GH-472 Add warning popup for mismatched Java versions

Closes #472

launcher/src/main/java/com/skcraft/launcher/launch/LaunchSupervisor.java

@@ -16,11 +16,14 @@ import com.skcraft.launcher.auth.Session;
 import com.skcraft.launcher.dialog.AccountSelectDialog;
 import com.skcraft.launcher.dialog.ProgressDialog;
 import com.skcraft.launcher.launch.LaunchOptions.UpdatePolicy;
+import com.skcraft.launcher.launch.runtime.JavaRuntime;
+import com.skcraft.launcher.model.minecraft.JavaVersion;
 import com.skcraft.launcher.persistence.Persistence;
 import com.skcraft.launcher.swing.SwingHelper;
 import com.skcraft.launcher.update.Updater;
 import com.skcraft.launcher.util.SharedLocale;
 import com.skcraft.launcher.util.SwingExecutor;
+import lombok.RequiredArgsConstructor;
 import lombok.extern.java.Log;
 import org.apache.commons.io.FileUtils;
 
@@ -29,6 +32,8 @@ import java.awt.*;
 import java.io.File;
 import java.io.IOException;
 import java.util.Date;
+import java.util.concurrent.ExecutionException;
+import java.util.function.BiPredicate;
 import java.util.logging.Level;
 
 import static com.google.common.util.concurrent.MoreExecutors.sameThreadExecutor;
@@ -119,7 +124,7 @@ public class LaunchSupervisor {
         final File extractDir = launcher.createExtractDir();
 
         // Get the process
-        Runner task = new Runner(launcher, instance, session, extractDir);
+        Runner task = new Runner(launcher, instance, session, extractDir, new RuntimeVerifier(instance));
         ObservableFuture<Process> processFuture = new ObservableFuture<Process>(
                 launcher.getExecutor().submit(task), task);
 
@@ -169,4 +174,38 @@ public class LaunchSupervisor {
             }
         }, sameThreadExecutor());
     }
+
+    @RequiredArgsConstructor
+    static class RuntimeVerifier implements BiPredicate<JavaRuntime, JavaVersion> {
+        private final Instance instance;
+
+        @Override
+        public boolean test(JavaRuntime javaRuntime, JavaVersion javaVersion) {
+            ListenableFuture<Boolean> fut = SwingExecutor.INSTANCE.submit(() -> {
+                Object[] options = new Object[]{
+                        tr("button.cancel"),
+                        tr("button.launchAnyway"),
+                };
+
+                String message = tr("runner.wrongJavaVersion",
+                        instance.getTitle(), javaVersion.getMajorVersion(), javaRuntime.getVersion());
+                int picked = JOptionPane.showOptionDialog(null,
+                        SwingHelper.htmlWrap(message),
+                        tr("launcher.javaMismatchTitle"),
+                        JOptionPane.DEFAULT_OPTION,
+                        JOptionPane.WARNING_MESSAGE,
+                        null,
+                        options,
+                        null);
+
+                return picked == 1;
+            });
+
+            try {
+                return fut.get();
+            } catch (ExecutionException | InterruptedException e) {
+                throw new RuntimeException(e);
+            }
+        }
+    }
 }

launcher/src/main/java/com/skcraft/launcher/launch/Runner.java

@@ -37,6 +37,8 @@ import java.util.List;
 import java.util.Map;
 import java.util.Optional;
 import java.util.concurrent.Callable;
+import java.util.concurrent.CancellationException;
+import java.util.function.BiPredicate;
 
 import static com.skcraft.launcher.LauncherUtils.checkInterrupted;
 import static com.skcraft.launcher.util.SharedLocale.tr;
@@ -54,6 +56,7 @@ public class Runner implements Callable<Process>, ProgressObservable {
     private final Instance instance;
     private final Session session;
     private final File extractDir;
+    private final BiPredicate<JavaRuntime, JavaVersion> javaRuntimeMismatch;
     @Getter @Setter private Environment environment = Environment.getInstance();
 
     private VersionManifest versionManifest;
@@ -66,18 +69,20 @@ public class Runner implements Callable<Process>, ProgressObservable {
 
     /**
      * Create a new instance launcher.
-     *
      *  @param launcher the launcher
      * @param instance the instance
      * @param session the session
      * @param extractDir the directory to extract to
+     * @param javaRuntimeMismatch
      */
     public Runner(@NonNull Launcher launcher, @NonNull Instance instance,
-                  @NonNull Session session, @NonNull File extractDir) {
+                  @NonNull Session session, @NonNull File extractDir,
+                  BiPredicate<JavaRuntime, JavaVersion> javaRuntimeMismatch) {
         this.launcher = launcher;
         this.instance = instance;
         this.session = session;
         this.extractDir = extractDir;
+        this.javaRuntimeMismatch = javaRuntimeMismatch;
         this.featureList = new FeatureList.Mutable();
     }
 
@@ -149,6 +154,8 @@ public class Runner implements Callable<Process>, ProgressObservable {
 
         callLaunchModifier();
 
+        verifyJavaRuntime();
+
         ProcessBuilder processBuilder = new ProcessBuilder(builder.buildCommand());
         processBuilder.directory(instance.getContentDir());
         Runner.log.info("Launching: " + builder);
@@ -166,6 +173,23 @@ public class Runner implements Callable<Process>, ProgressObservable {
         instance.modify(builder);
     }
 
+    private void verifyJavaRuntime() {
+        JavaRuntime pickedRuntime = builder.getRuntime();
+        JavaVersion targetVersion = versionManifest.getJavaVersion();
+
+        if (pickedRuntime == null || targetVersion == null) {
+            return;
+        }
+
+        if (pickedRuntime.getMajorVersion() != targetVersion.getMajorVersion()) {
+            boolean launchAnyway = javaRuntimeMismatch.test(pickedRuntime, targetVersion);
+
+            if (!launchAnyway) {
+                throw new CancellationException("Launch cancelled by user.");
+            }
+        }
+    }
+
     /**
      * Add platform-specific arguments.
      */

launcher/src/main/java/com/skcraft/launcher/swing/SwingHelper.java

@@ -70,6 +70,11 @@ public final class SwingHelper {
                 .replace("&", "&");
     }
 
+    public static String htmlWrap(String message) {
+        // To force the label to wrap, convert the message to broken HTML
+        return "<html><div style=\"width: 250px\">" + htmlEscape(message);
+    }
+
     public static void setClipboard(String text) {
         Toolkit.getDefaultToolkit().getSystemClipboard().setContents(
                 new StringSelection(text), clipboardOwner);
@@ -189,8 +194,7 @@ public final class SwingHelper {
                                          final int messageType) {
 
         if (SwingUtilities.isEventDispatchThread()) {
-            // To force the label to wrap, convert the message to broken HTML
-            String htmlMessage = "<html><div style=\"width: 250px\">" + htmlEscape(message);
+            String htmlMessage = htmlWrap(message);
 
             JPanel panel = new JPanel(new BorderLayout(0, detailsText != null ? 20 : 0));
 

launcher/src/main/resources/com/skcraft/launcher/lang/Launcher.properties

@@ -23,6 +23,7 @@ errors.selfUpdateCheckError=Checking for an update to the launcher has failed.
 button.cancel=Cancel
 button.ok=OK
 button.save=Save
+button.launchAnyway=Launch Anyway
 
 options.title = Options
 options.useProxyCheck = Use following proxy in Minecraft
@@ -88,6 +89,7 @@ launcher.noInstanceError=Please select a modpack to launch.
 launcher.noInstanceTitle=No Modpack Selected
 launcher.launchingTItle=Launching the game...
 launcher.launchingStatus=Launching ''{0}''. Please wait.
+launcher.javaMismatchTitle=Java version warning
 launcher.modpackColumn=Modpack
 launcher.notInstalledHint=(not installed)
 launcher.requiresUpdateHint=(requires update)
@@ -191,6 +193,7 @@ runner.updateRequired=This instance must be updated before it can be run.
 runner.missingLibrary={0} needs to be relaunched and updated because the library ''{1}'' is missing.
 runner.missingAssetsIndex={0} needs to be relaunched and updated because its asset index is missing.
 runner.corruptAssetsIndex={0} needs to be relaunched and updated because its asset index is corrupt.
+runner.wrongJavaVersion=Instance ''{0}'' requires Java version {1}, but could only find {2}.
 
 assets.expanding1=Expanding {0} asset... ({1} remaining)
 assets.expandingN=Expanding {0} assets... ({1} remaining)