Null Reference when zooming on hidden detail data.

This is really weird. I have users that have reported this error: "An unhandled exception of type 'System.NullReferenceException' occured in CrystalDecision.Windows.Forms.dll". I got some data from them and started playing around.
The report is an embedded report on vs2010 using crystal 2010 for vs sp1. The report is built off a dataset.xsd that I created from the data. The weird thing is that I can un-hide the details and zoom to the sub report for the section called "Resulting XML" just fine. But if I hide the details and try to zoom to the sub report, it crashes every time.
Any Ideas?
Edited by: Don Williams on Apr 19, 2011 12:49 PM

Schema:
<?xml version="1.0" encoding="utf-8"?>
<xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="root">
 <xs:complexType>
 <xs:sequence>
 <xs:element maxOccurs="unbounded" name="RecordType">
 <xs:complexType>
 <xs:sequence>
 <xs:element maxOccurs="unbounded" name="Error">
 <xs:complexType>
 <xs:sequence>
 <xs:element name="ErrorCategory" type="xs:string" />
 <xs:element name="ErrorNumber" type="xs:unsignedByte" />
 <xs:element name="ErrMsg" type="xs:string" />
 <xs:element name="DataCode" type="xs:string" />
 <xs:element minOccurs="0" name="RecordNumber" type="xs:unsignedByte" />
 </xs:sequence>
 </xs:complexType>
 </xs:element>
 </xs:sequence>
 <xs:attribute name="ID" type="xs:unsignedShort" use="required" />
 <xs:attribute name="ImportID" type="xs:string" use="required" />
 <xs:attribute name="Data" type="xs:string" use="required" />
 </xs:complexType>
 </xs:element>
 </xs:sequence>
 </xs:complexType>
</xs:element>
</xs:schema>
Sample Data:
<?xml version="1.0" encoding="utf-8"?>
<root>
<RecordType ID="0" ImportID="" Data="C:\Users\isemane\AppData\Roaming\Microsoft Corporation\Microsoft Dynamics GP\11.00.0221.000\_0.xml">
 <Error>
 <ErrorCategory />
 <ErrorNumber>0</ErrorNumber>
 <ErrMsg></ErrMsg>
 <DataCode></DataCode>
 </Error>
 </RecordType>
<RecordType ID="22115" ImportID="ETH PRIMARY PAY" Data="C:\Users\isemane\AppData\Roaming\Microsoft Corporation\Microsoft Dynamics GP\11.00.0221.000\ETH PRIMARY PAY_22115.xml">
 <Error>
 <ErrorCategory>Imported Records</ErrorCategory>
 <ErrorNumber>0</ErrorNumber>
 <ErrMsg>Record number :1 Imported</ErrMsg>
 <DataCode>POPRCTNM: RCT0001559909</DataCode>
 <RecordNumber>1</RecordNumber>
 </Error>
 <Error>
 <ErrorCategory>impPurchaseReceipts</ErrorCategory>
 <ErrorNumber>4</ErrorNumber>
 <ErrMsg>Microsoft.Dynamics.GP.eConnect.eConnectException: Sql procedure error codes returned:</ErrMsg>
 <DataCode>POPRCTNM: RCT0001559910</DataCode>
 <RecordNumber>2</RecordNumber>
 </Error>
 <Error>
 <ErrorCategory>Imported Records</ErrorCategory>
 <ErrorNumber>0</ErrorNumber>
 <ErrMsg>Record number :3 Imported</ErrMsg>
 <DataCode>POPRCTNM: RCT0001559911</DataCode>
 <RecordNumber>3</RecordNumber>
 </Error>
 <Error>
 <ErrorCategory>Imported Records</ErrorCategory>
 <ErrorNumber>0</ErrorNumber>
 <ErrMsg>Record number :4 Imported</ErrMsg>
 <DataCode>POPRCTNM: RCT0001559912</DataCode>
 <RecordNumber>4</RecordNumber>
 </Error>
 <Error>
 <ErrorCategory>impPurchaseReceipts</ErrorCategory>
 <ErrorNumber>4</ErrorNumber>
 <ErrMsg>Microsoft.Dynamics.GP.eConnect.eConnectException: Sql procedure error codes returned:</ErrMsg>
 <DataCode>POPRCTNM: RCT0001559913</DataCode>
 <RecordNumber>5</RecordNumber>
 </Error>
 <Error>
 <ErrorCategory>Imported Records</ErrorCategory>
 <ErrorNumber>0</ErrorNumber>
 <ErrMsg>Record number :6 Imported</ErrMsg>
 <DataCode>POPRCTNM: RCT0001559914</DataCode>
 <RecordNumber>6</RecordNumber>
 </Error>
 <Error>
 <ErrorCategory>Imported Records</ErrorCategory>
 <ErrorNumber>0</ErrorNumber>
 <ErrMsg>Record number :7 Imported</ErrMsg>
 <DataCode>POPRCTNM: RCT0001559915</DataCode>
 <RecordNumber>7</RecordNumber>
 </Error>
 <Error>
 <ErrorCategory>Resulting XML</ErrorCategory>
 <ErrorNumber>0</ErrorNumber>
 <ErrMsg>Start Time for impPurchaseReceipts: 4/18/2011 6:14:47 PM
End Time: 4/18/2011 6:17:42 PM
Elapsed Time: 0:3:54.2538
Records imported:5
Errors Found:2</ErrMsg>
 <DataCode>Import Results:Purchase Receipts</DataCode>
 </Error>
</RecordType>
</root>
I load the data with the following code:<turns out this little editor doesn't like to cut and paste vb code, so I'll link it.>
[source code for load of xml|http://pastebin.com/k2At4pBC]

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Yes do have the creationComplete event for the ComboBoxes...you can make use of it and give it a try....
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Please help me with this, I have put a trigger on a table but it can not work as I expect.
case study: one class has many students, only one of them goes to match.
The purpose of this trigger is to check when choose a student goes to match, this student must in his class where he belongs to.
Version of Oracle is 10.2.0.1.0.
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create table CLASS(
CID     VARCHAR2(5)   PRIMARY KEY,
CNAME   VARCHAR2(20) NOT NULL,
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SID     VARCHAR2(5)   PRIMARY KEY,
SNAME   VARCHAR2(20) NOT NULL,
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DUMMY INTEGER;
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/Just copy and paste above and try to run following:
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Clearly,you can not choose student which is 3 as match member of class 1. Please help me. Thanks.
Edited by: 991096 on 01-Mar-2013 02:36
Edited by: 991096 on 01-Mar-2013 03:03
Edited by: 991096 on 01-Mar-2013 03:11

Hi,
Welcome to the forum!
Like the others, I can't see a business purpose for this trigger. I assume it's just an experiment to learn how triggers work.
991096 wrote:
Please help me with this, I have put a trigger on a table but it can not be triggered.Sorry, I don't understand what you want help with.
Are you saying the trigger doesn't fire? It does fire; it just raises the mutating table error, so you don't see anything.
case study: one class has many students, only one of them goes to match.What do you mean when you say "goes to match"?
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DROP TABLE STU;
DROP TABLE CLASS;
create table CLASS(
CID VARCHAR2(5) PRIMARY KEY,
CNAME VARCHAR2(20) NOT NULL,
SCHOSEN VARCHAR2(5));
create table STU(
SID VARCHAR2(5) PRIMARY KEY,
SNAME VARCHAR2(20) NOT NULL,
CID VARCHAR2(5) NOT NULL REFERENCES CLASS(CID) ON DELETE CASCADE);
--data:
--CLASS
INSERT INTO CLASS(CID,CNAME) VALUES(1,'SUN');
INSERT INTO CLASS(CID,CNAME) VALUES(2,'MOON');
INSERT INTO CLASS(CID,CNAME) VALUES(3,'EARTH');
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INSERT INTO STU VALUES(1,'JACK',1);
INSERT INTO STU VALUES(2,'TOM',1);
INSERT INTO STU VALUES(3,'LILY',2);
INSERT INTO STU VALUES(4,'DUSTIN',3);
--TRIGGER
CREATE OR REPLACE TRIGGER CHECK_SCHOSEN
BEFORE INSERT OR UPDATE OF SCHOSEN ON CLASS
FOR EACH ROW WHEN (NEW.SCHOSEN IS NOT NULL)
DECLARE
DUMMY INTEGER;
INVALID_STU EXCEPTION;
VALID_STU EXCEPTION;
MUTATING_TABLE EXCEPTION;
PRAGMA EXCEPTION_INIT(MUTATING_TABLE, -4091);
CURSOR DUMMY_CURSOR (ST VARCHAR2, CL VARCHAR2) IS
SELECT SID FROM STU, CLASS
WHERE STU.SID=ST AND STU.CID=CLASS.CID AND CLASS.CID=CL
FOR UPDATE OF CLASS.SCHOSEN;
BEGIN
OPEN DUMMY_CURSOR(:NEW.SCHOSEN, :NEW.CID);
FETCH DUMMY_CURSOR INTO DUMMY;
IF DUMMY_CURSOR%NOTFOUND THEN
RAISE INVALID_STU;
ELSE
RAISE VALID_STU;
END IF;
CLOSE DUMMY_CURSOR;
EXCEPTION
WHEN INVALID_STU THEN
CLOSE DUMMY_CURSOR;
DBMS_OUTPUT.PUT_LINE('PLEASE RE-ENTER CLASS ID AND STUDENT ID AS CLASS OR STUDENT IS NOT VALID.');
WHEN VALID_STU THEN
CLOSE DUMMY_CURSOR;
DBMS_OUTPUT.PUT_LINE('STUDENT CHOOSE SUCCEFULLY!');
WHEN MUTATING_TABLE THEN
NULL;
END;
/Thanks for posting the CREATE TABLE, INSERT and CREATE TRIGGER statements; that really helps!
See the forum FAQ {message:id=9360002} for other helpful tips, such as how to use \ tags to post formatted code.
Just copy and paste above and try to run following:
UPDATE CLASS
SET SCHOSEN=3
WHERE CID=1;
Clearly,you can not choose student which is 3 as match member of class 1. The trigger did not be triggered. Please help me. Thanks.You can't do DML, or even query, the class table from a FOR EACH ROW trigger on the same class table.
Add 3 more calls to put_line to see this:CREATE OR REPLACE TRIGGER CHECK_SCHOSEN
BEFORE INSERT OR UPDATE OF SCHOSEN ON CLASS
FOR EACH ROW WHEN (NEW.SCHOSEN IS NOT NULL)
DECLARE
DUMMY          INTEGER;
INVALID_STU      EXCEPTION;
VALID_STU          EXCEPTION;
MUTATING_TABLE      EXCEPTION;
PRAGMA           EXCEPTION_INIT (MUTATING_TABLE, -4091);
CURSOR DUMMY_CURSOR (ST VARCHAR2, CL VARCHAR2) IS
SELECT SID
     FROM      STU
     ,     CLASS
     WHERE     STU.SID          = ST
     AND     STU.CID          = CLASS.CID
     AND     CLASS.CID     = CL
     FOR UPDATE OF           CLASS.SCHOSEN;
BEGIN
dbms_output.put_line (:NEW.schosen || ' = schosen entering check_schosen');     -- ***** NEW *****
OPEN DUMMY_CURSOR (:NEW.SCHOSEN, :NEW.CID);
dbms_output.put_line ('Cursor is open now.');     -- ***** NEW *****
FETCH DUMMY_CURSOR INTO DUMMY;
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RAISE VALID_STU;
END IF;
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WHEN INVALID_STU THEN
CLOSE DUMMY_CURSOR;
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WHEN VALID_STU THEN
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WHEN MUTATING_TABLE THEN
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Output, when trying to UPDATE class:3 = schosen entering check_schosen
MUTATING TABLE
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Obviously, the trigger fired, since you see the message "3 = schosen entering check_schosen"
Obviously, the OPEN statement raised an error, since you don't see the message 'Cursor is open now.'
Obviously, the mutating table error was raised, since you see the message 'MUTATING TABLE'.
So the trigger fired, and went to the EXCEPTION handler almost immediately. The EXCEPTION handler printed a message, as instructed, and the trigger ended. Then the actual UPDATE took place.
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Select 'GENOA-ITGOA' , '7','J508343', 'SABYA', '14/2/15' Union All
Select 'GENOA-ITGOA2' , '7','J508418', 'SABYA', '14/2/15' Union All
Select 'GENOA-ITGOA2' , '7','J508342', 'SUDAIR', '14/2/15' Union All
Select 'GENOA-ITGOA2' , '7','J508343', 'SUDAIR', '14/2/15' Union All
Select 'GENOA-ITGOA' , '8','J508418', 'SUDAIR', '20/2/15' Union All
Select 'GENOA-ITGOA' , '8','J508606', 'JAZAN', '20/2/15' Union All
Select 'GENOA-ITGOA' , '8','J508607', 'JAZAN', '20/2/15' Union All
Select 'GENOA-ITGOA2' , '8','J508608', 'JAZAN', '20/2/15' Union All
Select 'GENOA-ITGOA2' , '8','J509006', 'HANJIN ELIZABETH', '20/2/15' Union All
Select 'GENOA-ITGOA' , '8','J509007', 'HANJIN ELIZABETH', '20/2/15' Union All
Select 'GENOA-ITGOA' , '8','J509129', 'HANJIN MALTA', '20/2/15' Union All
Select 'GENOA-ITGOA2' , '10','J509130', 'HANJIN MALTA', '7/3/15' Union All
Select 'GENOA-ITGOA2' , '10','J509326', 'SUDAIR', '7/3/15' Union All
Select 'GENOA-ITGOA' , '10','J509327', 'SUDAIR', '7/3/15'
Select * from SampleTable
ASP.Net, C#.Net, SQL Server ,Win32

Regarding detail data coming in a grid in a PO Report

Hi
I have a requirement where in the detail data need to be printed in a grid. I have placed this in the jfmain page and all the subforms in the next page.
when i run the report for multiple purchase order numbers the grid is not coming from the second Purchase order number but the data is coming correctly.
I am using ^eject for page break after each PO related data.
Can any one help me in this regard.
TIA
vijay
[email protected]

Hi abilash n
as in dictionary, all quantity fields should have a reference to the unit field which then defines the number of decimals.
The rest is done automatically as long as you do it standard way. In field catalog you have to set the fcat-qfieldname to the name of the field that has the unit.
If you do so, also totals will be grouped by unit.
SAP has really done a great thing by inventing units for quantities (and currency keys for currency amounts). Only developers do not understand and thus refuse to use it.
Regards,
Clemens

Detailed Data Structure of ReFS file system in context of Forensic analysis

Hi
Please explain detailed Data Structure of ReFS file system in context of Forensic analysis ?
Regards

Hi，
I am not expert about this, this page links to ReFS resources that include Microsoft documentation
As of today, ReFS is only available in Windows Server 2012 and ReFS is expected to be part of the flagship Windows desktop OS.
Resilient File System Overview
https://technet.microsoft.com/en-us/library/hh831724.aspx?f=255&MSPPError=-2147217396
Improve File Server Data Resiliency with ReFS in Windows Server 2012
http://blogs.technet.com/b/keithmayer/archive/2012/10/15/refs-in-windows-server-2012.aspx#.Ug0MvpLksaQ
Windows Server 2012: Does ReFS replace NTFS? When should I use it?
http://blogs.technet.com/b/askpfeplat/archive/2013/01/02/windows-server-2012-does-refs-replace-ntfs-when-should-i-use-it.aspx
Resilient file system, MSDN reference
https://msdn.microsoft.com/en-us/library/windows/desktop/hh848060%28v=vs.85%29.aspx?f=255&MSPPError=-2147217396
forensic images of ReFS volumes, and data structures.
http://www.williballenthin.com/forensics/refs/
Please note: Since the website is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.
Regards
D. Wu
Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact [email protected]

Dereferencing of the NULL reference

Hi,
I have created an a form view with a value node "ZINVOICE" , i have written few lines of code to set the collection,
create object lr_col
    type
      cl_crm_bol_bo_col.
   create data lr_tabline.
   ls_favs-PROCESS = 'mahe'.
   ls_favs-SERTYPE = 'SRVR'.
   create object lr_valuenode
      exporting
        iv_data_ref = lr_tabline.
lr_valuenode->set_properties( ls_favs ).
lr_col->add( lr_valuenode ).
set collection
me->zinvoice->set_collection( lr_col ).
After this the node "ZINVOICE" has the collection ref and entity list shows the entity as well,
But still wen i try to test the view it gives errors saying
Cannot display view ZCNODE_INST/ZWASL of UI Component ZCNODE_INST
An exception has occurred Exception Class CX_SY_REF_IS_INITIAL - Dereferencing of the NULL reference
BSP Application: ZCNODE_INST
View Layout: ZWASL.htm
Method: CL_O2D8A1MNCT9O5WAN3TF3CDQNNQY=>_ONLAYOUT
Source Text Row: 42
can somebody help me with this,

Hi Mannif,
I am not including this view in any component as an AB, when i include in any other standard component it does work fine. The problem is when i try to run it as a stand alone component. I am trying to set the collection of the contect node. I tried the same for a model node with bol entity "BuilHeader". I set the collection using "CL_CRM_bol_query_services", and it worked fine.
try.
query ?= cl_crm_bol_dquery_service=>get_instance( iv_query_name = 'BuilHeaderAdvancedSearch' ).
catch cx_sy_no_handler.
endtry.
CALL METHOD QUERY->add_selection_param
EXPORTING
iv_attr_name = 'PARTNER'
iv_sign = 'I'
iv_option = 'EQ'
iv_low = '*'.
*get query result*
col = QUERY->get_query_result( ).
CALL METHOD me->BP->SET_COLLECTION
EXPORTING
    COLLECTION                    = col
By the same logic is not working for a value node.

Access via NULL reference object not possible

Hi friends,
I have created an wda application which uses the table popin to display data.
So that i have created a view with two of the fields as link to action UI element.
In the Events/Actions of the link to action element i implemented the following logic.
data wd_table_cell_editor type ref to cl_Wd_view_element.
data wd_table_column type ref to cl_wd_table_column.
data wd_popin type ref to cl_wd_table_popin.
data id type string.
 wd_table_cell_editor ?= wd_this->m_view->get_element( id ).
wd_table_column ?= wd_table_cell_editor->get__parent( ).
wd_popin = wd_table_column->get_popin( ).
context_element->set_attribute( name = 'SELECTED_POPIN' value =
wd_popin->id ).
So when i click on the link to action in the table column of the field am getting the following error
Access via NULL reference object not possible.
While debugging i have noticed that this error was coming at the below step of the code.
wd_table_cell_editor ?= wd_this->m_view->get_element( id )
in the m_view->get_element( id ) does not contan any value , its showing as table , as null value cannnot be assigned may be its throwing the above error.
But i didnt understand why the view is not getting UI element id ....
Can one please suggest me where might be the wrong....
Regards
Sireesha.

Hi nithya,
Could you please calrify the doubts for the following q's.
1. As u said in the above post, i have changed the code to the below.
 data: lr_table type ref to cl_wd_table,
lr_table_col type ref to cl_wd_table_column.
lr_table ?= wd_this->m_view->get_element( 'TABLE' ).
lr_table_col = lr_table->get_column( ID = 'TABLE_CONNECTID' ).
wd_popin = lr_table_col->get_popin( ).
(At the above step which is in bold , eventhough there is value in lr_table_col->get_popin , its not assigning a value to the wd_popin, throwing same error NULL etc.,)
context_element->set_attribute( name = 'SELECTED_POPIN' value =
wd_popin->id ).
2. Before changing the code suggested by u, the follwoing was the code from standard example.Its working fine in the application wdr_test_table.I have debugged the code.The value is getting assigned into wd_table_cell_editor.
The same thing i have done but its failing to assign the value. thats y its throwing null reference error. Here i have a confusion how its assigning a value and y not in the z application.am giving the code below which is in standard and my application.Please clarify these.
data wd_table_cell_editor type ref to cl_Wd_view_element.
data wd_table_column type ref to cl_wd_table_column.
data wd_popin type ref to cl_wd_table_popin.
wd_table_cell_editor ?= wd_this->m_view->get_element( id ).
( Note : wd_this->m_view->get_element contains value but not assigning it to the wd_table_cell_editor and same code in the standard behaving correctly like assigning the view value to the cell editor. Y this behavior, please advice me)
wd_table_column ?= wd_table_cell_editor->get__parent( ).
wd_popin = wd_table_column->get_popin( ).
context_element->set_attribute( name = 'SELECTED_POPIN' value = wd_popin->id )
Regards
Sireesha.

Callback function may be NULL only when database handles are read-only

Hi,
I am getting some errors when trying to run my java code that will try to open a few cursors and join them to fetch the data.
ath .:/usr/src/db-4.7.25.NC/java/src:/usr/local/BerkeleyDB.4.7/lib/db.jar bdbtest
MyDbs: Callback function may be NULL only when database handles are read-only
Error on inventory secondary cursor:
java.lang.IllegalArgumentException: Invalid argument: Callback function may be NULL only when database handles are read-only
What does that error mean? How can I resolve it? I am following the sample program and I can't find anything related.
Here is my code.
import com.sleepycat.db.DatabaseException;
import com.sleepycat.db.Database;
import com.sleepycat.db.SecondaryDatabase;
import com.sleepycat.db.DatabaseConfig;
import com.sleepycat.db.DatabaseType;
import java.io.FileNotFoundException;
import com.sleepycat.db.DatabaseEntry;
import com.sleepycat.db.SecondaryCursor;
import com.sleepycat.db.Cursor;
import com.sleepycat.db.DatabaseException;
import com.sleepycat.db.LockMode;
import com.sleepycat.db.OperationStatus;
import com.sleepycat.db.SecondaryCursor;
import com.sleepycat.db.SecondaryConfig;
import com.sleepycat.bind.EntryBinding;
import com.sleepycat.bind.serial.SerialBinding;
import com.sleepycat.bind.tuple.TupleBinding;
import com.sleepycat.db.Cursor;
import com.sleepycat.db.DatabaseEntry;
import com.sleepycat.db.DatabaseException;
import com.sleepycat.db.LockMode;
import com.sleepycat.db.OperationStatus;
import com.sleepycat.db.SecondaryCursor;
public class bdbtest {
public static void main(String args[]) {
SecondaryDatabase myDatabase = null;
     Database primDB = null;
     Cursor cursor = null;
try {
// Open the database. Create it if it does not already exist.
DatabaseConfig dbConfig = new DatabaseConfig();
     dbConfig.setErrorStream(System.err);
dbConfig.setErrorPrefix("MyDbs");
     dbConfig.setType(DatabaseType.BTREE);
dbConfig.setAllowCreate(true);
     SecondaryConfig mySecConfig = new SecondaryConfig();
     mySecConfig.setErrorStream(System.err);
mySecConfig.setErrorPrefix("MyDbs");
     mySecConfig.setType(DatabaseType.BTREE);
mySecConfig.setAllowCreate(true);
     primDB = new Database("/tmp/bdb_ca_db.db",
"bdb_ca_db",
dbConfig);
dbConfig.setAllowCreate(true);
myDatabase = new SecondaryDatabase("/tmp/bdb_ca_sdb.db",
"ca_sdb_res_alias",
primDB,
mySecConfig);
     String res ="in-1";
     SecondaryCursor secCursor = null;
     DatabaseEntry searchKey =
new DatabaseEntry(res.getBytes("UTF-8"));
     DatabaseEntry foundKey = new DatabaseEntry();
DatabaseEntry foundData = new DatabaseEntry();
     secCursor =
myDatabase.openSecondaryCursor(null, config);
// Search for the secondary database entry.
OperationStatus retVal =
secCursor.getSearchKey(searchKey, foundKey,
foundData, LockMode.DEFAULT);
     if (retVal == OperationStatus.SUCCESS){
          System.out.println("succ");
     }else {
          System.out.println("fail");
while (retVal == OperationStatus.SUCCESS) {
String keyString = new String(foundKey.getData(), "UTF-8");
String dataString = new String(foundData.getData(), "UTF-8");
System.out.println("Key | Data : " + keyString + " | " +
dataString + "");
secCursor.getNextDup(searchKey, foundKey,foundData, LockMode.DEFAULT);
     } catch (Exception e) {
System.err.println("Error on inventory secondary cursor:");
System.err.println(e.toString());
e.printStackTrace();
     finally {
// Make sure to close the cursor
          try {
          cursor.close();
          }catch (com.sleepycat.db.DatabaseException e) {
System.out.println("All done.");
}

Hi,
The error is because either the primary database or the secondary database is configured as read only and the callback to create the secondary keys is null. A quick glance of the code, it appears as if you did not set up the secondary database correctly. In the Getting Started Guide for JAVA API chap 10, we have detailed information on what needs to be done as well as a code example. Please refer to http://www.oracle.com/technology/documentation/berkeley-db/db/gsg/JAVA/index.html and look for Chap 10.
regards,
Mike Brey, Oracle Berkeley DB

Null reference converted to a String

I read somewhere that when a null reference is converted to a string, the result is the String "null", hence a null reference can be used freely within any string concatenation expression.
for example:
String str1 = null;
String str2 = null;
System.out.println(str1+=str2);//outputs "nullnull"
Before I read about this, I would have thought that a NullPointerException would have been thrown.
Can anyone explain the rationale behind this?

This is not a property of String, its the property of
the println method in the PrintStream class.No, that's not correct.
Whenever Strings are concatenated, non-Strings are converted to Strings and null Strings are converted to the String "null". This is a property of the Java language itself.
The expression a + b, where either a or b is a String, is converted into the expression:
new StringBuffer().append(a).append(b).toString();
It is the append method of StringBuffer that calls the toString method of non-String objects, calls String.valueOf on primitives, and converts null String references into the String "null". Even though it's an API call that technically produces this behavior, it is actually a feature of the Java language itself as is therefore explained in the JLS. See http://java.sun.com/docs/books/jls/second_edition/html/expressions.doc.html#39990 for details.

Null Reference when zooming on hidden detail data.

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