--- /dev/null	2019-12-03 13:39:10.000000000 -0500
+++ new/src/jdk.incubator.jpackage/share/classes/jdk/incubator/jpackage/internal/ToolValidator.java	2019-12-03 13:39:08.489932500 -0500
@@ -0,0 +1,136 @@
+/*
+ * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package jdk.incubator.jpackage.internal;
+
+import java.io.IOException;
+import java.nio.file.Path;
+import java.text.MessageFormat;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.function.BiFunction;
+import java.util.function.Function;
+import java.util.stream.Stream;
+
+
+public final class ToolValidator {
+
+    ToolValidator(String tool) {
+        this(Path.of(tool));
+    }
+
+    ToolValidator(Path toolPath) {
+        this.toolPath = toolPath;
+        args = new ArrayList<>();
+
+        if (Platform.getPlatform() == Platform.LINUX) {
+            setCommandLine("--version");
+        }
+
+        setToolNotFoundErrorHandler(null);
+        setToolOldVersionErrorHandler(null);
+    }
+
+    ToolValidator setCommandLine(String... args) {
+        this.args = List.of(args);
+        return this;
+    }
+
+    ToolValidator setMinimalVersion(Comparable<String> v) {
+        minimalVersion = v;
+        return this;
+    }
+
+    ToolValidator setVersionParser(Function<Stream<String>, String> v) {
+        versionParser = v;
+        return this;
+    }
+
+    ToolValidator setToolNotFoundErrorHandler(
+            BiFunction<String, IOException, ConfigException> v) {
+        toolNotFoundErrorHandler = v;
+        return this;
+    }
+
+    ToolValidator setToolOldVersionErrorHandler(BiFunction<String, String, ConfigException> v) {
+        toolOldVersionErrorHandler = v;
+        return this;
+    }
+
+    ConfigException validate() {
+        List<String> cmdline = new ArrayList<>();
+        cmdline.add(toolPath.toString());
+        cmdline.addAll(args);
+
+        String name = toolPath.getFileName().toString();
+        try {
+            ProcessBuilder pb = new ProcessBuilder(cmdline);
+            AtomicBoolean canUseTool = new AtomicBoolean();
+            if (minimalVersion == null) {
+                // No version check.
+                canUseTool.setPlain(true);
+            }
+
+            String[] version = new String[1];
+            Executor.of(pb).setOutputConsumer(lines -> {
+                if (versionParser != null && minimalVersion != null) {
+                    version[0] = versionParser.apply(lines);
+                    if (minimalVersion.compareTo(version[0]) < 0) {
+                        canUseTool.setPlain(true);
+                    }
+                }
+            }).execute();
+
+            if (!canUseTool.getPlain()) {
+                if (toolOldVersionErrorHandler != null) {
+                    return toolOldVersionErrorHandler.apply(name, version[0]);
+                }
+                return new ConfigException(MessageFormat.format(I18N.getString(
+                        "error.tool-old-version"), name, minimalVersion),
+                        MessageFormat.format(I18N.getString(
+                                "error.tool-old-version.advice"), name,
+                                minimalVersion));
+            }
+        } catch (IOException e) {
+            if (toolNotFoundErrorHandler != null) {
+                return toolNotFoundErrorHandler.apply(name, e);
+            }
+            return new ConfigException(MessageFormat.format(I18N.getString(
+                    "error.tool-not-found"), name, e.getMessage()),
+                    MessageFormat.format(I18N.getString(
+                            "error.tool-not-found.advice"), name), e);
+        }
+
+        // All good. Tool can be used.
+        return null;
+    }
+
+    private final Path toolPath;
+    private List<String> args;
+    private Comparable<String> minimalVersion;
+    private Function<Stream<String>, String> versionParser;
+    private BiFunction<String, IOException, ConfigException> toolNotFoundErrorHandler;
+    private BiFunction<String, String, ConfigException> toolOldVersionErrorHandler;
+}