I seem to be getting run-time errors in my project when using javac for incremental builds. Is this type of workflow supported? For example, if A.java depends on B.java, and B.java is modified; will javac recompile A.java because its dependency changed?
Right now I'm using a javac ant build-task for compiling:
<javac destdir="${classes.dir}"
srcdir="${src.dir}"
source="${javac.version}"
debug="${javac.debug}"
deprecation="${javac.deprecation}"
includeantruntime="build.sysclasspath=last">
<classpath refid="compile.classpath" />
<classpath refid="junit.classpath" />
</javac>
Since you're using ant, check out the depend task.
The javac command line compiler will compile every source file given on the command line, and additionally everything on which these depend, if they don't have newer class files.
The ant javac task tries to be a bit smarter, to avoid compiling always everything - it recompiles only those files which have changed (i.e. are newer than their respective class files). This does not pay attention to the case that maybe the dependency of some class changed, and thus other classes need to be recompiled too.
In my current project, I simply do ant clean whenever I have problems on tests (and of course before any production deployment), which deletes all class files. But as vanza said, there is the depend task whose task is to find and delete all classes who depend on your changed classes - run this before your javac task and you should be good.
It depends on what has changed in B.java. If nothing changed that affected how the class is presented to A, then javac doesn't need to recompile A.java for the changes to take effect.
That said, if you are seeing behavior where you believe old code is being loaded and run, I'd be more suspicious of the deployment/packaging process than the compilation process. YMMV.
Related
I was given 20 xml files which are run when the build.xml is called.... I was asked to clear the junk in those files. How do I identify the unused tasks in those xml files?
There's probably no simple, fool-proof solution to this (you'd really just have to ask everyone in your company what they're using), however one very useful tool I like to use with complicated Ant scripts is the "Grand" graphing tool. https://ant-grand.github.io/Grand/grand.html
Download the library and place it in a lib directory, then create a new Ant script like this:
<?xml version="1.0"?>
<project default="graph">
<typedef classpath="lib/grand.jar" resource="net/ggtools/grand/antlib.xml" />
<target name="graph">
<grand buildfile="${script.file}" output="${script.file}.dot">
<filter name="prefixed" />
</grand>
<exec executable="dot">
<arg line="-Grankdir=TB -Tpng ${script.file}.dot -o ${script.file}.png"/>
</exec>
</target>
</project>
Now you can call the script with
ant -f graph.xml -Dscript.file=/path/to/ant/script/build.xml
and you will end up with a build.xml.png image file that shows a clean target dependency tree for whichever script you pointed it to.
I've added an image that was generated from one of my own relatively complicated scripts as an example. When a target has an arrow pointing to another target, that means the former is using the latter as a dependency (and thus the latter can't be removed without disrupting the former). Anything that isn't being pointed to as a dependency can be removed without hurting anything else, however that doesn't necessarily mean it's useless on its own.
Is there a way to get ant to execute multiple depend targets multiple times. Consider this:
<target name="buildall" depends="mycommon,myDAO" />
<target name="myCommon" depends="initCommon, clean, makedir, compile" description="">
<echo> Build completed for myCommon </echo>
</target>
<target name="myDAO" depends="initDAO, clean, makedir, compile" description="">
<echo> Build completed for myDao </echo>
</target>
I would like buildAll to call myCommon, which calls initCommon, clean, makedir, compile, then call myDAO which calls initDAO, clean, makedire, compile.
So I want the clean, makedir and compile tasks to be executed multiple times. They are generic and run based on properties set in the initXXX task.
I tried this:
<target name="buildall">
<antcall target="myCommon" />
<antcall target="myDao" />
</target>
but that runs everything outside of tasks everytime which is not what I want. Any thoughts?
First: Do not use <antcall/> it's usually a sign you've done something wrong.
Now, understand that Ant is not a programming language where you tell Ant what you want to do and the order you want it to be done. Ant is a matrix dependency language. You merely tell Ant what you want (I want to build this jar), and let Ant figure out what it should do. Ant does its very best not to run a target multiple times.
For example, both myCommon and myDAO call the clean target. Ant duly notes that both require clean target, and then calls clean once and only once before it runs both of your targets. It's the way Ant is suppose to work.
So, let Ant do its job. First, Thou shall not clean under normal circumstances. Builds are suppose to minimize rebuilding in order to speed up a task. If you haven't modified a *.java file, why should you force me to rebuild the corresponding *.class file?
Second: Don't double up dependencies: For example, if I want to build the target myDAO, I want to compile the code (maybe build a jar or war). That's all my myDAO target should depend upon. Now, when I compile, I might need to make my directory, and when I make my directory, I might need to do my init:
<target name="clean">
<echo>Clean up my working directory to be nice and sparkly</echo>
</target>
<target name="initDAO">
<echo>Initialize stuff for my DAO build</echo>
<echo>Maybe setup some properties?</echo>
</target>
<target name="makedir"
depends="initDAO">
<echo>I need my directories for building.</echo>
<echo>But first, I need to setup stuff"</echo>
</target>
<target name="compile"
depends="makedir">
<echo>I need to compile my dao source"</echo>
<echo>But first, I need to make the necessary directories</echo>
<target>
<target name="myDAO"
depends="compile">
<echo>Here's where I package up my DAO</echo>
<echo>But I have to compile stuff before I can package it</echo>
</target>
Note the above structure. If I run the target myDAO, Ant will look at the dependencies and then run initDAO, makedir, compile, and finally myDAO to package everything up. Again, I have a clean target that will restore my working space to pristine (before anything was built) condition, but I don't call it as part of a package because I don't want to redo work.
"Ah!", you say, "But I have to clean up because myCommon and myDAO use the same directories for building and packaging."
Well don't do that. Instead, make sure your two packages use different target directories for building and packaging. This way, you don't have to clean up the mess from one to another. And, you can change a single source file, rebuild, and not have to recompile everything again.
You can save yourself from trouble by defining macros to handle stuff in common between the two. For example, you might be able to define a compile macro that takes as its parameters the name of a source directory and it will create a destdir based upon that source directory name and compile your common and DAO targets.
So, let Ant work its magic. Use dependencies not as a means of telling Ant how to do something, but merely telling Ant that a particular target depends upon another target. Let Ant figure out the order of execution. Also, don't set up your tasks to require you to scrub directories and reinitialize everything. You want Ant to help minimize the build by not having to rebuild or recopy over files that haven't changed.
I have few target that I need to execute. I create a target naming all of them but I think it's not the way to do it ? Here is the target run that call all other target :
<target name="test.all" depends="build
echolaunching agent /echo
antcall target="RunJtfTests" /
antcall target="launchOpenAgent" /
antcall target="run.test" //target
target name="run.test" depends="build, launchOpenAgent, runJtfTests"
echo Launching test/echo
echo message="${toString:iControlSilk4J.classpath}" /
<java classname="com.miranda.icontrol.silk4j.installation.AdministrationCtrl"
classpath><fileset dir="${lib.dir}"
include name="**/*.jar" />
/fileset
pathelement path="${iControlSilk4J.classpath}" /
pathelement location="${jarPath}/Admin.jar" /
/classpath
</java>
</target>
It doesn't run and I do it to get the report and I get nothing ? What is wrong ? From what I read, antcall is like a goto loop which is not good. I want to call tests instead.
-> Here are all the tests I want to execute :
init
clean
AdministrationCtrl.Rollback
AdministrationCtrl.LatestInstallation
AdministrationCtrl.BackupiControl,
AdministrationCtrl.ChangeService
AdministrationCtrl.DefaultSetting
AdministrationCtrl.InitFailOver
AdministrationCtrl.RunDensite2Service
AdministrationCtrl.RunDensiteService
AdministrationCtrl.RunGSMService
AdministrationCtrl.RunLoudnessAnalyzerService
AdministrationCtrl.RunLoudnessLoggerService
AdministrationCtrl.RunRouterManagerService
AdministrationCtrl.RunttyR0Service
AdministrationCtrl.RunVirtualService
AdministrationCtrl.RestoreBkp
but this can be more general (regarding tests I will add in Silk4J). Is there a way to be more generic ?
Repeat after me:
Ant is not a programming language. It's a dependency matrix language.
This is an important distinction. You don't tell Ant what to execute. You tell Ant what you need, and Ant will figure out what to do.
I can tell you're having problems understanding Ant with all of those <antcall/>. That is a no-no because it could make you execute tasks more than once. Your build file also makes no sense.
Use the target's dependency parameter. For example, here's a skeleton build.xml file:
<project>
<target name="clean"/>
<target name="prepare"/>
<target name="compile"
depends="prepare"/>
<target name="package"
depends="compile"/>
<target name="test-compile
depends="compile"/>
<target name="test"
depends="test-compile"/>
<target name="deploy"
depends="package"/>
<target name="post-test-results"
depends="test"/>
<target name="all"
depends="clean,post-test-results,deploy"/>
</project>
When I want to run my target all, I mainly mean I want to do a clean build, post my test results, and deploy the build. This is true with Makefiles too. I don't list all of my tasks. Why do I care if I do my prep work for compilation? It's not my concern.
So I call, all, and that will call clean, post-test-results, and deploy. I have no idea what Ant will do beyond calling these three targets.
Wait... What do I need to do in order to post my test results? Well, I may need to run my tests. Therefore, I have a dependency to test for my post-test-results target. But, in order to run my tests, I may have to compile them. So, there's a dependency to test-compile on my test target.
In order to compile my tests, I have dependencies on the regular Java code. So, test-compile will depend upon compile. In order to compile, I have to prepare. Maybe that's building the necessary structure, or downloading the required jars. That's called before compile. Now, I can deploy. However, before I can deploy, I need to package my deployment. So, deploy depends upon package.
Package itself depends upon compile, but so did my compile-test. Since I've already called compile, my package target doesn't have to do that. All it has to do is package up the already compiled class files.
Thus, I'll probably execute the following targets in this order:
clean
prepare
compile
test-compile
post-test-results
package
deploy
My all target does hit all of my other targets, but I didn't have to list them all as dependencies or force them to build via <antcall/>s.
It looks like you need to learn about Ant and how it works. Your sample Ant file is simply not valid. Ant uses an XML style structure. All tasks are XML style entities.
Fortunately, there are a lot of good books on Ant. I would recommend Manning's Ant in Action as a good starting point.
One of the things you will find out is that you can specify batches of junit tests in a single <junit> task. This can be done via one or more <batchtest> sub-entities on the <junit> task. The <batchtest> will run all classifies that match a particular criteria. You can also use the <test> sub-entity on the <junit> task. The <test> sub-entity allows you to specify individual classfiles to run. Many times, these classfiles may simply call a specified set of other Junit classifies. This way, the developer can specify what tests to run and what tests to skip.
You can control what tests to run or not run by using properties and not by creating dozens of testing tasks. This allows you to specify sets of tests without having to spawn multiple JUnit processes.
We have some projects in cruise control, set up roughly like this:
Cruise Control
<ant antfile="build.xml" dir="A" target="compile" inheritAll="false" />
in A the compile target calls, as a part of its compile, a jar target in B
(in "compile")
<ant antfile="${B.dir}/build.xml" inheritAll="false" target="jar" />
<javac ... >
So B has a jar task.A builds the jar from B and then uses it in it's compile.
The problem I'm running into is that cruise control seems to confuse the paths. Although the A compile task works directly from ant, when run from cruisecontrol it seems to be trying to find it's own internal libraries based on paths from the B jar settings.
To get this to work in ant I had to call B from A using the inheritAll="false" flag, but neither this nor calling javac with fork seems to resolve the problem.
Possibly related- we're running ant # version 1.7, the cc server is at ant version 1.6.5, which I can't easily update.
Any hints?
In your CruiseControl configuration you can specify the anthome or antscript attributes so that you use your version of Ant, so you should be able to get the same behavior from CC that you get at the command-line.
I want to use the FTP task in ant, and I have found the appropriate jar files and got everything working fine. I have put the jar files in a "libs" directory alongside the other files used in the build. The only problem is that the user must run "ant -lib commons-net-ftp-2.0.jar" to make a build; I would really prefer that it were possible to just run "ant" with no arguments.
Reading the ant optional tasks intallation page, I see that there are five ways one can load up extra libraries in ant, and none of them are really what I'm looking for. I do not want to force the user to make any modifications to their system to run this task; it should be possible to just load it from the "libs" directory inside of our product's source folder. So that means setting the global CLASSPATH is also out (which is a bad idea anyways).
The last option, as noted in the documentation, is the preferred approach... loading the jarfiles individually from the build script itself. I have done this in the past with the ant-contrib tasks and JUnit, and would like to do that here, but I don't see how I can accomplish this. The FTP task doesn't support a nested classpath element, and I don't know the XML resource I would need to load this library via a taskdef. How can I load the libraries from within ant?
Edit: In response to the answers and questions which have been posted here so far, I'm using ant 1.7.1. Making an ftp taskdef definitely does not work; that throws the following error:
BUILD FAILED
/my/path/build.xml:13: taskdef class org.apache.tools.ant.taskdefs.optional.net.FTP cannot be found
Perhaps this is because the classname is wrong. How exactly do I find the classname I'm supposed to use if I only have a jarfile? It's not documented anywhere, and I couldn't find anything in the jar itself resembling that path.
The problem you are having is due to the different class-loaders in use. The Commons Net classes must be loaded by the same class-loader that loads the FTP task. Because the FTP task is loaded by Ant on start-up, you need to add the Commons Net to Ant's classpath so that it is loaded by the same class-loader. That's why the documentation gives you 4 different ways to do this.
I agree that none of them are ideal (the CLASSPATH environment variable being the worst). One way around this is to supply a shell script with your project that invokes Ant and passes the apporpriate -lib argument. You then get people to use this rather than invoking Ant directly. In fact, you could deviously name it 'ant' so that it gets run instead of the existing 'ant' on the path (this only works if the current directory is on the path, ahead of other directories).
The fifth option in the documentation is great in theory. They finally fixed the class-loading problems in 1.7.0. Unfortunately, as you mention, nobody retro-fitted the FTP task to take a classpath. You could try submitting an enhancement request, but this won't help in the short term.
There is one other option, which isn't any better than the others. Instead of making sure that the Commons Net classes are loaded by the class-loader that loads the FTP task, you could make sure that the FTP task is loaded by the class-loader that loads the Commons Net classes. To do this you have to remove the ant-commons-lib.jar file from the 'lib' directory of the Ant installation. This means that the FTP task won't get loaded on start-up. This is actually why the optional tasks are broken up into so many separate JARs - so that they can be individually removed. Put this JAR file alongside the Commons Net JAR file so that it can be loaded at the same time. Then you can do something like this (I tried this and it works):
<taskdef name="ftp"
classname="org.apache.tools.ant.taskdefs.optional.net.FTP">
<classpath>
<pathelement location="${basedir}/lib/ant-commons-net.jar"/>
<pathelement location="${basedir}/lib/commons-net-2.0.jar"/>
</classpath>
</taskdef>
<ftp server="yourserver.com"
userid="anonymous"
password="blah">
<fileset dir="somedirectory"/>
</ftp>
But this is probably a worse option than just using the -lib switch (with or without a wrapper script). The only other thing I can think of is to try to find a third-party FTP task to use instead of the default one.
I have a solution:
you can download a new "classloader" task from http://enitsys.sourceforge.net/ant-classloadertask/ and load it whith:
<taskdef resource="net/jtools/classloadertask/antlib.xml"
classpath="XXX/ant-classloadertask.jar"/>
Naw can do things like loading classes with the same classloader that ant use for his task:
<classloader loader="system" classpath="XXX/commons-net-2.0.jar"/>
or "loader="project""
Then you definde your task:
<taskdef name="ftp" classname="org.apache.tools.ant.taskdefs.optional.net.FTP"/>
and go :-)
So I succeeded in doing this for the ant-salesforce.jar that you get when trying to do salesforce work (fun...)
Check to see if the jar has an xml file in it that looks something like this:
<antlib>
<typedef name="compileAndTest" classname="com.salesforce.ant.CompileAndTest"/>
....
</antlib>
Then in ant give it a taskdev that reads that file from inside the given jar, like this:
<taskdef resource="com/salesforce/antlib.xml" classpath="lib/ant-salesforce.jar" />
Hope that helps some.
Ah, man, this is just so nasty. I run ant from eclipse. I don't want to reconfigure ant in eclipse for new workspaces, so here's what I decided to do, to decouple running the task and configuring ant. I extracted the ftp task to a separate build file. Next I added a native call to the command line to start a completely new ant process with the required libraries on the path:
<target name="deploy-ftp">
<exec command="ant">
<arg line="-buildfile ftp.xml deploy-ftp -lib lib/ant"/>
</exec>
</target>
Now the master build file can be run without any special arguments and no modifications are required to the ant installation. It's nasty though, since the ftp task runs in a completely clean environment. None of the properties and paths from the master build file are available. Luckily I had all of these in a separate property file anyway, so I only needed a single import.
I would like to add a big thanks to Dan Dyer. Without your extensive explanation of what's going on behind the scenes, I wouldn't have found this solution.
Will this work assuming libs is directly under you project's base directory
<taskdef name="ftp" classname="org.apache.tools.ant.taskdefs.optional.net.FTP">
<classpath>
<pathelement location="${basedir}\libs\commons-net-1.4.0.jar"/>
</classpath>
</taskdef>
Your users all have ant installed on their machines but you can't / don't want to make them add the FTP jar? Can you bundle ant with your project make tasks that call YOUR ant bundle, with the jars placed so it'll work as follows?
<taskdef name="ftp" classname="org.apache.tools.ant.taskdefs.optional.net.FTP">
<classpath>
<pathelement location="\lib\commons-net-1.4.0.jar"/>
</classpath>
</taskdef>
<target name="testFtp">
<ftp server="blah" userid="foo" password="bar">
<fileset file="test.file" />
</ftp>
</target>