July, 2018 | SiZiOUS :: Serial Koder

If you are a Java developer you certainly know Apache Maven, which is (more or less) a Make equivalent for the Java world.

Some days ago I needed to automatically extract some values from the pom.xml file to automatize some operations. For example, I wanted to extract the values of the groupId, artifactId and version nodes from a Maven project, i.e. from the pom.xml file.

I finally created a pure Windows batch solution in order to do that, I called this little utility: POM Tool.

Here is the source code of it:

@echo off
setlocal EnableDelayedExpansion
set POM_TOOL_VERSION=20180914

rem Parameters
set MAVEN_POM_INPUT_TAG=%1
set MAVEN_POM_FILE=pom.xml
if "%2" neq "" set MAVEN_POM_FILE=%2

rem Check input parameters
if "%MAVEN_POM_INPUT_TAG%"=="" goto help
if "%MAVEN_POM_FILE%"=="" goto error_pom_not_found
if not exist %MAVEN_POM_FILE% goto error_pom_not_found

rem Compute start/end positions to extract the value from the XML tag
call:strlen %MAVEN_POM_INPUT_TAG%
set /a TAG_BEGIN=%_strlen% + 2
set /a TAG_END=(%TAG_BEGIN% + 1) * -1

rem Perform the XML tag value extraction
call:extractxml %MAVEN_POM_INPUT_TAG% %TAG_BEGIN% %TAG_END%
if "%_extractxml%"=="" goto error_extraction_failed
echo %_extractxml%
goto:eof

::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

rem ---
rem Display help message
rem ---
:help
call:banner
echo Usage: %~n0 ^&lt;xml_tag^&gt; [pom_file]
echo.
echo Example: %~n0 version - will return artifact version
echo          %~n0 groupId - will return artifact groupId
goto:eof

rem ---
rem Error: The requested tag was not found
rem ---
:error_extraction_failed
call:banner
echo Error: The tag "%MAVEN_POM_INPUT_TAG%" wasn't found in the "%MAVEN_POM_FILE%" file.
goto:eof

rem ---
rem Error: The Maven POM file wasn't found
rem ---
:error_pom_not_found
call:banner
echo Error: The "%MAVEN_POM_FILE%" file wasn't found.
goto:eof

rem ---
rem Function: banner
rem Used to display the tool banner
rem ---
:banner
echo POM Tool - Ver. %POM_TOOL_VERSION%
echo.
goto:eof

rem ---
rem Function: extractxml 
rem Used to parse %MAVEN_POM_FILE% for extracting tags value.
rem Usage: call:extractxml %param% where %param% is the tag to search.
rem ---
:extractxml
setlocal
set _extracted_xml_result=
set _token=^&lt;%~1^&gt;
set _begin=%~2
set _end=%~3
for /f "tokens=*" %%a in (%MAVEN_POM_FILE%) do (
	set row=%%a
	if /i "!row:%_token%=!"=="!row!" (echo NOP &gt; nul) else (
		set _extracted_xml_result=!row!
		if /i "!_extracted_xml_result!" neq "" goto extractxml_endloop
	)
)
:extractxml_endloop
set "_final=%_extracted_xml_result%"
if "%_final%" neq "" call set _final=%%_final:~%_begin%,%_end%%%
(endlocal
	if "%~1" neq "" set "_extractxml=%_final%"
)
goto:eof

rem ---
rem Function: strlen
rem Get the length of a string
rem Thanks to: SS64 (https://ss64.com/nt/syntax-strlen.html)
rem ---
:strlen
setlocal
set _str=%~1

rem Remove any quotes
set _str=%_str:"=%

rem Test if empty
if not defined _str echo endlocal &amp; set _strlen=0&amp;goto:eof

set MAX_STRING_LENGTH=256
for /l %%g in (0,1,!MAX_STRING_LENGTH!) do (
	REM extract one character
	set "_char=!_str:~%%g,1!"
	REM if _char is empty we are at the end of the string
	if not defined _char endlocal &amp; set _strlen=%%g&amp; goto:eof
)
goto:eof

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@echo off

setlocal EnableDelayedExpansion

set POM_TOOL_VERSION=20180914

rem Parameters

set MAVEN_POM_INPUT_TAG=%1

set MAVEN_POM_FILE=pom.xml

if "%2" neq "" set MAVEN_POM_FILE=%2

rem Check input parameters

if "%MAVEN_POM_INPUT_TAG%"=="" goto help

if "%MAVEN_POM_FILE%"=="" goto error_pom_not_found

if not exist %MAVEN_POM_FILE% goto error_pom_not_found

rem Compute start/end positions to extract the value from the XML tag

call:strlen %MAVEN_POM_INPUT_TAG%

set /a TAG_BEGIN=%_strlen% + 2

set /a TAG_END=(%TAG_BEGIN% + 1) * -1

rem Perform the XML tag value extraction

call:extractxml %MAVEN_POM_INPUT_TAG% %TAG_BEGIN% %TAG_END%

if "%_extractxml%"=="" goto error_extraction_failed

echo %_extractxml%

goto:eof

::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

rem ---

rem Display help message

rem ---

:help

call:banner

echo Usage: %~n0 ^<xml_tag^> [pom_file]

echo.

echo Example: %~n0 version - will return artifact version

echo %~n0 groupId - will return artifact groupId

goto:eof

rem ---

rem Error: The requested tag was not found

rem ---

:error_extraction_failed

call:banner

echo Error: The tag "%MAVEN_POM_INPUT_TAG%" wasn't found in the "%MAVEN_POM_FILE%" file.

goto:eof

rem ---

rem Error: The Maven POM file wasn't found

rem ---

:error_pom_not_found

call:banner

echo Error: The "%MAVEN_POM_FILE%" file wasn't found.

goto:eof

rem ---

rem Function: banner

rem Used to display the tool banner

rem ---

:banner

echo POM Tool - Ver. %POM_TOOL_VERSION%

echo.

goto:eof

rem ---

rem Function: extractxml

rem Used to parse %MAVEN_POM_FILE% for extracting tags value.

rem Usage: call:extractxml %param% where %param% is the tag to search.

rem ---

:extractxml

setlocal

set _extracted_xml_result=

set _token=^<%~1^>

set _begin=%~2

set _end=%~3

for /f "tokens=*" %%a in (%MAVEN_POM_FILE%) do (

set row=%%a

if /i "!row:%_token%=!"=="!row!" (echo NOP > nul) else (

set _extracted_xml_result=!row!

if /i "!_extracted_xml_result!" neq "" goto extractxml_endloop

)

:extractxml_endloop

set "_final=%_extracted_xml_result%"

if "%_final%" neq "" call set _final=%%_final:~%_begin%,%_end%%%

(endlocal

if "%~1" neq "" set "_extractxml=%_final%"

)

goto:eof

rem ---

rem Function: strlen

rem Get the length of a string

rem Thanks to: SS64 (https://ss64.com/nt/syntax-strlen.html)

rem ---

:strlen

setlocal

set _str=%~1

rem Remove any quotes

set _str=%_str:"=%

rem Test if empty

if not defined _str echo endlocal & set _strlen=0&goto:eof

set MAX_STRING_LENGTH=256

for /l %%g in (0,1,!MAX_STRING_LENGTH!) do (

REM extract one character

set "_char=!_str:~%%g,1!"

REM if _char is empty we are at the end of the string

if not defined _char endlocal & set _strlen=%%g& goto:eof

)

goto:eof

Just copy-paste that source code into a new file and call the file pomtool.cmd.

The usage is pretty simple:

pomtool artifactId c:\temp\my-maven-project\pom.xml

1	pomtool artifactId c:\temp\my-maven-project\pom.xml

This will give you the value of the artifactId node for the c:\temp\my-maven-project\pom.xml file!

Of course you can include a call to the POM Tool in another batch file, for example:

@echo off
for /f "tokens=*" %%i in ('pomtool description c:\my\project\pom.xml') do set "PROJECT_NAME=%%i"
echo %PROJECT_NAME%
pause

@echo off

for /f "tokens=*" %%i in ('pomtool description c:\my\project\pom.xml') do set "PROJECT_NAME=%%i"

echo %PROJECT_NAME%

pause

In that way, the %PROJECT_NAME% variable in your batch will have the output of the POM Tool utility, in that example the content of the description node! 🙂

Don’t hesitate to comments if you have any question! 🙂

If the Sega Dreamcast world is familiar to you, you most certainly know the CDI image format. CDI images are mostly bootable images for the Dreamcast: simply burn the CDI disc image and then put that burned CD-R inside the Dreamcast to see the game booting.

CDI images are generated with a tool named Padus DiscJuggler. The latest version (development is halted) is the 6.00.1400 version released back in 2007. Today, I wanted to install this tool on my Microsoft Windows 10 Pro x64 Update 1803 computer, but unfortunately it doesn’t work, this message always appears:

You need to reboot your system.

That’s obviously what I did. I restarted 3 times but nothing to do: this message is still displayed and the software does not install.

After disassembling the executable, the problem is simple. It’s caused by the presence of some values in the Windows Registry under the RunOnce key. Since DiscJuggler is a 32-bit program, you have to check if there are values in these locations:

HKEY_CURRENT_USER\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\
HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\

1 2	HKEY_CURRENT_USER\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\ HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\

So actually in my case I had many values in the keys above:

A value is present in the RunOnce key

In theory, it’s enough to restart the computer so that the RunOnce keys are cleared automatically of their values. Programs in these keys are in theory executed only once then these corresponding values are automatically deleted (in this screenshot, the only value that exists is called PreRun).

But in my case, nothing works, the RunOnce key always contains something: this famous PreRun program from Gigabyte! This is because I actually have a Gigabyte motherboard and I’ve installed some tools that came with my motherboard. Even by deleting this value by hand (do not forget to run regedit in Administrator mode), it’s always re-created automatically (just hit F5 to see it reappearing after a few seconds …). So the installation of DiscJuggler always displays that You need to reboot your system. message…

In my case, the solution is simple. I’ve just stopped the GIGABYTE Adjust service so the PreRun value isn’t recreated, just enough time to install DiscJuggler.

Stopping the GIGABYTE Adjust service

After doing this, the installation can begins:

Installing Padus DiscJuggler 6.00.1400 under Windows 10

And best of all, the program works very well under Windows 10! 🙂

Monthly Archives: July 2018

Apache Maven: How to extract XML node values from the pom.xml (in pure batch!)

Installing DiscJuggler on Windows 10