Ant compiling - How to reference the jar files in your lib directory during your Ant compile process. Sample Cobertura ant build script. A sample ant build script for a standalone Java application. Scala 3 opaque types: How to create meaningful type names. Scala 3 modules: How to build modular systems. Docker cheat sheet cheatsheet. We have to compile our code,otherwise we couldn't start the program. Oh— start —yes, we could provide a target forthat.
We should package our application. Now it's only one class—but if you want to provide a download,no one would download several hundreds files Astartable jar file would be nice And it's a good practise to have a clean target, which deletes all thegenerated stuff.
Many failures could be solved just by a 'clean build'. By default Ant uses build. While having a look at the buildfile, we will see some similar steps between Ant and the Java-only commands:.
Now that we have a working buildfile, we could do some enhancements: many times you are referencing the samedirectories, main-class and jar-name are hardcoded, and while invoking you have to remember the right order of buildsteps.
Somebody told us not to use System -statements. Weuse Log4J for that, because. We store our external libraries in a new directory lib.
Log4J canbe downloaded[1] from Logging's Homepage. Create the lib directory and extract the log4j After that we have to modify our Java source file to use that library and our buildfile so thatthis library could be accessed during compilation and run. Working with Log4J is documented inside its manual. Here we use the MyApp -example fromthe Short Manual [2]. First we have tomodify the java source to use the logging framework:. Most of the modifications are 'framework overhead' which has to be done once.
The blue line is our 'old System-out'statement. Don't try to run ant —you will only get lot of compiler errors. Log4J is not on the classpath so wehave to do a little work here. This is only for thisproject and maybe you would break other environments this is one of the most famous mistakes when working with Ant.
Weintroduce Log4J or to be more precise: all libraries jar-files which are somewhere under. In this example we start our application not via its Main-Class manifest-attribute, because we could notprovide a jar-name and a classpath.
So add our class in the red line to the already defined path and start asusual. Running ant would give after the usual compile stuff :. For another layout Why we have used Log4J? No—all is hardcoded! But that is not the fault ofLog4J—it's ours.
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