Example usage for java.lang Package isSealed

Introduction

In this page you can find the example usage for java.lang Package isSealed.

Prototype

public boolean isSealed() 

Source Link

Document

Returns true if this package is sealed.

Usage

From source file:Main.java

public static void main(String[] args) {

    // get the java lang package
    Package pack = Package.getPackage("java.lang");

    // check if this package is sealed
    System.out.println(pack.isSealed());

}

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From source file:com.github.wolf480pl.mias4j.core.runtime.BMClassLoader.java

protected Package copyPackage(Package pkg, CodeSource cs) {
    return definePackage(pkg.getName(), pkg.getSpecificationTitle(), pkg.getSpecificationVersion(),
            pkg.getSpecificationVendor(), pkg.getImplementationTitle(), pkg.getImplementationVersion(),
            pkg.getImplementationVendor(), pkg.isSealed() ? cs.getLocation() : null);
}

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From source file:com.seeburger.vfs2.util.VFSClassLoader.java

/**
 * Loads and verifies the class with name and located with res.
 *///from  w  w  w .  ja  va2 s .  c om
private Class<?> defineClass(final String name, final Resource res) throws IOException {
    final URL url = res.getCodeSourceURL();
    final String pkgName = res.getPackageName();
    if (pkgName != null) {
        final Package pkg = getPackage(pkgName);
        if (pkg != null) {
            if (pkg.isSealed()) {
                if (!pkg.isSealed(url)) {
                    throw new FileSystemException("vfs.impl/pkg-sealed-other-url", pkgName);
                }
            } else {
                if (isSealed(res)) {
                    throw new FileSystemException("vfs.impl/pkg-sealing-unsealed", pkgName);
                }
            }
        } else {
            definePackage(pkgName, res);
        }
    }

    final byte[] bytes = res.getBytes();
    final Certificate[] certs = res.getFileObject().getContent().getCertificates();
    final CodeSource cs = new CodeSource(url, certs);
    return defineClass(name, bytes, 0, bytes.length, cs);
}

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From source file:org.apache.catalina.loader.WebappClassLoader.java

/**
 * Find specified class in local repositories.
 *
 * @return the loaded class, or null if the class isn't found
 *//*from  ww w  . j a  v  a  2  s .com*/
protected Class findClassInternal(String name) throws ClassNotFoundException {

    if (!validate(name))
        throw new ClassNotFoundException(name);

    String tempPath = name.replace('.', '/');
    String classPath = tempPath + ".class";

    ResourceEntry entry = null;

    entry = findResourceInternal(name, classPath);

    if ((entry == null) || (entry.binaryContent == null))
        throw new ClassNotFoundException(name);

    Class clazz = entry.loadedClass;
    if (clazz != null)
        return clazz;

    // Looking up the package
    String packageName = null;
    int pos = name.lastIndexOf('.');
    if (pos != -1)
        packageName = name.substring(0, pos);

    Package pkg = null;

    if (packageName != null) {

        pkg = getPackage(packageName);

        // Define the package (if null)
        if (pkg == null) {
            if (entry.manifest == null) {
                definePackage(packageName, null, null, null, null, null, null, null);
            } else {
                definePackage(packageName, entry.manifest, entry.codeBase);
            }
        }

    }

    // Create the code source object
    CodeSource codeSource = new CodeSource(entry.codeBase, entry.certificates);

    if (securityManager != null) {

        // Checking sealing
        if (pkg != null) {
            boolean sealCheck = true;
            if (pkg.isSealed()) {
                sealCheck = pkg.isSealed(entry.codeBase);
            } else {
                sealCheck = (entry.manifest == null) || !isPackageSealed(packageName, entry.manifest);
            }
            if (!sealCheck)
                throw new SecurityException(
                        "Sealing violation loading " + name + " : Package " + packageName + " is sealed.");
        }

    }

    if (entry.loadedClass == null) {
        synchronized (this) {
            if (entry.loadedClass == null) {
                clazz = defineClass(name, entry.binaryContent, 0, entry.binaryContent.length, codeSource);
                entry.loadedClass = clazz;
                entry.binaryContent = null;
                entry.source = null;
                entry.codeBase = null;
                entry.manifest = null;
                entry.certificates = null;
            } else {
                clazz = entry.loadedClass;
            }
        }
    } else {
        clazz = entry.loadedClass;
    }

    return clazz;

}

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From source file:org.echocat.nodoodle.classloading.FileClassLoader.java

private Class<?> defineClass(String name, Resource resource) throws IOException {
    final int i = name.lastIndexOf('.');
    final URL packageUrl = resource.getPackageUrl();
    if (i != -1) {
        final String packageName = name.substring(0, i);
        // Check if package already loaded.
        final Package pkg = getPackage(packageName);
        final Manifest man = resource.getManifest();
        if (pkg != null) {
            // Package found, so check package sealing.
            if (pkg.isSealed()) {
                // Verify that code source URL is the same.
                if (!pkg.isSealed(packageUrl)) {
                    throw new SecurityException("sealing violation: package " + packageName + " is sealed");
                }//from w  ww.  j av a 2 s  . c o m
            } else {
                // Make sure we are not attempting to seal the package
                // at this code source URL.
                if ((man != null) && isSealed(packageName, man)) {
                    throw new SecurityException(
                            "sealing violation: can't seal package " + packageName + ": already loaded");
                }
            }
        } else {
            if (man != null) {
                definePackage(packageName, man, packageUrl);
            } else {
                definePackage(packageName, null, null, null, null, null, null, null);
            }
        }
    }
    final ByteArrayOutputStream baos = new ByteArrayOutputStream();
    final InputStream inputStream = resource.openStream();
    try {
        IOUtils.copy(inputStream, baos);
    } finally {
        IOUtils.closeQuietly(inputStream);
    }
    final byte[] bytes = baos.toByteArray();
    final CodeSigner[] signers = resource.getCodeSigners();
    final CodeSource cs = new CodeSource(packageUrl, signers);
    return defineClass(name, bytes, 0, bytes.length, new ProtectionDomain(cs, new Permissions()));
}

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