[gh-11363] Java parser outputs single line with quoted arguments

Instead of outputting one argument per line (which still causes pipe
interpretation issues in batch for loops), output a single line with
each argument already quoted. This is much simpler and avoids all
batch script parsing issues.

Quotes in arguments are escaped by doubling them (batch convention).

Author: gnodet

apache-maven/src/assembly/maven/bin/JvmConfigParser.java

@@ -30,7 +30,7 @@
  *
  * Usage: java JvmConfigParser.java <jvm.config-path> <maven-project-basedir>
  *
- * Outputs: One argument per line (for safe batch script processing)
+ * Outputs: Single line with space-separated quoted arguments (safe for batch scripts)
  */
 public class JvmConfigParser {
     public static void main(String[] args) {
@@ -48,6 +48,8 @@ public static void main(String[] args) {
         }
 
         try (Stream<String> lines = Files.lines(jvmConfigPath, StandardCharsets.UTF_8)) {
+            StringBuilder result = new StringBuilder();
+
             lines.forEach(line -> {
                 // Remove comments
                 int commentIndex = line.indexOf('#');
@@ -67,9 +69,18 @@ public static void main(String[] args) {
                 line = line.replace("${MAVEN_PROJECTBASEDIR}", mavenProjectBasedir);
                 line = line.replace("$MAVEN_PROJECTBASEDIR", mavenProjectBasedir);
 
-                // Output each line separately (one argument per line)
-                System.out.println(line);
+                // Quote the argument to protect special characters
+                // Escape any existing quotes by doubling them
+                line = line.replace("\"", "\"\"");
+
+                // Append quoted argument with space separator
+                if (result.length() > 0) {
+                    result.append(' ');
+                }
+                result.append('"').append(line).append('"');
             });
+
+            System.out.print(result.toString());
         } catch (IOException e) {
             System.err.println("Error reading jvm.config: " + e.getMessage());
             System.exit(1);

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

@@ -185,16 +185,11 @@ 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 (one argument per line)
+rem Run the parser and save output to temp file (single line with quoted arguments)
 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
-rem Read each line and append to JVM_CONFIG_MAVEN_OPTS with proper quoting
-@setlocal EnableDelayedExpansion
-set "JVM_CONFIG_MAVEN_OPTS="
-for /f "usebackq delims=" %%a in ("%JVM_CONFIG_TEMP%") do (
-    set "JVM_CONFIG_MAVEN_OPTS=!JVM_CONFIG_MAVEN_OPTS! "%%a""
-)
-@endlocal & set "JVM_CONFIG_MAVEN_OPTS=%JVM_CONFIG_MAVEN_OPTS%"
+rem Read the single line from temp file
+set /p JVM_CONFIG_MAVEN_OPTS=<"%JVM_CONFIG_TEMP%"
 del "%JVM_CONFIG_TEMP%" 2>nul
 
 :endReadJvmConfig