com.sun.tools.javac.file: class: CloseableURLClassLoader

com.sun.tools.javac.file
class: CloseableURLClassLoader [javadoc | source]

java.lang.Object
   java.lang.ClassLoader
      java.security.SecureClassLoader
         java.net.URLClassLoader
            com.sun.tools.javac.file.CloseableURLClassLoader

All Implemented Interfaces:
Closeable

A URLClassLoader that also implements Closeable. Reflection is used to access internal data structures in the URLClassLoader, since no public API exists for this purpose. Therefore this code is somewhat fragile. Caveat emptor.

Throws:

Error - if the internal data structures are not as expected.

This is NOT part of any API supported by Sun Microsystems. If you write code that depends on this, you do so at your own risk. This code and its internal interfaces are subject to change or deletion without notice.

Fields inherited from java.net.URLClassLoader:
ucp

Fields inherited from java.lang.ClassLoader:
nocerts, classAssertionStatus

Constructor:
CloseableURLClassLoader(URL[] urls, ClassLoader parent) throws Error { super(urls, parent); try { getLoaders(); //proactive check that URLClassLoader is as expected } catch (Throwable t) { throw new Error("cannot create CloseableURLClassLoader", t); } }

Constructor:

 CloseableURLClassLoader(URL[] urls,
    ClassLoader parent) throws Error {
        super(urls, parent);
        try {
            getLoaders(); //proactive check that URLClassLoader is as expected
        } catch (Throwable t) {
            throw new Error("cannot create CloseableURLClassLoader", t);
        }
}

Method from com.sun.tools.javac.file.CloseableURLClassLoader Summary:
close

Methods from java.net.URLClassLoader:
access$000, access$100, addURL, definePackage, findClass, findResource, findResources, getPermissions, getURLs, newInstance, newInstance

Methods from java.security.SecureClassLoader:
defineClass, defineClass, getPermissions

Methods from java.lang.ClassLoader:
access$000, access$100, addClass, clearAssertionStatus, defineClass, defineClass, defineClass, defineClass, definePackage, desiredAssertionStatus, findClass, findLibrary, findLoadedClass, findNative, findResource, findResources, findSystemClass, getBootstrapClassPath, getCallerClassLoader, getPackage, getPackages, getParent, getResource, getResourceAsStream, getResources, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, isAncestor, loadClass, loadClass, loadLibrary, resolveClass, setClassAssertionStatus, setDefaultAssertionStatus, setPackageAssertionStatus, setSigners

Methods from java.lang.ClassLoader:

access$000, access$100, addClass, clearAssertionStatus, defineClass, defineClass, defineClass, defineClass, definePackage, desiredAssertionStatus, findClass, findLibrary, findLoadedClass, findNative, findResource, findResources, findSystemClass, getBootstrapClassPath, getCallerClassLoader, getPackage, getPackages, getParent, getResource, getResourceAsStream, getResources, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, isAncestor, loadClass, loadClass, loadLibrary, resolveClass, setClassAssertionStatus, setDefaultAssertionStatus, setPackageAssertionStatus, setSigners

Methods from java.lang.Object:
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method from com.sun.tools.javac.file.CloseableURLClassLoader Detail:
public void close() throws IOException { try { for (Object l: getLoaders()) { if (l.getClass().getName().equals("sun.misc.URLClassPath$JarLoader")) { Field jarField = l.getClass().getDeclaredField("jar"); JarFile jar = (JarFile) getField(l, jarField); if (jar != null) { //System.err.println("CloseableURLClassLoader: closing " + jar); jar.close(); } } } } catch (Throwable t) { IOException e = new IOException("cannot close class loader"); e.initCause(t); throw e; } } Close any jar files that may have been opened by the class loader. Reflection is used to access the jar files in the URLClassLoader's internal data structures.

Method from com.sun.tools.javac.file.CloseableURLClassLoader Detail:

 public  void close() throws IOException {
        try {
            for (Object l: getLoaders()) {
                if (l.getClass().getName().equals("sun.misc.URLClassPath$JarLoader")) {
                    Field jarField = l.getClass().getDeclaredField("jar");
                    JarFile jar = (JarFile) getField(l, jarField);
                    if (jar != null) {
                        //System.err.println("CloseableURLClassLoader: closing " + jar);
                        jar.close();
                    }
                }
            }
        } catch (Throwable t) {
            IOException e = new IOException("cannot close class loader");
            e.initCause(t);
            throw e;
        }
}

Close any jar files that may have been opened by the class loader. Reflection is used to access the jar files in the URLClassLoader's internal data structures.