Servlets And JNI.. real urgent help.

Hi all,
I have the JNI code integrated to the servlet .The servlet works fine at first time.but when i modified some source code of servlet (not native library) and redeploy it,then reload the same servlet in web browser ,i get "Native library already loaded in another classloader java.lang.UnsatisfiedLinkError" error.
Any solution to this ???
Thanks
jetdvk

Have you fixed this?
I presume you are hot deploying the servlet ? if so then i also presume that you have either some static code or some run once code that loads your native code when your class is used for the first time.
This code is being ran again as the class is being reloaded, therefore you have two choices,
1) wrap the call loading the native library, and just ignore the exception. Then call a check method in the native code to make sure that the library was loaded.
2) Move the code that loads the native library out to another class that is not hot deployed. Your servlet can call this when it is first accessed, and the other class will know whether it has already loaded the dll and will not attempt to load it again.

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b font color ='red' Java JDBC and Oracle DB URGENT HELP PLEASE /font /b

Hello, I am a newbie. I'm very interested in Java in relation to JDBC, Oracle and SAP.I am trying to connect to an Oracle DB and I have problems to display the output on the consule in my application. What am I doing wrong here . Please help me. This is my code: Please Explain
import java.sql.*;
import java.sql.DriverManager;
import java.sql.Connection;
public class SqlConnection {
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          Class.forName("oracle.jdbc.driver.OracleDriver"); //Loading the Oracle Driver.
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          ResultSet rs = stmt.executeQuery("SELECT man,jean,test,kok FROM sa_kostl");
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               String man = rs.getString("1");
               String jean = rs.getString("2");
               String test = rs.getString("3");
               String kok = rs.getString("4");
               System.out.println( man, jean, test,kok );//here where my the
                                             //compiler gives me errors
          stmt.close();
          con.close();
}

<b><font color ='red'>Java JDBC and Oracle DB URGENT HELP PLEASE</font></b>Too bad your attempt at getting your subject to have greater attention failed :p

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[b]Java JDBC and Oracle DB URGENT HELP PLEASE[/b]

Hello, I am a newbie. I'm very interested in Java in relation to JDBC, Oracle and SAP.I am trying to connect to an Oracle DB and I have problems to display the output on the consule in my application. What am I doing wrong here . Please help me. This is my code: Please Explain
import java.sql.*;
import java.sql.DriverManager;
import java.sql.Connection;
public class SqlConnection {
public static void main(String[] args) {
Class.forName("oracle.jdbc.driver.OracleDriver"); //Loading the Oracle Driver.
Connection con = DriverManager.getConnection
("jdbc:orcle:thin:@34.218.5.3:1521:ruka","data","data"); //making the connection.
Statement stmt = con.createStatement ();// Sending a query to the database
ResultSet rs = stmt.executeQuery("SELECT man,jean,test,kok FROM sa_kostl");
while (rs.next()) {
String man = rs.getString("1");
String jean = rs.getString("2");
String test = rs.getString("3");
String kok = rs.getString("4");
System.out.println( man, jean, test,kok );//here where my the
//compiler gives me errors
stmt.close();
con.close();
}

Hello, I am a newbie. I'm very interested in Java in
relation to JDBC, Oracle and SAP.I am trying to
connect to an Oracle DB and I have problems to
display the output on the consule in my application.
What am I doing wrong here . Please help me. This is
my code: Please Explain
import java.sql.*;
import java.sql.DriverManager; <--- Why do you have these (java.sql.* is enough)
import java.sql.Connection;
public class SqlConnection {
public static void main(String[] args) {// Where's the try/catch block?
>
Class.forName("oracle.jdbc.driver.OracleDriver");
//Loading the Oracle Driver.
Connection con = DriverManager.getConnection
("jdbc:orcle:thin:@34.218.5.3:1521:ruka","data","data"
); //making the connection.
Statement stmt = con.createStatement ();// Sending a
query to the database
ResultSet rs = stmt.executeQuery("SELECT
man,jean,test,kok FROM sa_kostl");
while (rs.next()) {
String man = rs.getString("1");
String jean = rs.getString("2");
String test = rs.getString("3");
String kok = rs.getString("4");
System.out.println( man, jean, test,kok );//here
where my the
//compiler gives me errors
stmt.close();
con.close();
}The compiler is probably complaining about the lack of a try/catch block.
The fact that you can't understand the compiler messages, and didn't read the javadocs enough to know that you needed a try/catch block, suggest to me that you need to learn a lot more about Java. This is pretty fundamental stuff.
When you have problems, it's best to include information about what the compiler or runtime is telling. Error messages and stack traces are helpful.
In your case the error is so elementary that more information isn't necessary.
%

Servlet and JNI

Hi,
I have a servlet which uses jni to call a dll. I have my servlet in weblogic server 6.1
Whenever i access this servlet i get the foll. error(java.lang.UnsatisfiedLinkError):
<Error> <HTTP> <[WebAppServletContext(5602251,Defa
ultWebApp,/DefaultWebApp)] Servlet failed with Exception
java.lang.UnsatisfiedLinkError: call
at ISAPIServ.call(Native Method)
at ISAPIServ.doGet(ISAPIServ.java:11)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubIm
pl.java:265)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubIm
pl.java:200)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppSe
rvletContext.java:2495)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestIm
pl.java:2204)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:139)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)
>
I have my dll in the wlserver6.1\bin folder and have the path set properly.
Can anybody help??
Thanx in advance.
-Prabha.

there can be several problems:
1. the JVM did not load the dll.
(a). the DLL was not in the the path and the JVM could not locate the file in the path.
This does not seem to be the error, coz in this case the error would have been
Exception in thread "main" java.lang.UnsatisfiedLinkError: no ATLFireJNIRaper in
java.library.path
at java.lang.ClassLoader.loadLibrary(Unknown Source)
at java.lang.Runtime.loadLibrary0(Unknown Source)
at java.lang.System.loadLibrary(Unknown Source)
at ATLFire.<clinit>(ATLFire.java:17)
(b). problem with the DLL name: I hope you used a System.loadLibrary("MyNativeCode"); //where dll's name is MyNativeCode.dll
This too does not seem to be the problem. Follows from (a)
(c) you forgot to call the System.loadLibrary("MyNativeCode") ; function -- likely the error
2. The native method, called "call" I guess, is not there at all in th DLL that the JVM loaded.
this too may be an error.
Please check if this indeed is the case.
I hope there is a corrosponding
JNIEXPORT Java_packageName_className_methodName(..) there in the C++ code that u extended.
Please go thru this check list and see if you are able to find the bug. If not, can u mail me the Java and the native code?
At least try this:
public class MyTestClass {
static
System.loadLibrary("MyDLL");
public native RETURN_TYPE call(list, of, arguments);
public static void main(String args[])
MyTestClass oMyTestClass = new MyTestClass();
RETURN_TYPE retval = oMyTestClass.call(pass, the, args, here...);
System.out.println("the function returned " + retval);
I hope this class will help you unit test your dll and native method.
Please let me know if this solves your problem.
Also, I'd like to know the reason for going for a native method.
Is it coz of a bottleneck ? Or is to reuse some native code/ dll/ COM component?
I am open for all discussions regarding JNI, Java, VC++ etc.
I can be reached at [email protected]
cheers

Servlets and JNI

Hi,
We have a C library which does financial computations and some of our customers have expressed the need to access our library from their servlets.
This is why we have developed a JNI wrapper which encapsulates all functionality of our library.
Now, do the specs allow using JNI in conjunction with servlets? I've studied the Java EE, JSP and servlet specs but JNI isn't mentioned anywhere...
I've also found this thread with a quite similar question but without a clear answer whether it's allowed or not.
-- Vincent

yes, if the server's security policy allows it. In a basic server environment you can do just about anything you can do in a regular java application.

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SQL> select * from dept ;
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2 from emp a, dept b
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RotoProne wrote:
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On to more interesting things :)
You can do the matrix, but are out of luck with a 5000 x 5000 table because Oracle only allows 1000 columns per table. There are ways to work around this.
How do do the matrix depends on what you want to do. You can do this different ways. You can create a table beforehand and use PL/SQL or simple SQL to populate it, or use the CREATE TABLE AS syntax to create and populate it in one step if you can get the underlying SQL to work the way you want, something like
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Your urgent help will be very much appreciated

I have a problem whenever I connect my database and need your urgent help. the sample source code is below
import java.sql.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
public class Table extends JFrame
private Connection con;
private JTable table;
public Table()
     String url = "jdbc:odbc:Books";
     String username="";
     String password="";
     try{
     Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
     con = DriverManager.getConnection(url, username, password);
     catch(ClassNotFoundException cnfex)
     System.err.println("Failed to load JDBC/ODBC driver.");
     cnfex.printStackTrace();
     System.exit(1);
     catch(SQLException sqlex)
     System.err.println("Failed to connect");
     sqlex.printStackTrace();
     getTable();
     setSize(45,150);
     show();
public void getTable()
     Statement state;
     ResultSet result;
     try{
     String query="Select * from Author";
     state=con.createStatement();
     result=state.executeQuery(query);
     displayResult(result);
     state.close();
     catch(SQLException sqlex)
     sqlex.printStackTrace();
public void displayResult(ResultSet rs)throws SQLException
boolean moreRecord=rs.next();
if (!moreRecord)
JOptionPane.showMessageDialog(this, "ResultSet contained no record");
setTitle("No records to display");
return;
setTitle("Author table from Books");
Vector columnHeads=new Vector();
Vector rows=new Vector();
try{
ResultSetMetaData rsmd=rs.getMetaData();
for (int i=1; i<=rsmd.getColumnCount(); i++)
columnHeads.addElement(rsmd.getColumnName(i));
do{
rows.addElement(getNextRow(rs, rsmd));
}while(rs.next());
table=new JTable(rows, columnHeads);
JScrollPane scroller=new JScrollPane(table);
getContentPane().add(scroller,BorderLayout.CENTER);
validate();
catch(SQLException sqlex)
sqlex.printStackTrace();
public Vector getNextRow(ResultSet rs, ResultSetMetaData rsmd)
          throws SQLException
Vector currentRow=new Vector();
for (int i=1; i<=rsmd.getColumnCount(); i++)
switch (rsmd.getColumnType(i))
case Types.VARCHAR:
     currentRow.addElement(rs.getString(i));
     break;
     case Types.INTEGER:
     currentRow.addElement(new Long(rs.getLong(i)));
     break;
default:
System.out.println("Type was: "+rsmd.getColumnTypeName(i));
return currentRow;
public void shutDown()
     try{
     con.close();
     catch(SQLException sqlex)
     System.err.println("Unable to disconnect");
     sqlex.printStackTrace();
public static void main(String args[])
     final Table app=new Table();
     app.addWindowListener( new WindowAdapter()
     public void windowClosing(WindowEvent e)
          app.shutDown();
          System.exit(0);

Thank you for your help. When I compile it, it is fine, the problem happens when run it.
Unexpected Signal : EXCEPTION_ACCESS_VIOLATION occurred at PC=0x6d448d54
Function name=(N/A)
Library=C:\Program Files\JavaSoft\JRE\1.3.1_05\bin\hotspot\jvm.dll
NOTE: We are unable to locate the function name symbol for the error
just occurred. Please refer to release documentation for possible
reason and solutions.
Current Java thread:
at sun.jdbc.odbc.JdbcOdbc.driverConnect(Native Method)
at sun.jdbc.odbc.JdbcOdbc.SQLDriverConnect(Unknown Source)
at sun.jdbc.odbc.JdbcOdbcConnection.initialize(Unknown Source)
at sun.jdbc.odbc.JdbcOdbcDriver.connect(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at Table.<init>(Table.java:26)
at Table.main(Table.java:145)
Dynamic libraries:
0x00400000 - 0x00405000 C:\WINNT\system32\java.exe
0x77F80000 - 0x77FFB000 C:\WINNT\System32\ntdll.dll
0x77D90000 - 0x77DED000 C:\WINNT\system32\ADVAPI32.dll
0x77E60000 - 0x77F35000 C:\WINNT\system32\KERNEL32.DLL
0x786F0000 - 0x78761000 C:\WINNT\system32\RPCRT4.DLL
0x78000000 - 0x78046000 C:\WINNT\system32\MSVCRT.dll
0x60000000 - 0x6003A000 c:\program files\rising\rav\ApiHook.dll
0x05000000 - 0x0502E000 c:\program files\rising\rav\MemMon.dll
0x77DF0000 - 0x77E55000 C:\WINNT\system32\USER32.dll
0x77F40000 - 0x77F7C000 C:\WINNT\system32\GDI32.DLL
0x75E00000 - 0x75E1A000 C:\WINNT\System32\IMM32.DLL
0x6D420000 - 0x6D4F7000 C:\Program Files\JavaSoft\JRE\1.3.1_05\bin\hotsp
ot\jvm.dll
0x77530000 - 0x77560000 C:\WINNT\system32\WINMM.dll
0x6D220000 - 0x6D227000 C:\Program Files\JavaSoft\JRE\1.3.1_05\bin\hpi.d
ll
0x6D3B0000 - 0x6D3BD000 C:\Program Files\JavaSoft\JRE\1.3.1_05\bin\verif
y.dll
0x6D250000 - 0x6D266000 C:\Program Files\JavaSoft\JRE\1.3.1_05\bin\java.
dll
0x6D3C0000 - 0x6D3CD000 C:\Program Files\JavaSoft\JRE\1.3.1_05\bin\zip.d
ll
0x6D020000 - 0x6D12A000 C:\Program Files\JavaSoft\JRE\1.3.1_05\bin\awt.d
ll
0x777C0000 - 0x777DE000 C:\WINNT\system32\WINSPOOL.DRV
0x75010000 - 0x75020000 C:\WINNT\system32\MPR.DLL
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0x6D1E0000 - 0x6D21B000 C:\Program Files\JavaSoft\JRE\1.3.1_05\bin\fontm
anager.dll
0x6DD30000 - 0x6DD36000 C:\WINNT\System32\INDICDLL.dll
0x37210000 - 0x3723D000 C:\WINNT\DOWNLO~1\CnsMin.dll
0x77C50000 - 0x77C9A000 C:\WINNT\system32\SHLWAPI.dll
0x777E0000 - 0x777E7000 C:\WINNT\system32\VERSION.dll
0x75950000 - 0x75956000 C:\WINNT\system32\LZ32.DLL
0x6D290000 - 0x6D29A000 C:\Program Files\JavaSoft\JRE\1.3.1_05\bin\JdbcO
dbc.dll
0x1F7F0000 - 0x1F825000 C:\WINNT\system32\ODBC32.dll
0x76AF0000 - 0x76B2D000 C:\WINNT\system32\comdlg32.dll
0x77B30000 - 0x77BB9000 C:\WINNT\system32\COMCTL32.DLL
0x78F90000 - 0x791D6000 C:\WINNT\system32\SHELL32.DLL
0x1F8E0000 - 0x1F8F6000 C:\WINNT\system32\odbcint.dll
0x77900000 - 0x77923000 C:\WINNT\system32\imagehlp.dll
0x72960000 - 0x7298D000 C:\WINNT\system32\DBGHELP.dll
0x687E0000 - 0x687EB000 C:\WINNT\system32\PSAPI.DLL
Local Time = Tue Feb 25 21:33:38 2003
Elapsed Time = 7
# HotSpot Virtual Machine Error : EXCEPTION_ACCESS_VIOLATION
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# Please report this error at
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URGENT.........File Upload using Servlets and jsp

I am a new servlet programmer.......
iam using tomcat server......
can any one pls help in writing code for file upload using servlets and jsp without using multipart class or any other class like that....
Please URGENT..

Slow down! "Urgent" is from your perspective alone. I, myself, am not troubled or worried in the least.
hi ugniss
thanks for ur reply....sorry i was not
y i was not asked not to use multipart class or any
other class like that...is there any other
possibility to do file uploading from jsp to
servlet...
Just as an aside, a JSP is a Servlet. But even if I move beyond that, the question does not make sense. If you want a "JSP to upload to a Servlet", then simply do so in memory. You are still (likely) within the same scope of a given request. However, if instead you are referring to a JSP that is displayed on a browser, then really you are talking about HTML, which is what the browser will receive. And since you are now talking about a browser, your only real, viable option is a multi-part file upload. So, it is either server or it is browser. And either way, the question leads to very established options, as outlined above.
the main concept is.. in the browser the user selects
a particular file and clicks the button upload..after
clicking upload the jsp should sent the file to the
servlet in streams...there the servlet gets in and
saves in a server location........this is wat i hav
to do...
Okay. So, after reading my previous (redundant) paragraph, we have arrived at the crux of the issue. You have a JSP that will be output as HTML to a client (browser) which you want to upload content to your server (handled by a Servlet). So, you are now stuck again with multi-part. The requirement to not use multi-part is non-sensical. You can overcome it, say, if you write your own applet or standalone Swing client. However, if your users are invoking this functionality from a browser, you are limited by the options that W3C has provided you. Use multi-part.
is there aby possibilty to do this.....can any one
pls help....Take the advice to download and review Jakarta Commons FileUpload. Inform your management that their requirement makes no technical sense. Research on your own. There are dozens of examples (and tutorials) on file upload using multi-part. Embrace it. Live it. Love it.
- Saish

Servlets And JNI.. real urgent help.

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