Some generic questions about JMF

Hi, as new to JMF, I would like to ask some generic questions about JMF from this community
Though including RTP stack, JMF is only compatible to old RTP draft, RFC1889. I know that Sun stopped developing/supporting JMF. What is the alternative solution for JAVA RTP implementation suitable for a serious SERVER project, not just a school-term project? Has anyone thought about that or may have already moved forward? Is that any commercial or more updated Java based RTP stack currently? I searched with google. Besides jrtp, a school project, and I could not find a nice one. Majority of RTPstack implementation is C/C++.
My second question is if there is the performance analysis and comparison of JMF. I know that some client applications such as SIP-Communicator adopt JMF for media delivery. But it is for one user in one machine. I wonder if any server application has adopt JMF as media relaying layer.
I appreciate any input from this community.

erwin2009 wrote:
Hi, as new to JMF, I would like to ask some generic questions about JMF from this communitySure/
Though including RTP stack, JMF is only compatible to old RTP draft, RFC1889. I know that Sun stopped developing/supporting JMF. What is the alternative solution for JAVA RTP implementation suitable for a serious SERVER project, not just a school-term project? Has anyone thought about that or may have already moved forward? Is that any commercial or more updated Java based RTP stack currently? I searched with google. Besides jrtp, a school project, and I could not find a nice one. Majority of RTPstack implementation is C/C++. There is one active project out there, Freedom for Media in Java, that has RTP capabilities. It's obviously not from Sun, but it's the only other RTP-capable project I am aware of, other than FOBS4Java, I believe is the name of it.
What they are suitable for is beyond my scope of knowledge, I only know of the 2 projects.
My second question is if there is the performance analysis and comparison of JMF. I know that some client applications such as SIP-Communicator adopt JMF for media delivery. But it is for one user in one machine. I wonder if any server application has adopt JMF as media relaying layer. None that I have seen, except for various projects I've helped people with on this forum. But, if someone is asking for help on a forum with his/her server application, it probably doesn't meet the guidelines you just laid out ;-)
I appreciate any input from this community.Sorry I don't have more to add to your inquires...

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I have a Macbook Pro june 2011... I have 8GB ram but I only have 256mb VRAM... I've read some other questions about this and I realized... Why do I not have 560mb of VRAM since I have 8GB of RAM? Is there any way to get more VRAM to play games on steam?

I have a Macbook Pro june 2011... I have 8GB ram but I only have 256mb VRAM...
I've read some other questions about this and I realized... Why do I not have 560mb of VRAM since I have 8GB of RAM?
Is there any way to get more VRAM to play games on steam?
I've learned by reading other topics that I can't upgrade my graphics card on my Macbook Pro because it's soldered into the motherboard or somthing like that, but please tell me if there is any way to get more video ram by chaning some setting or upgrading something else. I'd also like to know why I only have 256MB of VRAM when I have 8GB of RAM, since I have 8GB of RAM I thought I was supposed to have 560mb of VRAM...
So the two questions are...
Is there any way to upgrade my VRAM, so that I can play games on steam?
Why do I only have 256MB VRAM when I have 8GB total RAM?
Other Info:
I have a quad core i7 Processor.
My graphcics card is the AMD Radeon HD 6490M.
I am also trying to play games on my BOOTCAMPed side of my mac, or my Windows 7 Professional side.
THANK YOU SO MUCH IF YOU CAN REPLY,
Dylan

The only two items that a user can change on a MBP are the RAM and HDD (Retinas not included). You have what the unit came with and the only way you will be able to change that is to purchase a MBP with superior graphics
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Ciao.

Some generic questions on BPM of NW CE

Hi Gurus
i have over 6 years of ABAP business workflow experience and over 3 years of XI experience. Now i'm getting tough with this new stuff, BPM of NW CE. Here i have some generic questions of it:
1. How can i trigger a BPM task while a document, like a sales order , has been created in the system? is there any processes to catch the event of R3 in NWDI?
2. Can BPM consume RFC/BAPIs in R3?
3. Is it possible to make message mapping in BPM? i found there is a 'mapping' choice in the context setting of NWDI whereas it is quite simple compared with PI.
4. Can the BPM be integrated with webdynpro ABAP? or send the relevant tasks into R3 directly? Actually what i mean is , can i bypass java programing while dealing with BPM of CE, if possible.
thanks

Hi Stephen,
In the first released version of SAP NetWeaver BPM it is not possible to catch events of R/3 directly. Anyway. In case you have the possibility to trigger a web service in that situation you could start off a specific (BPM) process instance that handles the situation.
The same is basically true for the question regarding RFC: In the initial version you'd need to wrap the RFC into a web service in order to consume it.
The mapping possibilities in SAP NetWeaver BPM are meant to perform data flow between different activities in a BPMN based process model. This way you could transform a message that came into the process in that way that if fits your needs in regards to the BPM process (data) context.
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Best regards,
Martin

Some basic question about SCM Installation

Hi Folks,
Could you please advice me about some basic questions about SCM and its installation -
Q1. Do I need to have an R/3 System to be able to practice OR demo the SCM system?
Q2. If, yes, which version of SCM is compatible with the ECC 5.0?
Q3. What are the basic requirements to install SCM (version compatible with ECC 5.0) and ECC on a oracle db and windows OS?
Q4. Does SCM have APO and BI as an inbuilt functionality OR does the user need to purchase these as an Add-On?
I know these are some basic questions, but these will help me give me a direction.
With best wishes,
Krishna

Hello Krishna -
Q1. Do I need to have an R/3 System to be able to practice OR demo the SCM system?
---> There are various Modules in SCM Like APO (Sub Modules DP (stand alone), SNP Needs Master data from R/3 and has to pass on transactional Data to R/3, PPDS same as SNP, GATP same as SNP), ICH needs Data from R/3 to work with. Core Interface (CIF) connects R/3 to APO for transferring data.
Q2. If, yes, which version of SCM is compatible with the ECC 5.0?
-->For thorough understanding explore the following links
http://help.sap.com/saphelp_scm41/helpdata/en/9b/954d3baf755b67e10000000a114084/frameset.htm
http://help.sap.com/saphelp_scm50/helpdata/en/9b/954d3baf755b67e10000000a114084/frameset.htm
Q3. What are the basic requirements to install SCM (version compatible with ECC 5.0) and ECC on a oracle db and windows OS?
-->Refer Above
Q4. Does SCM have APO and BI as an inbuilt functionality OR does the user need to purchase these as an Add-On?
--> APO comes with a small BI inbuilt functionality. you can only perform certain functions using that BI.
Hope this helps.
Regards,
Suresh Garg

Some basic questions about DAC

Hello
I am just starting to use DAC now and I have some basic questions about DAC..
1: How many different kinda image tables are there, what are they used for?
2: In order to check which ETL mapping with in the same execution plan is taking a long time, what to do? I mean is there a table that stores such info?
3: How to determine which ETL task to run after and which after?
4: Is subject area always map to the Informatica workflow folder? Or what should subject area be?
Please shed some lights on it, deeply appreciate!
Thanks

Hi,
I have problems to understand you question but will do a try:
From a logical point of view objects can be only serialized reasonabely when they have a state of it's own which can be reestablished at a later point in time and space without further dependencies.
F.E. a "serialized file" would NOT make much sense cause it depends heavily on the state of the underlying file system.
You can't expected that is can be deserialized at a later point of time (physical file refered may not longer exists) or on another machine, where the serialized object was transported to.
Technical - at zero approach - it's more or less trivial. Simply implement Serializable and all non static, non transient fields of your object will be serialized automatically.
But there is a couple of pitfalls, you should study documentations regarding this feature.
Hope this helps
Martin

Some random questions about integration features

Greetings,
after working for a few weeks with Autovue's ISDK (web server) and having some sucess with its integration with our custom CMS, I have a few random questions about what can be done and what can't be done. So, instead of opening many new threads, I'll post them here together.
1) Translation. We are localised in Russia, and its translation is incomplete. I have found a tra_en.properties file in AutoVue/bin, and a description about how to create a properties file for custom actions. But no information about how to translate to other languages - and russian translation appears to be packed within the jar of the applet. Is there a clean way to translate, or refine the current translation, so we don't get a mix of russian and english commands in the applet? Because my tries using EXTRABUNDLES have failed, as I don't want to add a bundle for extra actions, but to replace it for existing ones.
2) Attachments in markups. Markups allow to attach other files, but since our CMS is custom, we only get the option to attach files from our local drives. We did no browse integration with the CMS, as people with different levels of permission will have different access to files there, and we considered unnecessary to provide that level of integration. We are considering to remove this action from the GUI, but before that I'd like to evaluate how hard would it be to generate an upload file action, so the attached file would be stored in the custom CMS and linked to it so the whole thing worked. My guess is "it will be hard and time consuming", so for now, we are considering to delete this feature in our integration.
3) Is there a way to resize the Open markup dialog? We have several properties displayed, and fit well within a standard screen, but the dialog is small and you have to scroll the table to see all properties.
Thanks for any assistance with these issues

As always, thanks for the fast answer, Artash.
Yes, now I see attachments are stored inside the markup file. The problem is, when I open markup mode for the attachment, since the attachment uses some kind of default access method, my url's from the integration with the background CMS are broken completely. I believe the ideal state here would be to make some kind of inner markup for the attachment, maybe stored within the original markup file along the attached file. Or maybe it works that way, and I need to access it with the default gui action instead of my custom one. If that is the case, is there any way to tell the gui file how to differentiate a standard opened file from an attached one? If so, the issue has solution. If not... Well, then maybe something escapes me.
Edited by: Jordi Bosch on Apr 6, 2012 12:27 AM

Some basic questions about rmi registry context "bind" and "lookup"

We have more processing to do than can be accomplished with a single computer. To solve the problem I've implemented a distributed computing solution using RMI. (The first time I saw RMI was about 2 weeks ago, so please bear with me!)
The implementation is a proof of concept not a fully fleshed out system. I have one "Workunit Distributor" computer and any number of "Data Processor" computers all on the same lan segment. "Workunit Distributor" and "Data Processor" computers are both RMI client and server to each other. The "Data Processor" computers are given the ip address and name of the "Data Distributor" on the commandline when they start. They communicate their willingness to receive and process a workunit to the ""Workunit Distributor" via a RMI call. Work units are sent to available "DataProcessors" and results are eventually returned to the "WorkunitDistributor" (minutes or hours later). The model program works quite well, and appears to be capable of doing the processing we need to get done.
But now that it seems viable, I've been asked to make it a little more scalable, flexible and self configuring. In particular, instead of one "Workunit Distributor", any number of "Workunit Distributors" should be allowed to show up or disappear from the lan at any time and the system should continue to function. I've worked out a good scheme for how this can be done, but I have a couple of questions about the RMI registry (registries?). I'm trying to keep from implementing some functionality that may already be available as a library or subsystem.
With my current model design, each computer binds to its own registry with a unique name. For instance:
CRDataProcessorImpl crdpi = new CRDataProcessorImpl(svr);
Context crDataProcessingContext = new InitialContext();
crDataProcessingContext.bind("rmi:"+hostName, crdpi);
Currently the "Data Processors" get the info they need for a Context lookup() of the one and only "Workunit Distributor" from the commandline. And the info the "Workunit Distributor" needs to do a Context lookup() of a "DataProcessor" is passed to it from each "DataProcessor" via a RMI call.
But in the newer (yet to be implemented) scheme where any and all "Workunit Distributors" show up and disappear whenever they feel like, the naming bootstrapping scheme described above won't work.
I can imagine a few ways of solving this problem. For instance, having "Workunit Distributors" multicast their contact information on the lan and have a worker thread on each "Data Processor" keep track of the naming information that was multicast. Another alternative (more organized, but more complex) might be to have a dedicated host with a "well known" address and port that "Workunit Distributors" and "Data Processors" could all go to, to register or look up at an application level. Sort of a "domain name service" for RMI. But both these schemes look like a lot of work to implement , debug and maintain.
The BEST thing would be if there was one plain vanilla RMI registry that was usable by all RMI enabled computers instead of having each computer have its own local name registry. In volume 2 of the Core Java2 book it says that every registry must be local. I'm only hoping there's been progress since the book was published and now a central rmi registry is available.
If you have any ideas about this I'd like to hear what you know.
Thanks in advance for any advice.
Lenny Wintfeld
ps - I don't believe web services, as full featured as it is, is a useful alternative. I'm moving 100's (in the future possibly 1000's) of megabytes back an forth for processing.

The local bind/rebind/unbind restriction is still there and it will always be there.
I would look at
(a) RMI/IIOP, where you use COSNaming as a registry, which doesn't have that registriction, and which also has location-independent object identifiers
(b) Jini.

Some basic questions about serialization

Hi,
I have some basic questions on serialization.
1. What are the basic criteria to make an object serializable(except that it must implement serializable ?) I mean that objects of some class inherently cannot be serialized so any object must have some features which makes it serializable/non serializable.
2. I know it makes no sense to serialize a socket because it is fixed only by specifying ip and port at both ends, and is valid only when the network connection remains valid. Still in the context of my previous question, I would like to know why a socket cannot be serialized.

Hi,
I have problems to understand you question but will do a try:
From a logical point of view objects can be only serialized reasonabely when they have a state of it's own which can be reestablished at a later point in time and space without further dependencies.
F.E. a "serialized file" would NOT make much sense cause it depends heavily on the state of the underlying file system.
You can't expected that is can be deserialized at a later point of time (physical file refered may not longer exists) or on another machine, where the serialized object was transported to.
Technical - at zero approach - it's more or less trivial. Simply implement Serializable and all non static, non transient fields of your object will be serialized automatically.
But there is a couple of pitfalls, you should study documentations regarding this feature.
Hope this helps
Martin

Generic questions about CMYK profiles and proofing

I just read a big book about color management and am trying to make it happen but it seems that in real life I can't get good results.
I have my scanner profiled and it produces aRGB docs.
All good and fine. The images look good on the monitor (which also is profiled.)
Now these images I place inside InDesign as aRGB.
And at some point comes the time for soft proofing.
So I start experimenting with different CMYK profiles.
First question: Should I already do a CMYK conversion for my images in Photoshop or is it ok to do it in InDesign when exporting to PDF?
Coated Fogra27/39, ISO Coated v2 and Euroscale Coated v2 seem to change the colors only slightly.
But when I turn on "Simulate Paper Color" all hell breaks loose. The paper color seems to be always a cold horrible grey and the image is darkened and dulled. It looks like in need of serious color correction.
And further how do these generic profiles know about my paper color anyway?
So maybe this feature should only be used if the profile is custom made for a specific printer and paper.
Second question: has anyone succesfully used the simulation of paper color with a custom made profile?
But it seems that custom profiles are something I can only use at home because the printing service providers seem to be quite unaware of profiling their machines for a specific paper (or profiling it at all).
They tell me to send a "pure" CMYK file without any profiles. But that is impossible because to transform an RGB in CMYK one MUST use a profile.
Third question: Which kind of profile should I use when I am instructed to provide a profile-less CMYK document?
And finally what is the purpose of proofing in the first place if I don't know exactly the profile created for the combination of the output machine and output paper? This issue becomes clearer when using (slightly) colored paper.
- Rami Ojares

>First question: Should I already do a CMYK conversion for my images in Photoshop or is it ok to do it in InDesign when exporting to PDF?
You can save the conversion until you make the PDF if you like, especially if you don't know the correct profile in advance, but you lose the ability to fine-tune and individual image.
>But when I turn on "Simulate Paper Color" all hell breaks loose. The paper color seems to be always a cold horrible grey and the image is darkened and dulled. It looks like in need of serious color correction.
I think this is mostly a case of your eye accommodating to the brightness of the screen. I'm not sure how to avoid this, and I generally don't use the simulate paper color. Comparing my screen to the real printed output without the simulation seems pretty close. Even a generic profile makes an assumption about the color of the paper stock, but a custom profile would be more accurate.
>Third question: Which kind of profile should I use when I am instructed to provide a profile-less CMYK document?
As you already said, you can't do the conversion without knowing the profile. What they are asking is that you don't embed that profile when you do the conversion to PDF. This means they can use a file prepared for the wrong profile and not risk further conversion at the RIP which would create rich blacks from you 100% K elements (type), but the colors wouldn't be 100% correct unless the profile you chose for conversion originally matched the press.
Generic profiles are a quasi-standard that most presses can match, but may not be able to produce quite as wide a color gamut as a custom profile, but many presses don't have a custom profile available. You should ask for a "contract proof" to check the color before the press runs, and if possible go to the printer for the make-ready and check the color on the press before the whole run is printed. There is a LOT of color control available to a skilled press operator, and expect some variation through the run.
Peter

Some basic questions about foriegn key , and relationships.

Hi
Thank you for reading my post
I read some documents about foreugn key and tables relation ships.
but i still can not understnad some stuff.
1-when we have a foreign key , we have two tables that we want to relate them together
in a way that one of ? table columns forced to be a value from ?? table column.
what is name of those two tables , i saw , child-parent , ..... which confuse me.
can some one please tell me correct name of those two tables ?
2-some times we need some kind of master details relation like :
one-to-many : i this case MANY table will have a column to point a record in ONE table , can this relation be a foreign key relation ?
3-we can achieve many-to-many relation only by using a helper table to host both tables primary keys in a record to relate them together.
can you point me to some resources that help me to find answers to this questions ?
or explain them to me ?
thank you for your time.

These are critical database basics that you need to understand. I would seriously recommend getting some study in, because proper relational database design relies on the basic principle of data and relationships and a process called normalization.
In reality, you only really need one gigantic table to host data. It would include everything you would want to know about something - let's take a sales order for example. You would have to record the customer's name, address, etc. along with every item they ordered, etc. You would have a HUGE table full of data that appeared over and over and over again. This is bad design for two basic reasons: it is difficult to query, and it is very easy to have minor mistakes like capitalization or alternate spellings that prevent things from matching up properly. For example, let's say Bob orders 40 widgets and 40 digits. In our hypothetical table, we could put it in as Bob - 40 widgets and Robert - 40 digits. See how confusing this can get even in a simple example? And let's say you wanted to correct all of Robert's orders to say Bob and you found out there were 40 orders from "Robert" How would you know which ones to change?
The process of normalization helps to reduce the chance for these types of errors in addition to creating a good basis for indexes. You normalize the data by creating sets of parent/child tables with a "key" value to match them. In our hypothetical situation, you could create a table for orders and a table for customers. In the customers table you give all the detail for the customer in one place, and you assign each customer a unique number or ID. In the orders table we add the customer ID (NOT the name) and we ensure that we are getting the customer we want, in addition to saving a lot of space and eliminating redundancy. In our example, the customers table is the "parent" table and the orders table is the "child" table. The child table references the unique entries in the parent table via that id. That reference is referred to as a foreign key. The foreign key in the child table points back to the original and complete record in the parent table and eliminates the redundancy of keeping all that extra data for every order. Foreign keys in child tables always refer to a primary/unique key in the parent field.
That help?

Some basic questions about Java ME

Hi,
I am new in the world of Java ME, I started to read about the technologies around it and for this reason I have some questions.
There are 2 platforms CDC and CLDC and on top of these platforms there are some profiles, for example Personal Profile for CDC or MIDP2 for CLDC. On the next level (on top of these profiles) are some JSRs which are treated as optional packages.
I saw that the CLDC emulator from SUN - WTK contains for example JSR 179 for Location based services and JSR 226 - SVG rendering. But the counterpart for CDC doesn't contain them.
How can these JSRs be added to the CDC stack? are there some implementations of these JSRs as jars or something like this? or on the JCP site are only the specifications of this JSRs and if someone wants to add these JSRs to an emulator (virtual machine) he should implement these specifications?
I hope that I have explained properly my "puzzle" and that someone will answer to my questions.
Thank you

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Some general questions about swing

Hi,
I used to do some swing development couple years back but since then I have been more involved in the j2ee scene. I have lost some touch and was wondering if some of my questions can be answered. I'd appreciate every effort.
First of all, I am trying to make an applet that can be used to upload multiple pics at the same time. Similar idea to facebook picture upload applet. My Q's are
-> can every swing application be turned into an applet? or when the developer starts writing an application he should write it from an applet POV
-> I noticed that the applet on facebook looks a lot like a window application. icons and the look and feel of the application is not that of a applets i saw couple years ago with sun java look and feel, how can this be achieved? is there some small example?
-> can someone suggest an example || tutorial of an applet that shows how to upload an image to the server?
and lastly for mental satisfaction :)
-> how hard do you think it is to build such an application. I assume it will just have a JTree on the left side and on right side it will show contents of the folder that is currently clicked.
Thanks for your time

thanks for the tutorial link.
However, the tutorial explains how to show icons from images. But what about in my case when the images arent even on the server yet.
Basically when the user is browsing files and gets to their my pics folder on the right side i want to show icons of images in that folder. for this reason i doubt I will be able to use what they've implemented in that tutorial. As the pics havnt yet been uploaded by the user i have no direct access to the images.

Some general questions about recently purchased Powerbook G4 15"

Hi guys,
I finally got my used Powerbook G4 15" A1095 1.5ghz off eBay and it's got some issues, any help would be great:
1.White areas on the screen, not to concerned about it but i can see them?
2.Some spots of dirt "behind" the screen all the way down the right edge of the display? These are not dead pixels?
3.Won't read dual layer dvd's? (i know it can't burn them)
4.Tatty case. (I have purchased a new lower case top case and lid from The bookyard for a total of £60 and i am having our It guys replace these for me to tidy it up.)
5.After buying these bits i've since discovered the lower ram slot is faulty so i'm stuck with 1gb?
6.Can the dirt behind the screen be removed when the lid is changed or are they in the display itself?
I did try and return the book to the seller but pretty much got nowhere so i'm stuck with it. On the plus side the screen has no dead pixels, is nice and bright and the machine runs pretty fast. I only use it for web surfing and music some it's fine.
Phew! sorry the the mass of questions!

Sounds like you bought yourself a project - or some else's troubles.
The internal drive won't read dual layer DVDs. They were not even invented when the PB was released.
The dirt behind the screen hints that the machine has been apart. It is possible to get the front glass off, but as eww stated it is not a fun or easy job.
The white spots sound about right for an aging Powerbook. I'm guessing you are not using it as a portable cos I'm sure the battery is smoked too. Hook it up to a nice large external display. The PBs have a powerful video card and give great color depth on a decent display.
The failed RAM slot is a killer, but common. Mine is the same. 1GB of RAM does the job, so don't give it a second thought.
Sadly, the Powerbooks are at the end of their life cycle as a portable, but they do make great desktop computers with a few peripherals. Set it up with a nice widescreen display, an external firewire DL DVD drive and a cooler pad and you should have a lot of fun with it.
Don't put Leopard OSX 10.5 on it! It will just slow it down and give you a whole new bunch of issues to address.

Some quick questions about Zen Microph

Hello,
I just received my Zen 8GB Microphoto today after recently purchasing it and I love it so far, but I have a couple questions.
. The pdf manual that came with the installation disc makes it clear that you shouldn't jog with the Zen Micro since continuous shocks aren't good for it. This is a bit of a shock (no pun intended) for me since I planned to use this quite a bit while running, and I know that micro-dri've MP3 players are susceptible to shock which results in skipping, but this seems a bit extreme. Is this statement just "extra-precautionary" so Creative can say to you, "I told you so" just in case it breaks, or has anyone actually have one of these things break pretty quickly from jogging with it's
2. This might be a stupid question but according again to the pdf manual you have to be using the supplied headphones to scan for radio stations as well as recording radio stations while listening to them, but nothing was mentioned about simply listening to FM radio. Will I be able to use the FM radio feature without using the headphones that came with my Zen Photo. I'd test but I haven't had a lot of time to mess with it yet and it's still charging, but I would really hate to have to not use my Shure E3cs in order to be able to use the FM radio.

Hello,
I just received my Zen 8GB Microphoto today after recently purchasing it and I love it so far, but I have a couple questions.
. The pdf manual that came with the installation disc makes it clear that you shouldn't jog with the Zen Micro since continuous shocks aren't good for it. This is a bit of a shock (no pun intended) for me since I planned to use this quite a bit while running, and I know that micro-dri've MP3 players are susceptible to shock which results in skipping, but this seems a bit extreme. Is this statement just "extra-precautionary" so Creative can say to you, "I told you so" just in case it breaks, or has anyone actually have one of these things break pretty quickly from jogging with it's
2. This might be a stupid question but according again to the pdf manual you have to be using the supplied headphones to scan for radio stations as well as recording radio stations while listening to them, but nothing was mentioned about simply listening to FM radio. Will I be able to use the FM radio feature without using the headphones that came with my Zen Photo. I'd test but I haven't had a lot of time to mess with it yet and it's still charging, but I would really hate to have to not use my Shure E3cs in order to be able to use the FM radio.

Some general questions about java

Hi,
I am a beginner with java and actually i am new to programming as such. i want to ask certain questions.
I read in The Java Tutorial that java is both a 'compiled' and an 'interpreted' language while most languages fall in either one of the two categories. What is the difference between a compiled and an interpreted language?
All the java programs that we right are compiled by the java compiler. So in what language was this java compiler and java VM written
What is the definition of native code. Does it depend on the operating system ? If so, is it defined by the operating system ? If I am not mistaken, an OS in itself is a huge program, so which language can be used to create an OS. For instance, can an expert in java create his own OS using the java programming language ?
These questions may sound silly but I need to know the answers

Okay, a compiled language is completely translated into object code (one and zeroes, usually) before it is run. An interpreted language is turned into object code as it runs. The object code for most languages is the ones and zeroes that make sense to the processor. The object code for Java is Java bytecode.
Java bytecode is a set of universal commands that make sense to any Java Runtime Environment (JRE or Java Virtual Machine JVM. I think they're the same thing, someone correct me if I'm wrong,). The JRE is an interpreter. Each JRE is specific to the platform, that is; there's a Windows JRE and a Solaris JRE and yada yada. The JRE interprets the bytecode commands and turns them into commands for the platform. For instance, a bytecode command is something like, "draw a window" and the JRE turns this into the Windows or Solaris command that draws a window.
I don't know what language Java was written in. It may not all be written in one language. It's very possible that the Java compiler (javac) and the java interpreter (the JRE) are written in entirely different languages. I'd suspect the answer to this can be found in van der Linden's "Just Java" book.
Native code, in Java, usually refers to legacy code, existing code written in whatever language that you wish to use in a Java program. Maybe the native code costs too much to convert; maybe it works really well, maybe it does soemthing special, whatever -- you want to use it so you use the native command in a Java program to tell Java to run this piece of code in whatever language. Native code doesn't really have anything to do with the OS other than it's code that runs on the OS you want the Java program to run on.
An OS can be written in anything you want, but some languages are better than others. I think the Mac OS is/was mostly Pascal. Wasn't C invented in order to write Unix?

Some generic questions about JMF

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