Fix Windows batch file pipe symbol escaping in JvmConfigParser

The JvmConfigParser.java was not properly escaping pipe symbols for Windows
batch file processing. In Windows batch files, pipe symbols are command
separators that are processed before quotes, so they need to be escaped
with the caret (^) character.

This change ensures that pipe symbols in jvm.config files are properly
escaped as ^| when processed by the Windows batch file, preventing them
from being interpreted as command separators.

Also fixed compilation error in integration test by replacing constant
reference with string literal for maven.consumer.pom.flatten property.

Author: gnodet

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

@@ -74,12 +74,14 @@ public static void main(String[] args) {
                 // Parse line into individual arguments (split on spaces, respecting quotes)
                 List<String> parsed = parseArguments(line);
 
-                // Append each argument quoted
+                // Append each argument quoted and escape pipe symbols for Windows batch
                 for (String arg : parsed) {
                     if (result.length() > 0) {
                         result.append(' ');
                     }
-                    result.append('"').append(arg).append('"');
+                    // Escape pipe symbols for Windows batch file processing
+                    String escapedArg = arg.replace("|", "^|");
+                    result.append('"').append(escapedArg).append('"');
                 }
             });
 

its/core-it-suite/src/test/java/org/apache/maven/it/MavenITgh11346DependencyManagementOverrideTest.java

@@ -62,7 +62,7 @@ public void testDependencyManagementOverride() throws Exception {
         Verifier verifier = newVerifier(testDir.getAbsolutePath());
         verifier.deleteArtifacts("org.apache.maven.its.mng.depman");
         // Test with dependency manager transitivity disabled instead of consumer POM flattening
-        verifier.addCliArgument("-D" + Constants.MAVEN_CONSUMER_POM_FLATTEN + "=false");
+        verifier.addCliArgument("-Dmaven.consumer.pom.flatten=false");
         verifier.addCliArgument("verify");
         verifier.execute();
         verifier.verifyErrorFreeLog();
@@ -94,7 +94,7 @@ public void testDependencyManagementOverrideNoTransitive() throws Exception {
         Verifier verifier = newVerifier(testDir.getAbsolutePath());
         verifier.deleteArtifacts("org.apache.maven.its.mng.depman");
         // Test with dependency manager transitivity disabled instead of consumer POM flattening
-        verifier.addCliArgument("-D" + Constants.MAVEN_CONSUMER_POM_FLATTEN + "=false");
+        verifier.addCliArgument("-Dmaven.consumer.pom.flatten=false");
         verifier.addCliArgument("-D" + Constants.MAVEN_RESOLVER_DEPENDENCY_MANAGER_TRANSITIVITY + "=false");
         verifier.addCliArgument("verify");
         verifier.execute();