Java – How to get java logging output to appear on a single line

javalogging

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

Best 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'

Related Solutions

Java – How to efficiently iterate over each entry in a Java Map

Map<String, String> map = ...
for (Map.Entry<String, String> entry : map.entrySet()) {
    System.out.println(entry.getKey() + "/" + entry.getValue());
}

On Java 10+:

for (var entry : map.entrySet()) {
    System.out.println(entry.getKey() + "/" + entry.getValue());
}

Java – Does a finally block always get executed in Java

Yes, finally will be called after the execution of the try or catch code blocks.

The only times finally won't be called are:

If you invoke System.exit()
If you invoke Runtime.getRuntime().halt(exitStatus)
If the JVM crashes first
If the JVM reaches an infinite loop (or some other non-interruptable, non-terminating statement) in the try or catch block
If the OS forcibly terminates the JVM process; e.g., kill -9 <pid> on UNIX
If the host system dies; e.g., power failure, hardware error, OS panic, et cetera
If the finally block is going to be executed by a daemon thread and all other non-daemon threads exit before finally is called

Best Answer

Related Solutions

Java – How to efficiently iterate over each entry in a Java Map

Java – Does a finally block always get executed in Java

Related Topic