Dealing with functions not in class Object

Hi,
while i was working on GJ i faced the following problem, when i write a generic class i have to take into my consideration those functions that i want to define for the row type class and not included in class Object (toSting() is in class Object but print() is not). of course every time i want to call print() from the generic class the compiler gives me an error becuz it is not in class Object.. is there anyway to get rid of this problem in a simple way without having to deal with more than one row type ?
thanks everyone

I think I see what you're getting at...the GJ compiler substitues Object for all unconstrained type parameters, and therefore tries to call methods on parametized type objects as if they were simply of type Object.
A solution would be to create a base class (or interface) AbstractRow that declares all the methods you need. Then constrain your parameters against AbstractRow. Eg:
public interface AbstractRow
public AbstractRow rowMethod();
public class MyClass<RowType extends AbstractRow>
public RowType doSomething(RowType rt) {
rt.rowMethod();
I think that should work. I'm not sure what you meant by "without having to deal with more than one row type." If you meant "without having to introduce an inheritance hierarchy," then no, this is not possible in GJ (as far as I can tell). If you meant "without having to write adapters for every single row type," then yes.
shaun

Similar Messages

[svn:bz-trunk] 18821: Check-in a minor fix that deals with a missing MessageBroker class ( this could happen in Java/Android clients).

Revision: 18821
Revision: 18821
Author:   [email protected]
Date:     2010-11-26 07:33:24 -0800 (Fri, 26 Nov 2010)
Log Message:
Check-in a minor fix that deals with a missing MessageBroker class (this could happen in Java/Android clients).
Modified Paths:
    blazeds/trunk/modules/core/src/flex/messaging/MessageException.java

I see some message about a proxy. Have you checked that you can use the proxy from you network?
If not you should turn the proxy off.
Timo

Problem with Dynamically accessing EJB Class objects in WL 7.0 SP1

I am trying to build a component which has the ability to instantiate and execute
an known EJB method on the fly.
I have managed to build the component but when I try and execute it I get a ClassNotFoundException.
I know that the EJB I am trying to invoke is deployed and available on the server,
as I can see it in the console, I also seen to have been able to get the remote
interface of the object, my problem occurs when I try and access the class object
so I can perform a create on the object and then execute my method
The code I have written is below:
private Object getRemoteObject(Context pCtx, String pJNDIName, String pHomeBean)
throws Exception {
     String homeCreate = "create";
     Class []homeCreateParam = { };
     Object []homeCreateParamValues = {};
try {
//This call seems to work and doesn't throw an exception
Object home = pCtx.lookup(pJNDIName);
//However this call throws a java.lang.ClassNotFoundException
Class homeBean = Class.forName(pHomeBean);
Method homeCreateMethod = homeBean.getMethod(homeCreate,homeCreateParam);
return homeCreateMethod.invoke(home, homeCreateParamValues);
} catch (NamingException ne) {
logStandardErrorMessage("The client was unable to lookup the EJBHome.
Please make sure ");
logStandardErrorMessage("that you have deployed the ejb with the JNDI
name "+pJNDIName+" on the WebLogic server ");
throw ne;
} catch (Exception e) {
logStandardErrorMessage(e.toString());
throw e;
Any advice would be really appreciated, I'm fast running out of ideas, I suspect
it has something to do with the class loader but I'm not sure how to resolve it
Regards
Jo Corless

Hello Joanne,
Congratulations! I'm very happy that you've managed to fix your problem. It's
always essential to understand how to package applications when deploying on BEA
WebLogic. Usually, by throwing everything into an EAR file solves just about all
the class loader problems. :-) Let us know if you have any further problems that
we can assist you with.
Best regards,
Ryan LeCompte
[email protected]
http://www.louisiana.edu/~rml7669
"Joanne Corless" <[email protected]> wrote:
>
>
I've fixed it!!!!!!!!
Thanks to everyone who gave me help!!!!
The class loader was the culprit which is what I suspected all along.
As soon
as I put the 2 jar files I was using into an EAR file the problem went
away!!!!!
Thanks again
Jo Corless
"Ryan LeCompte" <[email protected]> wrote:
Hello Joanne,
As Mr. Woollen mentioned, I also believe it's a problem with the class
loader.
You need to be careful how you arrange your EJBs, because WebLogic has
a specific
method in which it loads classes in an EAR, JAR, and WAR file(s). Please
refer
to http://dev2dev.bea.com/articles/musser.jsp for more information about
BEA WebLogic
class loading mechanisms and caveats. Also, try printing out the various
methods
that are available on the object that was returned to you via reflection.
For
example, use the getMethods() method, which returns an array of Method
objects
that you can subsequently cycle through and print out the various method
names.
This way you can discover if the class found/returned to you is indeed
the one
you intend to locate.
Hope this helps,
Ryan LeCompte
[email protected]
http://www.louisiana.edu/~rml7669
Rob Woollen <[email protected]> wrote:
I believe the issue is the home interface class for this EJB is not
available in the class loader which is doing the reflection.
If you do:
getClass().getClassLoader().loadClass(homeInterfaceClassName)
I suspect it will fail. Reflection still requires that the class be
loadable.
-- Rob
Joanne Corless wrote:
Hi Slava,
If I make my code look like you describe below I get a compliationerror telling
me that
home.getMethod() is not recognised (no such method)
If I change it slightly and use
Method homeCreateMethod =
home.getClass().getMethod(homeCreate,homeCreateParam);
The code will compile OK but when executed it still throws a NoSuchMethodException
Any ideas ?
Thanks for your help so far
Regards
Jo Corless
Your code should look like
Object home = pCtx.lookup(pJNDIName);
Method homeCreateMethod =
home.getMethod(homeCreate,homeCreateParam);
return homeCreateMethod.invoke(home, homeCreateParamValues);
Regards,
Slava Imeshev
"Joanne Corless" <[email protected]> wrote in message
news:[email protected]...
Hi Ryan,
I also wanted to mention that if you do a "header search" in this
particular
newsgroup
with the search query as "reflection", you will see many previousmessages
regarding
reflection and EJBs. I believe you could learn a lot from thedifficulties
that
others have faced and solved.I tried that and although there was a number of similar cases noneof them
actually
seem to fix my issue. Thanks for the suggestion though
Are the EJBs that you are trying to access accessible via your
system
classpath?
Try to avoid having them accessible via the main system classpath,and
only bundle
them in your appropriate EJB jar files (contained in an EAR file,for
example).Maybe I should have laid the problem out a little clearer.
I have a number of EJB's bundled up in a JAR file which is hot deployedto
the
server. Within this first JAR file is an EJB (SSB) component that
needs
to
be
able to invoke a known method on another EJB. This second EJB may
or
may
not be
within the first JAR file but it also will be hot deployed.
The component trying to invoke the method on the 2nd EJB has to
be
able to
create
an instance of the 2nd EJB without actually knowing anything bar
a
JNDI
Name which
is passed in at runtime.
I can get as far as doing the
Object home = pCtx.lookup(pJNDIName);
This returned a class with the name
"com.csc.edc.projects.allders.httppostoffice.postman.PostmanBean_mp8qy2_Home
Impl_WLStub"
My problem seems to occur when I try and invoke the create method
Method homeCreate = home.getClass().getMethod("create", new Class[0]);
My code throws a java.lang.NoSuchMethodException at this point so
I
am
unable
to progress to the next step of :
Object bean = homeCreate.invoke(home, null);
So I can return the instantiated bean back to the calling client.
Why am I getting the NoSuchMethodException, is is because I am gettinga
stub
back rather than the home interface and if so how do I get the truehome
interface
from the bean
Thanks in advance
Jo Corless

How to deal with '$' sign in the class name?

I want to put my Java Applet game on my homepage. But the server which I set up my homepage doesn't support the file name like XXX$XXX.class, which has '$' sign in the file name. Would anyone can tell me how to deal with this problem? And how can I make the game work on my homepage? Thanks.

Don't forget, this include both concrete inner classes as well as any anonymous inner classes you create, like
myButton.addActionListener(new ActionListener()
// Yada Yada Yada

How to print Field name with value of a Class object?

hi, In C#, I need to print a class field or property name with value without using reflection or string.join method.
For eg.
protected void Button1_Click(object sender, EventArgs e)
List<EmployeeInfo> obj = new List<EmployeeInfo>();
obj.Add(new EmployeeInfo { eid = 123 });
obj.Add(new EmployeeInfo { ename = "abc" });
Response.Write(obj.ToString()); // output must be => ename ="abc" , eid = 123
public class EmployeeInfo
public string ename;
public int eid;
It need to be resulted as follows automatically with property name and value :
ename ="abc" , eid = 123
It need to be resulted with good performance and simple way.

You could override ToString method in EmployeeInfo class:
public class EmployeeInfo
public string ename;
public int eid;
public override string ToString()
return string.Format("ename =\"{0}\" , eid = \"{1}\"", ename, eid);
protected void Button1_Click(object sender, EventArgs e)
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Function not returning table object correctly

Instead of returning a table, my function is returning this:
SCHEMA_OWNER.TBL_SUMS([SCHEMA_OWNER.SUMS_OBJ])
Does anyone see a syntax error in my function or the ddl of my table and object types?
This is a stripped down, simplified version of my function:
create or replace FUNCTION "F_TEST" (p_skey number, p_start_date date, p_end_date date)
RETURN tbl_sums
IS
tmp_A NUMBER;
tmp_B NUMBER;
l_tbl tbl_sums := tbl_sums();
BEGIN
SELECT SUM(FieldA), SUM(FieldB)
into tmpA, tmpB
from myTable where SKEY = p_skey
and DATE_VALUE >= p_start_date
and DATE_VALUE < p_end_date;
l_tbl.extend;
l_tbl(l_tbl.count()) := sums_obj(p_start_date, p_end_date, p_skey, tmpA, tmpB);
return l_tbl;
END;
My types are:
create or replace type sums_obj is object (start_date DATE, end_date DATE, skey NUMBER, SumA NUMBER, SumB NUMBER);
create or replace type tbl_sums is table of sums_obj;
Thanks!

>
RETURN tbl_kpi
>
What is 'tbl_kpi'? That isn't defined anywhere. Your original post said this:
>
RETURN tbl_sums
>
We can't help you if you don't post what you are really using. Cut & Paste is ok but you have to paste the correct code.
Your funtion is returning a TABLE but it is NOT PIPELINED. So if you query the function from DUAL you will get a DATASET as the result.
If you query the function AS A TABLE you will get the 'contents' of the table.
If you make your function a PIPELINED function then you use PIPE ROW to return each row but the function is still declared to return a TABLE. Maybe that is what is confusing you.
Try the following sample code to see what the difference is.
Here are two SQL types based on the EMP table in the scott schema.
-- type to match emp record
create or replace type emp_scalar_type as object
(EMPNO NUMBER(4) ,
   ENAME VARCHAR2(10),
   JOB VARCHAR2(9),
   MGR NUMBER(4),
   HIREDATE DATE,
   SAL NUMBER(7, 2),
   COMM NUMBER(7, 2),
   DEPTNO NUMBER(2)
-- table of emp records
create or replace type emp_table_type as table of emp_scalar_type
/Now - here is a function (similar to yours) that returns that EMP_TABLE_TYPE. NOTE: the function IS NOT PIPELINED
CREATE OR REPLACE function SCOTT.get_emp1( p_deptno in number )
return emp_table_type
as
tb emp_table_type;
BEGIN
select emp_scalar_type(empno, ename, job, mgr, hiredate, sal, comm, deptno)
    bulk collect into tb from emp where deptno = p_deptno;
return tb;
end;
/If I just select the function itself from DUAL I get this:
select get_emp1(20) from dual
GET_EMP1(20)
(DATASET)I can use TOAD or sql developer to examine that dataset and see the records.
But I can actually query the records by using the TABLE function:
select * from table(get_emp1(20))
EMPNO     ENAME     JOB     MGR     HIREDATE     SAL     COMM     DEPTNO
7369     SMITH     CLERK     7902     12/17/1980     800          20
7566     JONES     MANAGER     7839     4/2/1981     2975          20
7788     SCOTT     ANALYST     7566     4/19/1987     3000          20
7876     ADAMS     CLERK     7788     5/23/1987     1100          20
7902     FORD     ANALYST     7566     12/3/1981     3000          20This is a similar function. It returns the same EMP_TABLE_TYPE but it is a PIPELINED function.
-- pipelined function
create or replace function get_emp( p_deptno in number )
return emp_table_type
PIPELINED
as
   TYPE EmpCurTyp IS REF CURSOR RETURN emp%ROWTYPE;
    emp_cv EmpCurTyp;
    l_rec emp%rowtype;
begin
    open emp_cv for select * from emp where deptno = p_deptno;
    loop
      fetch emp_cv into l_rec;
      exit when (emp_cv%notfound);
      pipe row( emp_scalar_type( l_rec.empno, LOWER(l_rec.ename),
          l_rec.job, l_rec.mgr, l_rec.hiredate, l_rec.sal, l_rec.comm, l_rec.deptno ) );
    end loop;
    return;
end;
/The ONLY way I can query this function is by using the TABLE function:
select * from table(get_emp(20))
EMPNO     ENAME     JOB     MGR     HIREDATE     SAL     COMM     DEPTNO
7369     smith     CLERK     7902     12/17/1980     800          20
7566     jones     MANAGER     7839     4/2/1981     2975          20
7788     scott     ANALYST     7566     4/19/1987     3000          20
7876     adams     CLERK     7788     5/23/1987     1100          20
7902     ford     ANALYST     7566     12/3/1981     3000          20The query of the PIPELINED function is the same and the result set is the same.
The difference is that the PIPELINED function returns ONE ROW at a time and does NOT need to accumulate a lot of data in a collection before returning it. That collection uses expensive PGA memory and the more data you have the more memory it uses.
Your function (and my similar one) doesn't return ANY data until it has produced ALL of it. And it uses that expensive PGA memory. What is the point of creating your collection one row at a time and waiting until you have it all before you return it?
You could easily modify your function and add PIPELINED to the declaration. Then use the PIPE ROW clause to return each row as it is produced. That will eliminate the need for the collection (and memory) within the function.
You can also then chain the function calls together if you need to.
See 'Using Pipelined and Parallel Table Functions' in the Data Cartridge Developer's Guide
http://docs.oracle.com/cd/B28359_01/appdev.111/b28425/pipe_paral_tbl.htm
There is little use for your function that is not pipelined but returns a table type unless you were storing that table-type in an object column of a table.
There are many uses for PIPELINED functions.

Help with dynamic creation of class object names

Hi all
Wonder if you can help. I have a class player.java. I want to be able to create objects from this class depending on a int counter variable.
So, for example,
int counter = 1;
Player p+counter = new Player ("Sam","Smith");the counter increments by 1 each time the method this sits within is called. The syntax for Player name creation is incorrect. What I am looking to create is Player p1, Player p2, Player p3.... depending on value of i.
Basically I think this is just a question of syntax, but I can't quite get there.
Please help if you can.
Thanks.
Sam

here is the method:
//add member
public void addMember() {
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    boolean isMember=true;
    this.memberCounter++;
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How do I deal with things not working in PS CC?

I need some advise in how to troubleshoot various difficulties.
Last time I used Photoshop was like over many years ago like in version 2 or somewhere close to it and I am running into problems with it.
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It seems like most tutorials are geared for CS6.
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How to deal with the rule that do not use "object" class to declear a class

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Check out this example:
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import javax.swing.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
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private JComboBox box1;
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box1 .setPreferredSize(new Dimension(300, 24));
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f.setSize(400, 150);
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How do I deal with a Java method which returns a class object?

Hi, I am using JNI to talk to some Java code from c++;
I have a java method in class B that is defined as
class B{
A[] As;
A getA(int i){
return As(i);
where A is one of my classes.
I would like to know the code to deal with a returned object of type A and then how to access the variables in A from c++.
I have defined my method pointer as :
env->GetMethodID(B, "getA", "(I)A;");and have the jclass object of type A.
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ilganeli wrote:
Thanks but this doesn't really help. I know how this is done in Java (see below).Presumably you also understand how that code will fail. At least based on what you have posted here.
I do not understand the syntax to do the equivalent thing in JNI, specifically, how to cast the returned object from the CallObjectMethod function to be of the appropriate type, namely A, and then how to access those fields. You don't cast it. Didn't do so in your java code either.
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Calling a function in another class that is not the App delegate nor a sngl

Hi all-
OK- I have searched and read and searched, however I cannot figure out an easy way to call a function in another class if that class is not the app delegate (I have that down) nor a singleton (done that also- but too much code)
If you use the method Rick posted:
MainView *myMainView = [[MainView alloc] init];
[MyMainView goTell];
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Thanks!

I had some trouble wrapping my head around this stuff at first too.
I've gotten pretty good at letting my objects communicate with one another, however I don't think my method is the most efficient or organized way but I'll try to explain the basic idea.
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//WorkClass.h
@import "MainView.h"
@interface WorkClass : NSObject
MainView *myPointerToTheMainView;
@property (retain) myPointerToTheMainView;
-(void)tellMainViewHello;
@end
//WorkClass.m
@import "WorkClass.h"
@implementation WorkClass
@synthesize myPointerToTheMainView;//this makes getter and setter functions for
//the pointer and allows us to use the dot
//syntax to refrence it.
-(void)tellMainViewHello
[myPointerToTheMainView hello]; //sends a message to the main view
//assume the class MainView has defined a
//method -(void)hello
@end
now somewhere in the app delegate you would make the WorkClass instance and pass it a reference to the MainView class so that WorkClass would be able to call it's say hello method, and have the method go where you want (to the single instance of MainView owned by the app-delegate)
ex:
//somewhere in app-delegate's initialization
//assume MainView *theMainView exists and is instantiated.
WorkClass *myWorkClass = [[WorkClass alloc] init];
myWorkClass.myPointerToTheMainView = theMainView; //now myWorkClass can speak with
// the main view through it's
// reference to it
I hope that gets the basic idea across.
I'm pretty new to Obj-c myself so if I made any mistakes or if anyone has a better way to go about this please feel free to add
Message was edited by: kodafox

Dealing with abstract classes and interfaces with XMLBeans

I'm quite new to XMLBeans and would like some help. I've got things working when
you are only saving concreate classes as XML, but when it comes to clesses containing
interfaces I am running into problems.
I basically have a collection of XY objects (see below) that I want to save as
XML.
I want to convert the following java classes to an xml schema:
public class XY{
X x;
Y y;
public interface X{
void setA(int a);
int getA();
public interface Y{
void setB(int b);
int getB();
public class X1 implements X{
void setA(int a);
int getA();
//other data to save
public class X2 implements X{
void setA(int a);
int getA();
//other data to save
public class Y1 implements Y{
void setB(int b);
int getB();
//other data to save
public class Y2 implements Y{
void setB(int b);
int getB();
//other data to save
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all the XMLBeans documentation, but it doesn't say anything about dealing with
interfaces/abstract classes. Is there anywhere else to look?
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Anurag,
What I really wanted was a work-around to using substiutionGroups as substitution
groups are not supported in this release.
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<xsd:complexType name="PublicationType">
<xsd:sequence>
<xsd:element name="Title" type="xsd:string"/>
<xsd:element name="Author" type="xsd:string" minOccurs="0" maxOccurs="unbounded"/>
<xsd:element name="Date" type="xsd:gYear"/>
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="BookType">
<xsd:complexContent>
<xsd:extension base="PublicationType" >
<xsd:sequence>
<xsd:element name="ISBN" type="xsd:string"/>
<xsd:element name="Publisher" type="xsd:string"/>
</xsd:sequence>
</xsd:extension>
</xsd:complexContent>
</xsd:complexType>
<xsd:complexType name="MagazineType">
<xsd:complexContent>
<xsd:restriction base="PublicationType">
<xsd:sequence>
<xsd:element name="Title" type="xsd:string"/>
<xsd:element name="Date" type="xsd:gYear"/>
</xsd:sequence>
</xsd:restriction>
</xsd:complexContent>
</xsd:complexType>
<xsd:element name="Publication" type="PublicationType"/>
<xsd:element name="Book" substitutionGroup="Publication" type="BookType"/>
<xsd:element name="Magazine" substitutionGroup="Publication" type="MagazineType"/>
<xsd:element name="BookStore">
<xsd:complexType>
<xsd:sequence>
<xsd:element ref="Publication" maxOccurs="unbounded"/>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
to produce an XML file like:
<?xml version="1.0"?>
<BookStore ¡Ä>
<Book>
<Title>Illusions: The Adventures of a Reluctant Messiah</Title>
<Author>Richard Bach</Author>
<Date>1977</Date>
<ISBN>0-440-34319-4</ISBN>
<Publisher>Dell Publishing Co.</Publisher>
</Book>
<Magazine>
<Title>Natural Health</Title>
<Date>1999</Date>
</Magazine>
<Book>
<Title>The First and Last Freedom</Title>
<Author>J. Krishnamurti</Author>
<Date>1954</Date>
<ISBN>0-06-064831-7</ISBN>
<Publisher>Harper & Row</Publisher>
</Book>
</BookStore>
What is the best way to do this without using substitution types?
Thanks,
Andrew
"Anurag" <[email protected]> wrote:
Andrew,
Could you please paste/attach a sample of the code you are using to convert
Java bean classes to XMLBeans?
In the current release the goal of XMLBeans technology was to convert
from
XML Schemas or XML files to XMLBeans. The focus was not towards conversion
of Java beans to XMLBeans.
Regards,
Anurag
"Andrew" <[email protected]> wrote in message news:[email protected]...
I'm quite new to XMLBeans and would like some help. I've got thingsworking when
you are only saving concreate classes as XML, but when it comes toclesses
containing
interfaces I am running into problems.
I basically have a collection of XY objects (see below) that I wantto
save as
XML.
I want to convert the following java classes to an xml schema:
public class XY{
X x;
Y y;
public interface X{
void setA(int a);
int getA();
public interface Y{
void setB(int b);
int getB();
public class X1 implements X{
void setA(int a);
int getA();
//other data to save
public class X2 implements X{
void setA(int a);
int getA();
//other data to save
public class Y1 implements Y{
void setB(int b);
int getB();
//other data to save
public class Y2 implements Y{
void setB(int b);
int getB();
//other data to save
What would be the best way to convert these to XML Schema? I've lookedthrough
all the XMLBeans documentation, but it doesn't say anything about dealingwith
interfaces/abstract classes. Is there anywhere else to look?
Thanks in advance,
Andrew

Class type 022 is not defined for object for BATMAS

Hi Experts,
while creaitng the LSMW for batch classification,I faced the error during IDOC processing as "Class type 022 is not defined for object".I am using
Business Object      BUS1001002
Method               SAVEREPLICA
Message Type         BATMAS
Basic Type           BATMAS03
Pleas guide how to resolve the error.
Also ,as I intend to make LSMW for batch classifications.Is this the correct way.
Please guide on this also.
Regards.

Hello Jass,
Symptom
The BATMAS03 basis type (message type BATMAS) /FB BAPI_BATCH_REPLICATE cannot transfer any classification information. Please review note 1070634.
First Option :
You should first transfer the batmas and then the clfmas idoc.
Second Option :
You could create the batch together with classification. Normally the problem is the missing CUOBJ_BM in table MCH1. It is not necessary in all situations that the field have to be filled, but it can be in some cases (And it is better to store the right information in the corresponding fields). Especially when you transfer batch/classification information in other system the field have to be filled.
The way to create the batch TOGETHER with classification by using BATMAS IDOC is to set the following parameters correctly :-
set E1BPBATCHCTRL-DOCLASSIFY to X and fill the segments with relevant classification information
E1BP3060_ALLOCATION
E1BP3060_VALUATION_CHAR
E1BP3060_VALUATION_CURR
E1BP3060_VALUATION_NUM
In this case the field mch1-cuobj_bm should be filled with correct CUOBJ. You can also use function module BAPI_BATCH_SAVE_REPLICA to create batches together with classification.
Hope this information helps
Regards
Amber

JNI to access functions of a dll to deal with a data aquision pci card

i am trying to do an applicattion to access the functions of a dll
to deal with a data aquision pci card (Analogig/Digital pci card).
i�m using jni of course, but i have some problems.
first i did a class called "TesteDll" witch contains all the native methods to access the functions of the pci card.
after, i did a "TesteDll.jar" to use these methods in another applicattions.
everything was fine until there. so created a single program like this:
TesteDll td = new TesteDll();
short res1 = td.P1602_DriverInit(wTotalBoards);
short r = td.P1602_ActiveBoard((short)0); // ativa a placa
short res2 = td.P1602_GetConfigAddressSpace((short)0,wAddrTimer,wAddrCtrl,wAddrDio,wAddrAdda);
int dwRepeat;
for(dwRepeat=0 ; dwRepeat<100 ; dwRepeat++)
short wRetVal;
wRetVal = td.P1602_ClearScan();
wRetVal += td.P1602_AddToScan((short)0,(short)0,(short)1,(short)0,(short)0,(short)0);     // CH:0 to scan
wRetVal += td.P1602_SaveScan((short)0,wV0);
wRetVal += td.P1602_AddToScan((short)2,(short)0,(short)1,(short)0,(short)0,(short)0);     // CH:2 to scan
/* ->error here!*/ wRetVal += td.P1602_SaveScan((short)1,wV2);
the programs compile correctly, but in the execution the folowing error was descripted:
An unexpected exception has been detected in native code outside the VM.
Unexpected Signal : EXCEPTION_ACCESS_VIOLATION (0xc0000005) occurred at PC=0x8079A50
Function=[Unknown.]
Library=(N/A)
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 TesteDll.P1602_SaveScan(Native Method)
at Teste2.main(Teste2.java:119)
Dynamic libraries:
0x7CD80000 - 0x7CD9D000      C:\WINDOWS\SYSTEM\IMAGEHLP.DLL
Heap at VM Abort:
Heap
def new generation total 576K, used 161K [0x10010000, 0x100b0000, 0x104f0000)
eden space 512K, 31% used [0x10010000, 0x100385c0, 0x10090000)
from space 64K, 0% used [0x10090000, 0x10090000, 0x100a0000)
to space 64K, 0% used [0x100a0000, 0x100a0000, 0x100b0000)
tenured generation total 1408K, used 0K [0x104f0000, 0x10650000, 0x14010000)
the space 1408K, 0% used [0x104f0000, 0x104f0000, 0x104f0200, 0x10650000)
compacting perm gen total 4096K, used 1044K [0x14010000, 0x14410000, 0x18010000)
the space 4096K, 25% used [0x14010000, 0x141152e8, 0x14115400, 0x14410000)
Local Time = Wed Jun 01 10:21:14 2005
Elapsed Time = 0
# The exception above was detected in native code outside the VM
# Java VM: Java HotSpot(TM) Client VM (1.4.2_06-b03 mixed mode)
functions like "P1602_DriverInit(wTotalBoards)","P1602_ActiveBoard((short)0)" functions correctly.
i run the same program in c++ builder and everythings goes fine, but i need to do it in java. i don�t know what to do,can you help me?
thanks

i almost forgot, i�m using win 98.
First i used Dev C++ to make the JNI dll and the error ocurred at the first call of "P1602_AddToScan()" function. after i made the jni dll using C++ Builder, and the error ocurred at the second call of "P1602_SaveScan()" function. but the error message in both cases was the same.
for(dwRepeat=0 ; dwRepeat<100 ; dwRepeat++)
short wRetVal;
wRetVal = td.P1602_ClearScan();
/*First Error - Dev C++*/ wRetVal += td.P1602_AddToScan((short)0,(short)0,(short)1,(short)0,(short)0,(short)0); // CH:0 to scan
wRetVal += td.P1602_SaveScan((short)0,wV0);
wRetVal += td.P1602_AddToScan((short)2,(short)0,(short)1,(short)0,(short)0,(short)0); // CH:2 to scan
/* Second error C++ Builder */ wRetVal += td.P1602_SaveScan((short)1,wV2);
...

How to call a Derived call fucntion with a base class object ?

Hi all
i am working on a JNI interface to Java, and in the process of simulating a C++ behaviour in java
so i need some help form you people, in this regard.
here is a c++ code, i need a equivalent fucntionality in java , to put it one word, the question is
how to implement the dynamic_cast functionality in java, as java also has virtual fucntions, i think
this should be possible, if it is not, what is the alternative
class Base
public:
     Base()
     ~Base()
     virtual void F1()
          cout<<"The BASE::F1() is called"<<endl;
     virtual void F2()
          cout<<"The BASE::F2() is called"<<endl;
class Derived : public Base
public:
     Derived()
     ~Derived()
     virtual void F3()
          cout<<"The Derived::F3() is called"<<endl;
     virtual void F4()
          cout<<"The Derived::F4() is called"<<endl;
Base * GetDerived()
     return new Derived();
int _tmain(int argc, _TCHAR* argv[])
     Base *ptr = NULL;
                ptr = GetDerived();
     Derived *dPtr = dynamic_cast<Derived *>(ptr);
                dPtr->F3();
}regards
pradish

Just to clarify a point that I consider important--the distinction between references and objects:
Your subject is: How to call a Derived call fucntion with a base class object ? The answer to that is: You cannot. It is completely impossible in Java. If you have a base class object, the derivced class' methods are not present. On the other hand, if you have a compile-time reference of the parent type, but at runtime it happens to point to an instance of the derived class, then, as pointed out, you can cast the reference. (Note that casting does not apply to objects.)

Dealing with functions not in class Object

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