Introduce the ability to generate AppCDS

core/deployment/src/main/java/io/quarkus/deployment/QuarkusAugmentor.java

@@ -10,8 +10,6 @@
 import java.util.Properties;
 import java.util.Set;
 import java.util.function.Consumer;
-import java.util.regex.Matcher;
-import java.util.regex.Pattern;
 
 import org.eclipse.microprofile.config.spi.ConfigBuilder;
 import org.eclipse.microprofile.config.spi.ConfigProviderResolver;
@@ -37,6 +35,7 @@
 import io.quarkus.deployment.pkg.builditem.BuildSystemTargetBuildItem;
 import io.quarkus.deployment.pkg.builditem.CurateOutcomeBuildItem;
 import io.quarkus.deployment.pkg.builditem.DeploymentResultBuildItem;
+import io.quarkus.deployment.util.JavaVersionUtil;
 import io.quarkus.runtime.LaunchMode;
 
 public class QuarkusAugmentor {
@@ -78,9 +77,7 @@ public class QuarkusAugmentor {
     }
 
     public BuildResult run() throws Exception {
-        Pattern pattern = Pattern.compile("(?:1\\.)?(\\d+)(?:\\..*)?");
-        Matcher matcher = pattern.matcher(System.getProperty("java.version", ""));
-        if (matcher.matches() && Integer.parseInt(matcher.group(1)) < 11) {
+        if (!JavaVersionUtil.isJava11OrHigher()) {
             log.warn("Using Java versions older than 11 to build"
                     + " Quarkus applications is deprecated and will be disallowed in a future release!");
         }

core/deployment/src/main/java/io/quarkus/deployment/pkg/PackageConfig.java

@@ -88,4 +88,29 @@ public class PackageConfig {
      */
     @ConfigItem
     public Optional<String> outputName;
+
+    /**
+     * Whether to automate the creation of AppCDS. This has not effect when a native binary is needed and will be ignored in
+     * that case.
+     * Furthermore, this options only works for Java 11+.
+     * Finally, care must be taken to use the same exact JVM version when building and running the application.
+     */
+    @ConfigItem
+    public boolean createAppcds;
+
+    public boolean isAnyJarType() {
+        return (type.equalsIgnoreCase(PackageConfig.LEGACY) ||
+                type.equalsIgnoreCase(PackageConfig.JAR) ||
+                type.equalsIgnoreCase(PackageConfig.FAST_JAR) ||
+                type.equalsIgnoreCase(PackageConfig.UBER_JAR));
+    }
+
+    public boolean isFastJar() {
+        return type.equalsIgnoreCase(PackageConfig.FAST_JAR);
+    }
+
+    public boolean isLegacyJar() {
+        return (type.equalsIgnoreCase(PackageConfig.LEGACY) ||
+                type.equalsIgnoreCase(PackageConfig.JAR));
+    }
 }

core/deployment/src/main/java/io/quarkus/deployment/pkg/builditem/AppCDSRequestedBuildItem.java

@@ -0,0 +1,25 @@
+package io.quarkus.deployment.pkg.builditem;
+
+import java.nio.file.Path;
+
+import io.quarkus.builder.item.SimpleBuildItem;
+
+/**
+ * Build item to notify the indicate to the the various steps that AppCDS generation
+ * has been requested
+ */
+public final class AppCDSRequestedBuildItem extends SimpleBuildItem {
+
+    /**
+     * Directory where various files needed for AppCDS generation will reside
+     */
+    private final Path appCDSDir;
+
+    public AppCDSRequestedBuildItem(Path appCDSDir) {
+        this.appCDSDir = appCDSDir;
+    }
+
+    public Path getAppCDSDir() {
+        return appCDSDir;
+    }
+}

core/deployment/src/main/java/io/quarkus/deployment/pkg/builditem/AppCDSResultBuildItem.java

@@ -0,0 +1,24 @@
+package io.quarkus.deployment.pkg.builditem;
+
+import java.nio.file.Path;
+
+import io.quarkus.builder.item.SimpleBuildItem;
+
+/**
+ * A build item containing the result of the AppCDS generation process
+ */
+public final class AppCDSResultBuildItem extends SimpleBuildItem {
+
+    /**
+     * The file containing the generated AppCDS
+     */
+    private final Path appCDS;
+
+    public AppCDSResultBuildItem(Path appCDS) {
+        this.appCDS = appCDS;
+    }
+
+    public Path getAppCDS() {
+        return appCDS;
+    }
+}

core/deployment/src/main/java/io/quarkus/deployment/pkg/steps/AppCDSBuildStep.java

@@ -0,0 +1,244 @@
+package io.quarkus.deployment.pkg.steps;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Optional;
+import java.util.function.BooleanSupplier;
+
+import org.jboss.logging.Logger;
+
+import io.quarkus.bootstrap.util.IoUtils;
+import io.quarkus.deployment.annotations.BuildProducer;
+import io.quarkus.deployment.annotations.BuildStep;
+import io.quarkus.deployment.pkg.PackageConfig;
+import io.quarkus.deployment.pkg.builditem.AppCDSRequestedBuildItem;
+import io.quarkus.deployment.pkg.builditem.AppCDSResultBuildItem;
+import io.quarkus.deployment.pkg.builditem.ArtifactResultBuildItem;
+import io.quarkus.deployment.pkg.builditem.JarBuildItem;
+import io.quarkus.deployment.pkg.builditem.OutputTargetBuildItem;
+import io.quarkus.deployment.steps.MainClassBuildStep;
+import io.quarkus.deployment.util.JavaVersionUtil;
+import io.quarkus.runtime.LaunchMode;
+
+public class AppCDSBuildStep {
+
+    private static final Logger log = Logger.getLogger(AppCDSBuildStep.class);
+    public static final String JDK_CLASSLIST_FILE = "classlist";
+    public static final String CLASSES_LIST_FILE_NAME = "classes.lst";
+
+    @BuildStep(onlyIf = AppCDSRequired.class)
+    public void requested(OutputTargetBuildItem outputTarget, BuildProducer<AppCDSRequestedBuildItem> producer)
+            throws IOException {
+        Path appCDSDir = outputTarget.getOutputDirectory().resolve("appcds");
+        IoUtils.recursiveDelete(appCDSDir);
+        Files.createDirectories(appCDSDir);
+
+        producer.produce(new AppCDSRequestedBuildItem(outputTarget.getOutputDirectory().resolve("appcds")));
+    }
+
+    @BuildStep
+    public void build(Optional<AppCDSRequestedBuildItem> appCDsRequested,
+            JarBuildItem jarResult, PackageConfig packageConfig,
+            BuildProducer<AppCDSResultBuildItem> appCDS,
+            BuildProducer<ArtifactResultBuildItem> artifactResult) throws Exception {
+        if (!appCDsRequested.isPresent()) {
+            return;
+        }
+
+        Path appCDSDir = appCDsRequested.get().getAppCDSDir();
+        String javaHomeStr = System.getProperty("java.home");
+        Path javaHomeDir = Paths.get(javaHomeStr);
+        Path jdkClassList = javaHomeDir.resolve("lib").resolve(JDK_CLASSLIST_FILE);
+        if (!jdkClassList.toFile().exists()) {
+            log.warnf(
+                    "In order to create AppCDS the JDK used to build the Quarkus application must contain a file named '%s' in the its 'lib' directory.",
+                    JDK_CLASSLIST_FILE);
+            return;
+        }
+        String javaExecutableStr = "java";
+        String javaBinStr = javaHomeStr + File.separator + "bin" + File.separator + javaExecutableStr; //TODO do we need to add '.exe' here for Windows?
+        if (!new File(javaBinStr).canExecute()) {
+            log.warnf(
+                    "In order to create AppCDS the JDK used to build the Quarkus application must contain an executable named '%s' in its 'bin' directory.",
+                    javaBinStr);
+            return;
+        }
+
+        Path classesLstPath = createClassesLst(packageConfig, jarResult, javaBinStr, appCDSDir);
+        if (classesLstPath == null) {
+            log.warn("Unable to create AppCDS because " + CLASSES_LIST_FILE_NAME + " was not created.");
+            return;
+        }
+
+        log.debug("'" + CLASSES_LIST_FILE_NAME + "' successfully created.");
+
+        log.info("Launching AppCDS creation process.");
+        Path appCDSPath = createAppCDS(jarResult, javaBinStr, classesLstPath, packageConfig.isFastJar());
+        if (appCDSPath == null) {
+            log.warn("Unable to create AppCDS.");
+            return;
+        }
+
+        log.infof(
+                "AppCDS successfully created at: '%s'.\nTo ensure they are loaded properly, " +
+                        "run the application jar from its directory and also add the '-XX:SharedArchiveFile=app-cds.jsa' " +
+                        "JVM flag.\nMoreover, make sure to use the same java version to run the application as was used to build it.",
+                appCDSPath.toAbsolutePath().toString());
+
+        appCDS.produce(new AppCDSResultBuildItem(appCDSPath));
+        artifactResult.produce(new ArtifactResultBuildItem(appCDSPath, "appCDS", Collections.emptyMap()));
+    }
+
+    /**
+     * @return The path of the created classes.lst file or null of the file was not created
+     */
+    private Path createClassesLst(PackageConfig packageConfig, JarBuildItem jarResult,
+            String javaBin, Path appCDSDir) {
+
+        boolean isFastFar = packageConfig.isFastJar();
+
+        List<String> command = new ArrayList<>(5);
+        command.add(javaBin);
+        command.add("-XX:DumpLoadedClassList=" + CLASSES_LIST_FILE_NAME);
+        command.add(String.format("-D%s=true", MainClassBuildStep.GENERATE_APP_CDS_SYSTEM_PROPERTY));
+        command.add("-jar");
+        if (isFastFar) {
+            command.add(jarResult.getLibraryDir().getParent().resolve(JarResultBuildStep.QUARKUS_RUN_JAR).toAbsolutePath()
+                    .toString());
+        } else {
+            command.add(jarResult.getPath().toAbsolutePath().toString());
+        }
+
+        if (log.isDebugEnabled()) {
+            log.debugf("Launching command: '%s' to create '" + CLASSES_LIST_FILE_NAME + "' AppCDS.", String.join(" ", command));
+        }
+
+        int exitCode;
+        try {
+            ProcessBuilder processBuilder = new ProcessBuilder(command)
+                    .directory(appCDSDir.toFile());
+            if (log.isDebugEnabled()) {
+                processBuilder.inheritIO();
+            } else {
+                processBuilder.redirectError(NULL_FILE);
+                processBuilder.redirectOutput(NULL_FILE);
+            }
+            exitCode = processBuilder.start().waitFor();
+        } catch (Exception e) {
+            log.debug("Failed to launch process used to create '" + CLASSES_LIST_FILE_NAME + "'.", e);
+            return null;
+        }
+
+        if (exitCode != 0) {
+            log.debugf("The process that was supposed to create AppCDS exited with error code: %d.", exitCode);
+            return null;
+        }
+
+        return appCDSDir.resolve(CLASSES_LIST_FILE_NAME);
+    }
+
+    /**
+     * @return The path of the created app-cds.jsa file or null of the file was not created
+     */
+    private Path createAppCDS(JarBuildItem jarResult, String javaBin,
+            Path classesLstPath, boolean isFastFar) {
+
+        Path workingDirectory = isFastFar ? jarResult.getPath().getParent().getParent() : jarResult.getPath().getParent();
+        Path appCDSPath = workingDirectory.resolve("app-cds.jsa");
+        if (appCDSPath.toFile().exists()) {
+            try {
+                Files.delete(appCDSPath);
+            } catch (IOException e) {
+                log.debug("Unable to delete existing 'app-cds.jsa' file.", e);
+            }
+        }
+
+        List<String> command = new ArrayList<>(6);
+        command.add(javaBin);
+        command.add("-Xshare:dump");
+        command.add("-XX:SharedClassListFile=" + classesLstPath.toAbsolutePath().toString());
+        // We use the relative paths because at runtime 'java -XX:SharedArchiveFile=... -jar ...' expects the AppCDS and jar files
+        // to match exactly what was used at build time.
+        // For that reason we also run the creation process from inside the output directory,
+        // The end result is that users can simply use 'java -XX:SharedArchiveFile=app-cds.jsa -jar app.jar'
+        command.add("-XX:SharedArchiveFile=" + appCDSPath.getFileName().toString());
+        command.add("--class-path");
+        if (isFastFar) {
+            command.add(JarResultBuildStep.QUARKUS_RUN_JAR);
+        } else {
+            command.add(jarResult.getPath().getFileName().toString());
+        }
+
+        if (log.isDebugEnabled()) {
+            log.debugf("Launching command: '%s' to create final AppCDS.", String.join(" ", command));
+        }
+
+        int exitCode;
+        try {
+            ProcessBuilder processBuilder = new ProcessBuilder(command)
+                    .directory(workingDirectory.toFile());
+            if (log.isDebugEnabled()) {
+                processBuilder.inheritIO();
+            } else {
+                processBuilder.redirectError(NULL_FILE);
+                processBuilder.redirectOutput(NULL_FILE);
+            }
+            exitCode = processBuilder.start().waitFor();
+        } catch (Exception e) {
+            log.debug("Failed to launch process used to create AppCDS.", e);
+            return null;
+        }
+
+        if (exitCode != 0) {
+            log.debugf("The process that was supposed to create AppCDS exited with error code: %d.", exitCode);
+            return null;
+        }
+
+        if (!appCDSPath.toFile().exists()) { // shouldn't happen, but let's avoid any surprises
+            return null;
+        }
+
+        return appCDSPath;
+    }
+
+    static class AppCDSRequired implements BooleanSupplier {
+
+        private final PackageConfig packageConfig;
+        private final LaunchMode launchMode;
+
+        AppCDSRequired(PackageConfig packageConfig, LaunchMode launchMode) {
+            this.packageConfig = packageConfig;
+            this.launchMode = launchMode;
+        }
+
+        @Override
+        public boolean getAsBoolean() {
+            if (launchMode != LaunchMode.NORMAL) {
+                return false;
+            }
+
+            if (!packageConfig.createAppcds || !packageConfig.isAnyJarType()) {
+                return false;
+            }
+
+            if (!JavaVersionUtil.isJava11OrHigher()) {
+                log.warn("AppCDS can only be used with Java 11+.");
+                return false;
+            }
+            return true;
+        }
+    }
+
+    // copied from Java 9
+    // TODO remove when we move to Java 11
+
+    private static final File NULL_FILE = new File(
+            (System.getProperty("os.name")
+                    .startsWith("Windows") ? "NUL" : "/dev/null"));
+}