Attachment 115044 Details for Bug 190279 – URLClassLoader closer

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URLClassLoader closer

URLClassLoaderCloser.java (text/plain), 2.32 KB, created by Thomas Watson

on 2008-10-14 11:01:58 EDT

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Filename:

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Creator: Thomas Watson

Created: 2008-10-14 11:01:58 EDT

Size: 2.32 KB

patch

obsolete

>package test.jared;
>
>import java.lang.reflect.Field;
>import java.lang.reflect.Method;
>import java.net.URL;
>import java.net.URLClassLoader;
>import java.util.Iterator;
>import java.util.Map;
>import java.util.zip.ZipFile;
>
>public class URLClassLoaderCloser {
>
>	public  static void closeLoader(URLClassLoader cl) {
>		URL[] urls = cl.getURLs();
>		Field ucpField;
>		try {
>			ucpField = URLClassLoader.class.getDeclaredField("ucp");
>			ucpField.setAccessible(true);
>		} catch (NoSuchFieldException e) {
>			// fail silently
>			return;
>		}
>		ucpField.setAccessible(true);
>		Object ucp;
>		try {
>			ucp = ucpField.get(cl);
>		} catch (IllegalAccessException e) {
>			// fail silently
>			return;
>		}
>		Method getLoader;
>		try {
>			getLoader = ucp.getClass().getDeclaredMethod("getLoader", new Class[] {URL.class});
>		} catch (NoSuchMethodException e) {
>			// fail silently
>			return;
>		}
>		getLoader.setAccessible(true);
>		Field jarField = null;
>		Field lmapField = null;
>		for (int i = 0; i < urls.length; i++) {
>			Object loader;
>			try {
>				loader = getLoader.invoke(ucp, new Object[] {urls[i]});
>			} catch (Exception e) {
>				// continue to next loader
>				continue;
>			}
>			if (jarField == null) {
>				try {
>					jarField = loader.getClass().getDeclaredField("jar");
>					jarField.setAccessible(true);
>				} catch (Exception e) {
>					//continue to next loader
>					continue;
>				}
>			}
>			if (jarField != null) {
>				ZipFile zipFile;
>				try {
>					zipFile = (ZipFile) jarField.get(loader);
>					zipFile.close();
>				} catch (Exception e) {
>					// continue to lmap field
>				}
>			}
>			if (lmapField == null) {
>				try {
>					lmapField = loader.getClass().getDeclaredField("lmap");
>					lmapField.setAccessible(true);
>				} catch (Exception e) {
>					continue;
>				}
>			}
>			if (lmapField != null) {
>				try {
>					Map lmap = (Map) lmapField.get(loader);
>					for (Iterator iLoaders = lmap.values().iterator(); iLoaders.hasNext();) {
>						Object innerLoader = iLoaders.next();
>						if (jarField != null) {
>							try {
>							ZipFile zipFile = (ZipFile) jarField.get(innerLoader);
>							zipFile.close();
>							} catch (Exception e) {
>								//continue to next loader in lmap
>								continue;
>							}
>						}
>					}
>				} catch (Exception e) {
>					continue;
>				} 
>			}
>		}
>	}
>
>}

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Attachments on bug 190279: 69566 | 115044 | 115535 | 115574 | 115926