Re: javac task question

I think I understand now.

The documentation for javac says that javac expects source files to live =
in a package tree, but that does not apply to the
source files on the command line.

> On Dec 21, 2023, at 10:07=E2=80=AFAM, Alan Snyder =
<[email protected]> wrote:
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> Thank you for the suggestion. It seems to work.
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> I do not understand why my previous snippet worked. If java used =
srcdir=3D=E2=80=9C.=E2=80=9D as the root of a package tree,
> then why did it compile files in a and b as top level classes? (The =
files in a and b did not declare a package.)
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>  Alan
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>> On Dec 20, 2023, at 10:02=E2=80=AFPM, ilya Basin =
<[email protected]> wrote:
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>> Alan. I never used srcpath before and after some trial and error I =
feel that the source of the problem is bad description of the option in =
JDK.
>> Ant passes srcpath directly to JDK's javac (unlike srcdir which Ant =
itself searches for java files).
>>=20
>> The description says "Specify" or "Specifies", but it actually =
"overrides" the default. And the default is current dir ".".
>> The other important thing the short description doesn't mention is =
javac won't compile all source files in srcpath, but only those needed =
by explicitly listed source files.
>> So by default javac will look in the current dir for source files =
needed to compile explicitly listed source files.
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>> You probably want all sources in "a" and "b" to be compiled so you =
shouldn't use srcpath for them.
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>> Finally, javac does not accept fileset as <src> or srcdir. In your =
example "p" was consisting of java files and it was wasn't failing for =
you because it was used as srcpath and srcpath was never scanned by =
javac because all needed sources were found in srcdir.
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>> Ant docs could be better too. I wasn't able to find examples of <src =
refid=3D.../> on the site.
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>> Please try my variant:
>>=20
>>   <?xml version=3D"1.0" encoding=3D"UTF-8"?>
>>=20
>>   <project name=3D"test" default=3D"t" basedir=3D".">
>>=20
>>     <path id=3D"p">
>>       <path path=3D"a"/>
>>       <path path=3D"b"/>
>>     </path>
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>>     <target name=3D"t">
>>       <javac>
>>         <src refid=3D"p"/>
>>       </javac>
>>     </target>
>>=20
>>   </project>
>>=20
>>=20
>>=20
>>=20
>> -------- Original Message --------
>> From: Alan Snyder [mailto:[email protected]]
>> Sent: Wednesday, December 20, 2023 at 23:37 UTC
>> To: Ant Users List
>> Subject: javac task question
>>=20
>>=20
>> This actually does what I want:
>>=20
>> <?xml version=3D"1.0" encoding=3D"UTF-8"?>
>>=20
>> <project name=3D"test" default=3D"t" basedir=3D".">
>>=20
>> <path id=3D"p">
>>   <fileset dir=3D"a"/>
>>   <fileset dir=3D"b"/>
>> </path>
>>=20
>> <target name=3D"t">
>>   <javac srcdir=3D"." sourcepathref=3D"p"/>
>> </target>
>>=20
>> </project>
>>=20
>> The problem is that I don=E2=80=99t really want to specify srcdir, =
but if I leave it out, the build fails (see below).
>> I would need to create a fake directory to use as srcdir to be sure =
that I don=E2=80=99t accidentally compile unwanted sources.
>>=20
>>=20
>> Apache Ant(TM) version 1.10.14 compiled on August 16 2023
>> Trying the default build file: build.xml
>> Buildfile: /Users/alan/testAnt1/build.xml
>> Detected Java version: 21 in: =
/Library/Java/JavaVirtualMachines/jdk-21.0.1.jdk/Contents/Home
>> Detected OS: Mac OS X
>> parsing buildfile /Users/alan/testAnt1/build.xml with URI =3D =
file:/Users/alan/testAnt1/build.xml
>> Project base dir set to: /Users/alan/testAnt1
>> parsing buildfile =
jar:file:/Users/alan/.ant/lib/vbuilder-ant-uber-1.0-SNAPSHOT.jar!/org/apac=
he/tools/ant/antlib.xml with URI =3D =
jar:file:/Users/alan/.ant/lib/vbuilder-ant-uber-1.0-SNAPSHOT.jar!/org/apac=
he/tools/ant/antlib.xml from a zip file
>> parsing buildfile =
jar:file:/usr/local/ant/lib/ant.jar!/org/apache/tools/ant/antlib.xml =
with URI =3D =
jar:file:/usr/local/ant/lib/ant.jar!/org/apache/tools/ant/antlib.xml =
from a zip file
>> Build sequence for target(s) `t' is [t]
>> Complete build sequence is [t, ]
>>=20
>> t:
>>=20
>> BUILD FAILED
>> /Users/alan/testAnt1/build.xml:11: either srcdir or modulesourcepath =
attribute must be set!
>> 	at =
org.apache.tools.ant.taskdefs.Javac.checkParameters(Javac.java:1309)
>> 	at org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:1080)
>> 	at =
org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:299)
>> 	at =
java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMet=
hodHandleAccessor.java:103)
>> 	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
>> 	at =
org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:99)=

>> 	at org.apache.tools.ant.Task.perform(Task.java:350)
>> 	at org.apache.tools.ant.Target.execute(Target.java:449)
>> 	at org.apache.tools.ant.Target.performTasks(Target.java:470)
>> 	at =
org.apache.tools.ant.Project.executeSortedTargets(Project.java:1401)
>> 	at org.apache.tools.ant.Project.executeTarget(Project.java:1374)
>> 	at =
org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor=
.java:41)
>> 	at =
org.apache.tools.ant.Project.executeTargets(Project.java:1264)
>> 	at org.apache.tools.ant.Main.runBuild(Main.java:818)
>> 	at org.apache.tools.ant.Main.startAnt(Main.java:223)
>> 	at org.apache.tools.ant.launch.Launcher.run(Launcher.java:284)
>> 	at org.apache.tools.ant.launch.Launcher.main(Launcher.java:101)
>>=20
>> Total time: 0 seconds
>>=20
>>=20
>> On Dec 19, 2023, at 10:17=E2=80=AFPM, Jaikiran Pai =
<[email protected]> wrote:
>>=20
>> Hello Alan,
>>=20
>> It's hard to say what's going on. Do you have a build file (or a =
snippet) to show what issue you are running into?
>>=20
>> Which version of Java and Ant is this showing up on?
>>=20
>> -Jaikiran
>>=20
>> On 18/12/23 1:44 am, Alan Snyder wrote:
>> I know of a couple of ways to run javac on more than one source tree.
>>=20
>> One way is to use nested src elements.
>>=20
>> Another way is like this:
>>=20
>> srcdir=3D"${src}:${src2}=E2=80=9D
>>=20
>> I would like to generalize this solution to a dynamicly determined =
list of source trees.
>>=20
>> I thought that I could use srcpath for this purpose, but the task =
would fail if srcdir was not specified or it did not identify a valid =
directory.
>> That restriction defeats my purpose.
>>=20
>> Is there a solution?
>>=20
>> Is the inability to use srcpath by itself a bug?
>>=20
>> Thank you.
>>=20
>>=20
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>>=20
>>=20
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>>=20
>>=20
>>=20
>>=20
>>=20
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