run Weblogic as a service.
"Rob Woollen" <[email protected]> wrote in message
news:[email protected]...
I'm guessing that you started the server with the .exe file on Windows.
If you're debugging with printlns, it's generally more conventient to
use the startWebLogic.sh or startWebLogic.cmd files to start the server
from a shell.
By default, you'll see stdout and stderr in the window.
-- Rob
Dan Zivkovic wrote:
Hi all,
This is a stupid newbie question, but I could not find the answer on
the
Web
site, so here goes: Where do System.out and System.err get written to?I'm
trying to deploy some plain-vanilla stateless session beans that do abunch
of println() calls, but I can't see the output anywhere! The WebLogic
Console shows no messages, /myserver/weblogic.log has nothinginteresting,
and there are no .log files anywhere that I can see. I even searched/tmp
and found nothing of interest. What am I missing? Do I have toexplicitly
open a file for System.out and/or System.err? That doesn't soundright...
- danz -
How to capture System.err and System.out in a method?
Is there some way to capture everything that is sent to System.err or System.out and have it instead go to e.g. a method as a String?
The reason I want to do is this: I am invoking some method from a class that sends output to System.err and System.out but while that method is run, I want everything that goes to System.out or System.err to instead go to a String buffer or a Swing Scroll Pane.
What is the easiest way to do this?I want everything that goes to System.out or System.err to instead go to a String buffer or a Swing Scroll Pane.Then maybe you should be searching (and then posting) in the Swing forum. Thats where I've seen this question asked and answered many times in the past.
-
System.out and System.err How to get to show up in log
Does anyone know if there is anyway to get System.out and System.err
messages to appear in the log?
Trying to build and debug a JSP project is a complete nightmare when the
remote developers cannot see System.out or System.err messages from helper
classes.
Platform= Windows NT 4.0
Weblogic running as a Service
Thanks in advance!Write a wrapper class to redirect the std out to what ever stream you want.
HTH
Saman -
System.out and System.err to files
Hi !
Could somebody tell me, how I can forward all System.out.println and System.err.println Messages from
my Java modules (EJB, Servlets) to different files respectively.
Thanks
SteveI think you could create PrinStreamS from your desired output files and then use System.setOut(<...>) and System.setErr(<...>). Place this code in a servlet that you load at startup...
-
Temporarily routing System.out and System.err to a String
Hi everybody,
Does anyone know of a way to temporarily route System.out and System.err directly from the console into a String, then set it back to its default to the console? I know how to reroute to a text area:
TextAreaOutputStream taos = new TextAreaOutputStream(yourTextArea);
PrintStream ps = new PrintStream(taos);
System.setErr(ps);
System.setOut(ps);But it doesn't seem like there is either a way to reroute to a String or a way to switch back to the default routing afterward. Can anyone give me some advice on how to do this, please?
Thanks,
Jezzica85Too late to the party?
import java.io.*;
public class Redirection {
public static void main(String[] args) {
System.out.println("To console");
PrintStream old = System.out;
ByteArrayOutputStream baos = new ByteArrayOutputStream();
PrintStream ps = new PrintStream(baos);
System.setOut(ps);
System.out.println("To memory");
System.out.print("No 'ln'");
//System.out.flush(); //needed?
System.setOut(old);
System.out.println("To console again?");
System.out.println("earlier I wrote...");
byte[] data = baos.toByteArray();
String message = new String(data);
System.out.println(message);
} -
Rerouting System.out and System.err
Hi everybody,
I'm trying to make a small application with an agnostic back end that can print out its progress messages to either the console or a JTextArea, depending on whether the console front end or GUI front end is called. I originally created a small utility class that the agnostic back end extended, in which one could set a variable which told it to use the JTextArea or console. The solution seems a bit clumsy to me, though, so it crossed my mind; does anyone know if there is a way, in the main method of a program, to reroute System.out and System.err to a desired location?
Basically, I'd like functionality like this:
Console front end:
1. Start main
2. Create object for back end
3. All calls to System.out and System.err in back end route to console, as usual
GUI front end:
1. Start main
2. Create Object for back end
3. Create GUI
4. Set System.out and System.err to show up in GUI text field
5. All calls to System.out and System.err in back end route to text field in GUI
Is this possible? I have my somewhat hacked solution working fine, but I don't want to start ripping it apart too badly until I know if something simpler like this can work. Can anyone point me in the right direction, please?
Thanks,
Jezzica85Thanks for the explanation scphan,
In that case, I don't think that's exactly what I'm looking for.
To answer both your question and cotton's:
What I want to to is directly reroute System.out and System.err to a text area, only if I'm using a GUI. I'll try and explain it all, so if it gets long please bear with me--
I have 3 classes, Calculate, Console, and GUI.
Calculate is the back end of my application. Console is a front end class that allows the actions of Calculate to be run on the command line. GUI is a front end class that allows the actions of Calculate to be shown in a text area.
I currently have a class, Output, that Calculate extends, and uses to print out progress/error messages. Output has a JTextArea data member, and print/println data members. If the JTextArea is null, calling the print methods prints to the console, and if not, the print methods print to the text area. So, at the current moment, I have a solution similar to that which scphan described (although I didn't recognize the terminology at first--apologies, it's almost 3 AM here).
What I was wondering is if there is a simpler, more elegant way to do this. I have a few different small applications that have a similar setup to this one, and all the background classes must extend the Output class to work. If creating a class that every back end class must extend is the best way to do this, then I won't mess with what I have, but if there is a more elegant solution I've overlooked, I'd like to use that instead.
I hope that's clear, sorry if there was any confusion.
Thanks,
Jezzica85 -
Replace System.out and System.err
Hi there,
i got an Applet/Application Hybrid and i want to replace the System.out and System.err - Stream with my personal Streams.
When started as an Application it shell be given out to a file and when started as an Applet it shell be given out to the current HTML-Document...
But how do i realize that with the Applet. The thing with the Application and the file works fine, so don�t worry about that..
so in short my question is:
how can i replace/modify the System.out and System.err Streams in a way so that the output will be given the current HTML-Document when started as an Applet?
thx anyway
cu Errraddicatori know this method, but i don�t know how to make a PrintStream that gives the input to the HTML-Document...
excuse me if my kind of expressions were not so excactly...
thx anyway
cu Errraddicator -
OPMN system.out and system.err log rotation?
I would like to rotate the log generated by OPMN by default for system.out & system.err, which is named:
OC4J~APPNAME~home~default_island~1
I see the entries in the opmn.xml file for the ons.log and ipm.log which ARE being rotated properly. I've read that you can redefine the log file for system.out and system.err, but can't find any about rotating these logs.
Does anyone have any info about this topic?If anyone's curious and is trying to do this themselves, I eventually asked Oracle, who stated it could not be done.
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Difference between System.err and System.out
Hi Everyone !!!
I could see that System.err is printing an output on the screen as like the System.out.
I can't understand what is System.err.
Can anyone explain me the difference between System.out and System.errSystem.out.println -> Sends the output to a standard output stream. Generally monitor.
System.err.println -> Sends the output to a standard error stream. Generally monitor.
To find the difference execute the following program and see the output. You will see how those streams can be handled differently.
public class test
public static void main(String args[])
System.out.println("Standard output Stream message");
System.err.println("Standard error stream message");
Compile the class.
Run the class
First Execution -
java test
Standard output Stream message
Standard error stream message
Second Execution -
java test >op.txt
Standard error stream message
In second execution we diverted only the std output stream and std err stream remained unchanged. i.e., by this way, we can handle error stream separately.
Another typical use of this stream is to produce log or debug messages at runtime and are diverted them to a file where they are archived for later use.<img class="emoticon" src="images/emoticons/shocked.gif" border="0" alt="" width="16" height="16" /> -
System.out.println() and System.err.println()
Can any one tell me the difference between System.out.println()
and System.err.println() ?Can any one tell me the difference between
System.out.println() Sends the output to the 'stdout' stream
and System.err.println() ?sends the output to the 'stderr' stream.
http://en.wikipedia.org/wiki/Standard_input -
How does javaw (WinXP) threats System.err and System.out?
Hi, I just faced a problem which is most likely caused by the blocking of System.err.
So I'm interested in the default handling of theses streams by javaw.
I would except that they point to something like "/dev/null" (compared to Unix), but the behavior is different.
I'm sure about this, cause redirecting these streams had fixed my problem.
(see http://forum.java.sun.com/thread.jspa?messageID=9516593)
Thanks a lot in advance.
Greetings Michael
The entry from the registry:
"C:\Programme\Java\jre1.6.0\bin\javaw.exe" -jar "%1" %*"Bumping.
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[Feature Request] Seperate tab in log window for System.err
By default, the stack traces of exceptions (and throwables in general) are printed to the System.err stream. So, wouldn't it be useful to include a 2nd tab for System.err messages?
It could be optional to either include or leave out the System.err output in the System.out tab.
The whole idea of this 2nd tab is to set it up like the search output tab: a tree-like list which can be expanded to see the stack trace of each exception that occured during runtime. A small parser can parse the stack trace when an exception is printed on the System.err stream and format it.
If this option would be availble in the debugger only, that would be ok too, I guess. Although, the debugger already has some other means of jumping through code when an exception is thrown (ie, when the debugger 'pauses' runtime).I've logged an Enhancement request to improve the handling of System.err messages (2811508). There are ways to enhance the treatment of System.err messages without introducing a new tab, through the use of color, links back to the source code, and collapsing of entire stack traces to a single line (with a button to see the entire trace).
Thanks!
-- Brian -
Passing System.out/System.err as parameters
I'm sure there must be a simple answer to this that I'm just not seeing, suggestions please.
I have a method in a logging utility that takes either a PrintWriter or a Printstream parameter as a target for logging and a second method that closes the log.
In principle either System.out or System.err could be passed in either directly or wrapped in a PrintWriter.
In the closing method I want to determine if one of these two PrintStreams were passed and if so skip the close() operation so as not to lose connectivity to stdout or stderr.
In the case of the PrintStream parameter I can use an identity check and condition a boolean to control closing the file.
The problem is the PrintWriter, if the utility user wraps these PrintStreams.
1: As I understand it closing the PrintWriter will cause the underlying OutputStream to close.
2: Since it's a protected field the underlying OutputStream is not visible to me.
3: I don't wish to subclass PrintWriter if there's another way to solve the problem.
Any ideas?Why don't you use a BufferedWriter() ?
-
Redirecting System.err on a mobile phone?
Hi,
Is there a way of redirecting System.err? Unfortunately, System.setErr does not exist in MIDP, so I haven't been able to write my own PrintStream to replace err.
I need to know what the output of Exception.printStackTrace() is at a certain point. There is certainly a way of accessing System.err, otherwise it wouldn't be present in MIDP ... .
Thanks!
StefanHi
J2ME Polish provides a logging framework, which offers different logging levels and the ability to view logging messages on real devices.
Mihai
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