Good Info About Java Technology

For people new to Java, copy and past the URL below for some great information about Java Technology.
Let me know what you think...
http://www-106.ibm.com/developerworks/java/library/j-starthere.html

Well, that's a good summary of all the Java technologies, and it's well organized for sure. Personally, I still think of java.sun.com as the definitive source for Java information, although I might peruse others from time to time also.

Similar Messages

Need info about Java in XI

Dear Experts,
Can You please suggest what are the java concepts to know for Java mapping in XI in order to work effectively in real time.It will be great if you can provide some links which give step by step procedure.
Awaiting your reply.
Thanks and Regards,
Venkat.

Hi Venkat,
There are two malor fields where java is utilised
1.Mapping
2.Adaptor Module development.
In mapping it can be Java Mapping or UDF.In java mapping u need to understand the parsers and their working wjile in UDF u need to knw very small but basics of Java I would suggest you to first go through the basics of Java as mentioned by one of my XI friend
Adaptor module requires good understanding of Java and implementations techniques
Regards

Which java technology is the best ??????

Hiii frnds.... I am new to java. I want to establish myself as a developer in programming field. I have good programming skills and a job in Infosys which is due for joining. I want to start with java but do not know how to begin...a technology with no less than 3000 classes, 10 separate fields, and a availability of no less than 1000 different titles books by several authors in market. Also, this site is tremendous to go with and a lot of stuff I don't know how to use this SDN well. Also, should i begin with core java or some other like j2ee, j2sp, netbeans or some other to end with..?? Please help me..

Well, the good thing about Java is that is very complex.
The bad thing about Java is that is very complex.
First of all you should try to understand the differences between: JSE, JEE, JME.
Then I recommend you to start learning the basics: Java Standard Edition. Sun's tutorials related to JSE are a good starting point.
After you finish with the language basics (oop concepts, string class, swing, sockets, threads) ->>
I strongly recommend to follow a path that leads to Java Enterprise Edition. That's were Java excels. Server-side applications.
Good materials:
- Sun tutorials.
- Prentice Hall Java.
- Head First series.
Go, go, go
PS: j2sp doesn't exist.
netbeans it's just an ide.
Edited by: nomemory on Oct 2, 2008 12:01 PM

Java technologies (JSP, Servlet, Reflection).

Hello.
I have questions about Java technologies.
3. what is it Stud&Skeleton and how are they created?
4. what is it Reflection?
5. what the relations between JSP and Java Servlets?
6. what is it Remote object and how is it created?
Thanks in advance.
Tomer

Hello.
I have questions about Java technologies.
3. what is it Stud&Skeleton and how are they created?http://java.sun.com/docs/books/tutorial/rmi/index.html
4. what is it Reflection?http://java.sun.com/docs/books/tutorial/reflect/index.html
5. what the relations between JSP and Java Servlets?http://java.sun.com/docs/books/tutorial/servlets/
http://www.apl.jhu.edu/~hall/java/Servlet-Tutorial/
6. what is it Remote object and how is it created?http://java.sun.com/docs/books/tutorial/rmi/index.html
happy reading!
cheers,
p

Java Technology Fundamentals Chat Transcript Available

The transcript of the September 30 online chat on Java Technology Fundamentals, with guest John Zukowski, is now available at http://java.sun.com/jdc/community/chat/JavaLive/2003/jl0930.html.
John answered a range of questions about Java technology -- anywhere from "What does "typesafe" mean?" to "Where might I find clear information about whether and when the garbage collector returns memory to the OS?"

The transcript of the September 30 online chat on Java Technology Fundamentals, with guest John Zukowski, is now available at http://java.sun.com/jdc/community/chat/JavaLive/2003/jl0930.html.
John answered a range of questions about Java technology -- anywhere from "What does "typesafe" mean?" to "Where might I find clear information about whether and when the garbage collector returns memory to the OS?"

Looking for infos about error code in Sun Java Directory Server 6.3.1.1.1

Hi,
I'm using Sun-Java(tm)-System-Directory/6.3.1.1.1 on Solaris 9 with two server configured in multi-master replication
For a few time I receive those warning in the error logfile :
[14/May/2012:06:18:40 +0200] - WARNING<5384> - Entry - conn=-1 op=-1 msgId=-1 - Entry error Convert LDIF entry into LDAP entry, fast method. Error: non-contiguous deleted attribute type for "myPasswordRetryCount"in entry dn="uid=nabcdycn, ou=People, dc=example,dc=com"
[14/May/2012:06:18:40 +0200] - WARNING<5384> - Entry - conn=-1 op=-1 msgId=-1 - Entry error Convert LDIF entry into LDAP entry, fast method. Error: non-contiguous deleted attribute type for "myPasswordRetryCount"in entry dn="uid=nabcdycn, ou=People, dc=example,dc=com"
[14/May/2012:06:19:11 +0200] - WARNING<5384> - Entry - conn=-1 op=-1 msgId=-1 - Entry error Convert LDIF entry into LDAP entry, fast method. Error: non-contiguous deleted attribute type for "myPasswordRetryCount"in entry dn="uid=nefghzer, ou=People, dc=example,dc=com"
[14/May/2012:06:19:11 +0200] - WARNING<5384> - Entry - conn=-1 op=-1 msgId=-1 - Entry error Convert LDIF entry into LDAP entry, fast method. Error: non-contiguous deleted attribute type for "myPasswordRetryCount"in entry dn="uid=nefghzer, ou=People, dc=example,dc=com"
[14/May/2012:06:20:44 +0200] - WARNING<5384> - Entry - conn=-1 op=-1 msgId=-1 - Entry error Convert LDIF entry into LDAP entry, fast method. Error: non-contiguous deleted attribute type for "myPasswordRetryCount"in entry dn="uid=nijklkkh, ou=People, dc=example,dc=com"
[14/May/2012:06:20:44 +0200] - WARNING<5384> - Entry - conn=-1 op=-1 msgId=-1 - Entry error Convert LDIF entry into LDAP entry, fast method. Error: non-contiguous deleted attribute type for "myPasswordRetryCount"in entry dn="uid=nijklkkh, ou=People, dc=example,dc=com"
and I would like to know what's going up and what I should do, so in case somebody have some infos about it, I would be very interrested.
I'm trying to find a way of veryfing fragmentation of the backend, but not sure about this.
TIA

Looks like the attribute sunIdentityServerDiscoEntries is defined twice in the schema. Run the following and see where it is defined for the second time.
# cd /var/opt/SUNWdsee/dsins1/config/schema
# grep -w sunIdentityServerDiscoEntries *.ldif | grep -iv objectclasses
Edited by: etst123 on Mar 3, 2009 1:28 PM

Where could I find some good free E-Book or paper about JAVA ?

Dear All,
I am searching some java websites , and find some free E-Book or paper about java,Could anyone tell me where those treasure are?
I will deeply appreciate you .
Thanks a lot !
Caton

You can try this one, tons of java resources:
http://www.cl.cam.ac.uk/users/asa28/useful_java_research_links.htm
Hope it helps.

What is the roadmap to a new comer in java technology?

Can some one define and explain the roadmap for a new comer who has just formal experience of using computer and keeps only basic knowledge about computers and computer programming? A new comer's mind is boggled with so many unkown terms. Can someone sort them out to make understand simply? What a new comer should know before dipping into the java technology and what must be learnt sequentially?

Take a look at these. Pick the one or ones you like.
Sun's basic Java tutorial
Sun's New To Java Center. Includes an overview of what Java is, instructions for setting up Java, an intro to programming (that includes links to the above tutorial or to parts of it), quizzes, a list of resources, and info on certification and courses.
http://javaalmanac.com. A couple dozen code examples that supplement The Java Developers Almanac.
jGuru. A general Java resource site. Includes FAQs, forums, courses, more.
JavaRanch. To quote the tagline on their homepage: "a friendly place for Java greenhorns." FAQs, forums (moderated, I believe), sample code, all kinds of goodies for newbies. From what I've heard, they live up to the "friendly" claim.
Bruce Eckel's Thinking in Java (Available online.)
Joshua Bloch's Effective Java
Bert Bates and Kathy Sierra's Head First Java.
James Gosling's The Java Programming Language. Gosling is
the creator of Java. It doesn't get much more authoratative than this.

Info about the RFC

Hi,
I have to work on RFC FM. Can any body give me the info about the RFC? especially for Function module?
Will give Reward points
regards,Ram

Hi
RFC (Remote Function Call) is similar to the general SAP fun module: except that in the attributes you click the radio button: RFC enabled;
and you will be passing an Import parameter DESTINATION to it.
Other code and usage will be similar to any fun module;
Have a look at any fun module in SE37 to understand better about the different components of Fun modules;
Refer this link:
http://help.sap.com/saphelp_nw04/helpdata/en/22/042518488911d189490000e829fbbd/frameset.htm
Function Modules doc
Function Modules;
Check this matter.
Function Modules are Global ABAP programs created by SAP for reusable purpose.they have IMPORT,EXPORT and TABLE parameters, and EXCEPTIONS to through when error occurs.
You can create them from TCode SE37.
Go through the following doc:
Function modules are cross-program, reusable procedures that are organized into function groups, and whose functions are implemented between the statements FUNCTION and ENDFUNCTION. Function modules and their interfaces are created in the Function Builder.
Function Module Interfaces
The parameter interface of a function module is defined in the Function Builder. It includes the definition of interface parameters and the specification of exceptions that can be triggered by a function module. The Function Builder automatically generates comment lines below the FUNCTION statement in the source code of the function module, which represent the interface of the function module with the following syntax:
Syntax
... [IMPORTING parameters]
[EXPORTING parameters]
[CHANGING parameters]
[TABLES table_parameters]
[{RAISING|EXCEPTIONS} exc1 exc2 ...]
The syntax and semantics of IMPORTING, EXPORTING, CHANGING, RAISING, and EXCEPTIONS mainly correspond to the definition of method interfaces with [CLASS-]METHODS. The additional option of defining table parameters using TABLES is obsolete.
Interface parameters
The interface parameters are defined on the relevant tab pages in the Function Builder.
IMPORTING parameters are input parameters. When the function module is called, a suitable actual parameter must be specified for every non-optional input parameter. The content of the actual parameter is passed to the input parameter when the call is made. The content of an input parameter for which 'pass by reference' is defined cannot be changed in the function module.
EXPORTING parameters are output parameters. When the function module is called, a suitable actual parameter can be specified for every output parameter. The content of an output parameter that is defined for 'pass by value' is transferred to the actual parameter if the function module is completed without errors. An output parameter that is defined for pass by reference is not initialized when the function module is called.
CHANGING parameters are input and output parameters. When the function module is called, a suitable actual parameter must be specified for every non-optional input or output parameter. When the function module is called, the content of the actual parameter is passed to the input/output parameter, and when the function module is completed, the content of the input/output parameter is passed to the actual parameter.
TABLES parameters are table parameters. Table parameters are obsolete CHANGING parameters that are typed as standard tables with a header line. If an internal table without a header line or a table body is passed as an actual parameter to a formal parameter of this type, an empty local header line is generated in the function module. If an internal table with a header line is used as an actual parameter, both the table body and the header line are passed to the function module. Pass by value is not possible in formal parameters defined using TABLES. Formal parameters defined with TABLES can be replaced by formal parameters defined with CHANGING. A local work area can be created for the internal table in the function module by using the addition LIKE LINE OF itab of the DATA statement.
Exceptions
The exception of a function module are defined on the Exceptions tab page in the Function Builder. Here you can select exception classes to define whether class-based exceptions are declared or non-class-based exception are defined. Class-based exceptions are represented in the above syntax by RAISING, and non-class-based exceptions are represented by EXCEPTIONS.
The addition RAISING is used to declare class-based exceptions that can be propagated from the function module to the caller. Exceptions in the categories CX_STATIC_CHECK and CX_DYNAMIC_CHECK must be explicitly declared, otherwise a propagation can lead to an interface violation. A violation of the interface leads to the treatable exception CX_SY_NO_HANDLER. Exceptions of the category CX_NO_CHECK are implicitly always declared. The declaration of exceptions of the category CX_STATIC_CHECK is statically checked in the syntax check. For exceptions of the category CX_DYNAMIC_CHECK, the check is not performed until runtime. In a function module in which class-based exceptions are declared with the RAISING addition, the statement CATCH SYSTEM-EXCEPTIONS cannot be used. Instead, the relevant treatable exceptions should be handled in a TRY control structure.
The addition EXCEPTIONS is used to define a list of non-class-based exceptions that can be triggered in the function module using the statements RAISE or MESSAGE RAISING. Exceptions defined in this way - as with formal parameters - are bound to the function module and cannot be propagated. If an exception of this type is triggered in a function module, and no return value has been assigned to it with the homonymous addition EXCEPTIONS of the CALL FUNCTION statement when the call was made, this leads to a runtime error.
Note
For new developments after release 6.10, SAP recommends that you work with class-based exceptions that are independent of the function module.
RFC is a technology which is used to access a functions (Modules) from
the remote systems.
If a function module is set as remote enabled which can be access from
the remote system via RFC.Eg: U can access the Remote enabled function modules in ur VB,Webdynpro,Java,Visual composer program.
A function module can be set as remote enabled by SE37->Go to ur FM->click the option Button "remote enabled".
But Normal function modules can not accessd from the remote system.
Good Example for RFC enabled function module is : BAPI(Business Application Programming Interface)
Note: All BAPIs are Remote enabled but not all remote enabled function modules are BAPI.
CALLING A FUNCTION MODULE:
1)In U ABAP Editor --> Click "Patter" ---> Selection Option Button "Call Function"
--> Write the Corresponding FM name --> Hit Enter
2)The appropriate import ,export Parameters will be displayed in ur editor
3)Pass the Values Here.
Also check these links.
http://www.geocities.com/victorav15/sapr3/abapfun.html
Check this link:
http://help.sap.com/saphelp_erp2004/helpdata/en/9f/db988735c111d1829f0000e829fbfe/content.htm
http://help.sap.com/saphelp_nw2004s/helpdata/en/ef/d94b78ebf811d295b100a0c94260a5/frameset.htm
http://help.sap.com/saphelp_nw2004s/helpdata/en/43/41341147041806e10000000a1553f6/frameset.htm
Check this link:
http://help.sap.com/saphelp_erp2004/helpdata/en/9f/db988735c111d1829f0000e829fbfe/content.htm
http://help.sap.com/saphelp_nw2004s/helpdata/en/ef/d94b78ebf811d295b100a0c94260a5/frameset.htm
http://help.sap.com/saphelp_nw2004s/helpdata/en/43/41341147041806e10000000a1553f6/frameset.htm
See the following links:
http://help.sap.com/saphelp_erp2005vp/helpdata/en/9f/db970e35c111d1829f0000e829fbfe/frameset.htm
http://help.sap.com/saphelp_erp2005vp/helpdata/en/9f/db970e35c111d1829f0000e829fbfe/frameset.htm
http://help.sap.com/saphelp_erp2005vp/helpdata/en/9f/db970e35c111d1829f0000e829fbfe/frameset.htm
http://help.sap.com/saphelp_erp2005vp/helpdata/en/9f/db970e35c111d1829f0000e829fbfe/frameset.htm
http://help.sap.com/saphelp_erp2005vp/helpdata/en/9f/db970e35c111d1829f0000e829fbfe/frameset.htm
http://help.sap.com/saphelp_nw04/helpdata/en/26/64f623fa8911d386e70000e82011b8/content.htm
Reward points for useful Answers
Regards
Anji

Want to know more about Java//???

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�     Beginning Drools - Rule Engines in Java by Brian Sam-Bodden
�     Develop Secured Ajax Applications by Olivier Poupeney
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hi

What platform/java technology should I use? Please Help

Hi, I am a uni student and have a final year java project to do.
The project must include:
1. a server side application that must run at specific times during the day (3 x a day) and store information to a database (MySQL).
2. a client side desktop application that will connect to the database and retrieve the information.
I have no problems writing the client side application. However, I am totally lost when it comes to knowing what server I need to have running the server side application and what type of java technology the server side application should use i.e EJB, entity beans etc??? How would the appliaction run at certain times, would I use a timer class? What would be the best way?
I would appreciate any advice you can give. Many Thanks.

Hi,
1. ok if I develop my application as a "normal" java
application does this mean that it needs to run on an
aplication server?No, it doesn't.
2. is developing the app as a normal java app
considered a good way of implementing such a system,
or would it be better to use enterprise bean
approach?That depends on your professor. Given nothing other than the requirements you stated, there is no need for an application server. You can just have a command-line app that runs forever to do these server things. However, if your professor wants you to learn about J2EE servers, then it's a different story. So ask your instructor.

What's your strategy for learning Java technologies?

Or, in other words, how do YOU acquire knowledge that is necessary for implementing Java technologies?
After having spent one-and-a-half years developing an enterprise app, I've gained lots of knowledge about Java and some surface knowledge about its related technologies (JBoss, Hibernate, Ant, XDoclet, NetBeans and probably some others I can't think of at the moment).
I'm now realizing that -- although the standalone prototype version of my program is growing mature -- I've still got lots to learn for refactoring it to a web platform. For example, I 've done small test projects using Servlets, but haven't done any work with JSP (or HTML for that matter) yet.
Now, I'm sure I can learn JSP etc., but the questions I ask myself are: how long will it take?
It's a rhetorical question of course (I don't expect an answer from you, the reader) However, it's an important issue because the months or years I spend fumbling around learning these new technologies, are time I could otherwise spend on the business logic and functionality of my program.
So, how do you guys acquire knowledge of technologies? Official training perhaps? Or do you simply experiment until it works? Or do you rely on your company's knowledge base (e.g. someone in your company knows how it works)? Or do you get prototypes built from someone who already knows how it works?
I�m really curious about this and would appreciate your thoughts.
Thanks in advance,
P

Well, it seems like most of you simply read the
various texts and try the vendors' examples. I'm
surprised that no one mentioned ever having bought a
prototype application from the onset. "bought"? What's that mean? You don't buy prototypes. You download evaluation versions, maybe.
I try to find sample code and tweak it to see the effects. Otherwise, I start writing small sample code an build on that.
I consider myself a reasonably competent core Java
programmer, but I had serious difficulty configuring
and merging its related technologies. There were so
many disjointed pieces of instructional information
that the additional research time really hurt our
budget severely. Not an uncommon thing, I'm sure. There's a lot of stuff. But don't bother learning all of it. Not in detail, at least. It's a good idea to familiarize yourself with the names of packages/libraries and what they do. But only really learn what you need to learn for what you need to do. The next project you will probably need other things, so you learn them then.
bsampieri,
I've setup Tomcat and tried the examples--in fact, I
normally follow tutorials for all products I hope to
use. Problem is, the examples and tutorials never
address my specific needs. So, I usually inch toward
my goal by spending weeks or months in forums to
continue where the tutorials leave off. Anything complex is going to not be there.... the trick is to identify pieces that you can pull out to build more complex apps. And the fact that JSP/servlets have the issue of being compounded by all the HTML/CSS/JS and HTTP protocol ... I don't want to say limitiations, exactly... Well, it just makes things more complex and harder to know what you need.
Perhaps you guys are much faster and smarter than
I...or you have a much bigger budget :)Probably not... on either account.

How get info about computer app is running on?

I am making an application that will have a license for running on only one computer at a time. I will have a license file that will hold info about the app, its version, etc. But I also want to put info about the computer that it's being installed on (none of that info will be sent to me, just saved in the license - enrypted - so the license can't be used on a diff computer). I do NOT want the OS name and version (they can change that) but the actual computer info.
I know some C/C++ programs can do this, but is there any way to get this info from java? Does anyone have any sample code or even just suggestions of places to look for this information? It'd be greatly appreciated!
Thanks in advance!

I know it's not a perfect solution - yes someone could
decompile it, but how many people do that or know how
to do that? Well, most semi-decent Java programmers know how to do that. Then they'll decompile and crack it and distribute it, provided that your
program actually is something good.
While doing what I suggest wouldn't stop
100% of the users from pirating my software (which I'm
attempting to make a living off of), it would stop
MORE than if I didn't do it.Probably it'd annoy more potential customers. It's a very bad idea to piss off the customers.
As for changing the HD, or even the computer it's on,
that would be totally possible. The app is equipped
with a way to invalidate the license so it won't work
on that computer, and contact my site to invalidate
the public key and then allow them to redo it on
another computer/HD. It all would take only about 2
minutes actually, so it's not even an inconvenience.As a potential customer I'd have to disagree.
I see no problem with that.Yes, but you're the author not the customer.
Do you or anyone else know of a way to do this, even
if not through Java, in C (JNI) or C++?Through JNI it's possible naturally, but I don't know the specifics.
The reason
it's a big deal is this: for a company like MS if only
20% of the users of their product actually pay for the
product, they're still making millions. If only 20% of
the users paid for mine, I wouldn't even have enough
money to live for 3 months!Get a job? :) Sorry, but seriously having copy protection isn't really going to make a difference. If your product is really good it will get cracked, if it's a specialized piece of software that won't be circulating in the mainstream, then a simple license check would suffice.

Java Technology:, demographics, new, active, abandoned, obsoleted?

Hi Folks,
I am trying to get a handle on where the Java community is going in regards to the plethora of java technologies currently available. Of the 10+ years that java has been around - has any of the technologies available today been obsoleted or just not in favorable use in lieu of better or replaced technologies in use today?
Yes, I know there is a LOT of different technologies available but what I am trying to do is to make a list of technolgies to focus on, the ones that are really being used by the Java community today.
For example - Where is the Jini community going? What about all the supporting things that go with Jini - from services as: Reggie, Mahalo, Phoenix, Fiddler, Norm, Mercury, Outrigger, Browser, and HTTP daemon and is anyone actually using all of these services? I note there is a link for this technology: www.jini.org - and leads me to believe this is a breakaway (spinoff?) from Sun's site? This is just an example technology to make a point.
Is there any place to go to (link) that will at least list all of the Java technolgies available today and to show what technolgies are abaondoned, still active, and perhaps a demographics showing interest and active use by the Java community, a roadmap?
Kind regards,
Dan

Hi Folks,
I am trying to get a handle on where the Java
community is going in regards to the plethora of java
technologies currently available. Of the 10+ years
that java has been around - has any of the
technologies available today been obsoleted or just
not in favorable use in lieu of better or replaced
technologies in use today?
Dozens of API's. Even more implementations of API's, open source or not.
Yes, I know there is a LOT of different technologies
available but what I am trying to do is to make a
list of technolgies to focus on, the ones that are
really being used by the Java community today.
Read the posts in these fora. A good first start as to what is being used.
For example - Where is the Jini community going?
What about all the supporting things that go with
h Jini - from services as: Reggie, Mahalo, Phoenix,
Fiddler, Norm, Mercury, Outrigger, Browser, and HTTP
daemon and is anyone actually using all of these
services? I note there is a link for this
technology: www.jini.org - and leads me to believe
this is a breakaway (spinoff?) from Sun's site? This
is just an example technology to make a point.
Is there any place to go to (link) that will at least
list all of the Java technolgies available today and
to show what technolgies are abaondoned, still
active, and perhaps a demographics showing interest
and active use by the Java community, a roadmap?
http://www.google.com :^)
http://java-source.net/
Kind regards,
Dan- Saish

Any good articles on browser technology ?

Hello everyone,
Can someone recommend me some good articles on browser technology ?
I would like to know more about this in order to do better user interface design.
Thank you in advance !
Rachel

Err...
Good interface design is somewhat independent of browser technology. Or more precisely, you should be thinking about the simplest, most intuitive way for a customer to perform a task and then determining if the technology can support it, not the other way around.
I realize that in some corporate settings, you are kind of locked into a specific technology and need to come up with the best user interface that fits. Unfortunately, this does result in problems and unnecessary work, and generally, you won't be able to avoid it if technology is the primary focus.
In any case, pretty much the best user-interface "tutorial" that I know of is http://www.webpagesthatsuck.com. What they do is look at a bunch of well, really bad sites, and criticize them in such a way that you learn what not to do, and why.
I don't really think there is a similar best browser technology web site, because there are always multiple ways to code/present something and which method is best is a matter of personal preference. For example, ASP and JSP do almost functionally the same thing, and people tend to pick one or the other based on their familiarity with the syntax (Java verses VisualBasic).
Fortunately, the list of available technologies is rather short such that you can easily evaluate them and determine which is best suited to your needs. Off the top of my head, JavaScript and various Macromedia technologies (Flash, Shockwave) are pretty much the only universally accepted client-side technologies. VRML is also available, but not very commonly used.

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