private JarFile getCachedJarFile(URL url) { JarFile result = (JarFile) fileCache.get(url); /* if the JAR file is cached, the permission will always be there */ if (result != null) { Permission perm = getPermission(result); if (perm != null) { SecurityManager sm = System.getSecurityManager(); if (sm != null) { try { sm.checkPermission(perm); } catch (SecurityException se) { // fallback to checkRead/checkConnect for pre 1.2 // security managers if ((perm instanceof java.io.FilePermission) && perm.getActions().indexOf("read") != -1) { sm.checkRead(perm.getName()); } else if ((perm instanceof java.net.SocketPermission) && perm.getActions().indexOf("connect") != -1) { sm.checkConnect(url.getHost(), url.getPort()); } else { throw se; } } } } } return result; }