In Eclipse, how can I write a debug statement to a console window? I tried:
System.out.print(urls);
System.out.println(urls);
Log.d("tag", urls);
But I don't see the values being displayed anywhere.
Thanks.
Create a console and write to it. When a console is created, you give it a name. That way your console output can be kept separate from other plugin's console output. See this article for details.
http://wiki.eclipse.org/FAQ_How_do_I_write_to_the_console_from_a_plug-in%3F
Are you sure you have the console window in eclipse setup to display output? On the menu bar in eclipse, go to Window->Show View->Console. When you run the program, that console window should be where your System.out.print(ln) output is displayed.
If you are running some kind of client-server application, you may actually have multiple consoles. If you see a console, there should be a little arrow icon next to it. Use that to dropdown a list of all the various consoles, and pick the appropriate one.
My output goes to the LogCat tab, not the Console.
If you are running any class having main method and want to print logs on eclipse console, then create a file "log4j.properties" in src/main/resources
If you want to print log in your test classes then put this file in src/test/resources.
log4j.properties
log4j.rootLogger=INFO, DEBUG, WARN, ERROR, stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%C:%L] [%t] - %m%n
log4j.logger.backtype.storm=DEBUG
log4j.logger.clojure.tools=DEBUG
try this , it will output in console tab
System.out.print("Hello World ..... !");
// Redirect the stdout and stderr to the LogPanel
SystemLogger out = new SystemLogger(System.out, Level.INFO);
SystemLogger err = new SystemLogger(System.err, Level.ERROR);
System.setOut(out);
System.setErr(err);
I assume your code is in Java? If you want to use a logger that will print out to your console similarly to "system.out.println();", add java.util.logging to your eclipse project. import java.util.logging.Logger;
Then inside each class where you want output to your console, add private static final Logger LOG = Logger.getLogger(<your_class_name>.class.getName()); replacing with your class name.
And where you want console output, put a line in that part of your class like LOG.info("code got to this point!"); similarly to how you would use system.out.println();
I only use the logger instead of system.out.println(); statements because the logging seems more professional. And frankly the logger is less key strokes to write log.info than system.out.println, which saves time.
This article is where I learned the logging info: https://examples.javacodegeeks.com/core-java/util/logging/java-util-logging-example/
There is a simple way to switch between client and server outputs in eclipse. Please see the screenshot which shows an option to toggle between the console outputs.
Eclipse screenshot to show console option
Related
How do I print text or values to the console to validate that my model is working correctly?
I would like to do something like this:
class Main
operations
public Run: () ==> ()
Run() ==
print "Text"
print mon.Func()
end Main
It seems to be possible, but I just cant figure out how to do it.
You need to use the VDM IO library. There are a couple of operations that do what you want - println (for printing fixed values) and printf, which has parameter substitution. So you would call IO`println("hello"), for example.
In the latest release of Overture and VDMJ, you can also use a VDM annotation to print values without adding anything to the "content" of the specification itself. Annotations are rather added as comments. See #Printf.
Nick Battle answered my question but for other beginners to VDM, there is missing a detail to his answer, how to include libraries.
Before one can use the IO library, you first have to include it.
I am using Overture and to include libraries into your project, you have to right-click on the project in the side menu and press New > Add VDM Library.
You can then choose which libraries you want to include in a menu that pops up.
Here you choose IO.
After this you should be able to print out values using the IO`println(val) function.
I have a tLogRow component that logs the output of tSetGlobalVar and tContextDump. I have exported the job, and in the zip file I found a log4j which makes me think it is using this for the tLogRow component. Now, my question is how can I specify the log level for the tLogRow component? as I'll be only wanting to see its log on WARN or maybe DEBUG level.
And for my tLogRow component I have checked "Print content with log4j".
Thank you in advance!
This is not the use case of tLogRow component, its just to dislay a flow to console. The check box of using log4j does not change the content of the output, its about to change the api of writing. To change the settings of log4j in Talend, you can go to the top left of screen, the menu file then edit the project properties and you find this screen :
As #54l3d mentioned above, tLogRow component seems not be the ideal component for logging using log4j. I have achieved this via tJava instead:
org.apache.log4j.Logger logger = org.apache.log4j.Logger.getLogger(this.getClass());
logger.debug("MY_CONTEXT_NAME: " + context.MY_CONTEXT_NAME);
logger.debug("GLOBAL MAP paramA: " + globalMap.get("paramA"));
For the globalMap's values logging, please note that if the your tJava component that's performing the log is within the same subjob as the tSetGlobalVar, the value you have set will not be immediately reflected. I was only able to log the values set when it is on a different subjob than tSetGlobalVar.
I was wondering if anyone's aware of a plugin for eclipse which will just put a simple timestamp on each line of console output.
I've had a look around at some other questions which have answers detailing how to enable timestamps on the output through the code itself, but it'd be nice to just have a print of the current system time for each line of output for any application I decide to run without requiring code edits.
Surely it's a pretty simple feature? Am I missing something blindingly obvious?
Edited to add: I'm using Eclipse Kepler.
The way I see it , you have two possibilities.
Possibility One
Make user of any of the logging frameworks out there. Like slf4j, log4j and logback .
Possibility Two
You won't be able to achieve it via the System.out.println(), but you can write up a custom printer function that does the job for you. Something like
//Set any date format you would like here
private static DateFormat dateFormat = new SimpleDateFormat("yyyy MMM dd HH:mm:ss");
//Make calls to the method with the message that you want to print
private static void customDisplay(String message){
System.out.println("["+dateFormat.format(new Date())+"] " + message);
}
So now instead of making a call to System.out.println(), make a call to your method
customDisplay("Some message that will be displayed with timestamp")
Edit
As far I know, we can not configure much about the eclipse's console output except for setting up the scheme and some colour look and feel.
I wanted to run a bat file in which it can import preferences from a location (which was exported manually). I searched for the command which would import preferences but, could not find any.
There is no existing code to do this. You would have to write an Eclipse headless application that does something like this:
IPreferencesService service = Platform.getPreferencesService();
IExportedPreferences prefs = service.readPreferences(file input stream);
// TODO create IPreferenceFilter array to filter what you want
service.applyPreferences(prefs, filter array);
See the source of the import preferences page org.eclipse.ui.internal.wizards.preferences.WizardPreferencesImportPage1 for an example.
Backstory: I was looking for something similar and, a few tabs back, I've stumbled on a "half-an-answer"/alternative solution. Even if the thread is old might still turn in handy ...
In this page the author talks about using -pluginCustomization parameter inside the eclipse.ini file
-pluginCustomization
plugin_customization.ini
-startup
plugins/org.eclipse....
The plugin_customization.ini file is similar to the *.epf file, same variables minus the /instance/ prefix (maybe because this way they are interpreted/applied at product(eclipse) level and not as per-workspace preferences).
We have several applications that use log4j for logging. I need to get a log4j parser working so we can combine multiple log files and run automated analysis on them. I'm not looking to reinvent the wheel, so can someone point me to a decent pre-existing parser? I do have the log4j conversion pattern if that helps.
If not, I'll have to roll our own.
I didn't realize that Log4J ships with an XML appender.
Solution was: specify an XML appender in the logging configuration file, include that output XML file as an entity into a well formed XML file, then parse the XML using your favorite technique.
The other methods had the following limitations:
Apache Chainsaw - not automated enough
jdbc - poor performance in a high performance distributed app
You can use OtrosLogViewer with batch processing. You have to:
Define you log format, you can use Log4j pattern layout parser or Log4j XmlLayout
Create java class that implements LogDataParsedListener. Method public void logDataParsed(LogData data, BatchProcessingContext context) will be called on every parsed log event.
Create jar
Run OtrosLogViewer with specifying your log processing jar, LogDataParsedListener implementation and log files.
What you are looking for is called SawMill, or something like it.
Log4j log files aren't really suitable for parsing, they're too complex and unstructured. There are third party tools that can do it, I believe (e.g. Sawmill).
If you need to perform automated, custom analysis of the logs, you should consider logging to a database, and analysing that. JDBC ships with the JdbcAppender which appends all messages to a database of your choice, but it has performance implications, and it's a bit flaky. There are other, similar, alternatives on the interweb, though (like this one).
You -can- use Log4j's Chainsaw V2 to process the various log files and collect them into one table, and either output those events as xml or use Chainsaw's built-in expression-based filtering, searching & colorizing support to slice & dice the logs.
Steps:
- Start Chainsaw V2
- Create a chainsaw configuration file by copying the example configuration file available from the Welcome tab - define one LogFilePatternReceiver 'plugin' entry for each log file that you want to process
- Start Chainsaw with that configuration
- Each log file will end up as a separate tab in the UI
- Pause the chainsaw-log tab and clear the events from that tab
- Create a new tab which aggregates the events from the various tabs by going to the 'view, crate custom expression logpanel' menu item and enter 'level >= DEBUG' in the box. It will create a new tab containing events from all of the tabs with level >= debug (which is why you cleared the chainsaw-log tab).
You can get an overview of the expression syntax used to filter, colorize and search from the tutorial (available from the Help menu).
If you don't want to use Chainsaw, you can do something similar - start a simple app that doesn't log but loads a log4j.xml config file with the 'plugin' entries you defined for the Chainsaw configuration, but also define a FileAppender with an xmllayout - all of the events received by the 'receivers' will be sent to the single appender.