How to read XKOMV-EDATU, XKOMV-KBETR fields inside java

Question

How do get the 
XKOMV-EDATU date and pass it to ItemUserExit.java for database read and filtering.
a. The code in ItemUserExit has to filter ZCPI2-ZSPMON for this date XKOMV-EDATU, the delivery date.
This does not work. prItem.getPricingTimestamp returns the current date always, NOT delivery date.
What is the method call that will grab this date.?
b. How do I have to pass this XKOMV-EDATU date to ItemUserExit.java for database read / filtering.
c. The field XKOMV-KBETR has to be read based on the KSCHL = ‘ZCP1’ and / or KSCHL =’PR00’.
These are abap structures. But I am not sure how to read this value inside java.
How would I extract the structure XKOMV-KBETR(the rate) for KBETR(conditionType)=’PR00’ .
Please note that I get an error mandatory condition PR00 is missing. (see attached error message ).
d. “CPIW_A” set up in ItemUserExit.java :: itemUserExitAccess.addItemAttributeBinding("CPIW_A", ZVALUE_CPIW_A );
is NOT available at PricingUserExits.java with the code:
prItem.getItemAttributeBinding("CPIW_A") ,
though they are registered in the method
“determineRelevantAttributesForValueFormula” as per the help html pages.
I had attached the code.
Can you scan thru the code and give feedback.
Can I call you in the morning.
Thanks.
TK
PS:
I get an error “PR00” mandatory condition is missing from the log file.
======
OP="ChangeDocument" ID="34800003" STATUS="200" />objectIds[1]=07F9101FD1D0AD4686B2411E3EFB2DF1&messageTypes[1]=E&messages[1]=Pricing error: Mandatory condition PR00 is missing&areas[1]=SPE&numbers[1]=801&args1[1]=PR00&args2[1]=&args3[1]=&args4[1]=Nov 11, 2005 12:41:37... ...p.sxe.socket.server.rfc.RFCConnection JCO.ServerThread-3 Info: response time of command C
However, I get the response header as:
availableItemConditionTypeNames[1]=PR00&availableItemConditionTypeNames[2]=VA00&availableItemConditionTypeNames[3]=ZA00&availableItemConditionTypeNames[4]=ZOUT&availableItemConditionTypeNames[5]=ZCRT&availableItemConditionTypeNames[6]=K004&availableItemConditionTypeNames[7]=RA01&availableItemConditionTypeNames[8]=RB00&availableItemConditionTypeNames[9]=ZB00&availableH
CODE:
ItemUserExit.java snippet:
          qrypair2[0]  = new sys_query_pair("ZCPI", <b>"200501"</b>, sys_query_pair.GREATER); //
          projection = new String[] { "ZCPI" } ;
          sorting = new String[] { "ZCPI" } ;           res resultSet = database.db_read_first_row("ZCPI2", qrypair2, projection, sorting);
I need to pass the XKOMV-EDATU date field in the above bolded date field.  I think this field is available thru the API for IPricingItemUserExit  inside the overwriteConditionValue method's parameter .
METHOD
overwriteConditionValue:
     public BigDecimal overwriteConditionValue(IPricingItemUserExit      prItem,
                                                         ILastPrice                lastPrice,
                                                         IPricingConditionUserExit prCondition,
                                                         int                       valueFormNo) {
          String sold2party = "", strCPIW_A = "", strCPIW_B = "";
          BigDecimal condValue = prCondition.getConditionValue().getValue();
          BigDecimal netValue  = prItem.getNetValue().getValue();
          String prod = (prItem.getProduct()!=null)? prItem.getProduct().toString(): "NULL";
          SAPTimestamp  priceTstamp = prCondition.getConditionFindingTimestamp(); //prItem.getDefaultConditionAccessTimestamp();  //getPricingTimestamp();
          String strTstamp = priceTstamp.formatYYYYMMDD();
          //KOMP-EDATU ??
          logInfo("valueFormNo: " + valueFormNo +  " Condition Table type:"  + prCondition.getConditionTypeName() +
                     ", condVal:" + condValue + ", netValue:" + netValue + ", KOMP-EDATU:" + strTstamp );
          switch (valueFormNo) {
               case 601:
                         try{
                           sold2party = prItem.getHeaderAttributeBinding("SOLD_TO_PARTY").getValue().getValue();
                           IAttributeBinding iamCPIW_B  = prItem.getItemAttributeBinding("CPIW_B");
                           IAttributeBinding iamCPIW_A  = prItem.getItemAttributeBinding("CPIW_A");
                           if( iamCPIW_A !=null) strCPIW_A = iamCPIW_A.getValue().getValue();
                           if( iamCPIW_B !=null) strCPIW_B = iamCPIW_B.getValue().getValue();
                         }catch(Exception e) {
                              logInfo("EXCEPTION @ GetAttributeBinding exception : " + e.getMessage());
                         logInfo("sold2party: " + sold2party + " strCPIW_A, strCPIW_B: " + strCPIW_A + ", " + strCPIW_B);
                         String CPIW_A = null, CPIW_B = null, BASE_PRICE = null;
                         logInfo("overwriteConditionValue " +
                               "_CPIW_A: " + _CPIW_A + ", _CPIW_B: " + _CPIW_B + ", _BASE_PRICE: " + _BASE_PRICE );
                         double l_cpiw_a, l_cpiw_b, l_base;
                         if( _CPIW_A == null || _CPIW_B == null || _BASE_PRICE == null) {
                              logInfo("overwriteConditionValue *tk* static _CPIW_A.... NULL. returning 999999L" );
                              return BigDecimal.valueOf( 0L );
                         }else{
                              l_cpiw_a = Double.valueOf(_CPIW_A).doubleValue();
                              l_cpiw_b = Double.valueOf(_CPIW_B).doubleValue();
                              l_base   = Double.valueOf(_BASE_PRICE).doubleValue();
                              logInfo("overwriteConditionValue *tk* ???? using STATIC Class Variables" );
                         logInfo("overwriteConditionValue " +
                               "cpiw_a: " + l_cpiw_a + ", l_cpiw_b: " + l_cpiw_b + ", l_base: " + l_base );
                         double fraction = (l_cpiw_a - l_cpiw_b)/l_cpiw_b;
                         logInfo("overwriteConditionValue " +
                                   "*tk* double fraction: " + fraction );                                               
                         double result = l_base * fraction;
                         logInfo("overwriteConditionValue " +
                                   "*tk* double calculated Result: " + result );                       
                         BigDecimal retValue = BigDecimal.valueOf (Math.round(result));
                         condValue = retValue;
                         try{
                              prCondition.setConditionRate(retValue , "USD");     
                         }catch(Exception convEx){
                              logInfo("overwriteConditionValue " +
                                                       "*tk* converstion Rate Exception " + retValue );
                         prItem.setObjectForUserExits("XKOMV_KBETR_C", retValue);
                         logInfo("overwriteConditionValue: 601 conditionRate Return Value: " + retValue );
                         return retValue;
               case 602:
                         /* Forecasted CPI-W value = ( ( D * ( ( A – B ) / B ) )  – ( D + C ) ) */
                    double A = Double.valueOf( PricingUserExits.ZCPI2_ZCPI ).doubleValue();
                    double B = Double.valueOf( PricingUserExits._CPIW_B ).doubleValue();
                    double C=0, D=0;
                    BigDecimal bdC = (BigDecimal)prItem.getObjectForUserExits("XKOMV_KBETR_C");
                    C = bdC.doubleValue();
                    D = C * 0.8;  // just for calculation verification.
                    // C = Double.valueOf( PricingUserExits.XKMOV_KBETR_C ).doubleValue();
                    // D = Double.valueOf( PricingUserExits.XKMOV_KBETR_D ).doubleValue();
                    logInfo("overwriteConditionValue " +
                                                       "*tk* A, B, C, D: " + A + ", " + B + ", " + C + ", " + D);
                    double res1 =  A - B ;
                           res1 =  res1 /B ;
                           res1 =  D * res1;
                    double res2 =  D + C ;
                    double CPI_W ;
                           CPI_W = res1 - res2; //– res2;
                    BigDecimal retn =  new BigDecimal(CPI_W) ;
                   logInfo("overwriteConditionValue *tk* case 602 returning - " + retn );
                    return retn; // new BigDecimal(99999L);
               default:
                    throw new FormulaNotImplementedException(prItem, "value formula", valueFormNo);

Answer 1

Java != javascript.
You can not call java directly from javascript.
The lifecycle:
Request received
Java/JSP runs produces an HTML page
Java stops running
Javascript runs on page when page is loaded.
The only way to call java code again is to submit a request and get the result back in a response. Traditionally the response is a new JSP page to replace the old one.
Using AJAX the response can be just information that you then alter the current page with.
The first example given by skp71 will probably NOT be what you are after. The java code is executed when you load the page, NOT when you push the button which is most probably what you are after.
AJAX is a solution, as is loading a new page.
Cheers,
evnafets