System.out.println() Ignored

I have a open source JDBC driver which has to be enhanced.
It is compiled with ant. I tried to code in my new methods for enhancing it and wanted to print the intermediate variables through System.out.println(). This particular line for printing onto the console is ignored and remaining code is working fine.
Can someone tell me where I went wrong?

Junnu wrote:
Can someone tell me where I went wrong?You went wrong in assuming that line is "ignored." It's not. So one of the following must be true:
1. That line is never reached because the code branch it's in is not executed.
2. That line is never reached because an exception occurs.
3. That line is being executed, but System.out has been redirected away from the console by System.setOut().
4. That line is being executed, but System.out has been redirected away from the console by the command line, such as using > in linux.
5. That line is being executed, but there's an error. Try System.out.checkError().
6. That line is being executed, but System.out's buffer has not filled up so it's not appearing on the terminal. System.out.flush() would fix this, but this is not a likely scenario. I think that System.out is created with autoflushing enabled, but I may be mistaken.

Similar Messages

Is there a way to make system.out.println() scroll down as it goes?

I am writing a program where I want to be able to read what's printed out in the console of my IDE through System.out.println() as the program runs/after the program runs. However, right now I run the program, the message prints out, and then when I go to read it the scroll bar is all the way up so I can see only the top of the print-out (the first thing printed out). Is there any way I can get the console to scroll along with the text, kind of like floating boxes you see on various websites for various reasons? In other words, can I get it so that when I look in the console at any given moment of the program running, I am looking at the newest text printed out (the text at the bottom of the "page")? Thank you!

That would be an IDE problem and not a Java one. You could redirect output into a text file so you can read at your leisure and scroll up and down as much as you like.

Is there a way to force System.out.println to run when called

I working on my first threaded program and having a hard time debugging. I've used System.out.println to let me know what's going on but due (I assume) to the nature of threads the output is not sequential. Is there a way to force println to execute immediatly so that they show up in the order they were called?
Thanks --- Mike

mjs1138 wrote:
endasil, Thanks for the reply. I'm currenlty running the program from within the NetBeans IDE. It is the output displayed by in NetBeans "output" that I'm looking at.
--- MikeI don't use Netbeans, but I would guess that it too pipes Standard Out and Standard Error to the same console. You didn't address my comment. Are you printing to System.err as well? This happens implicitly if you use Exception.printStackTrace(), for example.

32-bit JDK 7 System.out.println not working in IDE

Hi folks,
I have a 64-bit Windows 7 OS.
Due to 3rd party library/jar dependencies, i had to install the 32-bit Java JDK 1.7 and Eclipse IDE.
I also installed NetBeans.
So i have a 64-bit OS and am running 32-bit Java JDK/JRE & IDEs.
The problem I am having is that my program's System.out.println("...") statements are not outputting strings to either IDE debug console.
Executing the compiled program from a command line/prompt produces the expected string output.
The basic "Hello, World" program is enough to cause this behaviour to start occurring.
I have not manually / intentionally changed any IDE-specific Debug Console or Windows environment settings.
One caveat: This same environment has worked successfully in the past ?! Yes, this is one of those "..it worked last week & yesterday and today it isn't and i swear i didn't do anything..." issue.
Thoughts ?

Thanks for the reply.
The 64-bit versions of Java & Eclipse were installed first.
When i discovered I had to use the 32-bit versions, i un-installed the 64-bit ones & installed the 32-bits.
Even after that initial un-install 64-bit/install 32-bit process, it was working.
I have also been installing the Windows 7 64-bit OS updates when i am informed of them.
I'm not sure if any of these would affect how the Eclipse / NetBeans IDEs behave.
Behaviour has been inconsistent.
Initially it was always working.
But over the past several days, it has been working less and less.
I don't have any large data structures.
This isn't a large complicated program, couple hundred lines, so i highly doubt that i'm doing anything to the resources, but something has changed.
The main project I am working on takes command line parameters, does some initial processing, produces output using System.out.printlns [SOP] then depending on the parameters, branches into 2 different processing paths, let's call them A & B. Each of these processing paths also use SOPs. When i run the program in the IDE going thru path A, sometimes the initial SOP statements will work and the SOP statements specific to path A will also work. If i immediately change the parameters to go thru path B & re-run it, not even the initial SOP statements before the branching decision work.
I've tried doing System.flush()s too - no affect.
I haven't tried the re-direction option to a file option you mentioned yet.
It always works from a command prompt - that is telling me that the Java SOPs are working properly, correct ?
Inside an Eclipse or NetBeans IDE, SOP output to the debug console is inconsistent.
Running from a command prompt, the SOPs always work.
It'd help to know if this an IDE issue, a Java issue, a Windows 7 issue so i can narrow down where to try and correct the situation.
I have a Windows XP VM set up, i'll try running the program there and see if there's a difference.
Thanks for your reply.

How can i put a system.out.println into txt file

i want to generate a txt file instead of system.out.println. for the output How can i do that and what code can i use for that??
Edited by: crystalarun on Oct 14, 2007 11:40 AM

suppose u ant output in "Output.txt"
then code can be
PrintStream out = new PrintStream(new FileOutputStream("Output.txt"));
System.setOut(out)

System.out.println () is not working properly

Hi, Why does this happens:
Object temp=null;
System.out.println ("temp is null? "+temp==null);
just prints: true
expected: temp is null? true
Why does this happens????
If I do System.out.println ("temp is null? "+(temp==null)); it works bu it should work without the pharentesis too

MelGohan wrote:
Hi, Why does this happens:
Object temp=null;
System.out.println ("temp is null? "+temp==null);
just prints: trueThat is odd, mine prints "false".
type Test126.java
public class Test126 {
    public static void main(String[] args) {
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        System.out.println ("temp is null? "+temp);
        System.out.println ("temp is null? "+temp==null);
}javac Test126.java
java Test126
temp is null? null
false

System.out.println in Web Dynpro Java

I call System.out.println in some components in web dynpro java. But I cannot find the standard console output file of SAP J2EE Engine. Anyone know where is the location of standard output file?

Thanks Deepak. Your link blog is working.
Sreeni: I cannot find a start-up log file. Could you please tell me the real path?
Edited by: Nuttakorn Boonthamtanarung on Apr 1, 2010 6:58 AM

System.out.println not working in Tomcat-4.1.x

System.out.println not working in Tomcat-4.1.24. Any settings has to be enabled??? I am using tomcat for Solaris

I think u can use ServletContext.log() to output info instased.

Where to see the System.out.println() messages

I deploy my application in Oracle9ias . I have some System.out.println() statements in java class files.
When I run the application I need to know where I can see those println() statements.

The Member Feedback forum is for suggestions and feedback for OTN Developer Services. This forum is not monitored by Oracle support or product teams and so Oracle product and technology related questions will not be answered. We recommend that you post this thread to the Application Server-General forum. The URL is:
Oracle Application Server - General

Where to see the System.out.println statements on soa server.

Hi,
I have generated some proxy classes in my jdeveloper. And I have deployed that project to the admin server on my soa_domain.
Now my java files have some System.out.println statements. I want to see those values.
Can anyone please let me know where I can see those statements on server.
What s the file name where i can see.
do i have to enable some debigging on the server. if yes then for what level i need to enable the log at what level.
Thanks
Anoop

Hi,
System.out.println is not really a good way to debug in weblogic... If you didn't configure where the stdout will go those messages can end up going nowhere...
I suggest you use one of these...
This will go to the soa*diagnostic logs... for example DOMAIN_HOME/servers/soa_server1/soa_server1-diagnostic.log...
import java.util.logging.Level;
import java.util.logging.Logger;
import oracle.fabric.logging.LogFormatter;
    private static final Logger soa_logger = Logger.getLogger("oracle.soa.Logger");
    static {
        LogFormatter.configFormatter(soa_logger);
        soa_logger.log(Level.INFO, message);
        soa_logger.log(Level.INFO, message, t);or
This will go to the server logs... for example DOMAIN_HOME/servers/soa_server1/soa_server1.log...
import weblogic.logging.NonCatalogLogger;
    private static NonCatalogLogger weblogic_logger = new NonCatalogLogger("SomeMeaningfulNameHere");
        weblogic_logger.notice(message);
        weblogic_logger.notice(message, t);Usually info and notice will go to the logs by default, you can try with higher levels (error,warning) as well or you can tweek the server debug level to use lower levels...
Cheers,
Vlad

System.out.println - Hello World Example

Hi All
I am using Apache Tomcat and trying t produce a simple output to the browser. Cannot get System.out.println to work. See code and out below:
begin code
<HTML>
<HEAD><TITLE>hello jsp</TITLE></HEAD>
<BODY>
<%@ page language='java' contentType='text/html' %>
<%
String message = "Hello World";
message = message + "\nAFTER";
System.out.println("BEFORE");
%>
<%= (message) %>
</BODY>
</HTML>
END code
--begin browser output
Hello World AFTER
end browser ouput
Would be grateful if someone could explain why the System.out.print statement cannot be seen in the browser output.
many thanks
Naresh

System.out prints to System.out. What that is depends:
In applets, (which the OP was not talking about) it is the Java Console.
In JSP, it's the same as any application by default.
You can change in Java what System.out prints to, but you don't often do this. But in JSP it doesn't print to the browser. JSP is not CGI, which does you the standard out as the destination for written data.

Redirect system.out.println() to a file

hi all,
how can i redirect all the console prints to a txt file in java application? i have used system.out oftenly in many class throught the
application. is there any way to redirect all those console prints to a
txt file by converting or assigning the System.out stream to a stream for filewriter or
somthing like that, so that whenever system.out.println() is executed
the content is written to a file insted of on the console.
thanks in advance
Sojan

Actually,System.setOut(new PrintStream(new FileOutputStream("output.txt"), true));
System.setErr(System.out);since setOut wants a PrintStream and not just some OuputStream...

Print System.out.println messages into logs of Weblogic Application Server

Hi,
I use Weblogic Application Server 10.3.6 on Windows 7. The Enterprise Application (J2EE) is deployed into the 'AdminServer' of Weblogic. For debugging purpose, I have added a few System.out.println statements.
I am unable to see the print messages on any of log files available in path 'user_projects > domains > base_domain > servers > AdminServer > logs'. However, I can see them on the 'command' prompt which was used to start the server. How can I get them into one of the log files? What am I missing?
I tried reading other threads on the forum and as per them 'System.out.println' gets logged onto *.out logs which I am unable to find. Only base_domain.log, AdminServer.log, access.log are available in the location.
More Specifics:
Configuration on WLS console 'Home > Servers > AdminServer > Logging'
Log file name: logs/AdminServer.log
Min. Severity to log: Notice (tried with Debug as well)
Advanced Options:
Logging Implementation: JDK
Redirect stdout logging enabled: False (tried both options)
Log file Severity Level: Notice (tried with Debug as well)
Standard Out Severity Level: Notice (tried with Debug as well)
Thanks

Paul,
I just found this on google:
'Generally, developers put a lot of System.out.println statements in their code to perform application debugging. Normally, all standard outputs and error outputs are routed to the console where the OC4J server is started. If you want to capture the standard output and error outputs to files for logging/debugging purposes, then you can use the -out and -err options while starting up the Oc4J server to specify which files to use.'.
http://www.onjava.com/pub/a/onjava/2002/01/16/oracle.html?page=2

Functionality of System.out.println()

Hello,
can some one please explain me what happens
an System.out.println(); is called
for example when we are pass an Object reference of some class
it prints the address
what functionality is taking place internally.
which methods are called.

You can look for yourself. The source code for the classes in the core API is in src.zip in the JDK download.

System.out.println capture to buffer

Hi All,
My application runs other application in back. How can I capture system.out.println() written by another application & display via dialog box.
Like :execl() or execv() function in C runtime library. Where every printf() message printed to passed buffer.
Thank you,
Avin Patel

If i understand your question correctly, you should execute command for you help.html file. The system will run default browser.
such as:
void runBrowser(String file)
{String cmd = null;
     Process p;
          try {
               String os = System.getProperty("os.name");
               if (os != null && os.startsWith("Windows")) {
                    if (os.startsWith("Windows 9") || os.startsWith("Windows Me"))
                    // Windows 9x/Me
                         cmd = "start " + file;
else
                    // Windows NT/2000/XP
                         cmd = "cmd /c start " + file;
p = Runtime.getRuntime().exec(cmd);
catch(IOException x)
// couldn't exec browser
System.err.println("Could not invoke browser, command=" + cmd);
}

System.out.println() Ignored

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