How do I get java logging output to appear on a single line

Question

At the moment a default entry looks something like this   Oct 12  2008 9 45 18 AM myClassInfoHere INFO  MyLogMessageHere   How do I get it to do this   Oct 12  2008 9 45 18 AM myClassInfoHere - INFO  MyLogMessageHere   Clarification I m using java util logging

User · Answer

If you log in a web application using tomcat add   -Djava util logging ConsoleHandler formatter   org apache juli OneLineFormatter   On VM arguments

User · Answer

if you re using java util logging  then there is a configuration file that is doing this to log contents  unless you re using programmatic configuration    So  your options are  1  run post -processor that removes the line breaks 2  change the log configuration AND remove the line breaks from it  Restart your application  server  and you should be good

User · Answer

Per screenshot  in Eclipse select  run as  then  Run Configurations     and add the answer from Trevor Robinson with double quotes instead of quotes  If you miss the double quotes you ll get  could not find or load main class  errors

User · Answer

As of Java 7  java util logging SimpleFormatter supports getting its format from a system property  so adding something like this to the JVM command line will cause it to print on one line   -Djava util logging SimpleFormatter format   1 tY- 1 tm- 1 td  1 tH  1 tM  1 tS  4 s  2 s  5 s 6 s n    Alternatively  you can also add this to your logger properties   java util logging SimpleFormatter format   1 tY- 1 tm- 1 td  1 tH  1 tM  1 tS  4 s  2 s  5 s 6 s n

User · Answer

1  -Djava util logging SimpleFormatter format  Java 7 supports a property with the java util Formatter format string syntax   -Djava util logging SimpleFormatter format        See here   My favorite is   -Djava util logging SimpleFormatter format  1 tY- 1 tm- 1 td  1 tH  1 tM  1 tS  4 -6s  2 s  5 s 6 s n   which makes output like   2014-09-02 16 44 57 SEVERE org jboss windup util ZipUtil unzip  Failed to load  foo zip   2  Putting it to IDEs  IDEs typically let you set system properties for a project  E g  in NetBeans  instead of adding -D        somewhere  add the property in the action dialog  in a form of java util logging SimpleFormatter format  1 tY- 1 tm-    - without any quotes  The IDE should figure out   3  Putting that to Maven - Surefire  For your convenience  Here is how to put it to Surefire            lt  -- Surefire -- gt           lt plugin gt               lt groupId gt org apache maven plugins lt  groupId gt               lt artifactId gt maven-surefire-plugin lt  artifactId gt               lt version gt 2 17 lt  version gt               lt configuration gt                   lt systemPropertyVariables gt                       lt  -- Set JUL Formatting -- gt                       lt java util logging SimpleFormatter format gt  1 tY- 1 tm- 1 td  1 tH  1 tM  1 tS  4 -6s  2 s  5 s 6 s n lt  java util logging SimpleFormatter format gt                   lt  systemPropertyVariables gt               lt  configuration gt           lt  plugin gt    4  Hand-made  I have a library with few java util logging related classes  Amongst them  it s SingleLineFormatter   Downloadable jar here   public class SingleLineFormatter extends Formatter      Date dat   new Date      private final static String format     0 date   0 time      private MessageFormat formatter    private Object args     new Object 1         Line separator string   This is the value of the line separator      property at the moment that the SimpleFormatter was created      private String lineSeparator    String  java security AccessController doPrivileged              new sun security action GetPropertyAction  line separator       private String lineSeparator     n               Format the given LogRecord        param record the log record to be formatted        return a formatted log record         public synchronized String format LogRecord record         StringBuilder sb   new StringBuilder            Minimize memory allocations here      dat setTime record getMillis             args 0    dat           Date and time      StringBuffer text   new StringBuffer        if  formatter    null          formatter   new MessageFormat format             formatter format args  text  null       sb append text       sb append                Class name      if  record getSourceClassName      null          sb append record getSourceClassName           else         sb append record getLoggerName                   Method name      if  record getSourceMethodName      null          sb append             sb append record getSourceMethodName               sb append   -        lineSeparator        String message   formatMessage record           Level     sb append record getLevel   getLocalizedName         sb append                Indent - the more serious  the more indented        sb append  String format      s          int iOffset    1000 - record getLevel   intValue      100      for  int i   0  i  lt  iOffset   i            sb append                   sb append message       sb append lineSeparator       if  record getThrown      null          try           StringWriter sw   new StringWriter            PrintWriter pw   new PrintWriter sw           record getThrown   printStackTrace pw           pw close            sb append sw toString             catch  Exception ex                      return sb toString

User · Answer

Like Obediah Stane said  it s necessary to create your own format method  But I would change a few things    Create a subclass directly derived from Formatter  not from SimpleFormatter  The SimpleFormatter has nothing to add anymore  Be careful with creating a new Date object  You should make sure to represent the date of the LogRecord  When creating a new Date with the default constructor  it will represent the date and time the Formatter processes the LogRecord  not the date that the LogRecord was created    The following class can be used as formatter in a Handler  which in turn can be added to the Logger  Note that it ignores all class and method information available in the LogRecord   import java io PrintWriter  import java io StringWriter  import java util Date  import java util logging Formatter  import java util logging LogRecord   public final class LogFormatter extends Formatter        private static final String LINE SEPARATOR   System getProperty  line separator          Override     public String format LogRecord record            StringBuilder sb   new StringBuilder             sb append new Date record getMillis                  append                   append record getLevel   getLocalizedName                 append                    append formatMessage record                append LINE SEPARATOR            if  record getThrown      null                try                   StringWriter sw   new StringWriter                    PrintWriter pw   new PrintWriter sw                   record getThrown   printStackTrace pw                   pw close                    sb append sw toString                   catch  Exception ex                       ignore                                  return sb toString

User · Answer

This logging is specific to your application and not a general Java feature  What application s  are you running   It might be that this is coming from a specific logging library that you are using within your own code  If so  please post the details of which one you are using

User · Answer

1  -Djava util logging SimpleFormatter format  Java 7 supports a property with the java util Formatter format string syntax   -Djava util logging SimpleFormatter format        See here   My favorite is   -Djava util logging SimpleFormatter format  1 tY- 1 tm- 1 td  1 tH  1 tM  1 tS  4 -6s  2 s  5 s 6 s n   which makes output like   2014-09-02 16 44 57 SEVERE org jboss windup util ZipUtil unzip  Failed to load  foo zip   2  Putting it to IDEs  IDEs typically let you set system properties for a project  E g  in NetBeans  instead of adding -D        somewhere  add the property in the action dialog  in a form of java util logging SimpleFormatter format  1 tY- 1 tm-    - without any quotes  The IDE should figure out   3  Putting that to Maven - Surefire  For your convenience  Here is how to put it to Surefire            lt  -- Surefire -- gt           lt plugin gt               lt groupId gt org apache maven plugins lt  groupId gt               lt artifactId gt maven-surefire-plugin lt  artifactId gt               lt version gt 2 17 lt  version gt               lt configuration gt                   lt systemPropertyVariables gt                       lt  -- Set JUL Formatting -- gt                       lt java util logging SimpleFormatter format gt  1 tY- 1 tm- 1 td  1 tH  1 tM  1 tS  4 -6s  2 s  5 s 6 s n lt  java util logging SimpleFormatter format gt                   lt  systemPropertyVariables gt               lt  configuration gt           lt  plugin gt    4  Hand-made  I have a library with few java util logging related classes  Amongst them  it s SingleLineFormatter   Downloadable jar here   public class SingleLineFormatter extends Formatter      Date dat   new Date      private final static String format     0 date   0 time      private MessageFormat formatter    private Object args     new Object 1         Line separator string   This is the value of the line separator      property at the moment that the SimpleFormatter was created      private String lineSeparator    String  java security AccessController doPrivileged              new sun security action GetPropertyAction  line separator       private String lineSeparator     n               Format the given LogRecord        param record the log record to be formatted        return a formatted log record         public synchronized String format LogRecord record         StringBuilder sb   new StringBuilder            Minimize memory allocations here      dat setTime record getMillis             args 0    dat           Date and time      StringBuffer text   new StringBuffer        if  formatter    null          formatter   new MessageFormat format             formatter format args  text  null       sb append text       sb append                Class name      if  record getSourceClassName      null          sb append record getSourceClassName           else         sb append record getLoggerName                   Method name      if  record getSourceMethodName      null          sb append             sb append record getSourceMethodName               sb append   -        lineSeparator        String message   formatMessage record           Level     sb append record getLevel   getLocalizedName         sb append                Indent - the more serious  the more indented        sb append  String format      s          int iOffset    1000 - record getLevel   intValue      100      for  int i   0  i  lt  iOffset   i            sb append                   sb append message       sb append lineSeparator       if  record getThrown      null          try           StringWriter sw   new StringWriter            PrintWriter pw   new PrintWriter sw           record getThrown   printStackTrace pw           pw close            sb append sw toString             catch  Exception ex                      return sb toString

User · Answer

This logging is specific to your application and not a general Java feature  What application s  are you running   It might be that this is coming from a specific logging library that you are using within your own code  If so  please post the details of which one you are using

User · Answer

This is what I m using   public class VerySimpleFormatter extends Formatter        private static final String PATTERN    yyyy-MM-dd T HH mm ss SSSXXX         Override     public String format final LogRecord record            return String format                    1 s  2 -7s  3 s n                   new SimpleDateFormat PATTERN  format                          new Date record getMillis                      record getLevel   getName    formatMessage record              You ll get something like     2016-08-19T17 43 14 295 09 00 INFO    Hey  2016-08-19T17 43 16 068 09 00 SEVERE  Seriously  2016-08-19T17 43 16 068 09 00 WARNING I m warning you

User · Answer

This is what I m using   public class VerySimpleFormatter extends Formatter        private static final String PATTERN    yyyy-MM-dd T HH mm ss SSSXXX         Override     public String format final LogRecord record            return String format                    1 s  2 -7s  3 s n                   new SimpleDateFormat PATTERN  format                          new Date record getMillis                      record getLevel   getName    formatMessage record              You ll get something like     2016-08-19T17 43 14 295 09 00 INFO    Hey  2016-08-19T17 43 16 068 09 00 SEVERE  Seriously  2016-08-19T17 43 16 068 09 00 WARNING I m warning you

User · Answer

I ve figured out a way that works  You can subclass SimpleFormatter and override the format method      public String format LogRecord record            return new java util Date           record getLevel           record getMessage       r n           A bit surprised at this API I would have thought that more functionality flexibility would have been provided out of the box

User · Answer

Like Obediah Stane said  it s necessary to create your own format method  But I would change a few things    Create a subclass directly derived from Formatter  not from SimpleFormatter  The SimpleFormatter has nothing to add anymore  Be careful with creating a new Date object  You should make sure to represent the date of the LogRecord  When creating a new Date with the default constructor  it will represent the date and time the Formatter processes the LogRecord  not the date that the LogRecord was created    The following class can be used as formatter in a Handler  which in turn can be added to the Logger  Note that it ignores all class and method information available in the LogRecord   import java io PrintWriter  import java io StringWriter  import java util Date  import java util logging Formatter  import java util logging LogRecord   public final class LogFormatter extends Formatter        private static final String LINE SEPARATOR   System getProperty  line separator          Override     public String format LogRecord record            StringBuilder sb   new StringBuilder             sb append new Date record getMillis                  append                   append record getLevel   getLocalizedName                 append                    append formatMessage record                append LINE SEPARATOR            if  record getThrown      null                try                   StringWriter sw   new StringWriter                    PrintWriter pw   new PrintWriter sw                   record getThrown   printStackTrace pw                   pw close                    sb append sw toString                   catch  Exception ex                       ignore                                  return sb toString

User · Answer

Similar to Tervor  But I like to change the property  on runtime    Note that this need to be set before the first SimpleFormatter is created - as was  written in the comments       System setProperty  java util logging SimpleFormatter format                  1 tF  1 tT  4 s  2 s  5 s 6 s n

User · Answer

This logging is specific to your application and not a general Java feature  What application s  are you running   It might be that this is coming from a specific logging library that you are using within your own code  If so  please post the details of which one you are using

User · Answer

This logging is specific to your application and not a general Java feature  What application s  are you running   It might be that this is coming from a specific logging library that you are using within your own code  If so  please post the details of which one you are using

User · Answer

I ve figured out a way that works  You can subclass SimpleFormatter and override the format method      public String format LogRecord record            return new java util Date           record getLevel           record getMessage       r n           A bit surprised at this API I would have thought that more functionality flexibility would have been provided out of the box

User · Answer

if you re using java util logging  then there is a configuration file that is doing this to log contents  unless you re using programmatic configuration    So  your options are  1  run post -processor that removes the line breaks 2  change the log configuration AND remove the line breaks from it  Restart your application  server  and you should be good

User · Answer

Like Obediah Stane said  it s necessary to create your own format method  But I would change a few things    Create a subclass directly derived from Formatter  not from SimpleFormatter  The SimpleFormatter has nothing to add anymore  Be careful with creating a new Date object  You should make sure to represent the date of the LogRecord  When creating a new Date with the default constructor  it will represent the date and time the Formatter processes the LogRecord  not the date that the LogRecord was created    The following class can be used as formatter in a Handler  which in turn can be added to the Logger  Note that it ignores all class and method information available in the LogRecord   import java io PrintWriter  import java io StringWriter  import java util Date  import java util logging Formatter  import java util logging LogRecord   public final class LogFormatter extends Formatter        private static final String LINE SEPARATOR   System getProperty  line separator          Override     public String format LogRecord record            StringBuilder sb   new StringBuilder             sb append new Date record getMillis                  append                   append record getLevel   getLocalizedName                 append                    append formatMessage record                append LINE SEPARATOR            if  record getThrown      null                try                   StringWriter sw   new StringWriter                    PrintWriter pw   new PrintWriter sw                   record getThrown   printStackTrace pw                   pw close                    sb append sw toString                   catch  Exception ex                       ignore                                  return sb toString

User · Answer

If you log in a web application using tomcat add   -Djava util logging ConsoleHandler formatter   org apache juli OneLineFormatter   On VM arguments

User · Answer

As of Java 7  java util logging SimpleFormatter supports getting its format from a system property  so adding something like this to the JVM command line will cause it to print on one line   -Djava util logging SimpleFormatter format   1 tY- 1 tm- 1 td  1 tH  1 tM  1 tS  4 s  2 s  5 s 6 s n    Alternatively  you can also add this to your logger properties   java util logging SimpleFormatter format   1 tY- 1 tm- 1 td  1 tH  1 tM  1 tS  4 s  2 s  5 s 6 s n

User · Answer

Like Obediah Stane said  it s necessary to create your own format method  But I would change a few things    Create a subclass directly derived from Formatter  not from SimpleFormatter  The SimpleFormatter has nothing to add anymore  Be careful with creating a new Date object  You should make sure to represent the date of the LogRecord  When creating a new Date with the default constructor  it will represent the date and time the Formatter processes the LogRecord  not the date that the LogRecord was created    The following class can be used as formatter in a Handler  which in turn can be added to the Logger  Note that it ignores all class and method information available in the LogRecord   import java io PrintWriter  import java io StringWriter  import java util Date  import java util logging Formatter  import java util logging LogRecord   public final class LogFormatter extends Formatter        private static final String LINE SEPARATOR   System getProperty  line separator          Override     public String format LogRecord record            StringBuilder sb   new StringBuilder             sb append new Date record getMillis                  append                   append record getLevel   getLocalizedName                 append                    append formatMessage record                append LINE SEPARATOR            if  record getThrown      null                try                   StringWriter sw   new StringWriter                    PrintWriter pw   new PrintWriter sw                   record getThrown   printStackTrace pw                   pw close                    sb append sw toString                   catch  Exception ex                       ignore                                  return sb toString

User · Answer

Per screenshot  in Eclipse select  run as  then  Run Configurations     and add the answer from Trevor Robinson with double quotes instead of quotes  If you miss the double quotes you ll get  could not find or load main class  errors

User · Answer

I ve figured out a way that works  You can subclass SimpleFormatter and override the format method      public String format LogRecord record            return new java util Date           record getLevel           record getMessage       r n           A bit surprised at this API I would have thought that more functionality flexibility would have been provided out of the box

User · Answer

I ve figured out a way that works  You can subclass SimpleFormatter and override the format method      public String format LogRecord record            return new java util Date           record getLevel           record getMessage       r n           A bit surprised at this API I would have thought that more functionality flexibility would have been provided out of the box

User · Answer

if you re using java util logging  then there is a configuration file that is doing this to log contents  unless you re using programmatic configuration    So  your options are  1  run post -processor that removes the line breaks 2  change the log configuration AND remove the line breaks from it  Restart your application  server  and you should be good

User · Answer

if you re using java util logging  then there is a configuration file that is doing this to log contents  unless you re using programmatic configuration    So  your options are  1  run post -processor that removes the line breaks 2  change the log configuration AND remove the line breaks from it  Restart your application  server  and you should be good

User · Answer

Similar to Tervor  But I like to change the property  on runtime    Note that this need to be set before the first SimpleFormatter is created - as was  written in the comments       System setProperty  java util logging SimpleFormatter format                  1 tF  1 tT  4 s  2 s  5 s 6 s n

[java] How do I get java logging output to appear on a single line?

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