I'm working on a large Maven project consisting of a number of different modules. The Maven build intermittently fails on certain modules but if all is well, a simple manually invoked --resume-from
(sometimes on a couple of different modules) will allow it to continue to success.
Am deliberately omitting the details of exactly why this happens - suspect it may be due to Windows file locking on files in the target folder - but that's not the point of the question.
Question: Is it possible to get Maven to automatically retry (maybe just once, or maybe up to 3 times), resuming from the failed module?
Thoughts: The only way I can currently think of doing it is via a batch file, which reads the last line and somehow extracts the module name to resume from - but that doesn't look easy. Don't want to reinvent the wheel and was wondering if there's a nice Maven plugin that already does the job?
Below is a fully fledged batch file, using Anitha.R's answer as a starting point.
Usage instructions:
- Ensure the Maven executable is in the Windows path.
- Ideally also ensure that a version of tee for Windows is in the Windows path. (E.g. I'm use the one provided as part of Git for Windows, having added Git's
usr\bin
folder to my path). - Copy the batch file code into a new file.
- Change the
max_retries
value as desired. - Save as "mvnretry.bat" in a folder in the Windows path.
- Run in the same way as Maven, e.g.
mvnretry clean install -Pmyprofile -DskipTests
.
Batch file code:
@echo off
setlocal enabledelayedexpansion
set max_retries=3
set retry_count=0
set output_file=%date:/=%%time::=%
set output_file=%output_file: =0%
set output_file=%temp%\mvn%output_file:.=%.out
set mvn_command=call mvn %*
set tee_found=true
where /q tee
if not errorlevel 1 goto retry
set tee_found=false
echo tee.exe not found in system path^^! Build will continue but output will be delayed...
:retry
echo %mvn_command%
if %tee_found%==true (
%mvn_command% | tee %output_file%
) else (
%mvn_command% > %output_file%
type %output_file%
)
echo Parsing output...
set "resume_from="
for /f "tokens=2 delims=:" %%i in ('type %output_file% ^| find "mvn <goals> -rf"') do (
set resume_from=%%i
)
if !retry_count! LSS %max_retries% if not [%resume_from%] == [] (
echo Resuming from %resume_from%...
set /a retry_count=retry_count+1
set /a retries_remaining=max_retries-retry_count
echo Retrying... [retries used: !retry_count!, retries remaining: !retries_remaining!]
set mvn_command=call mvn -rf :%resume_from% %*
goto retry
)
del /q %output_file%
endlocal