FYI ant outputs System.out at "INFO" level and System.err at "WARN" level. This can be shown as follows: redirect.xml:
<project xmlns:ac="antlib:net.sf.antcontrib">
<ac:shellscript shell="python">
import sys
sys.stdout.write("stdout\n")
sys.stderr.write("stderr\n")
</ac:shellscript>
</project>ant -f redirect.xml -logger org.apache.tools.ant.XmlLogger
<?xml version="1.0" encoding="UTF-8" ?> <?xml-stylesheet type="text/xsl" href="log.xsl"?>
<build time="0 seconds"> <task location="jar:file:/home/preilly/corvil/MED/ant/lib/ant-contrib.jar!/net/sf/antcontrib/antlib.xml:1: " name="" time="0 seconds"></task> <task location="/home/preilly/learning/ant/redirect.xml:2: " name="ac:shellscript" time="0 seconds"> <message priority="info"><![CDATA[stdout]]></message> <message priority="warn"><![CDATA[stderr]]></message> <message priority="warn"><![CDATA[]]></message> <message priority="info"><![CDATA[]]></message> </task> </build>
However to support error line/file detection you need to use an ide - emacs, jedit can parse the output for javac generated errors when ant is called with the -emacs flag. netbeans (at least in version 3.6) can process the errors without the -emacs flag.
All of these use a regex matching of the output stream to detect the errors (and file/linenumber).
Peter
Digambar, Shaligram (Consultant) wrote:
Had ANT logged system.err at different level than system.out it would have been easier to redirect the error output to a separate file and generate better build reports. If its tricky as you've mentioned, we need to find a workaround. Has anyone already done this?
Thanks, Shaligram
As I mentioned before, the default compilers are
called within the VM and do not provide a
comprehensive call interface. Ant has no control over
their output; it wouldn't be logged at all if Ant
didn't override System.out and System.err to go to its
own log stream. It might be possible to re-override
System.err to log at ERROR level for the duration of
<javac>'s execute() method, but it could get tricky. Again, I think the answer here is to implement output
redirection for <javac> provided an externally called
compiler type is used, but it'll be awhile.
-Matt
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