Java File System

Hi,
Can any one explain how to find out whether the given folder is shared or not? If possible code snippet please...
Thanks in advance,
Rag

Try checking if the remote share is 'visible' from your computer. If it is shared then you can 'see' it. But you may need to try writing something into it to get to know if you are allowed to read and write to that folder.

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How to make bank management system using java file system

Hi, I have some fields
1.ID
2. Deposite
3. Withdraw
4. Balance
Now how can i manage this Bank Management System using java file system.
Thanks in advance.

Then we're back to (1): Do your own homework. Google has zillions of links on handling files in Java. When you have written some code and have an actual problem, we'll be happy to help you with it.
(edit) Incidentally, this sounds suspiciously like the sort of problem they set for the certification programs. In which case, don't bother; they're not worth the virtual paper they're printed on.

How to read a client's File system

Hi,
I use a web application where in the client can upload a directory to the server. Then the server should display all the files under that directory by fetching details from the client's disk.
how should this b done with java? Java file system does not allow this. If contents of a single file needs to be read, then it can be sent as multipart form data.
How to read or find out the files under a directory on the client machine?
Thnx in advance

It can be done using the File class used in Java. It can list out directories .
Several methods are available for inspecting an instance of the File class. Some of the important ones are:
Method                                                                                             Purpose
boolean exists()                                   does the file exist?
boolean isFile()                                    is it a file?
boolean isDirectory()                            � or a directory?
String[] list()                                       return the names of all files and directories in a directory
String getName()                                get the file or directory's name
String getPath()                                  get the file or directory's path
These methods are actually all we need in order to find all files and directories in a given directory--all the way down to the last leaves in the directory tree.

File system /oracle/SID/sapdata3 empty after EP 6.0 installation

Hi Friends
I'm installing EP 6.0 on WAS 6.40- SR1, AIX 5.1/Oracle 9.2.0 central system, where the Oracle database & the central instance are installed on the same host using the standard SAP DVD's, the installlation guide "SAP Web Application Server Java 6.40 SR1 on AIX: Oracle - Planning & Preparation" specifies creating 4 filesystems /oracle/SID/sapdata1,
/oracle/SID/sapdata2, /oracle/SID/sapdata3, /oracle/SID/sapdata4.
I created the 4 filesystems but notice that after completing the installation with portal up & running, filesystem /oracle/SID/sapdata3 is empty, with no directories & files created inside. Can anybody advice if this filesystem doesn't gets any files, then why SAP document asks to create this in 1st place.
Thanks & Rgds,
Abhishek

Hi Abhishek,
Kindly go through the sap note 972263, it clearly explains the file system required and the size.
SAP NetWeaver 2004s SR2 Java:
File System Name Space Requirement
/oracle/<DBSID>/sapdata1 1 GB
/oracle/<DBSID>/sapdata2 3 GB
/oracle/<DBSID>/sapdata3 - GB
/oracle/<DBSID>/sapdata4 6 GB
SUM 10 GB
Regards
Manjunath

How to Load 2 library files using System.loadLibrary in one .java file!!!

Hello,
Someone please help me. What I am trying to do is load two .DLL files in my program. Program works fine when I
do the following way i.e. I have two .java files and in each I am loading one .DLL file. But I don't want to have
two .java files I want to load both the .DLL files in one program.
**************** Example.java **********
import java.io.*;
import java.util.*;
public class Example
public native int A(String in);
static
System.loadLibrary( "API2" );
public static void main( String args[])
     Ex ex = new Ex();
     int r;
     r = ex.A("TEST");
public Example()
*****************Ex.java*****************
public class exsysml
public native int A(String in);
public exsysml()
System.loadLibrary("API3");
The above way works. But I need only one .java file to load both the .DLL files. i.e.
import java.io.*;
import java.util.*;
public class Example
public native int A(String in);
static
System.loadLibrary( "API2" );
System.loadLibrary( "API3" );
public static void main( String args[])
     Example ex = new Example();
     int r;
     r = ex.A("TEST");
public Example()
but when I do this way it doesn't work and I get a UnSatisfiedLinkage Error at ex.A("TEST"). While doing the top way it works.
How can I fix this to just have one .java file and load both the library files as done in the bottom program but doing this program doesn't work. Any help is appreciated.
Thanks!

what I figured out so far is that we can only load one library file in a single class and define all the native methods present in that library in the class where we are loading it. Means we can't load multiple library files in a single class. It's just my thought else if someone provides a better solution. I may be wrong so that's why I need your help.
Thanks

Java Card File System ...Please reply

Hi all ,
I am working on Java Card technology for last one year . Presently I am facing some problem regarding some file concept of java card .
I know that Java Card 2.1 does not support file system . But I want to simulate the file system in java card using applets . i.e . I want to write an application(applet) , which can simulate the EF , DF in smart card . Whenever APDU command is send to the file system applet , it should generate a Elementary file (EF) or dedicated file (DF) etc and store data to that file.
Can I do this type of thing using Java Card ? I am really in doubt .
If you have any idea on this , please let me know your view on this . If you know any open source code for this type of simulated Java card file system , please let me know .
I am desperately looking for a help .
regards
Dibyendu .
you can contact me to this email
[email protected]

dear duran ,
You have written that
"Follow the guidelines for the different supported filesystems on the JC"
But after Java Card version 2.0 , it does not support file system . I am using Java Card 2.1 .
Could please some sample code to my mail Id , so that I can take a look at it .
My mail id is : [email protected]
Please share the idea , as I am really need some help.
Regards ,
Dibyendu.

ECC6 EHP2 (ABAP+Java) system copy using file system copy

Hello Experts,
I have a question around system copy method for a dual stack ECC6 EHP2 system.
We are planning to take full file system backup of this entire ECC6 EHP2 dual stack system and throw it on a completely new hardware with new host name but same SID. We are also planning to do a host renaming in instance profiles and re-building the control files in target system after we finish the file system restore.
Is this method supported in SAP ? Or we strictly have to use SAPinst to do export and import method. In any case our source and target platform is not going to chance as per our scenario.
Any suggestions will be greatly appreciated.
Thanks,
Harshal

> Thanks for the quick response. Is their any document that says it is not supported ? Because of no proper document that says no to do it, client want's to try it out.
For the ABAP part this is certainly feasible.
The Java part has not only issues with the secure store but also with SID and hostname. The old values are stored in many places in the database and in, depending on the applications installed, many .properties files in the filesystem. So it would be not enough to somehow regenerate the secure store but also change hostname and SID in different places that are not really all documented.
What you are basically looking for is
Note 757692 - Changing the hostname for J2EE Engine 6.40/7.0 installation
with the significant sentence
This note should be applied only when the hostname of a machine
where the j2ee engine was already installed has changed.
It does not replace the SAP official system copy procedure and
MUST NOT be used for copying of an instance to another host and/or with different SID.
Markus

Java IO on top of a second file system layer

I have created a second file system on top of an existing file system, and I have java executing Java and Python(Jython) how would I get the IO they use to link to my file system and not the OS' file system?

Dennis56 wrote:
I have created a second file system on top of an existing file system, and I have java executing Java and Python(Jython) how would I get the IO they use to link to my file system and not the OS' file system?Huh?
Are you suggesting that you have created something like windows shared drives or windows condensed drives?
Because that is the only way you could create a IO system on "top" of an existing system. And if you have successfully done that then you do not need to do anything to java/python except 'point' them to the new location such as using a driver letter for a windows shared drive.
On the other hand if you have a bunch of java/python applications and you want to implement some other sort of file system then you would need to modify the virtual machines and the APIs of both of those.
And regardless all of the above WILL be a lot of work.
Now if you have some idea to implement a library that is useable (not replacement) for java/python apps then you
1. Create the library
2. Use the library
That solution requires a lot less work. Although certainly more than a trivial amount.

JAVA iso9660/UDF file system creation

Is there a class or utility in JAVA that will allow the creation of an iso9660 file system for CD's and/or the creation of a UDF file system for DVD's? I am looking for such a class to incorporate into an applcation that is currently under development, and would rather not have to write our own.
Thanks.

Is there a class or utility in JAVA that will allow the creation of an iso9660 file system for CD's and/or the creation of a UDF file system for DVD's? I am looking for such a class to incorporate into an applcation that is currently under development, and would rather not have to write our own.
Thanks.

Issues in Installing Web AS - Java [ FSL-02077 File system export (share)]

I have installed ABAP Web As - 2004s on my laptop.
I want to intall JAVA Web AS as well. How ever, when I try to install the JAVA Web AS,
It is failing with the following Error:
FSL-02077 File system export (share) saploc does not exist.
it happens after I agree the licence, enter the right JDk version and enter the Permissions file.
I am running on XP Home Edition,
No Fire walls running
No Anti Virus software [ infact I uninstalled it]
No Ports are in use [as per Pre Reqs]
User has the Administrator access
Any insights ... Please ...

Hi Vivek:
File system export (share) saploc does not exist
Means that the share is missing, one of the pre-installation steps is create the installation folders and the shares...
folder sap (<drive>:\usr\sap) must be shared as saploc and sapmnt
Hope this help
Juan
Please reward with points if helpful

How to design a file system based on java card

I have reviewed all kinds of articles about it.And right now I can not find any source code to do that function.But how to design a full gsm file system using java card.
of course you need fast access,dynamic allocate memory,file properties management.Let's talk about it.

just do it.
there is no such feature in the javacard api. This must be coded by hand, you have to manage memory, etc.
I know, that's not cool.

After Restoring/Backup of File System XI Java Instances are not up!

Hello all,
We are facing problem in restoring the SAP XI System, after taking backup of the system the java instances in SAP XI System are not starting again. ABAP connections are fine.
Can anyone provide suggestions/solutions in order to restore the XI System back.
The system information is as follows.
System Component: SAP NetWeaver 2004s, PI 7.0
Operating System: SunOS 5.9, SunOS 5.10
Database: ORACLE 9.2.0.
Regards,
Ketan Patel

If it´s REALLY a PI 7.0 (SAP_BASIS 700 and WebAS Java 7.00) then it´s not compatible. WebAS 7.00 needs Oracle 10g (http://service.sap.com/pam)
Also see
http://service.sap.com/nw2004s
--> Availibility
--> SAP NetWeaver 7.0 (2004s) PAM
If you open the Powerpoint, you will see that Oracle 9 is not listed. I wonder, how you got that installed.
Neverless, if you recover a Java instance, both filesystem and database content (of the Java schema) must be in sync, means, you need to restore both, database (schema) and filesystem, that have been backed up at the same time.
Check Java Backup and Restore :
Restoring the System
 1. Shut down the system.
 2. Install a new AS Java system using SAPInst, or restore the file system from the offline backups that you created.
 3. Import the database backup using the relevant tools provided by the database vendor.
 4. Overwrite the SAP system directory /usr/sap/.
 5. Start the system (see Starting and Stopping SAP NetWeaver ABAP and Java.)
The J2EE Engine is restored with the last backup.
Markus

After Restoring/Backup File System XI Java Instances are not up!

Hello all,
We are facing problem in restoring the SAP XI System, after taking backup of the system the java instances in SAP XI System are not starting again. ABAP connections are fine.
Can anyone provide suggestions/solutions in order to restore the XI System back.
The system information is as follows.
System Component: SAP NetWeaver 2004s, PI 7.0
Operating System: SunOS 5.9, SunOS 5.10
Database: ORACLE 9.2.0.
Regards,
Ketan Patel

I would correct Oracle version is 10.2.0
I would also like to reframe my problem.
XI server(both abap and Web) was working fine. Every weekend we take full backup(file system+DB)(UFS) of server. After taking backup server got up and we were able to login through abap but java web page was not openning. We did some troubleshooting it didn't work and finaly we restored the backup and somehow it worked. Next week after backup again same problem arose. We again restored latest backup but this time problem still exists.
Regards,
Ketan

[Java 7] Zip file system does not handle nested zip files

The ZIP FileSystem which is shipped as an extension with Java7 does not support nested ZIP files. I.e., you can open the outer zip file as a FileSystem, but if you try to open an inner zip as a FileSystem, you get this exception:
java.nio.file.ProviderNotFoundException: Provider not found
at java.nio.file.FileSystems.newFileSystem(FileSystems.java:403)Since the ZIP FileSystem is an extension, and not a part of the core JDK, I'm posting this here (and on Xueming's blog) in the hope that it will get resolved. It doesn't seem right to report it as a JDK bug.

872883 wrote:
The zip file system definitely allows zip entries to be read without extracting them first. And--based on reviewing the ZipFS source code that Oracle has included with the JDK--it doesn't appear to be silently extracting the data to a temporary file.you missed the point of what Peter Lawrey said. in order to create a ZipFS on a zip file, it must be a file in the first place (i.e. have random access). there is no way to do random access on an entry within an existing zip file, therefore in order to create a ZipFS on a nested zip file, you would first have to extract it to a file.

How to download a java class from database to file system

Hi All,
We have one invalid java class in database. We need to verify what is the functionality of this class. So we planned to download this class to file system. Then we need decompile it to source. But we are not able to identify the right command to download the java class from database.
Please suggest me if any possible ways to acheive this.
Thanks in advance....

http://www.sql.ru/forum/actualthread.aspx?tid=747308
http://download.oracle.com/docs/cd/B19306_01/java.102/b14187/appendixa.htm
PROCEDURE export_source(name VARCHAR2, schema VARCHAR2, blob BLOB)
PROCEDURE export_class(name VARCHAR2, schema VARCHAR2, blob BLOB)
PROCEDURE export_resource(name VARCHAR2, schema VARCHAR2, blob BLOB)
create table scott.t (id number, b blob);
declare
    b blob;
    begin
       dbms_lob.createTemporary(b, true, dbms_lob.CALL);
       dbms_java.export_class('sun/net/www/ParseUtil', user, b);
      dbms_output.put_line('length(b): '||length(b));
      insert into "SCOTT"."T" values(1,b);
    end;

Java File System

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