Example usage for java.lang ClassLoader loadClass

List of usage examples for java.lang ClassLoader loadClass

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Introduction

In this page you can find the example usage for java.lang ClassLoader loadClass.

Prototype

public Class<?> loadClass(String name) throws ClassNotFoundException

Source Link

Document

Loads the class with the specified binary name.

Usage

From source file:com.scaleunlimited.cascading.DatumCompilerTest.java

@Test
public void testUUID() throws Exception {
    CompiledDatum result = DatumCompiler.generate(MyUUIDDatumTemplate.class);

    File baseDir = new File("build/test/DatumCompilerTest/testUUID/");
    FileUtils.deleteDirectory(baseDir);//from   w w w  .ja va  2  s. c om
    File srcDir = new File(baseDir, result.getPackageName().replaceAll("\\.", "/"));
    assertTrue(srcDir.mkdirs());

    File codeFile = new File(srcDir, result.getClassName() + ".java");
    OutputStream os = new FileOutputStream(codeFile);
    IOUtils.write(result.getClassCode(), os, "UTF-8");
    os.close();

    // Compile with Janino, give it a try. We have Janino since
    // it's a cascading dependency, but probably want to add a test
    // dependency on it.

    ClassLoader cl = new JavaSourceClassLoader(this.getClass().getClassLoader(), // parentClassLoader
            new File[] { baseDir }, // optionalSourcePath
            (String) null // optionalCharacterEncoding
    );

    // WARNING - we have to use xxxDatumTemplate as the base name, so that the code returned
    // by the compiler is for type xxxDatum. Otherwise when we try to load the class here,
    // we'll likely get the base (template) class, which will mask our generated class.
    Class clazz = cl.loadClass(result.getPackageName() + "." + result.getClassName());
    assertEquals("MyUUIDDatum", clazz.getSimpleName());

    Constructor c = clazz.getConstructor(UUID.class);
    BaseDatum datum = (BaseDatum) c.newInstance(UUID.randomUUID());

    // Verify that it can be serialized with Hadoop.
    // TODO figure out why Hadoop serializations aren't available???
    /*
    BasePlatform testPlatform = new HadoopPlatform(DatumCompilerTest.class);
    Tap tap = testPlatform.makeTap( testPlatform.makeBinaryScheme(datum.getFields()), 
                testPlatform.makePath("build/test/DatumCompilerTest/testSimpleSchema/"));
    TupleEntryCollector writer = tap.openForWrite(testPlatform.makeFlowProcess());
    writer.add(datum.getTuple());
    writer.close();
            
    TupleEntryIterator iter = tap.openForRead(testPlatform.makeFlowProcess());
    TupleEntry te = iter.next();
            
    // TODO how to test round-trip?
     */
}

From source file:com.microsoft.tfs.core.internal.db.ConnectionConfiguration.java

public ConnectionConfiguration(final PersistenceStore cacheStore, final String pathId,
        final boolean verboseInput) {
    Check.notNull(cacheStore, "cacheStore"); //$NON-NLS-1$

    pathIdentifer = Metadata.SCHEMA_VERSION + "-" + pathId; //$NON-NLS-1$
    verbose = verboseInput;//w w  w .j a va2 s .  co  m

    configuration = new Configuration(ConnectionConfiguration.class, "/" + DB_PROPS_FILE_NAME); //$NON-NLS-1$

    driverClass = configuration.getConfiguration(DRIVER_CONFIG_KEY, DRIVER_DEFAULT);
    url = configuration.getConfiguration(URL_CONFIG_KEY, URL_DEFAULT);
    username = configuration.getConfiguration(USERNAME_CONFIG_KEY, USERNAME_DEFAULT);
    password = configuration.getConfiguration(PASSWORD_CONFIG_KEY, PASSWORD_DEFAULT);

    final String extraClasspath = configuration.getConfiguration(CLASSPATH_CONFIG_KEY, null);

    if (url.equals(URL_DEFAULT)) {
        if (cacheStore instanceof VersionedVendorFilesystemPersistenceStore) {
            /*
             * This may still return null if no candidate areas were
             * lockable.
             */
            databaseDiskDirectory = getDirectoryForDiskDatabase(
                    (VersionedVendorFilesystemPersistenceStore) cacheStore, pathIdentifer);
        } else {
            log.warn(MessageFormat.format(
                    "The {0} used to create {1} is not a {2}, which is required to retarget HSQLDB storage (it can only use files).  The fallback URL of {3} will be used.", //$NON-NLS-1$
                    PersistenceStore.class.getName(), ConnectionConfiguration.class.getName(),
                    VersionedVendorFilesystemPersistenceStore.class.getName(), URL_FALLBACK));
        }

        if (databaseDiskDirectory == null) {
            url = URL_FALLBACK;
        } else {
            final File db = new File(databaseDiskDirectory, "teamexplorer"); //$NON-NLS-1$
            url = "jdbc:hsqldb:file:" + db.getAbsolutePath(); //$NON-NLS-1$
        }
    }

    ClassLoader jdbcLoader = getClass().getClassLoader();

    if (extraClasspath != null) {
        final File extraJar = new File(extraClasspath);
        try {
            jdbcLoader = new URLClassLoader(new URL[] { extraJar.toURL() }, jdbcLoader);
        } catch (final MalformedURLException ex) {
            throw new RuntimeException(ex);
        }
    }

    try {
        driver = (Driver) jdbcLoader.loadClass(driverClass).newInstance();
    } catch (final Throwable t) {
        throw new RuntimeException(MessageFormat.format("unable to load specified jdbc driver class [{0}]", //$NON-NLS-1$
                driverClass), t);
    }

    if (verbose) {
        System.out.println(MessageFormat.format("DB connection URL:     [{0}]", url)); //$NON-NLS-1$
        System.out.println(MessageFormat.format("DB driver class:       [{0}] (version {1}.{2})", //$NON-NLS-1$
                driver.getClass().getName(), Integer.toString(driver.getMajorVersion()),
                Integer.toString(driver.getMinorVersion())));

        System.out.println(MessageFormat.format("DB driver loaded from: [{0}]", //$NON-NLS-1$
                getDriverClassURL().toExternalForm()));
    }
}

From source file:com.github.helenusdriver.commons.lang3.reflect.ReflectionUtils.java

/**
 * Find all classes from a given jar file and add them to the provided
 * list./*from   www  .  ja va  2  s . c  o  m*/
 *
 * @author paouelle
 *
 * @param classes the non-<code>null</code> collection of classes where to add new
 *        found classes
 * @param url the non-<code>null</code> url for the jar where to find classes
 * @param resource the non-<code>null</code> resource being scanned that
 *        corresponds to given package
 * @param cl the classloader to find the classes with
 */
private static void findClassesFromJar(Collection<Class<?>> classes, URL url, String resource, ClassLoader cl) {
    try {
        final JarURLConnection conn = (JarURLConnection) url.openConnection();
        final URL jurl = conn.getJarFileURL();

        try (final JarInputStream jar = new JarInputStream(jurl.openStream());) {
            while (true) {
                final JarEntry entry = jar.getNextJarEntry();

                if (entry == null) {
                    break;
                }
                final String name = entry.getName();

                if (name.endsWith(".class") && name.startsWith(resource)) {
                    final String cname = name.substring(0, name.length() - 6 // 6 for .class
                    ).replace(File.separatorChar, '.');

                    try {
                        classes.add(cl.loadClass(cname));
                    } catch (ClassNotFoundException e) { // ignore it
                    }
                }
            }
        }
    } catch (IOException e) {
        throw new IllegalArgumentException("unable to find classes in package", e);
    }
}

From source file:com.scaleunlimited.cascading.DatumCompilerTest.java

@Test
public void testSimpleSchema() throws Exception {
    CompiledDatum result = DatumCompiler.generate(MyDatumTemplate.class);

    File baseDir = new File("build/test/DatumCompilerTest/testSimpleSchema/");
    FileUtils.deleteDirectory(baseDir);//from w  w w .  j a  va  2s  . c om
    File srcDir = new File(baseDir, result.getPackageName().replaceAll("\\.", "/"));
    assertTrue(srcDir.mkdirs());

    File codeFile = new File(srcDir, result.getClassName() + ".java");
    OutputStream os = new FileOutputStream(codeFile);
    IOUtils.write(result.getClassCode(), os, "UTF-8");
    os.close();

    // Compile with Janino, give it a try. We have Janino since
    // it's a cascading dependency, but probably want to add a test
    // dependency on it.

    ClassLoader cl = new JavaSourceClassLoader(this.getClass().getClassLoader(), // parentClassLoader
            new File[] { baseDir }, // optionalSourcePath
            (String) null // optionalCharacterEncoding
    );

    // WARNING - we have to use xxxDatumTemplate as the base name, so that the code returned
    // by the compiler is for type xxxDatum. Otherwise when we try to load the class here,
    // we'll likely get the base (template) class, which will mask our generated class.
    Class clazz = cl.loadClass(result.getPackageName() + "." + result.getClassName());
    assertEquals("MyDatum", clazz.getSimpleName());

    // Verify that we have a constructor which takes all of the fields.
    //        private String _name;
    //        private int ageAndRisk;
    //        private Date _date;
    //        private Tuple _aliases;
    //        private String[] _phoneNumbers
    // private MyDatumEnum _enum

    Constructor c = clazz.getConstructor(String.class, int.class, Date.class, Tuple.class, String[].class,
            MyDatumEnum.class);
    BaseDatum datum = (BaseDatum) c.newInstance("robert", 25, new Date(), new Tuple("bob", "rob"),
            new String[] { "555-1212", "555-4848" }, MyDatumEnum.DATUM_COMPILER_ENUM_2);

    // Verify that it can be serialized with Hadoop.
    // TODO figure out why Hadoop serializations aren't available???
    /*
    BasePlatform testPlatform = new HadoopPlatform(DatumCompilerTest.class);
    Tap tap = testPlatform.makeTap( testPlatform.makeBinaryScheme(datum.getFields()), 
                testPlatform.makePath("build/test/DatumCompilerTest/testSimpleSchema/"));
    TupleEntryCollector writer = tap.openForWrite(testPlatform.makeFlowProcess());
    writer.add(datum.getTuple());
    writer.close();
            
    TupleEntryIterator iter = tap.openForRead(testPlatform.makeFlowProcess());
    TupleEntry te = iter.next();
            
    // TODO how to test round-trip?
     */
}

From source file:com.netflix.simianarmy.basic.BasicSimianArmyContext.java

/**
 * Load a class specified by the config; for drop-in replacements.
 * (Duplicates a method in MonkeyServer; refactor to util?).
 *
 * @param key/*w  w w . j  a  v a 2 s  .co m*/
 * @return
 */
@SuppressWarnings("rawtypes")
private Class loadClientClass(String key) {
    ClassLoader classLoader = getClass().getClassLoader();
    try {
        String clientClassName = config.getStrOrElse(key, null);
        if (clientClassName == null || clientClassName.isEmpty()) {
            LOGGER.info("using standard class for " + key);
            return null;
        }
        Class newClass = classLoader.loadClass(clientClassName);
        LOGGER.info("using " + key + " loaded " + newClass.getCanonicalName());
        return newClass;
    } catch (ClassNotFoundException e) {
        throw new RuntimeException("Could not load " + key, e);
    }
}

From source file:org.bytesoft.bytejta.supports.spring.TransactionEndpointPostProcessor.java

public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
    ClassLoader cl = Thread.currentThread().getContextClassLoader();

    BeanDefinition protocolDef = null;//w ww  .ja v a  2 s. com

    List<BeanDefinition> beanDefList = new ArrayList<BeanDefinition>();
    String[] beanNameArray = beanFactory.getBeanDefinitionNames();
    for (int i = 0; i < beanNameArray.length; i++) {
        String beanName = beanNameArray[i];
        BeanDefinition beanDef = beanFactory.getBeanDefinition(beanName);
        String beanClassName = beanDef.getBeanClassName();

        Class<?> beanClass = null;
        try {
            beanClass = cl.loadClass(beanClassName);
        } catch (Exception ex) {
            continue;
        }

        if (TransactionEndpointAware.class.isAssignableFrom(beanClass)) {
            beanDefList.add(beanDef);
        } else if (ProtocolConfig.class.isAssignableFrom(beanClass)) {
            if (protocolDef == null) {
                protocolDef = beanDef;
            } else {
                throw new FatalBeanException(
                        "There are more than one com.alibaba.dubbo.config.ProtocolConfig was found!");
            }
        }
    }

    if (protocolDef == null) {
        throw new FatalBeanException(
                "No configuration of class com.alibaba.dubbo.config.ProtocolConfig was found.");
    }

    MutablePropertyValues protocolValues = protocolDef.getPropertyValues();
    PropertyValue protocolValue = protocolValues.getPropertyValue("port");
    if (protocolValue == null || protocolValue.getValue() == null) {
        throw new FatalBeanException("Attribute 'port' of <dubbo:protocol ... /> is null.");
    }

    String host = CommonUtils.getInetAddress();
    String port = String.valueOf(protocolValue.getValue());
    String identifier = String.format("%s:%s", host, port);

    for (int i = 0; i < beanDefList.size(); i++) {
        BeanDefinition beanDef = beanDefList.get(i);
        MutablePropertyValues mpv = beanDef.getPropertyValues();
        mpv.addPropertyValue(TransactionEndpointAware.ENDPOINT_FIELD_NAME, identifier);
    }

}

From source file:com.edgenius.wiki.render.impl.MacroManagerImpl.java

public void load() {
    ClassLoader classLoader = Macro.class.getClassLoader();

    BufferedReader is = null;/*from w  w  w .ja  v a 2s  .c o  m*/
    try {
        is = new BufferedReader(new InputStreamReader(classLoader.getResourceAsStream(macroResource)));
        String macroClz;
        while ((macroClz = is.readLine()) != null) {
            //get macro class
            if (StringUtils.isBlank(macroClz) || macroClz.trim().startsWith("#")) {
                //skip comment
                continue;
            }
            try {
                Object obj = classLoader.loadClass(macroClz.trim()).newInstance();
                if (obj instanceof Macro) {
                    Macro macro = (Macro) obj;
                    macro.init(applicationContext);
                    String[] names = macro.getName();
                    container.put(names, macro);
                    log.info("Macro class loading success:" + names[0]);
                    //put to containerIndex, so that macro can quick locate when try to get by name
                    for (String name : names) {
                        containerIndex.put(name.toLowerCase(), names);
                    }

                    if (obj instanceof ImmutableContentMacro) {
                        if (!macro.isPaired()) {
                            AuditLogger.error(
                                    "Unexpected case: ImmutableMacro is not paired macro, is that correct?"
                                            + Arrays.toString(macro.getName()));
                            throw new Exception(
                                    "Unexpected case: ImmutableMacro is not paired macro, is that correct?"
                                            + Arrays.toString(macro.getName()));
                        }
                        immutableContentMacroMap.add(macro);
                    }
                }
            } catch (Exception e) {
                log.error("Initial macro class " + macroClz + " failed. This macro is ignored!!!", e);
            }
        }
    } catch (IOException e) {
        log.error("Macro resource file " + macroResource + " not found.", e);
    } finally {
        IOUtils.closeQuietly(is);
    }

}

From source file:org.bytesoft.bytetcc.supports.spring.CompensableEndpointPostProcessor.java

public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
    ClassLoader cl = Thread.currentThread().getContextClassLoader();

    BeanDefinition protocolDef = null;//from   ww w. java 2 s  .c o  m

    List<BeanDefinition> beanDefList = new ArrayList<BeanDefinition>();
    String[] beanNameArray = beanFactory.getBeanDefinitionNames();
    for (int i = 0; i < beanNameArray.length; i++) {
        String beanName = beanNameArray[i];
        BeanDefinition beanDef = beanFactory.getBeanDefinition(beanName);
        String beanClassName = beanDef.getBeanClassName();

        Class<?> beanClass = null;
        try {
            beanClass = cl.loadClass(beanClassName);
        } catch (Exception ex) {
            logger.debug("Cannot load class {}, beanId= {}!", beanClassName, beanName, ex);
            continue;
        }

        if (CompensableEndpointAware.class.isAssignableFrom(beanClass)) {
            beanDefList.add(beanDef);
        } else if (ProtocolConfig.class.isAssignableFrom(beanClass)) {
            if (protocolDef == null) {
                protocolDef = beanDef;
            } else {
                throw new FatalBeanException(
                        "There are more than one com.alibaba.dubbo.config.ProtocolConfig was found!");
            }
        }
    }

    if (protocolDef == null) {
        throw new FatalBeanException(
                "No configuration of class com.alibaba.dubbo.config.ProtocolConfig was found.");
    }

    MutablePropertyValues protocolValues = protocolDef.getPropertyValues();
    PropertyValue protocolValue = protocolValues.getPropertyValue("port");
    if (protocolValue == null || protocolValue.getValue() == null) {
        throw new FatalBeanException("Attribute 'port' of <dubbo:protocol ... /> is null.");
    }

    String host = CommonUtils.getInetAddress();
    String port = String.valueOf(protocolValue.getValue());
    String identifier = String.format("%s:%s", host, port);

    for (int i = 0; i < beanDefList.size(); i++) {
        BeanDefinition beanDef = beanDefList.get(i);
        MutablePropertyValues mpv = beanDef.getPropertyValues();
        mpv.addPropertyValue(CompensableEndpointAware.ENDPOINT_FIELD_NAME, identifier);
    }

}

From source file:jfs.sync.JFSFileProducerManager.java

/**
 * Registers all factories and sets the default factory.
 *//* w ww . j  a va  2 s .  c o m*/
@SuppressWarnings("unchecked")
private JFSFileProducerManager() {
    factories = new HashMap<String, JFSFileProducerFactory>();
    Properties p = new Properties();
    ClassLoader classLoader = this.getClass().getClassLoader();
    try {
        p.load(classLoader.getResourceAsStream("producers.properties"));
    } catch (Exception e) {
        log.error("JFSFileProducerManager()", e);
    } // try/catch
    for (Object property : p.keySet()) {
        String className = "" + property;
        if (className.startsWith("jfs.sync.")) {
            if ("on".equals(p.getProperty(className))) {
                try {
                    Class<JFSFileProducerFactory> c = (Class<JFSFileProducerFactory>) classLoader
                            .loadClass(className);
                    Constructor<JFSFileProducerFactory> constructor = c.getConstructor(new Class<?>[0]);
                    JFSFileProducerFactory factory = constructor.newInstance(new Object[0]);
                    String name = factory.getName();
                    factories.put(name, factory);
                } catch (Exception e) {
                    log.error("JFSFileProducerManager()", e);
                } // try/catch
            } // if
        } // if
    } // for
    defaultFactory = factories.get(JFSLocalFileProducerFactory.SCHEME_NAME);
}

From source file:de.klemp.middleware.controller.Controller.java

/**
 * !!!! Important Method for creating new classes !!!! This method returns
 * the different classes of the first and second component. If a new class
 * is created, then it has to be added into this method. This method is
 * needed for the GUI. Method which use this method: getClassNames(...),
 * searchMethods(), getMethod()/*from   w w  w . jav a  2s. com*/
 * 
 * @param component
 *            1 or 2
 * @return ArrayList: list with objects of the classes
 */
private static ArrayList<Object> getClasses(String component) {
    // http://tutorials.jenkov.com/java-reflection/dynamic-class-loading-reloading.html
    // http://stackoverflow.com/questions/1456930/how-do-i-read-all-classes-from-a-java-package-in-the-classpath
    // http://www.dzone.com/snippets/get-all-classes-within-package
    ArrayList<Object> classes = new ArrayList<Object>();
    Enumeration<URL> urls;
    try {
        ClassLoader loader = Thread.currentThread().getContextClassLoader();
        urls = loader.getResources(component);
        while (urls.hasMoreElements()) {
            URL url = urls.nextElement();
            File file = new File(url.getFile());
            File[] files = file.listFiles();
            for (int i = 0; i < files.length; i++) {
                String[] f = files[i].getName().split("\\.");
                Class c;

                try {
                    c = loader.loadClass(component + "." + f[0]);
                    classes.add(c.newInstance());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException e) {
                    logger.error("Classes could not be refreshed", e);
                }

            }
        }
    } catch (IOException e) {
        logger.error("SQL Exception", e);
    }
    return classes;

}