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:Main.java

public static void main(String[] argv) throws Exception {
    File file = new File("c:\\class\\");
    URL url = file.toURI().toURL();
    URL[] urls = new URL[] { url };
    ClassLoader loader = new URLClassLoader(urls);
    Class cls = loader.loadClass("user.informatin.Class");
}

From source file:Main.java

  public static void main(String[] argv) throws Exception {
  File file = new File("c:\\");

  URL url = file.toURI().toURL(); 
  URL[] urls = new URL[] { url };

  ClassLoader cl = new URLClassLoader(urls);

  Class cls = cl.loadClass("com.mycompany.MyClass");
}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    File file = new File("c:\\");

    URL url = file.toURI().toURL();
    URL[] urls = new URL[] { url };

    ClassLoader cl = new URLClassLoader(urls);

    Class cls = cl.loadClass("com.mycompany.MyClass");
}

From source file:MyClass.java

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

    URL[] urls = null;/*from  w  w w.  j a  v  a  2s.c  o m*/

    File dir = new File(System.getProperty("user.dir") + File.separator + "dir" + File.separator);
    URL url = dir.toURI().toURL();
    urls = new URL[] { url };

    ClassLoader cl = new URLClassLoader(urls);

    Class cls = cl.loadClass("MyClass");

    MyClass myObj = (MyClass) cls.newInstance();

}

From source file:Main.java

public static void main(String... args)
        throws ClassNotFoundException, NoSuchFieldException, IllegalAccessException, InterruptedException {
    URL url = Main.class.getProtectionDomain().getCodeSource().getLocation();
    final String className = Main.class.getPackage().getName() + ".UtilityClass";
    {// w  w  w.  j  a va2s . c  o m
        ClassLoader cl;
        Class clazz;

        for (int i = 0; i < 2; i++) {
            cl = new CustomClassLoader(url);
            clazz = cl.loadClass(className);
            loadClass(clazz);

            cl = new CustomClassLoader(url);
            clazz = cl.loadClass(className);
            loadClass(clazz);
            triggerGC();
        }
    }
    triggerGC();
}

From source file:Gen.java

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

    try {/*  w ww.  ja  v a 2  s.co m*/

        File[] files = null;
        if (System.getProperty("dir") != null && !System.getProperty("dir").equals("")) {
            files = new File(System.getProperty("dir")).listFiles(new FilenameFilter() {
                public boolean accept(File dir, String name) {
                    return name.toUpperCase().endsWith(".XML");
                };
            });
        } else {
            String fileName = System.getProperty("file") != null && !System.getProperty("file").equals("")
                    ? System.getProperty("file")
                    : "rjmap.xml";
            files = new File[] { new File(fileName) };
        }

        log.info("files : " + Arrays.toString(files));

        if (files == null || files.length == 0) {
            log.info("no files to parse");
            System.exit(0);
        }

        boolean formatsource = true;
        if (System.getProperty("formatsource") != null && !System.getProperty("formatsource").equals("")
                && System.getProperty("formatsource").equalsIgnoreCase("false")) {
            formatsource = false;
        }

        GEN_ROOT = System.getProperty("outputdir");

        if (GEN_ROOT == null || GEN_ROOT.equals("")) {
            GEN_ROOT = new File(files[0].getAbsolutePath()).getParent() + FILE_SEPARATOR + "distrib";
        }

        GEN_ROOT = new File(GEN_ROOT).getAbsolutePath().replace('\\', '/');
        if (GEN_ROOT.endsWith("/"))
            GEN_ROOT = GEN_ROOT.substring(0, GEN_ROOT.length() - 1);

        System.out.println("GEN ROOT:" + GEN_ROOT);

        MAPPING_JAR_NAME = System.getProperty("mappingjar") != null
                && !System.getProperty("mappingjar").equals("") ? System.getProperty("mappingjar")
                        : "mapping.jar";
        if (!MAPPING_JAR_NAME.endsWith(".jar"))
            MAPPING_JAR_NAME += ".jar";

        GEN_ROOT_SRC = GEN_ROOT + FILE_SEPARATOR + "src";
        GEN_ROOT_LIB = GEN_ROOT + FILE_SEPARATOR + "";

        DocumentBuilderFactory domFactory = DocumentBuilderFactory.newInstance();
        domFactory.setNamespaceAware(true);
        domFactory.setValidating(false);
        DocumentBuilder documentBuilder = domFactory.newDocumentBuilder();

        for (int f = 0; f < files.length; ++f) {
            log.info("parsing file : " + files[f]);
            Document document = documentBuilder.parse(files[f]);

            Vector<Node> initNodes = new Vector<Node>();
            Utils.catchNodes(Utils.catchNode(document.getDocumentElement(), "scripts"), "initScript",
                    initNodes);
            for (int i = 0; i < initNodes.size(); ++i) {
                NamedNodeMap attrs = initNodes.elementAt(i).getAttributes();
                boolean embed = attrs.getNamedItem("embed") != null
                        && attrs.getNamedItem("embed").getNodeValue().equalsIgnoreCase("true");
                StringBuffer vbuffer = new StringBuffer();
                if (attrs.getNamedItem("inline") != null) {
                    vbuffer.append(attrs.getNamedItem("inline").getNodeValue());
                    vbuffer.append('\n');
                } else {
                    String fname = attrs.getNamedItem("name").getNodeValue();
                    if (!fname.startsWith("\\") && !fname.startsWith("/") && fname.toCharArray()[1] != ':') {
                        String path = files[f].getAbsolutePath();
                        path = path.substring(0, path.lastIndexOf(FILE_SEPARATOR));
                        fname = new File(path + FILE_SEPARATOR + fname).getCanonicalPath();
                    }
                    vbuffer.append(Utils.getFileAsStringBuffer(fname));
                }
                initScriptBuffer.append(vbuffer);
                if (embed)
                    embedScriptBuffer.append(vbuffer);
            }

            Vector<Node> packageInitNodes = new Vector<Node>();
            Utils.catchNodes(Utils.catchNode(document.getDocumentElement(), "scripts"), "packageScript",
                    packageInitNodes);
            for (int i = 0; i < packageInitNodes.size(); ++i) {
                NamedNodeMap attrs = packageInitNodes.elementAt(i).getAttributes();
                String packageName = attrs.getNamedItem("package").getNodeValue();

                if (packageName.equals(""))
                    packageName = "rGlobalEnv";

                if (!packageName.endsWith("Function"))
                    packageName += "Function";
                if (packageEmbedScriptHashMap.get(packageName) == null) {
                    packageEmbedScriptHashMap.put(packageName, new StringBuffer());
                }
                StringBuffer vbuffer = packageEmbedScriptHashMap.get(packageName);

                // if (!packageName.equals("rGlobalEnvFunction")) {
                // vbuffer.append("library("+packageName.substring(0,packageName.lastIndexOf("Function"))+")\n");
                // }

                if (attrs.getNamedItem("inline") != null) {
                    vbuffer.append(attrs.getNamedItem("inline").getNodeValue() + "\n");
                    initScriptBuffer.append(attrs.getNamedItem("inline").getNodeValue() + "\n");
                } else {
                    String fname = attrs.getNamedItem("name").getNodeValue();
                    if (!fname.startsWith("\\") && !fname.startsWith("/") && fname.toCharArray()[1] != ':') {
                        String path = files[f].getAbsolutePath();
                        path = path.substring(0, path.lastIndexOf(FILE_SEPARATOR));
                        fname = new File(path + FILE_SEPARATOR + fname).getCanonicalPath();
                    }
                    StringBuffer fileBuffer = Utils.getFileAsStringBuffer(fname);
                    vbuffer.append(fileBuffer);
                    initScriptBuffer.append(fileBuffer);
                }
            }

            Vector<Node> functionsNodes = new Vector<Node>();
            Utils.catchNodes(Utils.catchNode(document.getDocumentElement(), "functions"), "function",
                    functionsNodes);
            for (int i = 0; i < functionsNodes.size(); ++i) {
                NamedNodeMap attrs = functionsNodes.elementAt(i).getAttributes();
                String functionName = attrs.getNamedItem("name").getNodeValue();

                boolean forWeb = attrs.getNamedItem("forWeb") != null
                        && attrs.getNamedItem("forWeb").getNodeValue().equalsIgnoreCase("true");

                String signature = (attrs.getNamedItem("signature") == null ? ""
                        : attrs.getNamedItem("signature").getNodeValue() + ",");
                String renameTo = (attrs.getNamedItem("renameTo") == null ? null
                        : attrs.getNamedItem("renameTo").getNodeValue());

                HashMap<String, FAttributes> sigMap = Globals._functionsToPublish.get(functionName);

                if (sigMap == null) {
                    sigMap = new HashMap<String, FAttributes>();
                    Globals._functionsToPublish.put(functionName, sigMap);

                    if (attrs.getNamedItem("returnType") == null) {
                        _functionsVector.add(new String[] { functionName });
                    } else {
                        _functionsVector.add(
                                new String[] { functionName, attrs.getNamedItem("returnType").getNodeValue() });
                    }

                }

                sigMap.put(signature, new FAttributes(renameTo, forWeb));

                if (forWeb)
                    _webPublishingEnabled = true;

            }

            if (System.getProperty("targetjdk") != null && !System.getProperty("targetjdk").equals("")
                    && System.getProperty("targetjdk").compareTo("1.5") < 0) {
                if (_webPublishingEnabled || (System.getProperty("ws.r.api") != null
                        && System.getProperty("ws.r.api").equalsIgnoreCase("true"))) {
                    log.info("be careful, web publishing disabled beacuse target JDK<1.5");
                }
                _webPublishingEnabled = false;
            } else {

                if (System.getProperty("ws.r.api") == null || System.getProperty("ws.r.api").equals("")
                        || !System.getProperty("ws.r.api").equalsIgnoreCase("false")) {
                    _webPublishingEnabled = true;
                }

                if (_webPublishingEnabled && System.getProperty("java.version").compareTo("1.5") < 0) {
                    log.info("be careful, web publishing disabled beacuse a JDK<1.5 is in use");
                    _webPublishingEnabled = false;
                }
            }

            Vector<Node> s4Nodes = new Vector<Node>();
            Utils.catchNodes(Utils.catchNode(document.getDocumentElement(), "s4classes"), "class", s4Nodes);

            if (s4Nodes.size() > 0) {
                String formalArgs = "";
                String signature = "";
                for (int i = 0; i < s4Nodes.size(); ++i) {
                    NamedNodeMap attrs = s4Nodes.elementAt(i).getAttributes();
                    String s4Name = attrs.getNamedItem("name").getNodeValue();
                    formalArgs += "p" + i + (i == s4Nodes.size() - 1 ? "" : ",");
                    signature += "'" + s4Name + "'" + (i == s4Nodes.size() - 1 ? "" : ",");
                }
                String genBeansScriptlet = "setGeneric('" + PUBLISH_S4_HEADER + "', function(" + formalArgs
                        + ") standardGeneric('" + PUBLISH_S4_HEADER + "'));" + "setMethod('" + PUBLISH_S4_HEADER
                        + "', signature(" + signature + ") , function(" + formalArgs + ") {   })";
                initScriptBuffer.append(genBeansScriptlet);
                _functionsVector.add(new String[] { PUBLISH_S4_HEADER, "numeric" });
            }

        }

        if (!new File(GEN_ROOT_LIB).exists())
            regenerateDir(GEN_ROOT_LIB);
        else {
            clean(GEN_ROOT_LIB, true);
        }

        for (int i = 0; i < rwebservicesScripts.length; ++i)
            DirectJNI.getInstance().getRServices().sourceFromResource(rwebservicesScripts[i]);

        String lastStatus = DirectJNI.getInstance().runR(new ExecutionUnit() {
            public void run(Rengine e) {
                DirectJNI.getInstance().toggleMarker();
                DirectJNI.getInstance().sourceFromBuffer(initScriptBuffer.toString());
                log.info(" init  script status : " + DirectJNI.getInstance().cutStatusSinceMarker());

                for (int i = 0; i < _functionsVector.size(); ++i) {

                    String[] functionPair = _functionsVector.elementAt(i);
                    log.info("dealing with : " + functionPair[0]);

                    regenerateDir(GEN_ROOT_SRC);

                    String createMapStr = "createMap(";
                    boolean isGeneric = e.rniGetBoolArrayI(
                            e.rniEval(e.rniParse("isGeneric(\"" + functionPair[0] + "\")", 1), 0))[0] == 1;

                    log.info("is Generic : " + isGeneric);
                    if (isGeneric) {
                        createMapStr += functionPair[0];
                    } else {
                        createMapStr += "\"" + functionPair[0] + "\"";
                    }
                    createMapStr += ", outputDirectory=\"" + GEN_ROOT_SRC
                            .substring(0, GEN_ROOT_SRC.length() - "/src".length()).replace('\\', '/') + "\"";
                    createMapStr += ", typeMode=\"robject\"";
                    createMapStr += (functionPair.length == 1 || functionPair[1] == null
                            || functionPair[1].trim().equals("") ? ""
                                    : ", S4DefaultTypedSig=TypedSignature(returnType=\"" + functionPair[1]
                                            + "\")");
                    createMapStr += ")";

                    log.info("------------------------------------------");
                    log.info("-- createMapStr=" + createMapStr);
                    DirectJNI.getInstance().toggleMarker();
                    e.rniEval(e.rniParse(createMapStr, 1), 0);
                    String createMapStatus = DirectJNI.getInstance().cutStatusSinceMarker();
                    log.info(" createMap status : " + createMapStatus);
                    log.info("------------------------------------------");

                    deleteDir(GEN_ROOT_SRC + "/org/kchine/r/rserviceJms");
                    compile(GEN_ROOT_SRC);
                    jar(GEN_ROOT_SRC, GEN_ROOT_LIB + FILE_SEPARATOR + TEMP_JARS_PREFIX + i + ".jar", null);

                    URL url = null;
                    try {
                        url = new URL(
                                "jar:file:" + (GEN_ROOT_LIB + FILE_SEPARATOR + TEMP_JARS_PREFIX + i + ".jar")
                                        .replace('\\', '/') + "!/");
                    } catch (Exception ex) {
                        ex.printStackTrace();
                    }
                    DirectJNI.generateMaps(url, true);
                }

            }
        });

        log.info(lastStatus);

        log.info(DirectJNI._rPackageInterfacesHash);
        regenerateDir(GEN_ROOT_SRC);
        for (int i = 0; i < _functionsVector.size(); ++i) {
            unjar(GEN_ROOT_LIB + FILE_SEPARATOR + TEMP_JARS_PREFIX + i + ".jar", GEN_ROOT_SRC);
        }

        regenerateRPackageClass(true);

        generateS4BeanRef();

        if (formatsource)
            applyJalopy(GEN_ROOT_SRC);

        compile(GEN_ROOT_SRC);

        for (String k : DirectJNI._rPackageInterfacesHash.keySet()) {
            Rmic rmicTask = new Rmic();
            rmicTask.setProject(_project);
            rmicTask.setTaskName("rmic_packages");
            rmicTask.setClasspath(new Path(_project, GEN_ROOT_SRC));
            rmicTask.setBase(new File(GEN_ROOT_SRC));
            rmicTask.setClassname(k + "ImplRemote");
            rmicTask.init();
            rmicTask.execute();
        }

        // DirectJNI._rPackageInterfacesHash=new HashMap<String,
        // Vector<Class<?>>>();
        // DirectJNI._rPackageInterfacesHash.put("org.bioconductor.packages.rGlobalEnv.rGlobalEnvFunction",new
        // Vector<Class<?>>());

        if (_webPublishingEnabled) {

            jar(GEN_ROOT_SRC, GEN_ROOT_LIB + FILE_SEPARATOR + "__temp.jar", null);
            URL url = new URL(
                    "jar:file:" + (GEN_ROOT_LIB + FILE_SEPARATOR + "__temp.jar").replace('\\', '/') + "!/");
            ClassLoader cl = new URLClassLoader(new URL[] { url }, Globals.class.getClassLoader());

            for (String className : DirectJNI._rPackageInterfacesHash.keySet()) {
                if (cl.loadClass(className + "Web").getDeclaredMethods().length == 0)
                    continue;
                log.info("######## " + className);

                WsGen wsgenTask = new WsGen();
                wsgenTask.setProject(_project);
                wsgenTask.setTaskName("wsgen");

                FileSet rjb_fileSet = new FileSet();
                rjb_fileSet.setProject(_project);
                rjb_fileSet.setDir(new File("."));
                rjb_fileSet.setIncludes("RJB.jar");

                DirSet src_dirSet = new DirSet();
                src_dirSet.setDir(new File(GEN_ROOT_LIB + FILE_SEPARATOR + "src/"));
                Path classPath = new Path(_project);
                classPath.addFileset(rjb_fileSet);
                classPath.addDirset(src_dirSet);
                wsgenTask.setClasspath(classPath);
                wsgenTask.setKeep(true);
                wsgenTask.setDestdir(new File(GEN_ROOT_LIB + FILE_SEPARATOR + "src/"));
                wsgenTask.setResourcedestdir(new File(GEN_ROOT_LIB + FILE_SEPARATOR + "src/"));
                wsgenTask.setSei(className + "Web");

                wsgenTask.init();
                wsgenTask.execute();
            }

            new File(GEN_ROOT_LIB + FILE_SEPARATOR + "__temp.jar").delete();

        }

        embedRScripts();

        HashMap<String, String> marker = new HashMap<String, String>();
        marker.put("RJBMAPPINGJAR", "TRUE");

        Properties props = new Properties();
        props.put("PACKAGE_NAMES", PoolUtils.objectToHex(DirectJNI._packageNames));
        props.put("S4BEANS_MAP", PoolUtils.objectToHex(DirectJNI._s4BeansMapping));
        props.put("S4BEANS_REVERT_MAP", PoolUtils.objectToHex(DirectJNI._s4BeansMappingRevert));
        props.put("FACTORIES_MAPPING", PoolUtils.objectToHex(DirectJNI._factoriesMapping));
        props.put("S4BEANS_HASH", PoolUtils.objectToHex(DirectJNI._s4BeansHash));
        props.put("R_PACKAGE_INTERFACES_HASH", PoolUtils.objectToHex(DirectJNI._rPackageInterfacesHash));
        props.put("ABSTRACT_FACTORIES", PoolUtils.objectToHex(DirectJNI._abstractFactories));
        new File(GEN_ROOT_SRC + "/" + "maps").mkdirs();
        FileOutputStream fos = new FileOutputStream(GEN_ROOT_SRC + "/" + "maps/rjbmaps.xml");
        props.storeToXML(fos, null);
        fos.close();

        jar(GEN_ROOT_SRC, GEN_ROOT_LIB + FILE_SEPARATOR + MAPPING_JAR_NAME, marker);

        if (_webPublishingEnabled)
            genWeb();

        DirectJNI._mappingClassLoader = null;

    } finally {

        System.exit(0);

    }
}

From source file:Main.java

public static Class<?> loadClassNoThrow(ClassLoader loader, String name) {
    try {/*from  ww  w  . j  a  va  2 s .  c om*/
        return loader.loadClass(name);
    } catch (ClassNotFoundException e) {
        return null;
    }
}

From source file:Main.java

public static Class forClassName(ClassLoader classLoader, String className) {
    try {//  ww  w. ja  va 2s. c om
        return classLoader.loadClass(className);
    } catch (ClassNotFoundException e) {
        e.printStackTrace();
        return null;
    }
}

From source file:PackageInfo.java

static void pkgInfo(ClassLoader classLoader, String pkgName, String className) {

    try {//from w ww . j av a  2s .  c om
        classLoader.loadClass(pkgName + "." + className);

        Package p = Package.getPackage(pkgName);
        if (p == null) {
            System.out.println("WARNING: Package.getPackage(" + pkgName + ") is null");
        } else {
            System.out.println(p);
            System.out.println("Specification Title = " + p.getSpecificationTitle());
            System.out.println("Specification Vendor = " + p.getSpecificationVendor());
            System.out.println("Specification Version = " + p.getSpecificationVersion());

            System.out.println("Implementation Vendor = " + p.getImplementationVendor());
            System.out.println("Implementation Version = " + p.getImplementationVersion());
        }
    } catch (ClassNotFoundException e) {
        System.out.println("Unable to load " + pkgName);
    }

    System.out.println();
}

From source file:Main.java

private static String getSystemProperty(String key, String def) {
    try {/*from   w w w  . j  a  va2s .  c o  m*/
        final ClassLoader cl = ClassLoader.getSystemClassLoader();
        final Class<?> SystemProperties = cl.loadClass("android.os.SystemProperties");
        final Class<?>[] paramTypes = new Class[] { String.class, String.class };
        final Method get = SystemProperties.getMethod("get", paramTypes);
        final Object[] params = new Object[] { key, def };
        return (String) get.invoke(SystemProperties, params);
    } catch (Exception e) {
        return def;
    }
}