[gh-11363] Use Java single-file source execution instead of compiling

Use 'java SourceFile.java' (Java 11+) to run the parser directly
without compilation. This avoids needing write access to the bin
directory and simplifies the script.

Author: gnodet

apache-maven/src/assembly/maven/bin/mvn.cmd

@@ -181,13 +181,9 @@ if not exist "%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config" goto endReadJvmConfig
 
 rem Use Java to parse jvm.config to avoid batch script parsing issues with special characters
 rem This handles pipes, quotes, and other special characters correctly
-rem Compile the parser if not already compiled
-if not exist "%MAVEN_HOME%\bin\JvmConfigParser.class" (
-    "%JAVACMD:java.exe=javac.exe%" -d "%MAVEN_HOME%\bin" "%MAVEN_HOME%\bin\JvmConfigParser.java" >nul 2>&1
-)
-rem Run the parser and save output to temp file (single line with quoted arguments)
+rem Use single-file source-code execution (Java 11+) to avoid needing write access to bin directory
 set "JVM_CONFIG_TEMP=%TEMP%\mvn-jvm-config-%RANDOM%.txt"
-"%JAVACMD%" -cp "%MAVEN_HOME%\bin" JvmConfigParser "%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config" "%MAVEN_PROJECTBASEDIR%" > "%JVM_CONFIG_TEMP%" 2>nul
+"%JAVACMD%" "%MAVEN_HOME%\bin\JvmConfigParser.java" "%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config" "%MAVEN_PROJECTBASEDIR%" > "%JVM_CONFIG_TEMP%" 2>nul
 rem Read the single line from temp file
 set /p JVM_CONFIG_MAVEN_OPTS=<"%JVM_CONFIG_TEMP%"
 del "%JVM_CONFIG_TEMP%" 2>nul