Questions tagged [system.err]
21 questions
67
votes
7 answers
difference between System.out.println() and System.err.println()
What is the difference between System.out.println() and System.err.println() in Java?
user354299
- 2,945
- 5
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- 10
19
votes
3 answers
Race between System.out and System.err in java
Please consider this java code:
public class CMain {
public static void main(String[] args){
for (int i = 0; i < 10; i++) {
System.out.println("A");
System.err.println("B");
}
}
}
By a quick look at…
C graphics
- 7,308
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5
votes
1 answer
Warning/Error meaning - GbaRequest - GbaRequest: Constructor Called 222 userAgent Apache-HttpClient/UNAVAILABLE
W/System.err(27207): [DEBUG] GbaRequest - GbaRequest: Constructor Called 222 userAgent Apache-HttpClient/UNAVAILABLE (java 1.4)
Thank you in advance for the assistance. I wasn't able to find a post regarding this error I received on my project.
I…
Brandon
- 1,401
- 1
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- 25
4
votes
0 answers
System out, in and err streams declared null
I looked at java.lang.System source code and found the following lines:
public final static InputStream in = null;
public final static PrintStream out = null;
public final static PrintStream err = null;
I know that a final reference can't be…
Brrch
- 331
- 1
- 4
2
votes
1 answer
Java 8, El Capitan: System.err.println() output not reaching Console.app
Coming to grips with Java 8 on El Capitan...
I used to have exceptions print their messages to System.err and they used to appear nicely in Console.app. Now they don't, and I'm stumped figuring out what's wrong.
My main() method looks like…
skiaddict1
- 523
- 7
- 19
2
votes
1 answer
Synchronize System.out & System.err
When debugging code I tend to use System.out & System.err quite a lot. The problem is when an exception is ocurring and i use System.out the same time the outcome doesn't look very organized.
[CLIENT]:postinit:…
Vic
- 139
- 8
2
votes
4 answers
System.out.err & System.out interleaving in Java
To work out how much time is taken to perform an algorithm, I do this in the main method, but it does not print the time as it gets interleaved with System.print.
long startTime = System.currentTimeMillis();
A1.Print(2);
long endTime =…
user2015006
1
vote
1 answer
Where do messages sent to System.err go when using Tomcat externally to run a web app from IntelliJ?
I am using IntelliJ 2019.3 Ultimate edition IDE to run my Vaadin web app through Apache Tomcat web container.
When a message goes out to System.err such as:
System.err.println( "My message goes here." ) ;
…where does that message land?
On the…
Basil Bourque
- 303,325
- 100
- 852
- 1,154
1
vote
2 answers
Are Java System.in/out/err always open?
Javadoc says in, out and err are 'already open', I just wonder that do they close after program finishes? If not does it contradict the practise to close any I/O stream references after use?
mzoz
- 1,273
- 1
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1
vote
1 answer
Difference in Processing of System.err.print ans System.out.print
Is there a differnece how System.err.print and System.out.print are processed while getting executed?
I have a twodimensional array of Integers ranged between 2 and 20. The Array is printed as a Matrix and all Integers >=10 shall be printed red,…
Seb. M.
- 13
- 2
1
vote
3 answers
Reading System.Out
So, what I want to do is basically filter everything that is passed through System.out and System.err, is it possible to apply a filter of some sort or to create my own OutputStream to divert System.out with, and then process it normally?
Edit for…
Socratic Phoenix
- 556
- 1
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1
vote
1 answer
Redirect the output of System.err.println to a file without code change
I have an existing jar file that contains a class I am execution from a batch file as shown below.
java -classpath %CLASSPATH% com.xxx >> LOG_FILE_name
The class contains lot of System.out and System.err. The System.out is going to the log file…
Parvez
- 631
- 1
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- 19
0
votes
2 answers
Weird behavior when using System.err.println()
I thought that difference between System.out.println() and System.err.println() is simply in how messages are printed to console. Meaning err prints error messages (red color), while out prints standard messages. It has come to my notice that they…
Stefan
- 969
- 6
- 9
0
votes
1 answer
How to log into a string? Is there a way to capture every console output into a single string?
I use the java.util.logging Logger class, and
I would like to capture all messages on the console (not just the logs) and put them in a string (that I use later elsewhere). I did find a class that captures the println-s from System.out, but the logs…
asd
- 1
- 1
0
votes
1 answer
Error Message with System.err.println() before System.exit(-1) in Java
I have a problem with crashed Java Virtual Mashines without error message. I often do some checks in my code. Something went wrong, if one of these checks will not be fulfilled and the java program shall not carry on.
E.G.:
if(!constraint){
…
UweJ
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