Creating new instances of java.lang.Boolean wastes memory, since Boolean objects are immutable and there are only two useful values of this type. Use the Boolean.valueOf() method to create Boolean objects instead.

$ pwd
/local-copy/1.6.0-rc-b69_src/j2se/src/share/classes/java/lang
$ tail +1685 ClassLoader.java | head -7
    private static boolean loadLibrary0(Class fromClass, final File file) {
        Boolean exists = (Boolean)
            AccessController.doPrivileged(new PrivilegedAction() {
                public Object run() {
                    return new Boolean(file.exists()); // <---- here
                }
            });