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STEP FOUR: IMPOSING STRUCTURE
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URI = file:C:/AntBook/secondbuild/build.xml Project base dir set to: C:\AntBook\secondbuild Build sequence for target `archive is [init, compile, archive] Complete build sequence is [init, compile, archive, clean] init: compile: [javac] org\example\antbook\lesson1\Main.java omitted as C:\AntBook\secondbuild\build\org\example\antbook\ lesson1\Main.class is up to date. archive: [jar] org\example\antbook\lesson1\Main.class omitted as C:\AntBook\secondbuild\dist\project.jar is up to date. BUILD SUCCESSFUL Total time: 2 seconds
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The verbose run provides a lot of information, much of which may seem distracting. When a build is working well, you do not need it, but it is invaluable while developing that file.
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If ever you are unsure why a build is not behaving as expected, run Ant with the -verbose option to get lots more information.
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How Ant handles multiple targets on the command line Here is an interesting question which expert users of Make will usually get wrong: what happens when you type ant compile archive at the command line Many people would expect Ant to pick an order that executes each target and its dependencies once only: init, compile, archive. Make would certainly do that, but Ant does not. Instead, it executes each target and dependents in turn, so the actual sequence is init, compile, then init, compile, archive:
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C:\AntBook\secondbuild>ant compile archive Buildfile: build.xml init: [mkdir] Created dir: C:\AntBook\secondbuild\build [mkdir] Created dir: C:\AntBook\secondbuild\dist compile: [javac] Compiling 1 source file to C:\AntBook\secondbuild\build init: compile: archive: [jar] Building jar: C:\AntBook\secondbuild\dist\project.jar BUILD SUCCESSFUL Total time: 2 seconds
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This behavior can be unexpected to anyone experienced in other build tools, as it seems to add extra work rather than save work by sharing dependencies. However, if you 38
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GETTING STARTED WITH ANT
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look closely, the second time Ant executes the compile target it does no work; the tasks get executed but their dependency checking stops existing outputs being rebuilt. Our next question is this: when a target lists multiple dependencies, does Ant execute them in the order listed The answer is yes, unless other dependency rules prevent it. Imagine if we modified the archive target with the dependency attribute depends="compile,init". A simple left-to-right execution order would run the compile target before it was initialized. Ant would try to execute the targets in this order, but because the compile target depends upon init, Ant will call init first. This subtle detail can catch you out. If you try to control the execution order by listing targets in order, you may not get the results you expect as explicit dependencies always take priority.
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STEP FIVE: RUNNING OUR PROGRAM
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We now have a structured build process that creates the JAR file from the Java source. At this point the next steps could be to run tests on the code, distribute it, or deploy it. We shall be covering how to do all these things in the following chapters. For now, we just want to run the program.
Why execute from inside Ant We could just call our program from the command line, stating the classpath, the name of the entry point and the arguments:
>java -cp build/classes org.example.antbook.lesson1.Main a b . a b .
If the classpath is not complex and the arguments to the application are simple, calling Java programs from the command line is not particularly hard, just a manual process. We still want to run our program from the build file, not just to show it is possible, but because it provides some tangible benefits the moment we do so: A target to run the program can depend upon the compilation target, so we know we are always running the latest version of the code. It is easy to pass complex arguments to the program. It is easier to set up the classpath. The program can run inside Ant s own JVM; so it loads faster. You can halt a build if the return code of the program is not zero. The fact that the execute target can be made to depend on the compile target is one of the key benefits during development. There is simply no need to split program compilation from execution.
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