topic Re: Java from ABAP? in Application Development and Automation Discussions

Java from ABAP?

Former Member — Tue, 24 Jun 2008 11:06:36 GMT

Hello!

How can I start (=call) a java program from ABAP? I have only .class and .java files.

Thanks!

Re: Java from ABAP?

Former Member — Tue, 24 Jun 2008 11:08:19 GMT

use this

FUNCTION ZJAVAFROMABAP.

*"----

""Local Interface:

*"----

DATA:

COMMAND TYPE STRING VALUE 'C:\j2sdk1.4.2_12\bin\javac',

COMMAND1 TYPE STRING VALUE 'C:\j2sdk1.4.2_12\bin\java',

DIR TYPE STRING VALUE 'C:\j2sdk1.4.2_12\bin\',

PARAMETER TYPE STRING VALUE 'HelloWorld.java',

PARAMETER1 TYPE STRING VALUE 'HelloWorld'.

CALL METHOD CL_GUI_FRONTEND_SERVICES=>EXECUTE

EXPORTING

APPLICATION = Command

PARAMETER = PARAMETER

DEFAULT_DIRECTORY = DIR

MAXIMIZED = 'X'

MINIMIZED = '' "If you need the DOS window to be minimized

EXCEPTIONS

CNTL_ERROR = 1

ERROR_NO_GUI = 2

BAD_PARAMETER = 3

FILE_NOT_FOUND = 4

PATH_NOT_FOUND = 5

FILE_EXTENSION_UNKNOWN = 6

ERROR_EXECUTE_FAILED = 7

OTHERS = 8.

CALL METHOD CL_GUI_FRONTEND_SERVICES=>EXECUTE

EXPORTING

APPLICATION = Command1

PARAMETER = PARAMETER1

DEFAULT_DIRECTORY = DIR

MAXIMIZED = ''

MINIMIZED = 'X' "If you need the DOS window to be minimized

EXCEPTIONS

CNTL_ERROR = 1

ERROR_NO_GUI = 2

BAD_PARAMETER = 3

FILE_NOT_FOUND = 4

PATH_NOT_FOUND = 5

FILE_EXTENSION_UNKNOWN = 6

ERROR_EXECUTE_FAILED = 7

OTHERS = 8.

write : 'After calling the java function'.

ENDFUNCTION.

Reward point if helpful

Re: Java from ABAP?

Former Member — Tue, 24 Jun 2008 11:09:24 GMT

Refer:

/people/vijayasarathy.raghunathan/blog/2005/12/28/java-editor-inside-abap

http://www.thespot4sap.com/Articles/SAP_Netweaver_Java_Connector.asp

Check out this blog...

/people/gregor.wolf3/blog/2004/08/26/setup-and-test-sap-java-connector-outbound-connection

Re: Java from ABAP?

Former Member — Tue, 24 Jun 2008 11:11:51 GMT

Hi,

Using the SAP Java Connector

SAPu2019s new Java middleware, the SAP Java Connector (JCO) allows customers and partners to easily build SAP-enabled components in Java. JCO supports both inbound (Java calls ABAP) and outbound (ABAP calls Java) calls in desktop and server applications.

Sample program

Import statements: Any program using JCO should contain the following import statement:

import com.sap.mw.jco.*;

Otherwise, you have to fully qualify each class and interface which is very inconvenient.

Connecting to SAP

JCO.Client mConnection;

A connection (or session) with SAP is handled by class JCO.Client

try { 
mConnection = 
JCO.createClient("400", // SAP client 
"c3026902", // userid 
"********", // password 
"EN", // language 
"iwdf5020", // host name 
"00"); // system number 
mConnection.connect(); 
} 
catch (Exception ex) { 
ex.printStackTrace(); 
System.exit(1); 
}

"A Client object is created via a call to createClient(). You can use a specific application server (as in the above code) or a server group (load balancing)." REFER the JCO Javadoc for the overloaded createClient() method for the latter possibility.

"The Client class's connect () method tries to log on to SAP. If that fails for any reason, an exception is thrown. If the call succeeds, we can now stay connected for as long as we like. When we are done, we can call disconnect () to explicitly log off."

Hope this sample would help you..

Regards

Narin Nandivada

Re: Java from ABAP?

Former Member — Wed, 25 Jun 2008 10:04:12 GMT

Thanks!

I see console appeared and very quick disapperared. I can't read anything... What can I write that I can see e.g. HelloWord??

Re: Java from ABAP?

Former Member — Wed, 25 Jun 2008 10:07:53 GMT

put some wait in java code....

I don't know java ....

so can't help u on this....

Reward point if helpful

Re: Java from ABAP?

Former Member — Wed, 25 Jun 2008 10:33:04 GMT

I have right tested. The same ....

Re: Java from ABAP?

Former Member — Wed, 25 Jun 2008 11:58:22 GMT

I have the code:

REPORT javaabap.

DATA:

command TYPE string VALUE 'C:\j2sdk1.4.2_13\bin\java',

parameter TYPE string VALUE 'c:\HelloWorld'.

CALL METHOD cl_gui_frontend_services=>execute

EXPORTING

application = command

parameter = parameter

EXCEPTIONS

cntl_error = 1

error_no_gui = 2

bad_parameter = 3

file_not_found = 4

path_not_found = 5

file_extension_unknown = 6

error_execute_failed = 7

OTHERS = 8.

Where is error?

Re: Java from ABAP?

Former Member — Wed, 25 Jun 2008 12:08:37 GMT

You might have to try with the code from Amitava De.

First you will need to make your java program 'HelloWorld.java'.

Then you might have to put your source 'HelloWorld.java' in directory 'C:\j2sdk1.4.2_12\bin\' before executing the Abap code.

Hope that helps,

Rolf

Re: Java from ABAP?

Former Member — Wed, 25 Jun 2008 12:16:51 GMT

U have not use

DIR TYPE STRING VALUE 'C:\j2sdk1.4.2_12\bin\',

CALL METHOD CL_GUI_FRONTEND_SERVICES=>EXECUTE

EXPORTING

APPLICATION = Command

PARAMETER = PARAMETER

DEFAULT_DIRECTORY = DIR

MAXIMIZED = 'X'

MINIMIZED = '' "If you need the DOS window to be minimized

EXCEPTIONS

CNTL_ERROR = 1

ERROR_NO_GUI = 2

BAD_PARAMETER = 3

FILE_NOT_FOUND = 4

PATH_NOT_FOUND = 5

FILE_EXTENSION_UNKNOWN = 6

ERROR_EXECUTE_FAILED = 7

OTHERS = 8.

or first u run javac for compiling the .java file.....

Edited by: Amitava De on Jun 25, 2008 5:48 PM

Re: Java from ABAP?

Former Member — Wed, 25 Jun 2008 12:25:18 GMT

Ok Thanks! All is ok!! I have deleted ...\dir. But I always see short-time console. I can't see anything. I have written .bat file and executed it.

Thanks! All function!!