Replace Java Class?

Hi to all of yours.
Standard Java classes, like File, OutputStream and such and such, are included in every Java distribution.
I have a .jar library which uses them, for example FileOutputStream. I load this library with an URLClassLoader.
What I want to achive is that the library uses a class defined by myself instead of FileOutputStream. This class will have the same signature and methods, of course.
This sounds strange, but consider the following: the library I use (3rd party) creates a pile of files with stuff in them on the hard disk. However, I dont want these files to be on the hd, but in memory instead. Therefore I created some sort of "virtual file system" with streams and all sorts of gimicks.
I dont want to replace FileOutputStream permanently, just within the ClassLoader used to load that jar.
First idea was to override the loadClass method to return my class whenever "java.io.FileOutputStream" is requested.
Well, this works for normal classes, but these "basic" java classes (as I said, like File, FileOutputStream and so on..) are not requested from the classloader but somehow already "known".
Can someone either tell me how to achieve my goal of replacing them dynamically or at least point me some links where i can get information on how the class-retrieving process of the "basic" java classes is done or could be influenced?
Thanks a million,
Thomas.

Hey
You need to add a parameter to exchange profile before you can see ABAP-class in Interface mapping,please follow the below steps:
Go to http://<host:port>/exchangeProfile in internet explorer
Expand IntegrationBuilder ->IntegrationBuilder.Repository->click on com.sap.aii.repository.mapping.additionaltypes link ,then on right hand side just type
R3_ABAP|Abap-class in i/o field. and save.
You may need to restart Java engine for this take effect.
Thanks
Aamir
Edited by: Aamir Suhail on Aug 5, 2009 1:02 PM
Edited by: Aamir Suhail on Aug 5, 2009 1:02 PM

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hi,
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/people/michal.krawczyk2/blog/2007/04/26/xipi-throwing-generic-exceptions-from-any-type-of-mapping
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Edited by: Aamir Suhail on Aug 5, 2009 1:02 PM

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Edited by: NTbc on 13.07.2010 15:36
Edited by: NTbc on 13.07.2010 15:36

CallableStatement =
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create or replace and compile java source named "my.App" as
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create or replace
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2 lexzeus, mlk:
I understood you.
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import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
import oracle.sql.*;
import oracle.jdbc.*;
import java.sql.*;
import java.io.*;
public class XXVM_ZipFileUtil_Ela
public static oracle.sql.BLOB getZipFile(
oracle.sql.CHAR zipFilePathCHAR, oracle.sql.CHAR zipFileNameCHAR,
int fileBufferSize, int zipFileBufferSize,
boolean deleteZipFile, java.sql.Array fileNames, java.sql.Array fileContents, java.sql.Array fileContentsLength)
throws IllegalArgumentException, FileNotFoundException, IOException, java.sql.SQLException
String zipFilePath = (zipFilePathCHAR == null) ? null : zipFilePathCHAR.stringValue();
String zipFileName = (zipFileNameCHAR == null) ? null : zipFileNameCHAR.stringValue();
String zipPathAndFileName = new String(
new String(zipFilePath == null || zipFilePath == "" ? "/tmp/" : zipFilePath) +
new String(zipFileName == null || zipFileName == "" ? System.currentTimeMillis() + ".zip" : zipFileName));
byte[] buffer = new byte[fileBufferSize == 0 ? 100000000 : fileBufferSize];
try
Connection conn = DriverManager.getConnection("jdbc:default:connection:");
oracle.sql.CLOB[] fileContentsCLOB = (oracle.sql.CLOB[])fileContents.getArray();
String[] fileNamesString = (String[])fileNames.getArray();
BigDecimal[] fileContentsLengthNumber = (BigDecimal[])fileContentsLength.getArray();
ZipOutputStream zipOut = new ZipOutputStream(new FileOutputStream(zipPathAndFileName));
zipOut.setLevel(Deflater.DEFAULT_COMPRESSION);
for (int i = 0; i < fileNamesString.length; i++) {
System.out.println(i);
zipOut.putNextEntry(new ZipEntry(fileNamesString));
InputStream asciiStream = fileContentsCLOB[i].getAsciiStream(1L);
int asciiReadCount = asciiStream.read(buffer,0,fileContentsLengthNumber[i].intValue());
zipOut.write(buffer, 0, fileContentsLengthNumber[i].intValue());
zipOut.closeEntry();
zipOut.close();
byte zipFileContents[] = new byte[zipFileBufferSize == 0 ? 100000000 : zipFileBufferSize];
FileInputStream zipIn = new FileInputStream(zipPathAndFileName);
int byteCount = zipIn.read(zipFileContents);
zipIn.close();
byte returnFileContents[] = new byte[byteCount];
System.arraycopy(zipFileContents,0,returnFileContents,0,byteCount);
String returnFileContentsString = new String(returnFileContents);
if (deleteZipFile)
boolean deletedFile = (new File(zipPathAndFileName)).delete();
oracle.sql.BLOB returnFileContentsBLOB = null;
returnFileContentsBLOB = BLOB.createTemporary(conn, true, BLOB.DURATION_SESSION);
returnFileContentsBLOB.open(BLOB.MODE_READWRITE);
//OutputStream tempBlobWriter = returnFileContentsBLOB.getBinaryOutputStream();
OutputStream tempBlobWriter = returnFileContentsBLOB.setBinaryStream(1);
tempBlobWriter.write(returnFileContents);
tempBlobWriter.flush();
tempBlobWriter.close();
returnFileContentsBLOB.close();
return returnFileContentsBLOB;
catch (IllegalArgumentException ex) {
ex.printStackTrace();
throw ex;
catch (FileNotFoundException ex) {
ex.printStackTrace();
throw ex;
catch (IOException ex)
ex.printStackTrace();
throw ex;
catch (java.sql.SQLException ex)
ex.printStackTrace();
throw ex;

860411 wrote:
Hi Team,
I am unable to compile the java class in the SQL PLUS in dev1 and dev2. It is giving the following error.
But the same class get Compiled in the Toad(Tool) without any error and working fine. Could someone help me
What to do for this for your reference ,Attaching the java class file.
“ORA-29536: badly formed source: Encountered "<EOF>" at line 1, column 28.
Was expecting one of:
I believe the error message is clear and self-explanatory.
----------------------Here is the Java class Code.....................
create or replace and compile java source named "XXVM_ZipFileUtil_Ela"
as
import java.math.BigDecimal;
import java.util.zip.Deflater;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
import oracle.sql.*;
import oracle.jdbc.*;
import java.sql.*;
import java.io.*;
public class XXVM_ZipFileUtil_Ela
public static oracle.sql.BLOB getZipFile(
oracle.sql.CHAR zipFilePathCHAR, oracle.sql.CHAR zipFileNameCHAR,
int fileBufferSize, int zipFileBufferSize,
boolean deleteZipFile, java.sql.Array fileNames, java.sql.Array fileContents, java.sql.Array fileContentsLength)
throws IllegalArgumentException, FileNotFoundException, IOException, java.sql.SQLException
String zipFilePath = (zipFilePathCHAR == null) ? null : zipFilePathCHAR.stringValue();
String zipFileName = (zipFileNameCHAR == null) ? null : zipFileNameCHAR.stringValue();
String zipPathAndFileName = new String(
new String(zipFilePath == null || zipFilePath == "" ? "/tmp/" : zipFilePath) +
new String(zipFileName == null || zipFileName == "" ? System.currentTimeMillis() + ".zip" : zipFileName));
byte[] buffer = new byte[fileBufferSize == 0 ? 100000000 : fileBufferSize];
try
Connection conn = DriverManager.getConnection("jdbc:default:connection:");
oracle.sql.CLOB[] fileContentsCLOB = (oracle.sql.CLOB[])fileContents.getArray();
String[] fileNamesString = (String[])fileNames.getArray();
BigDecimal[] fileContentsLengthNumber = (BigDecimal[])fileContentsLength.getArray();
ZipOutputStream zipOut = new ZipOutputStream(new FileOutputStream(zipPathAndFileName));
zipOut.setLevel(Deflater.DEFAULT_COMPRESSION);
for (int i = 0; i < fileNamesString.length; i++) {
System.out.println(i);
zipOut.putNextEntry(new ZipEntry(fileNamesString));
InputStream asciiStream = fileContentsCLOB[i].getAsciiStream(1L);
int asciiReadCount = asciiStream.read(buffer,0,fileContentsLengthNumber[i].intValue());
zipOut.write(buffer, 0, fileContentsLengthNumber[i].intValue());
zipOut.closeEntry();
zipOut.close();
byte zipFileContents[] = new byte[zipFileBufferSize == 0 ? 100000000 : zipFileBufferSize];
FileInputStream zipIn = new FileInputStream(zipPathAndFileName);
int byteCount = zipIn.read(zipFileContents);
zipIn.close();
byte returnFileContents[] = new byte[byteCount];
System.arraycopy(zipFileContents,0,returnFileContents,0,byteCount);
String returnFileContentsString = new String(returnFileContents);
if (deleteZipFile)
boolean deletedFile = (new File(zipPathAndFileName)).delete();
oracle.sql.BLOB returnFileContentsBLOB = null;
returnFileContentsBLOB = BLOB.createTemporary(conn, true, BLOB.DURATION_SESSION);
returnFileContentsBLOB.open(BLOB.MODE_READWRITE);
//OutputStream tempBlobWriter = returnFileContentsBLOB.getBinaryOutputStream();
OutputStream tempBlobWriter = returnFileContentsBLOB.setBinaryStream(1);
tempBlobWriter.write(returnFileContents);
tempBlobWriter.flush();
tempBlobWriter.close();
returnFileContentsBLOB.close();
return returnFileContentsBLOB;
catch (IllegalArgumentException ex) {
ex.printStackTrace();
throw ex;
catch (FileNotFoundException ex) {
ex.printStackTrace();
throw ex;
catch (IOException ex)
ex.printStackTrace();
throw ex;
catch (java.sql.SQLException ex)
ex.printStackTrace();
throw ex;
The last two lines above should be
/Srini

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