java.nio.file.FileSystems Java Examples

@Override
public String call() throws Exception {
	ModuleLayer parentLayer = ModuleLayer.boot();
	
	// Obtain the parent Configuration 
	Path modulePath = FileSystems.getDefault().getPath(System.getProperty("module.path"));
	ModuleFinder moduleFinder = ModuleFinder.of(modulePath);
	ClassLoader systemClassLoader = ClassLoader.getSystemClassLoader();

	Configuration cf1 = parentLayer.configuration()
			.resolve(moduleFinder, ModuleFinder.of(), Set.of("java.logging"));
	
	ModuleLayer layer1 = parentLayer.defineModulesWithManyLoaders(cf1, systemClassLoader);
	
	ClassLoader cl = layer1.findLoader("java.logging");
	
	assertNull("ClassLoader returned not-null for a bootstrap "
			+ "class being loaded in a non-boot layer", cl);

	System.out.println("Thread : " + Thread.currentThread().getName() + " done!");
	return null;
}
 

@Before
public void setUp() throws Exception {
    File logsBase = new File(System.getProperty("tomcat.test.temp", "output/tmp"));
    if (!logsBase.mkdirs() && !logsBase.isDirectory()) {
        Assert.fail("Unable to create logs directory.");
    }
    Path logsBasePath = FileSystems.getDefault().getPath(logsBase.getAbsolutePath());
    logsDir = Files.createTempDirectory(logsBasePath, "test").toFile();

    generateLogFiles(logsDir, PREFIX_1, SUFIX_2, 3);
    generateLogFiles(logsDir, PREFIX_2, SUFIX_1, 3);
    generateLogFiles(logsDir, PREFIX_3, SUFIX_1, 3);
    generateLogFiles(logsDir, PREFIX_4, SUFIX_1, 3);

    Calendar date = Calendar.getInstance();
    date.add(Calendar.DAY_OF_MONTH, -3);
    SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd'T'HH-mm-ss.SSS");
    File file = new File(logsDir, PREFIX_1 + formatter.format(date.getTime()) + SUFIX_1);
    file.createNewFile();

}
 

@Test
public void includeResourcesInBundle() throws Exception {
    Path bundle = FileSystems.getDefault().getPath("target/classes/META-INF/syndesis/schemas/dstu3/bundle.json");

    String inspection;
    try (InputStream fileIn = Files.newInputStream(bundle)) {
        inspection = IOUtils.toString(fileIn, StandardCharsets.UTF_8);
    }

    String inspectionWithResources = FhirMetadataRetrieval.includeResources(inspection, "patient", "account");

    ObjectMapper mapper = io.atlasmap.v2.Json.mapper();
    XmlDocument xmlDocument = mapper.readValue(inspectionWithResources, XmlDocument.class);

    XmlComplexType resource = (XmlComplexType) xmlDocument.getFields().getField().get(0);
    Assertions.assertThat(resource.getName()).isEqualTo("tns:Bundle");
    assertCorrectPath(resource, "tns:Bundle", "tns:entry", "tns:resource", "tns:Patient");
    assertCorrectPath(resource, "tns:Bundle", "tns:entry", "tns:resource", "tns:Patient", "tns:contained", "tns:Account");
    assertCorrectPath(resource, "tns:Bundle", "tns:entry", "tns:response", "tns:outcome", "tns:Patient");
    assertCorrectPath(resource, "tns:Bundle", "tns:entry", "tns:response", "tns:outcome", "tns:Patient", "tns:contained", "tns:Account");
    assertCorrectPath(resource, "tns:Bundle", "tns:entry", "tns:resource", "tns:Account");
    assertCorrectPath(resource, "tns:Bundle", "tns:entry", "tns:resource", "tns:Account", "tns:contained", "tns:Patient");
    assertCorrectPath(resource, "tns:Bundle", "tns:entry", "tns:response", "tns:outcome", "tns:Account");
    assertCorrectPath(resource, "tns:Bundle", "tns:entry", "tns:response", "tns:outcome", "tns:Account", "tns:contained", "tns:Patient");
}
 

@Override
public void uploadMissingConfigFiles(SolrZkClient zkClient, ZkConfigManager zkConfigManager, String configName) throws IOException {
  logger.info("Check any of the configs files are missing for config ({})", configName);
  for (String configFile : configFiles) {
    if ("enumsConfig.xml".equals(configFile) && !hasEnumConfig) {
      logger.info("Config file ({}) is not needed for {}", configFile, configName);
      continue;
    }
    String zkPath = String.format("%s/%s", configName, configFile);
    if (zkConfigManager.configExists(zkPath)) {
      logger.info("Config file ({}) has already uploaded properly.", configFile);
    } else {
      logger.info("Config file ({}) is missing. Reupload...", configFile);
      FileSystems.getDefault().getSeparator();
      uploadFileToZk(zkClient,
        String.format("%s%s%s", getConfigSetFolder(), FileSystems.getDefault().getSeparator(), configFile),
        String.format("%s%s", "/configs/", zkPath));
    }
  }
}
 

@Override
public void init() {
    if (!enabled) {
        LOG.info("File watcher loaded but not enabled: {}", this.toString());
        return;
    }

    Path configFilePath = this.fileConfiguration.getPath();

    LOG.info("Adding watch on '{}'.", configFilePath);

    try {
        this.watchService = FileSystems.getDefault().newWatchService();
        Path parent = configFilePath.getParent();
        if (parent == null) {
            throw new ConfigurationError("Can not get parent directory of config file");
        }
        parent.register(this.watchService, StandardWatchEventKinds.ENTRY_MODIFY);
    } catch (IOException e) {
        throw new ConfigurationError("Error creating and registering watch service", e);
    }

    executor.submit(new Watcher(this.watchService, this.settingsService, this.fileConfiguration));
}
 

private void startEmulator() throws IOException, InterruptedException {
	boolean configPresent = Files.exists(EMULATOR_CONFIG_PATH);
	WatchService watchService = null;

	if (configPresent) {
		watchService = FileSystems.getDefault().newWatchService();
		EMULATOR_CONFIG_DIR.register(watchService, StandardWatchEventKinds.ENTRY_MODIFY);
	}

	try {
		this.emulatorProcess = new ProcessBuilder("gcloud", "beta", "emulators", "pubsub", "start")
				.start();
	}
	catch (IOException ex) {
		fail("Gcloud not found; leaving host/port uninitialized.");
	}

	if (configPresent) {
		updateConfig(watchService);
		watchService.close();
	}
	else {
		createConfig();
	}

}
 

/**
 * The main method for the ZipCat program. Run the program with an empty
 * argument list to see possible arguments.
 *
 * @param args the argument list for ZipCat
 */
public static void main(String[] args) {
    if (args.length != 2) {
        System.out.println("Usage: ZipCat zipfile fileToPrint");
    }
    /*
     * Creates AutoCloseable FileSystem and BufferedReader.
     * They will be closed automatically after the try block.
     * If reader initialization fails, then zipFileSystem will be closed
     * automatically.
     */
    try (FileSystem zipFileSystem
            = FileSystems.newFileSystem(Paths.get(args[0]),null);
            InputStream input
            = Files.newInputStream(zipFileSystem.getPath(args[1]))) {
                byte[] buffer = new byte[1024];
                int len;
                while ((len = input.read(buffer)) != -1) {
                    System.out.write(buffer, 0, len);
                }

    } catch (IOException e) {
        e.printStackTrace();
        System.exit(1);
    }
}
 

public static void main(String[] args) throws Exception {

        // create a bunch of directories. Create two tasks for each directory,
        // one to bash on cancel, the other to poll the events
        ExecutorService pool = Executors.newCachedThreadPool();
        try {
            Path top = Files.createTempDirectory("work");
            top.toFile().deleteOnExit();
            for (int i=1; i<=16; i++) {
                Path dir = Files.createDirectory(top.resolve("dir-" + i));
                WatchService watcher = FileSystems.getDefault().newWatchService();
                pool.submit(() -> handle(dir, watcher));
                pool.submit(() -> poll(watcher));
            }
        } finally {
            pool.shutdown();
        }

        // give thread pool lots of time to terminate
        if (!pool.awaitTermination(5L, TimeUnit.MINUTES))
            throw new RuntimeException("Thread pool did not terminate");

        if (failed)
            throw new RuntimeException("Test failed, see log for details");
    }
 

public static void main(String[] args) {

        Path customBaseDir = FileSystems.getDefault().getPath("D:/tmp");
        String customFilePrefix = "log_";
        String customFileSuffix = ".txt";

        try {
            Path tmpFile = Files.createTempFile(customBaseDir, customFilePrefix, customFileSuffix);
            System.out.println("Created as: " + tmpFile);
            System.out.println("Sleep for 10 seconds until deletion ...");

            File asFile = tmpFile.toFile();
            asFile.deleteOnExit();

            // simulate some operations with temp file until delete it                        
            Thread.sleep(10000);            

        } catch (IOException | InterruptedException e) {
            // handle exception, don't print it as below
            System.err.println(e);
        }
        
        System.out.println("Delete file completed ...");
    }
 

/**
 * Make sure the {@literal actionchains} subdir exists.
 * @return the {@link Path} of the {@literal} actionchains directory
 */
private Path createActionChainsDir() {
    Path targetDir = getTargetDir();
    if (!Files.exists(targetDir)) {
        try {
            Files.createDirectories(targetDir);
            if (!skipSetOwner) {
                FileSystem fileSystem = FileSystems.getDefault();
                UserPrincipalLookupService service = fileSystem.getUserPrincipalLookupService();
                UserPrincipal tomcatUser = service.lookupPrincipalByName("tomcat");
                Files.setOwner(targetDir, tomcatUser);
            }
        }
        catch (IOException e) {
            LOG.error("Could not create action chain directory " + targetDir, e);
            throw new RuntimeException(e);
        }
    }
    return targetDir;
}
 

/**
 * Test the URI of every file in the jrt file system
 */
@Test
public void testToAndFromUri() throws Exception {
    FileSystem fs = FileSystems.getFileSystem(URI.create("jrt:/"));
    Path top = fs.getPath("/");
    try (Stream<Path> stream = Files.walk(top)) {
        stream.forEach(path -> {
            URI u = path.toUri();
            assertTrue(u.getScheme().equalsIgnoreCase("jrt"));
            assertFalse(u.isOpaque());
            assertTrue(u.getAuthority() == null);
            assertEquals(u.getPath(), path.toAbsolutePath().toString());
            Path p = Paths.get(u);
            assertEquals(p, path);
        });
    }
}
 

private Map<Integer, FileSystem> createZips() throws IOException {
  var loader = getClass().getClassLoader();
  var map = new HashMap<Integer, FileSystem>();
  for (int year = 2018; year < 2030; year++) {
    var zipfile = cache.resolve(bucketName + "-" + year + ".zip");
    if (Files.notExists(zipfile)) {
      continue;
    }
    LOG.log(INFO, "Creating cache file system from {0}...", zipfile);
    var zipFileSystem = FileSystems.newFileSystem(zipfile, loader);
    if (LOG.isLoggable(INFO)) {
      var count = Files.list(zipFileSystem.getPath("/")).count();
      LOG.log(INFO, "{0} entries in {1}", count, zipFileSystem);
    }
    map.put(year, zipFileSystem);
  }
  return map;
}
 

/**
 * This method initializes private data members of this class and also creates the Control File.
 *
 * @param directory The root directory of Storage where the transaction data is stored.
 * @param segmentSizeThreshold The maximum size of each Segment.
 * @param numPartitions The total number of partitions in the cluster.
 * @param key The cluster key.
 * @throws StorageException
 * @throws IOException
 */
public StorageManager(String directory, long segmentSizeThreshold, int numPartitions, UUID key, int segmentCacheCapacity) throws IOException, StorageException {
    logger.debug("StorageManager constructor is called");
    this.directory = FileSystems.getDefault().getPath(directory);
    this.partitions = new HashMap<>();
    this.segmentSizeThreshold = segmentSizeThreshold;
    this.segmentCacheCapacity = segmentCacheCapacity;

    this.controlFile = new ControlFile(key, this.directory.resolve(ControlFile.FILE_NAME), numPartitions, true);
    logger.debug("storage opened: directory={}", directory);

    for (int id : controlFile.getPartitionIds()) {
        if (controlFile.getPartitionInfo(id).getSnapshot().isAssigned) {
            createPartition(id);
        }
    }
}
 

@Test
public void testRemovePartitionWithoutFilePreserve() throws ConcurrentUpdateException, IOException, StorageException {
    int partitionId = new Random().nextInt(NUM_PARTITION);
    String fileNameFormat = "%019d.%s";
    File dir = Files.createTempDirectory("StorageManagerTest-").toFile();
    Path partitionDir = FileSystems.getDefault().getPath(dir.getPath()).resolve(Integer.toString(partitionId));
    Path segPath = partitionDir.resolve(String.format(fileNameFormat, 0L, "seg"));
    Path idxPath = partitionDir.resolve(String.format(fileNameFormat, 0L, "idx"));

    StorageManager manager = new StorageManager(dir.getPath(), WaltzStorageConfig.DEFAULT_SEGMENT_SIZE_THRESHOLD, NUM_PARTITION, clusterKey, WaltzStorageConfig.DEFAULT_STORAGE_SEGMENT_CACHE_CAPACITY);

    try {
        manager.open(clusterKey, NUM_PARTITION);
        manager.setPartitionAssignment(partitionId, true, false);

        manager.setPartitionAssignment(partitionId, false, true);

        assertFalse(segPath.toFile().exists());
        assertFalse(idxPath.toFile().exists());
    } finally {
        manager.close();
    }
}
 

private static FileSystem getFileSystem(URI jarUri) {
    FileSystem fs = fileSystems.get(jarUri);
    if (fs == null) {
        synchronized (fileSystems) {
            fs = fileSystems.get(jarUri);
            if (fs == null) {
                try {
                    fs = FileSystems.getFileSystem(jarUri);
                } catch (FileSystemNotFoundException e1) {
                    try {
                        fs = FileSystems.newFileSystem(jarUri, Collections.emptyMap());
                    } catch (IOException e2) {
                        throw new IllegalStateException("Could not create FileSystem for " + jarUri, e2);
                    }
                }
                fileSystems.put(jarUri, fs);
            }
        }
    }
    return fs;
}
 

/**
 * This call is not thread safe, a single of FileSystem can be created for the
 * profided uri until it is closed.
 * 
 * @param uri The uri to the zip file.
 * @param env Env map.
 * @return A new FileSystem.
 * @throws IOException in case of a failure
 */
public static FileSystem newFileSystem(URI uri, Map<String, ?> env) throws IOException {
    // If Multi threading required, logic should be added to wrap this fs
    // onto a fs that handles a reference counter and close the fs only when all thread are done
    // with it.
    try {
        return FileSystems.newFileSystem(uri, env);
    } catch (IOException | ZipError ioe) {
        // TODO: (at a later date) Get rid of the ZipError catching (and instead only catch IOException)
        //  since it's a JDK bug which threw the undeclared ZipError instead of an IOException.
        //  Java 9 fixes it https://bugs.openjdk.java.net/browse/JDK-8062754

        // include the URI for which the filesystem creation failed
        throw new IOException("Failed to create a new filesystem for " + uri, ioe);
    }
}
 

public static void generateDummyPlatform(Path destination, String version) throws IOException, URISyntaxException {
    Path targetZip = destination.resolve(String.format("hybris-commerce-suite-%s.zip", version));
    Map<String, String> env = new HashMap<>();
    env.put("create", "true");
    try (FileSystem zipfs = FileSystems.newFileSystem(URI.create("jar:" + targetZip.toUri().toString()), env, null)) {
        Path sourceDir = Paths.get(TestUtils.class.getResource("/dummy-platform").toURI());
        Files.walkFileTree(sourceDir, new SimpleFileVisitor<Path>() {
            @Override
            public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
                Path relative = sourceDir.relativize(file);
                if (relative.getParent() != null) {
                    Path path = zipfs.getPath(relative.getParent().toString());
                    Files.createDirectories(path);
                }
                Path target = zipfs.getPath(relative.toString());
                Files.copy(file, target);
                return super.visitFile(file, attrs);
            }
        });
        String build = String.format("version=%s\n", version);
        Path buildNumber = zipfs.getPath("hybris", "bin", "platform", "build.number");
        Files.write(buildNumber, build.getBytes(), StandardOpenOption.CREATE, StandardOpenOption.TRUNCATE_EXISTING);
    }
}
 

static void validate(Module module) throws IOException {
    ModuleDescriptor md = module.getDescriptor();

    // read m1/module-info.class
    FileSystem fs = FileSystems.newFileSystem(URI.create("jrt:/"),
                                              Collections.emptyMap());
    Path path = fs.getPath("/", "modules", module.getName(), "module-info.class");
    ModuleDescriptor md1 = ModuleDescriptor.read(Files.newInputStream(path));


    // check the module descriptor of a system module and read from jimage
    checkPackages(md.packages(), "p1", "p2");
    checkPackages(md1.packages(), "p1", "p2");

    try (InputStream in = Files.newInputStream(path)) {
        checkModuleTargetAttribute(in, "p1");
    }
}
 

static Stream<Path> jrtPaths() {
    FileSystem jrt = FileSystems.getFileSystem(URI.create("jrt:/"));
    Path root = jrt.getPath("/");

    try {
        return Files.walk(root)
                .filter(p -> p.getNameCount() > 1)
                .filter(p -> p.toString().endsWith(".class"));
    } catch (IOException x) {
        throw new UncheckedIOException(x);
    }
}
 

/**
 * Appends a new file with name {@code filename} and contents
 * {@code fileContents} into existing jar file with name {@code jarFile}.
 *
 * @param jarFile      name of jar file to append
 * @param filename     name of new file to append in jar
 * @param fileContents contents of new file to append in jar
 * @throws IOException
 */
private static void appendJar(String jarFile, String filename, String fileContents) throws IOException {
	Map<String, String> env = new HashMap<>();
	env.put("create", "true");
	try (FileSystem fileSystem = FileSystems.newFileSystem(URI.create("jar:" + Paths.get(jarFile).toUri()), env)) {
		try (Writer writer = Files.newBufferedWriter(fileSystem.getPath(filename), StandardCharsets.UTF_8,
				StandardOpenOption.CREATE)) {
			writer.write(fileContents);
		}
	}
}
 

private static void openAndCloseWatcher(Path dir) {
    FileSystem fs = FileSystems.getDefault();
    for (int i = 0; i < ITERATIONS_COUNT; i++) {
        try (WatchService watcher = fs.newWatchService()) {
            dir.register(watcher, ENTRY_CREATE, ENTRY_DELETE, ENTRY_MODIFY);
        } catch (IOException ioe) {
            // ignore
        }
    }
}
 

private static String[] getLauncher() throws IOException {
    String platform = getPlatform();
    if (platform == null) {
        return null;
    }

    String launcher = TEST_SRC + File.separator + platform + "-" + ARCH +
                      File.separator + "launcher";

    final FileSystem FS = FileSystems.getDefault();
    Path launcherPath = FS.getPath(launcher);

    final boolean hasLauncher = Files.isRegularFile(launcherPath, LinkOption.NOFOLLOW_LINKS)&&
                                Files.isReadable(launcherPath);
    if (!hasLauncher) {
        System.out.println("Launcher [" + launcher + "] does not exist. Skipping the test.");
        return null;
    }

    // It is impossible to store an executable file in the source control
    // We need to copy the launcher to the working directory
    // and set the executable flag
    Path localLauncherPath = FS.getPath(WORK_DIR, "launcher");
    Files.copy(launcherPath, localLauncherPath,
               StandardCopyOption.REPLACE_EXISTING,
               StandardCopyOption.COPY_ATTRIBUTES);
    if (!Files.isExecutable(localLauncherPath)) {
        Set<PosixFilePermission> perms = new HashSet<>(
            Files.getPosixFilePermissions(
                localLauncherPath,
                LinkOption.NOFOLLOW_LINKS
            )
        );
        perms.add(PosixFilePermission.OWNER_EXECUTE);
        Files.setPosixFilePermissions(localLauncherPath, perms);
    }
    return new String[] {launcher, localLauncherPath.toAbsolutePath().toString()};
}
 

private void handleIncludes(Vector<String> includes, Vector<BuildConfig> allConfigs) {
   for (String path : includes)  {
      FileTreeCreatorVC7 ftc = new FileTreeCreatorVC7(FileSystems.getDefault().getPath(path) , allConfigs, this);
      try {
         ftc.writeFileTree();
      } catch (IOException e) {
         e.printStackTrace();
      }
   }
}
 

@Test(expected = CommandLine.ExecutionException.class)
public void shouldFailIfOutputDirectoryNonEmpty() throws IOException {
  runCmdAndCheckOutput(
      cmd(),
      "/operator/config_generate_keys.json",
      FileSystems.getDefault().getPath("."),
      "genesis.json",
      true,
      asList("key.pub", "key.priv"));
}
 

@Override
public String toString(final Object obj) {
    final Path path = (Path)obj;
    if (path.getFileSystem() == FileSystems.getDefault()) {
        final String localPath = path.toString();
        if (File.separatorChar != '/') {
            return localPath.replace(File.separatorChar, '/');
        } else {
            return localPath;
        }
    } else {
        return path.toUri().toString();
    }
}
 

public void augmentclassPath(HashMap<String, ClassProvider> clsToClasspath){

			synchronized(strToURI.computeIfAbsent(jarUri, (URI a) -> a)) {
				try (FileSystem zipfs = FileSystems.newFileSystem(jarUri, env)) {
					Path root = zipfs.getPath("/");
					Files.walk(root).filter(a -> !Files.isDirectory(a) && a.toString().endsWith(".class")).forEach( a -> addToClsP(a.toString(), clsToClasspath) );
		        } catch (IOException e) {
					e.printStackTrace();
				} 
			}
		}
 

private static void startWatchThread() throws IOException
{
    if ( watchThread==null ) {
        watchService = FileSystems.getDefault().newWatchService();
        watchThread = new Thread(()->{
            watchThreadFunc();
        }, "File watch thread");
        watchThread.setDaemon(true);
        watchThread.start();
    }
}
 

@Test
public void testSnapshot() throws Exception {
    Path tempDir = Files.createTempDirectory(FileSystems.getDefault().getPath("./target"), null);
    File file = null;

    try {
        KieServices ks = KieServices.Factory.get();
        ReleaseId releaseId = ks.newReleaseId( "org.kie", "scanner-test", "1.0-SNAPSHOT" );

        createKieJar( ks, releaseId, "R1" );

        KieContainer kieContainer = ks.newKieContainer( releaseId );

        KieSession ksession = kieContainer.newKieSession();
        checkKSession( ksession, "R1" );

        KieScanner scanner = ks.newKieScanner( kieContainer, tempDir.toString() );
        scanner.scanNow();

        ksession = kieContainer.newKieSession();
        checkKSession( ksession, "R1" );

        file = write( createKieJar( ks, releaseId, "R2" ), tempDir, releaseId );
        ksession = kieContainer.newKieSession();
        checkKSession( ksession, "R1" );

        scanner.scanNow();
        ksession = kieContainer.newKieSession();
        checkKSession( ksession, "R2" );
    } finally {
        if (file != null) {
            file.delete();
        }
        Files.delete(tempDir);
    }
}
 

public static String[] getSupportedLanguages() {
    ArrayList<Path> filesList = new ArrayList<>();
    try {
        URI uri = Utils.class.getResource("/rip.properties").toURI();

        Path myPath;
        if (uri.getScheme().equals("jar")) {
            FileSystem fileSystem = FileSystems.newFileSystem(uri, Collections.<String, Object>emptyMap());
            myPath = fileSystem.getPath("/");
        } else {
            myPath = Paths.get(uri).getParent();
        }

        Files.walk(myPath, 1).filter(p -> p.toString().contains("LabelsBundle_")).distinct()
                .forEach(filesList::add);

        String[] langs = new String[filesList.size()];
        for (int i = 0; i < filesList.size(); i++) {
            Matcher matcher = pattern.matcher(filesList.get(i).toString());
            if (matcher.find())
                langs[i] = matcher.group("lang");
        }

        return langs;
    } catch (Exception e) {
        e.printStackTrace();
        // On error return default language
        return new String[] { DEFAULT_LANG };
    }
}
 

public synchronized static void init(String agentArguments, Instrumentation instrumentation, boolean premain) {
    if (Boolean.getBoolean("ElasticApm.attached")) {
        // agent is already attached; don't attach twice
        // don't fail as this is a valid case
        // for example, Spring Boot restarts the application in dev mode
        return;
    }

    String javaVersion = System.getProperty("java.version");
    String javaVmName = System.getProperty("java.vm.name");
    if (!isJavaVersionSupported(javaVersion, javaVmName)) {
        // Gracefully abort agent startup is better than unexpected failure down the road when we known a given JVM
        // version is not supported. Agent might trigger known JVM bugs causing JVM crashes, notably on early Java 8
        // versions (but fixed in later versions), given those versions are obsolete and agent can't have workarounds
        // for JVM internals, there is no other option but to use an up-to-date JVM instead.
        System.err.println(String.format("Failed to start agent - JVM version not supported: %s", javaVersion));
        return;
    }

    try {
        // workaround for classloader deadlock https://bugs.openjdk.java.net/browse/JDK-8194653
        FileSystems.getDefault();

        final File agentJarFile = getAgentJarFile();
        try (JarFile jarFile = new JarFile(agentJarFile)) {
            instrumentation.appendToBootstrapClassLoaderSearch(jarFile);
        }
        // invoking via reflection to make sure the class is not loaded by the system classloader,
        // but only from the bootstrap classloader
        Class.forName("co.elastic.apm.agent.bci.ElasticApmAgent", true, null)
            .getMethod("initialize", String.class, Instrumentation.class, File.class, boolean.class)
            .invoke(null, agentArguments, instrumentation, agentJarFile, premain);
        System.setProperty("ElasticApm.attached", Boolean.TRUE.toString());
    } catch (Exception e) {
        System.err.println("Failed to start agent");
        e.printStackTrace();
    }
}