Are you suffering from using Dojo in Grails ?

Everything works fine for Grails 0.3.1 when I'm not using Dojo.
But after I'm using it with Grails, I'm suffering from the 100% CPU usage.
This performance hit's caused by Jetty (Grails' default server) is trying to response Dojo files.

From my understanding, it might be that
1. Jetty in Grails distribution has not been configured for this purpose ? or
2. It's normal that a Servlet container's not good at serving a big static file ?

Anyway, I still don't know what's going on inside the container, but I've got a workaround for this problem.
My current solution is to use lighttpd as the front server to serve this Dojo monster ;)
I connect lighttpd with Grails' server using the mod_proxy.
Here's my current config in \etc\lighttpd.conf

proxy.server = ( "/" =>
( "127.0.0.1" =>
(
"host" => "127.0.0.1",
"port" => 8080
)
)
)

Then you need to put your Dojo files into the \htdocs, and correct all script's references in your GSP pages.
Lighttpd uses the default 80 port. So, you just point your browser to http://127.0.0.1//, every should work correctly.

IMO, this solution should work for the production phase as well.

Minimum "rt.jar" for Hello World

Here's a list of classes that are needed to run a Java hello world program.
I find this list using java -verbose (motivated by this post).

== listfile.txt ==
/java/io/BufferedInputStream.class
/java/io/BufferedOutputStream.class
/java/io/BufferedWriter.class
/java/io/Closeable.class
/java/io/DataInput.class
/java/io/DataInputStream.class
/java/io/ExpiringCache.class
/java/io/ExpiringCache$1.class
/java/io/ExpiringCache$Entry.class
/java/io/File.class
/java/io/FileDescriptor.class
/java/io/FileInputStream.class
/java/io/FileOutputStream.class
/java/io/FilePermission.class
/java/io/FilePermission$1.class
/java/io/FilePermissionCollection.class
/java/io/FileSystem.class
/java/io/FilterInputStream.class
/java/io/FilterOutputStream.class
/java/io/Flushable.class
/java/io/InputStream.class
/java/io/ObjectStreamClass.class
/java/io/ObjectStreamField.class
/java/io/OutputStream.class
/java/io/OutputStreamWriter.class
/java/io/PrintStream.class
/java/io/Serializable.class
/java/io/Win32FileSystem.class
/java/io/WinNTFileSystem.class
/java/io/Writer.class
/java/lang/AbstractStringBuilder.class
/java/lang/Appendable.class
/java/lang/ArithmeticException.class
/java/lang/ArrayStoreException.class
/java/lang/Boolean.class
/java/lang/Byte.class
/java/lang/CharSequence.class
/java/lang/Character.class
/java/lang/CharacterDataLatin1.class
/java/lang/Class.class
/java/lang/Class$1.class
/java/lang/Class$3.class
/java/lang/ClassCastException.class
/java/lang/ClassLoader.class
/java/lang/ClassLoader$3.class
/java/lang/ClassLoader$NativeLibrary.class
/java/lang/ClassNotFoundException.class
/java/lang/Cloneable.class
/java/lang/Comparable.class
/java/lang/Compiler.class
/java/lang/Compiler$1.class
/java/lang/Double.class
/java/lang/Error.class
/java/lang/Exception.class
/java/lang/Float.class
/java/lang/IncompatibleClassChangeError.class
/java/lang/Integer.class
/java/lang/Iterable.class
/java/lang/LinkageError.class
/java/lang/Long.class
/java/lang/Math.class
/java/lang/NoClassDefFoundError.class
/java/lang/NoSuchMethodError.class
/java/lang/NullPointerException.class
/java/lang/Number.class
/java/lang/Object.class
/java/lang/OutOfMemoryError.class
/java/lang/Readable.class
/java/lang/Runnable.class
/java/lang/Runtime.class
/java/lang/RuntimeException.class
/java/lang/RuntimePermission.class
/java/lang/Short.class
/java/lang/Shutdown.class
/java/lang/Shutdown$Lock.class
/java/lang/StackOverflowError.class
/java/lang/StackTraceElement.class
/java/lang/StrictMath.class
/java/lang/String.class
/java/lang/String$CaseInsensitiveComparator.class
/java/lang/StringBuffer.class
/java/lang/StringBuilder.class
/java/lang/StringCoding.class
/java/lang/StringCoding$CharsetSD.class
/java/lang/StringCoding$CharsetSE.class
/java/lang/StringCoding$StringDecoder.class
/java/lang/StringCoding$StringEncoder.class
/java/lang/System.class
/java/lang/System$2.class
/java/lang/SystemClassLoaderAction.class
/java/lang/Terminator.class
/java/lang/Terminator$1.class
/java/lang/Thread.class
/java/lang/Thread$UncaughtExceptionHandler.class
/java/lang/ThreadDeath.class
/java/lang/ThreadGroup.class
/java/lang/ThreadLocal.class
/java/lang/ThreadLocal$ThreadLocalMap.class
/java/lang/ThreadLocal$ThreadLocalMap$Entry.class
/java/lang/Throwable.class
/java/lang/VirtualMachineError.class
/java/lang/annotation/Annotation.class
/java/lang/management/MemoryUsage.class
/java/lang/ref/FinalReference.class
/java/lang/ref/Finalizer.class
/java/lang/ref/Finalizer$FinalizerThread.class
/java/lang/ref/PhantomReference.class
/java/lang/ref/Reference.class
/java/lang/ref/Reference$Lock.class
/java/lang/ref/Reference$ReferenceHandler.class
/java/lang/ref/ReferenceQueue.class
/java/lang/ref/ReferenceQueue$Lock.class
/java/lang/ref/ReferenceQueue$Null.class
/java/lang/ref/SoftReference.class
/java/lang/ref/WeakReference.class
/java/lang/reflect/AccessibleObject.class
/java/lang/reflect/AnnotatedElement.class
/java/lang/reflect/Constructor.class
/java/lang/reflect/Field.class
/java/lang/reflect/GenericDeclaration.class
/java/lang/reflect/Member.class
/java/lang/reflect/Method.class
/java/lang/reflect/Modifier.class
/java/lang/reflect/ReflectAccess.class
/java/lang/reflect/ReflectPermission.class
/java/lang/reflect/Type.class
/java/net/ContentHandler.class
/java/net/Parts.class
/java/net/URL.class
/java/net/URLClassLoader.class
/java/net/URLClassLoader$1.class
/java/net/URLConnection.class
/java/net/URLStreamHandler.class
/java/net/URLStreamHandlerFactory.class
/java/net/UnknownContentHandler.class
/java/nio/Bits.class
/java/nio/Buffer.class
/java/nio/ByteBuffer.class
/java/nio/ByteOrder.class
/java/nio/CharBuffer.class
/java/nio/HeapByteBuffer.class
/java/nio/HeapCharBuffer.class
/java/nio/charset/Charset.class
/java/nio/charset/Charset$3.class
/java/nio/charset/CharsetDecoder.class
/java/nio/charset/CharsetEncoder.class
/java/nio/charset/CoderResult.class
/java/nio/charset/CoderResult$1.class
/java/nio/charset/CoderResult$2.class
/java/nio/charset/CoderResult$Cache.class
/java/nio/charset/CodingErrorAction.class
/java/nio/charset/spi/CharsetProvider.class
/java/security/AccessControlContext.class
/java/security/AccessController.class
/java/security/AllPermission.class
/java/security/BasicPermission.class
/java/security/BasicPermissionCollection.class
/java/security/CodeSource.class
/java/security/Guard.class
/java/security/Permission.class
/java/security/PermissionCollection.class
/java/security/Permissions.class
/java/security/Principal.class
/java/security/PrivilegedAction.class
/java/security/PrivilegedActionException.class
/java/security/PrivilegedExceptionAction.class
/java/security/ProtectionDomain.class
/java/security/SecureClassLoader.class
/java/security/UnresolvedPermission.class
/java/security/cert/Certificate.class
/java/util/AbstractCollection.class
/java/util/AbstractList.class
/java/util/AbstractMap.class
/java/util/AbstractSet.class
/java/util/ArrayList.class
/java/util/BitSet.class
/java/util/Collection.class
/java/util/Collections.class
/java/util/Collections$EmptyList.class
/java/util/Collections$EmptyMap.class
/java/util/Collections$EmptySet.class
/java/util/Collections$ReverseComparator.class
/java/util/Collections$SynchronizedMap.class
/java/util/Comparator.class
/java/util/Dictionary.class
/java/util/Enumeration.class
/java/util/HashMap.class
/java/util/HashMap$Entry.class
/java/util/HashSet.class
/java/util/Hashtable.class
/java/util/Hashtable$EmptyEnumerator.class
/java/util/Hashtable$EmptyIterator.class
/java/util/Hashtable$Entry.class
/java/util/Iterator.class
/java/util/LinkedHashMap.class
/java/util/LinkedHashMap$Entry.class
/java/util/List.class
/java/util/Locale.class
/java/util/Map.class
/java/util/Map$Entry.class
/java/util/Properties.class
/java/util/Random.class
/java/util/RandomAccess.class
/java/util/Set.class
/java/util/SortedMap.class
/java/util/Stack.class
/java/util/StringTokenizer.class
/java/util/TreeMap.class
/java/util/TreeMap$Entry.class
/java/util/Vector.class
/java/util/concurrent/atomic/AtomicLong.class
/java/util/concurrent/atomic/AtomicReferenceFieldUpdater.class
/java/util/concurrent/atomic/AtomicReferenceFieldUpdater$AtomicReferenceFieldUpdaterImpl.class
/java/util/jar/JarEntry.class
/java/util/jar/JarFile.class
/java/util/jar/JarFile$JarFileEntry.class
/java/util/jar/JavaUtilJarAccessImpl.class
/java/util/zip/Inflater.class
/java/util/zip/InflaterInputStream.class
/java/util/zip/ZipConstants.class
/java/util/zip/ZipEntry.class
/java/util/zip/ZipFile.class
/java/util/zip/ZipFile$2.class
/java/util/zip/ZipFile$ZipFileInputStream.class
/sun/io/Converters.class
/sun/misc/ASCIICaseInsensitiveComparator.class
/sun/misc/AtomicLong.class
/sun/misc/AtomicLongCSImpl.class
/sun/misc/ExtensionDependency.class
/sun/misc/FileURLMapper.class
/sun/misc/JarIndex.class
/sun/misc/JavaLangAccess.class
/sun/misc/JavaUtilJarAccess.class
/sun/misc/Launcher.class
/sun/misc/Launcher$AppClassLoader.class
/sun/misc/Launcher$AppClassLoader$1.class
/sun/misc/Launcher$ExtClassLoader.class
/sun/misc/Launcher$ExtClassLoader$1.class
/sun/misc/Launcher$Factory.class
/sun/misc/NativeSignalHandler.class
/sun/misc/Resource.class
/sun/misc/SharedSecrets.class
/sun/misc/Signal.class
/sun/misc/SignalHandler.class
/sun/misc/SoftCache.class
/sun/misc/URLClassPath.class
/sun/misc/URLClassPath$3.class
/sun/misc/URLClassPath$FileLoader.class
/sun/misc/URLClassPath$FileLoader$1.class
/sun/misc/URLClassPath$JarLoader.class
/sun/misc/URLClassPath$Loader.class
/sun/misc/Unsafe.class
/sun/misc/VM.class
/sun/misc/Version.class
/sun/net/www/MessageHeader.class
/sun/net/www/ParseUtil.class
/sun/net/www/URLConnection.class
/sun/net/www/protocol/file/FileURLConnection.class
/sun/net/www/protocol/file/Handler.class
/sun/net/www/protocol/jar/Handler.class
/sun/nio/ByteBuffered.class
/sun/nio/cs/AbstractCharsetProvider.class
/sun/nio/cs/FastCharsetProvider.class
/sun/nio/cs/HistoricallyNamedCharset.class
/sun/nio/cs/MS1252.class
/sun/nio/cs/MS1252$Decoder.class
/sun/nio/cs/MS1252$Encoder.class
/sun/nio/cs/SingleByteDecoder.class
/sun/nio/cs/SingleByteEncoder.class
/sun/nio/cs/StandardCharsets.class
/sun/nio/cs/StandardCharsets$Aliases.class
/sun/nio/cs/StandardCharsets$Cache.class
/sun/nio/cs/StandardCharsets$Classes.class
/sun/nio/cs/StreamEncoder.class
/sun/nio/cs/StreamEncoder$CharsetSE.class
/sun/nio/cs/Surrogate.class
/sun/nio/cs/Surrogate$Parser.class
/sun/nio/cs/ext/ExtendedCharsets.class
/sun/nio/cs/ext/MS874.class
/sun/nio/cs/ext/MS874$Decoder.class
/sun/nio/cs/ext/MS874$Encoder.class
/sun/reflect/ConstantPool.class
/sun/reflect/ConstructorAccessor.class
/sun/reflect/ConstructorAccessorImpl.class
/sun/reflect/DelegatingClassLoader.class
/sun/reflect/DelegatingConstructorAccessorImpl.class
/sun/reflect/LangReflectAccess.class
/sun/reflect/MagicAccessorImpl.class
/sun/reflect/MethodAccessor.class
/sun/reflect/MethodAccessorImpl.class
/sun/reflect/NativeConstructorAccessorImpl.class
/sun/reflect/Reflection.class
/sun/reflect/ReflectionFactory.class
/sun/reflect/ReflectionFactory$1.class
/sun/reflect/ReflectionFactory$GetReflectionFactoryAction.class
/sun/reflect/misc/ReflectUtil.class
/sun/security/action/GetPropertyAction.class
/sun/security/util/Debug.class
/sun/util/PreHashedMap.class

The following is a command for 7z to strip down the rt.jar (from 37,043 Kb to 1,806 Kb).

7z.exe d -r -x@listfile.txt rt.jar *.class

I tested with JRE 1.5_08 on Windows XP.

Practical AOP #2 - What's done behind-the-scene?

I'll show you something that I think it's hard to maintain without AOP.
As in my Practical AOP #1, I mentioned that I have 8 inter-type declarations and 5 pointcuts to make data-binding work in ZK framework.

The main important thing is that I need one of the ZK base class to implement my Bindable interface. This change can be considered as somekind of the architectural change. Other point is that several UI element classes need to be modified. One of my pointcuts weaves to add the special event trigger to, at least, 9 classes.

The figure below partially shows the UML-like class diagram for the data-binding aspect.

AOP | Modularity ~= Responsibility

It's difficult to making change to many opensource projects that their developers are taking full responsibility to their own codes. The process of changing must be done via their process. Many projects use the opensource community to find their bugs rather than feature enhancement becuase the developer still want to control the way the project should be. This is somewhat to crash the innovations. Someone who has some ideas to completely enhace the original project has to *fork* to the new project. In my opinion, we can use AOP to solve these social phenomena.

What I've done is in the same way I mentioned above. At the first place, I want to add some new features to ZK. I created some new code and was thinking about sending the patch to ZK developers. But I stopped and thought again. If I send my patches to them, my code may break their code and it's not good for the ZK community. The development may have to be slow down because something will be patched into the core. So my solution is to convert all my new code into an aspect. Then I'll take all responsibilities to my aspect rather than push it to the ZK core developers. I think this solution could be good when someone wants to contribute a new thing to the core of some working frameworks. That's why the data-binding aspect has been made.