Functions in Java ?

Hello!
Where can I please read about the basics about creating/using functions(methods?) in Java?
I have looked in the Java tutorial here on this site, but haven't found what I am looking for.
Thanks in advance.
Klas

Firstly, Java doesn't use 'Functions', it uses 'Methods'. And to be honest, just look at the Java Tutorial at java.sun.com and there will be loads of very basic methods, creating them and using them.

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User defined function in java for message mapping

I wrote the following user defined function in java for message mapping and mapped vendor with this. The aim of this function is to write a error file at defined path when i send empty Vendor value from File to RFC-Function module BAPI_PO_CREATE. The "err.txt" error file is not written when i execute in TEST but the value "ERROR" is returned to destination Vendor Field.
public String validation(String a, Container container) {
//write your code here
if (a.equals("")) {
try {
String source = "Vendor cannot be empty";
char buffer[] = new char[source.length()];
source.getChars(0, source.length(), buffer, 0);
for (int i = 0; i < buffer.length; i +=2)
f0.write(buffer<i>);
f0.close();
FileWriter f1 = new FileWriter("/10.10.0.55/sapmnt/trans/edixiin/err.txt");
f1.write(buffer);
f1.close();
catch (IOException e) {}
return "ERROR";

Hi Senthil,
Check these things :
1) Whether you have permission to create a file in that directory.
2) try giving this
10.10.0.55
sapmnt
trans
edixiin
err.txt
3) Also check for permissions.
Hope this will help you.
Regards
Suraj

Writing message mapping function in Java in integration repository

Hi XI Pundits,
I am new to XI. I was working on Message mapping in intergration repository.
To map the source messages to target messages, we do graphical kind of mapping like drag and drop.
There are some functions aavilable at the bottom like concatehate, trim and etc. which we use if we need to modify the source message and map to target.
But in case we face a situation when we don't find the function which suits our requirement, I guess we need to write a new function. We can write these new function using Java only.
Can someone throw some light on this ?
<b>What do we do to invoke java editor in integartion reposity to write mapping function in java ?
Can someone give an example of snippet of code ?</b>
Thanks.

Hi Tushar,
Go thro this help link. You will get all info about User defined function.
http://help.sap.com/saphelp_nw04/helpdata/en/22/e127f28b572243b4324879c6bf05a0/frameset.htm
To get more understanding on mapping go thro this link(PDF File)
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/9202d890-0201-0010-1588-adb5e89a6638
Hope this helps.
regards,
P.Venkat
Message was edited by: Venkataramanan

Can we call java function in java script????

hello
please tell me can i call a java function through java script function in jsp???

of course not. JavaScript is interpreted by the client (web browser) while the Java code in a JSP resides on the server. don't confuse the web application's architecture.
robert

FM call from Variant Function in JAVA SCE

Hello,
I have an issue with Variant Configuration in CRM WEB UI / WebShops.
We have created a variant function in ECC to read/pull a customer master value (KNVV table). This is working fine in ECC & got the desired result.
Now we need replicate the same in CRM. For this we need to create KB, Version & write a variant function in Java class in SCE. In that variant function we need to call a function module and get the customer master / Business partner value as similar to ECC process described above.
But we see that the SAP standard is not supporting FM calls from VF in Java. i.e. we are unable to call the JCO call to a CRM function module from SCE. The package for User defined classes "com.sap.sce.user" and the method inside it public boolean execute(fn_args args, Object obj) { ..... } has no option to make a FM call.
Has anyone faced the similar requirement and has any resolution for this?
Thanks,
Surya.

Hi Eric,
You sound quite familiar with the variant functions. I am also working on IPC-SCE
variant functions for few years now.
We have a situation where I am building some debug logs in one java variant function and want to display it to the web UI at some condition.
Is there any object(like context etc.) that IPC server-side and Webapps share?
I can write that log to a text file and read it from web ui ... but I wanna avoid that.
Is there any other way you know of???
Regards,
Ruchika

How to access C/C++ functions in Java using existing .dll library

Hi JNI Guru's,
I am having well written API in C/C++.This C/C++ files are made into *.dll files.The api are working fine.
I wan't access the C/C++ api functions in Java., just using System.LoadLibrary("*.dll").Is it possible.I kindly request you to suggest some examples and how to do this.
Its Urgent !.
Thanks and Regards,
V K LAL

In general you cannot simply access dlls that have already been written. The DLLs called using JNI must conform to JNI calling standards.
This means you will probably have to write one or more "wrapper" dlls which a) provide the correct JNI interface, and b) call the existing dlls.
There are some programs around that claim to be able to generate such wrappers. Try a google search for "wrapper", "jni", "generate".
The JNI tutorial covers creating wrappers.

Calling c functions in java

How do I call c functions from java?

See http://java.sun.com/docs/books/tutorial/native1.1/index.html

Calling a SP or Function from Java receiving a geometry(MDSYS.SDO_GEOMETRY)

Hi there,
What I want to do is: calling a stored procedure OR function from Java with a String-variable as input and receiving a geometry (SDO_GEOMETRY).
I’m facing currently the problem of calling a stored function on oracle 11g from Java using JPA (EclipseLink), Spring 2.5.6 returning an MDSYS.SDO_GEOMETRY object.
I’ve tried to call a stored procedure with MDSYS.SDO_GEOMETRY as an output parameter instead, but with no success.
The function’s signature looks like this:
CREATE or REPLACE
FUNCTION GET_GEO_BRD_FUNCTION(p_geo_brd_id IN VARCHAR2) RETURN MDSYS.SDO_GEOMETRY AS
sdo_geom    MDSYS.SDO_GEOMETRY := null;
BEGIN
/* do some fancy stuff on the database side */
SELECT sp_geom
    INTO sdo_geom
    FROM geo_brd WHERE id = p_geo_brd_id;
RETURN sdo_geom;
END;
The calling code looks like this:
MyClass extends JpaDaoSupport{
   /** logger */
   protected static final ILogger LOG = LogFactory.getLogger(MyClass.class);
    * {@inheritDoc}
    * @see com.example.MyClass#calculateGeometry(java.lang.String)
   @Override
   public JGeometry calculateGeometry(final String id) {
       JGeometry geometry = null;
       final JpaCallback action = new JpaCallback() {
            @Override
            public Object doInJpa(final EntityManager em) throws PersistenceException {
               final Session session = JpaHelper.getEntityManager(em).getActiveSession();
               final StoredFunctionCall functionCall = new StoredFunctionCall();
               functionCall.setProcedureName("GET_GEO_BRD_FUNCTION");
               functionCall.addNamedArgument("p_geo_brd_id");
               functionCall.setResult("sdo_geom", Oracle.sql.STRUCT.class);
               final ValueReadQuery query = new ValueReadQuery();
               query.setCall(functionCall);
               query.addArgument("p_geo_brd_id");
               final ArrayList args = new ArrayList();
               args.add("2e531e62-2105-4522-978a-ab8baf19e273");// hardcoded for test
               final Object result = session.executeQuery(query, args);
               return result;
    final STRUCT result = (STRUCT) this.getJpaTemplate().execute(action);
    try {
       geometry = JGeometry.load(result);
    } catch (final SQLException e) {
       MyClass.LOG.error("Error loading JGeometry from STRUCT.", e);
       return null;
    return geometry;
And when I execute the query I get the following error:
Internal Exception: java.sql.SQLException: ORA-06550: Row 1, Column 13:
PLS-00382: expression is of wrong type
ORA-06550: Row 1, Column 7:
PL/SQL: Statement ignored
Error Code: 6550
Call: BEGIN ? := GET_GEO_BRD_FUNCTION(p_geo_brd_id=>?); END;
     bind => [=> sdo_geom, 2e531e62-2105-4522-978a-ab8baf19e273]
Query: ValueReadQuery()
So I thought may be let's try it with a stored procedure instead...
The procedure looks like this:
CREATE or REPLACE
PROCEDURE GET_GEO_BRD_PROCEDURE(p_geo_brd_id IN VARCHAR2, sdo_geom OUT MDSYS.SDO_GEOMETRY) AS
BEGIN
/* do some fancy stuff on the database side */
SELECT sp_geom
    INTO sdo_geom
    from geo_brd where id = p_geo_brd_id;
END;
The calling Java code in case of the stored procedure looks like this (only the content of the JPACallback has changed):
@Override
public Object doInJpa(final EntityManager em) throws PersistenceException {
    final Session session = JpaHelper.getEntityManager(em).getActiveSession();
    final StoredProcedureCall spCall = new StoredProcedureCall();
    spCall.setProcedureName("GET_GEO_BRD_PROCEDURE");
    spCall.addNamedArgument("p_geo_brd_id", "p_geo_brd_id", String.class);
    spCall.addNamedOutputArgument("sdo_geom", "sdo_geom", OracleTypes.STRUCT);
    final ValueReadQuery query = new ValueReadQuery();
    query.setCall(spCall);
    query.addArgument("p_geo_brd_id"); // input
    final List args = new ArrayList();
    args.add("2e531e62-2105-4522-978a-ab8baf19e273");// hardcoded for test
    final Object result = session.executeQuery(query, args);
    return result;
And when I execute the query I get the following error:
java.sql.SQLException: ORA-06550: Row 1, Column 13:
PLS-00306: wrong number or types of arguments in call to 'GET_GEO_BRD_PROCEDURE'
ORA-06550: Row 1, Column 7:
PL/SQL: Statement ignored
So both exceptions look quite similar.
I guess in both cases the exception description leads to the assumption, that the wrong type for the return value / output parameter is used…
So - how can a receive a MDSYS_SDO_GEOMETRY object from a stored procedure or stored function in Java ?
What is wrong in the Java code?
Thank you in advance for any suggestions!
Yours,
Chris
Edited by: user3938161 on 20.12.2011 07:46
Edited by: user3938161 on Dec 20, 2011 8:06 AM: added variable declaration of JGeometry geometry in source code

Thanks, that did the trick! ;-)
Here is now the code for stored procedure and function for anybody else encountering the same troubles... (be aware of the parameter order and/or naming!)
Code for stored functions:
final JpaCallback action = new JpaCallback() {
@Override
public Object doInJpa(final EntityManager em) throws PersistenceException {
     final Session session = JpaHelper.getEntityManager(em).getActiveSession();
       * Using CallableStatement for stored functions
      STRUCT st = null;
      CallableStatement cs = null;
      final DatabaseLogin login = session.getLogin();
      final Connection _conn = (Connection) login.connectToDatasource(session.getDatasourceLogin().buildAccessor(), session);
      try {
         try {
            cs = _conn.prepareCall("{? = call GET_GEO_BRD_FUNCTION(?)}");
            cs.registerOutParameter(1, OracleTypes.STRUCT, "MDSYS.SDO_GEOMETRY");
            cs.setString(2, "2e531e62-2105-4522-978a-ab8baf19e273");//TODO: hardcoded for test
            cs.execute();
         } catch (final SQLException e) {
            MyClass.LOG.error("An exception occured calling the stored procedure", e);
         if (cs != null) {
            //reading geometry from the database
            try {
               st = (STRUCT) cs.getObject(1);
            } catch (final SQLException e) {
               MyClass.LOG.error("An exception occured converting the query result to oracle.sql.STRUCT", e);
      } finally {
         try {
            if (_conn != null && !_conn.isClosed()) {
                _conn.close();
         } catch (final SQLException e) {
            MyClass.LOG.error("An exception occured on closing the database connection.", e);
      return st;
final STRUCT result = (STRUCT) this.getJpaTemplate().execute(action);
The code for stored procedure solution:
final JpaCallback action = new JpaCallback() {
@Override
public Object doInJpa(final EntityManager em) throws PersistenceException {
      final Session session = JpaHelper.getEntityManager(em).getActiveSession();
       * Using CallableStatement for stored procedure
      STRUCT st = null;
      CallableStatement cs = null;
      final DatabaseLogin login = session.getLogin();
      final Connection _conn = (Connection) login.connectToDatasource(session.getDatasourceLogin().buildAccessor(), session);
      try {
         try {
            cs = _conn.prepareCall("{call GET_GEO_BRD_PROCEDURE(?,?)}");
            cs.setString("p_geo_brd_id", "2e531e62-2105-4522-978a-ab8baf19e273");
            cs.registerOutParameter("sdo_geom", OracleTypes.STRUCT, "MDSYS.SDO_GEOMETRY");
            cs.execute();
          } catch (final SQLException e) {
            MyClass.LOG.error("An exception occured calling the stored procedure", e);
          if (cs != null) {
            //reading geometry from the database
            try {
               st = (STRUCT) cs.getObject("sdo_geom");
            } catch (final SQLException e) {
               MyClass.LOG.error("An exception occured converting the query result to oracle.sql.STRUCT", e);
       } finally {
          try {
            if (_conn != null && !_conn.isClosed()) {
               _conn.close();
          } catch (final SQLException e) {
            MyClass.LOG.error("An exception occured on closing the database connection.", e);
        return st;
final STRUCT result = (STRUCT) this.getJpaTemplate().execute(action);

Any Mod function in JAVA?

I did not find 'MOD' function in the Math class. Is there any 'MOD' function in Java?
Thanks!

What is your MOD function?
Does the %-operator do what you need or do you want a strict mathematical modulus that returns only positive values?

Why static is used before any function in java

Sir/Madem
I'm new in java. I have just started learning java.
please tell me
"why static is used before any function in java??????"
I have searched on net and in soime bokks .But i was unable toget it. what is exact reson of using static in java.

tandm-malviya wrote:
Sir/Madem
I'm new in java. I have just started learning java.
please tell me
"why static is used before any function in java??????"
I have searched on net and in soime bokks .But i was unable toget it. what is exact reson of using static in java.It's actually seldom used in "real" applications. static associates the method with the class instead of an instance.
Kaj

The troubles with creating SQL function in Java

Hi!
I use Oracle 10g and connect to it from Java application. I need in creating SQL functions from Java code.
In Java I have:
Statement stm = null; try{ stm = dbConnection.createStatement(); stm.executeUpdate( query ); }catch(SQLException ex){ throw ex; }finally{ try{ stm.close(); }catch(Exception ex){ stm.close(); } }
And I'm passing the next SQL function:
create or replace function get_me return number is
result number;
begin
select 5 into result from dual;
return result;
end;
This code is run successful, but I can't call this funtion, because it has status Invalid
I'm looked the next error: PLS-00103: Encountered the symbol "" when expecting one of the following: . @ % ; is authid as cluster order using external character deterministic parallel_enable pipelined aggregate
But I don't understand, What the matter? From Oracle Enterprise Manager I can create this function without problems. So, I wrote the wong Java code. Also, I can't find my error :(
May be, do u have the some ideas?
Thank you very much!

Post the whole pl/sql code please.
To run PL/SQL from within java you'll need callablestatement.
[here |http://www.idevelopment.info/data/Programming/java/jdbc/PLSQL_and_JDBC/CallPLSQLFunc.java] an example : http://www.idevelopment.info/data/Programming/java/jdbc/PLSQL_and_JDBC/CallPLSQLFunc.java

The mkdir() function in java returning false. Why?

I am trying to create the folder archive under the following directory structure:
E:/preweb/CATest/DL/Zipra Internal/EventCompletion/html/archive/
using the boolean mkdir() function in java.
Though the folder archive does not exist under html folder, still the function is returning false.
Canm someone let me know why?

And you have checked that by using
File file =// E:/preweb/CATest/DL/Zipra Internal/EventCompletion/html/archive/
Sys.out.println( file.getParentFile().exists() );

CALLING a STORED SQL FUNCTION from Java 1.1.8

I am trying to execute a stored function in JAVA 1.1.8, from an Oracle
8i Database. My stored function is simple, it converts an Input Number to an output TIME string. I am unsure how to code the call from Java. Are SQL STORED PROCEDURES treated the same as SQL STORED FUNCTIONS? Do you use the CallableProcdure class or something else?
Thanks for your input.

yep - same way. Except no return value.

Calling a PL/SQL function from java

I would like to call a pl/sql function from java. My pl/sql function is taking arrays of records as parameters. How do i proceed? Which specific oracle packages do I have to import?
Please send an example.
TIA,
Darko Guberina

Documentation here: http://download-uk.oracle.com/docs/cd/B14117_01/java.101/b10983/datamap.htm#sthref185
says JPublisher can publish records too.
But when I change the example given at http://download-uk.oracle.com/docs/cd/B14117_01/java.101/b10983/datamap.htm#sthref190 as following:
PACKAGE "COMPANY" AS
type emp_rec is record (empno number, ename varchar2(10));
type emp_list is varray(5) of emp_rec;
type factory is record (
name varchar(10),
emps emp_list
function get_factory(p_name varchar) return factory;
END;
then I see <unknown type or type not found> at sql or java files generated. Any ideas?

Error PLS-00306 during calling PL/SQL function from Java

Hi all,
I am facing a problem during call of oracle PL/SQL function from java using CallableStatement.
I receive following error message.
java.sql.SQLException: ORA-06550: line 1, column 13:
PLS-00306: wrong number or types of arguments in call to 'EXPORT_HIST_ALARMS_FUNC'
ORA-06550: line 1, column 7:
PL/SQL: Statement ignored
As per above error EXPORT_HIST_ALARMS_FUNC in oracle has this signature.
CREATE OR REPLACE FUNCTION EXPORT_HIST_ALARMS_FUNC(startDateTime VARCHAR2, endDateTime VARCHAR2, meType VARCHAR2) RETURN VARCHAR2 IS
END EXPORT_HIST_ALARMS_FUNC;
Above function I have called following way in java.
String sql = "begin ?:= EXPORT_HIST_ALARMS_FUNC(?, ?, ?); end;" ;
CallableStatement cStatement = null;
cStatement = connection.prepareCall(sql);
cStatement.registerOutParameter(1,Types.VARCHAR);
cStatement.setString(2,startDateTime);
cStatement.setString(3,endDateTime);
cStatement.setString(4,meType);
cStatement.execute();
msg = cStatement.getString(1);
Actually above function requires three input parameters and one return parameter.
During execution of above java code it throws SQLException and shows PLS-00306: wrong number or types of arguments in call to 'EXPORT_HIST_ALARMS_FUNC' error.
I have run this function directly from oracle with three parameters and run successfully and finally it returns string.
But I am unable to figure out why it doesn't run from above java code.
Please help regarding this.
Thanks.
Regards,
Shardul Banker

Try this:
String sql = "begin ?:= EXPORT_HIST_ALARMS_FUNC(?, ?, ?); end;" ;
CallableStatement cStatement = null;
cStatement = connection.prepareCall(sql);
cStatement.registerOutParameter(1,Types.VARCHAR);
cStatement.setString(1,startDateTime);
cStatement.setString(2,endDateTime);
cStatement.setString(3,meType);
cStatement.execute();
msg = cStatement.getString(1);Regards,
Martijn Teigeler
Edited by: mTeigeler on Oct 13, 2007 10:22 AM

Calling c++ function in java

Hi,
I would like to know how I can modify c++ program so that I can use its(c++) functions in java.
the program is c++ ready-made and i would like to use its functions in a java package.
i read the turiols concerning this on java.sun.com but does that mean that i have append "jni.h", "JNIEXPORT", etc to the c++ file?
Hints shall be appreciated.
Thanks.

OK, thanks.I have tried the jni procedure but without success.
Is it possible for Java talk to native code (c++) via TCP/IP.
Please advice of any links/knowledge.
Thanks.
1. Strictly speaking, java does not operate on C++; it
operates on C functions. This is more than a quibble:
o JNI expects to call C functions, not methods of C++
objects.
o In fact, if you really just have functions, but they
are compiled as C++, then you will probably have to
declare C linkage.
2. Functions called from java must conform to JNI
calling conventions.
o In general, the starting point is to define how you
would like the object and native method to look in
java, then run jni.h to generate the appropriate C
header definitions, then write the C code.
o Functions called from java must exist in shared
libraries - on Windows, in dlls.
o Existing C function libraries are typically accessed
by writing a "wrapper" dll that implements the
required java interface and then calls the existing
library functions.
o In fact, a wrapper could actually instantiate C++
objects and call their methods.
3. You might care to look up something called JACE,
which some people claim can generate the kinds of
wrappers discussed here.

Functions in Java ?

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