Detect Windows JVMs

The JDK detection mechanism doesn't find much on Windows. Have it find
the default installation directories of Adoptium and RedHat. Further
providers can easily be added without changing the code logic.

Also let duplicate VM names start with index 2, not 1. And finally
improve the job name.

org.eclipse.jdt.launching/launching/org/eclipse/jdt/internal/launching/DetectVMInstallationsJob.java

@@ -17,6 +17,7 @@
 import java.util.Collection;
 import java.util.Collections;
 import java.util.HashSet;
+import java.util.List;
 import java.util.Objects;
 import java.util.Set;
 import java.util.stream.Collectors;
@@ -82,7 +83,7 @@ public IStatus run(IProgressMonitor monitor) {
 			VMStandin workingCopy = new VMStandin(standardType, f.getAbsolutePath());
 			workingCopy.setInstallLocation(f);
 			String name = f.getName();
-			int i = 1;
+			int i = 2;
 			while (isDuplicateName(name)) {
 				name = f.getName() + '(' + i++ + ')';
 			}
@@ -103,7 +104,7 @@ public IStatus run(IProgressMonitor monitor) {
 			}
 			SubMonitor subMon = SubMonitor.convert(monitor, systemVM.getInstallLocation().getAbsolutePath(), 1);
 			String name = systemVM.getName();
-			int i = 1;
+			int i = 2;
 			while (isDuplicateName(name)) {
 				name = systemVM.getName() + '(' + i++ + ')';
 			}
@@ -129,7 +130,9 @@ private boolean isDuplicateName(String name) {
 	private Collection<File> computeCandidateVMs(StandardVMType standardType) {
 		// parent directories containing a collection of VM installations
 		Collection<File> rootDirectories = new HashSet<>();
-		if (!Platform.OS_WIN32.equals(Platform.getOS())) {
+		if (Platform.OS_WIN32.equals(Platform.getOS())) {
+			computeWindowsCandidates(rootDirectories);
+		} else {
 			rootDirectories.add(new File("/usr/lib/jvm")); //$NON-NLS-1$
 		}
 		rootDirectories.add(new File(System.getProperty("user.home"), ".sdkman/candidates/java")); //$NON-NLS-1$ //$NON-NLS-2$
@@ -165,6 +168,18 @@ private Collection<File> computeCandidateVMs(StandardVMType standardType) {
 			.collect(Collectors.toCollection(HashSet::new));
 	}
 
+	private void computeWindowsCandidates(Collection<File> rootDirectories) {
+		List<String> progFiles = List.of("ProgramFiles", "ProgramFiles(x86)"); //$NON-NLS-1$//$NON-NLS-2$
+		List<String> subDirs = List.of("Eclipse Adoptium", "RedHat");  //$NON-NLS-1$//$NON-NLS-2$
+		rootDirectories.addAll(
+		progFiles.stream()
+			.map(name -> System.getenv(name))
+			.filter(Objects::nonNull)
+			.distinct()
+			.flatMap(progFilesDir -> subDirs.stream().map(subDir -> new File(progFilesDir, subDir)))
+			.collect(Collectors.toList()));
+	}
+
 	private static Set<File> knownVMs() {
 		return Stream.of(JavaRuntime.getVMInstallTypes())
 			.map(IVMInstallType::getVMInstalls)

org.eclipse.jdt.launching/launching/org/eclipse/jdt/internal/launching/LaunchingMessages.properties

@@ -207,5 +207,5 @@ RunnerBootpathPError=Xbootclasspath/p option have been removed as not supported
 VMLogging_1=Restoring vm library location:
 VMLogging_2=Creating Library with Java Install path:
 VMLogging_3=Default Install retrieved:
-lookupInstalledJVMs=Look up for installed JVMs
+lookupInstalledJVMs=Detect installed JVMs
 configuringJVM=Configuring installed JVM {0}