XWIKI-10646: Make the standalone debug script start in Windows even if...

XWIKI-10646: Make the standalone debug script start in Windows even if JAVA_HOME is not defined and Java is not on the PATH
Done.

xwiki-platform-tools/xwiki-platform-tool-jetty/xwiki-platform-tool-jetty-resources/src/main/resources/start_xwiki_debug.bat

@@ -61,6 +61,11 @@ if "%2"=="profiler" (
   set JAVA_TOOL_OPTIONS=-agentlib:yjpagent
 )
 
+REM Get javaw.exe from the latest properly installed JRE
+for /f tokens^=2^ delims^=^" %%i in ('reg query HKEY_CLASSES_ROOT\jarfile\shell\open\command /ve') do set JAVAW_PATH=%%i
+set JAVA_PATH=%JAVAW_PATH:\javaw.exe=%\java.exe
+if "%JAVA_PATH%"=="" set JAVA_PATH=java
+
 REM Location where XWiki stores generated data and where database files are.
 set XWIKI_DATA_DIR=${xwikiDataDir}
 set XWIKI_OPTS=%XWIKI_OPTS% -Dxwiki.data.dir=%XWIKI_DATA_DIR%
@@ -91,7 +96,7 @@ REM Note that setting this value too high can leave your server vulnerable to de
 REM service attacks.
 set XWIKI_OPTS=%XWIKI_OPTS% -Dorg.eclipse.jetty.server.Request.maxFormContentSize=1000000
 
-java %XWIKI_OPTS% %4 %5 %6 %7 %8 %9 -jar %JETTY_HOME%/start.jar
+"%JAVA_PATH%" %XWIKI_OPTS% %4 %5 %6 %7 %8 %9 -jar %JETTY_HOME%/start.jar
 
 if %2==profiler set PATH=%OLD_PATH%