How can I call a java class from within my program?

I was wondering if there's a platform independent way to call a java class from my program.

Here's my scenario. I'm working on a platform independent, feature rich, object-oriented command prompt program. The way I'm designing it is that users can drop classes they write into my bin directory and gain access to the class through my program. For example, they drop a class named Network.class in the bin directory. They would type Network network at my command prompt and gain access to all the methods available in that class. They can then type system.echo network.ipaddress() at my prompt and get the system's ip address. I have it designed that there's a server running in the background and the clients connect to my port. Once connected the end-user can enter their user name and password and gain access to the system. When they type a command they actually call another java program which connects to my server using a seperate thread. They can then communicate back and forth. I have it set that everything has a process id and it's used to keep track of who called what program. Once the program is done it disconnects and closes. Rather than getting into the nitty gritty (I didn't want to get into heavy detail, I know how everything will work) I'm really interested in finding out how I can call a java program from my program. I don't want it to be part of the app in any way.

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How do you call a java class from the main method in another class?

Hi all,
How do you call a java class from the main() method in another class? Assuming the two class are in the same package.
Thanks
SI
Edited by: okun on May 16, 2010 8:40 PM
Edited by: okun on May 16, 2010 8:41 PM
Edited by: okun on May 16, 2010 8:47 PM

georgemc wrote:
To answer your impending question, either the method you're calling has to be static, or you need an instance of that other class to invoke it against. Prefer the latterAnd to your impending question after that: no, don't use the Singleton pattern.

How can I call a java object from Web dynpro ABAP application?

I made Web dynpro ABAP application and posted it to SAP EP.
For certain business purpose, we need to call external 3rd party java object using 3rd party's java api in Web dynpro application.
Is there anybody who experienced this kind of java interface issue?
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Any comment or suggestion would be greatly appreciated.
Thanks,
Raymond, ABAP Consultant

if you have jco configured, then you can make calls to java api from ABAP .
check out this weblog.
/people/gregor.wolf3/blog/2004/08/26/setup-and-test-sap-java-connector-outbound-connection
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How can I call a LabVIEW executable from within another LabVIEW executable?

I have a customer requirement for two LabVIEW executables. Based on their current setup, they need to run executable "A" or "B", both of which are under independent revision control. I have created a third "selection" executable that allows the operator to choose between one of the two, but I am receiving errors when I attempt to call a LabVIEW executable from within a LabVIEW executable using either the "System exec" VI or the "Run Application" VI. If I call a non-LabVIEW executable (such as Windows Explorer) everything works fine.

> I have a customer requirement for two LabVIEW executables. Based on
> their current setup, they need to run executable "A" or "B", both of
> which are under independent revision control. I have created a third
> "selection" executable that allows the operator to choose between one
> of the two, but I am receiving errors when I attempt to call a LabVIEW
> executable from within a LabVIEW executable using either the "System
> exec" VI or the "Run Application" VI. If I call a non-LabVIEW
> executable (such as Windows Explorer) everything works fine.
As with the other poster, I suspect a path problem. You might try the
path out in a shell window, and if it works, copy the complete absolute
path to LV to see if that works. LV is basically passing the comma
nd to
the OS and doesn't even know what is in it, so you should be able to get
it to work.
The other poster commented on subpanels, which is a good suggestion, but
without going to LV7, an EXE can have open more than one VI. You can
use the VI Server and the Run method to fire up another top-level VI.
The decision is whether you want both to be in unique processes.
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How can we call one java class in another java class?

Hi all,
My problem is ,
one java code creates a file i have to send that file through email as an attachment here i wrote a java code to send a mail with attachment
can any one help me how i can implement this. my idea is to write a send mail function in 1st java code which creates the file
Is this a better idea ???plz suggest me.

Hi all,
My problem is ,
one java code creates a file i have to send that file
through email as an attachment here i wrote a java
code to send a mail with attachment
can any one help me how i can implement this. my idea
is to write a send mail function in 1st java code
which creates the file
Is this a better idea ???plz suggest me.may samaaj nahi atay

How to call a Java class from another java class ??

Hi ..... can somebody plz tell me
How to call a Java Class from another Java Class assuming both in the same Package??
I want to call the entire Java Class (not any specific method only........I want all the functionalities of that class)
Please provide me some slotuions!!
Waiting for some fast replies!!
Regards
Smita Mohanty

Hi Smita,
you just need to create an object of that class,thats it. Then you will be able to execute each and every method.
e.g.
you have developed A.java and B.java, both are in same package.
in implementaion of B.java
class B
            A obj = new A();
             //to access A's methods
             A.method();
            // to access A's variable
            //either
           A.variable= value.
           //or
           A.setvariable() or A.getvariable()

How to: Calling a java class from asp?

Hello all i have a problem to call a Java class from a asp
Here what I do:
[JavaSays.java]
package JavaCom;
public class JavaSays
public String Hello()
return "Hello world" ;
then
javareg /register /class:JavaCom.JavaSays /progid:JavaCom.JavaSays
md c:\winnt\Java\TrustLib\JavaCom
copy JavaSays.class c:\winnt\Java\TrustLib\JavaCom
--Asp
--TestJavaCom.asp
<html>
<body>
<h1>Simple Test</h1>
<% Set ObjPrueba = Server.CreateObject("JavaCom.JavaSays") %>
<%= ObjPrueba.SimpleFn(5) %>
<hr>
</body>
</html>
when i try to run my asp
it tell me that:
Error type : Server Objetc, ASP 0177 (0x80040111)
ClassFactory can not find the class
any idea???
thanks.

I think the OP wants to use a class file as a COM object. I've never done that, but this URL:
http://support.microsoft.com/default.aspx?scid=KB;EN-US;q167941&
seems to indicate that you should have placed the class file into the c:\winnt\Java\TrustLib\ sub directory before you ran the JAvaReg bat file - I would re-run JavaReg and bounce IIS and associated services and see if that works out.
Good Luck
Lee

How can i call forpro prg file from java

Hai friends,
I have a doubt,clear it.
how can i call forpro prg file from java file
by,
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Thanks to your reply,
I have some print statements in my foxpro program file.
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Calling a Java Class from PL/SQL

Hai,
I need a technique of calling a class file and invoke its
methods written in Java by PL/SQL for my intranet development.
PLease let me know if you have really experienced and won.
Thanks
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First, to call a Java class from PL/SQL the class needs to be
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The document contains information on how to load the Java and
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http://otn.oracle.com/docs/products/oracle8i/doc_library/817_doc/
java.817/a83728/03write6.htm
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How can I call a nonstatic class

Hello All,
I've wrote a simple bean for my testcase that count a value (e.g. site access):
public class Bean1 {
private int accessCount = 1;
public int getAccessCount() {
return (accessCount++);
If I call the bean with a jsp-site, it works fine with different scope. e.g. session and application.
With session scope different browser count different. With application scope different bowser count together. Thats the normal attitude.
My jsp code:
<jsp:useBean id="counter" class="ml.view.Bean1" scope="session" />
<jsp:getProperty name="counter" property="accessCount" />
This don't work with a static bean (normal too), but I can only call a static class in my UIX site.
I call the bean from uix with the invoke element. Is that correct? How can I call a nonstatic class with a special scope? Which other solution ist possible?
My uix code:
<invoke method="getAccessCount" result="${uix.eventResult.getAccessCount}" instance="${sessionScope.myBean.getAccessCount}" exception="${uix.eventResult.error}" javaType="ml.view.myBean"/>
Thank you for any solution!
The error messages are:
java.lang.NullPointerException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java)
at oracle.cabo.servlet.event.InvokeEventHandler._invoke(Unknown Source)
at
and so forth...

false in my uix code example: javaType="ml.view.myBean"
correct: javaType="ml.view.Bean1"
Sorry :-) that was only an error in my post not in the really example.

I want to call External Java class from the PL/SQL

Hi,
I am using Oracle Apps R11i (11.5.7), I wanted to call external Java class from the PL/SQL. This external Java class is residing in another application server.
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I know one way. Develop C routine in Oracle Apps to call external java class and call this C routine from the PL/SQL.
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Thanks in advance.
-Venkat

First of all, this is a Java application you're talking about, right (i.e. it has a main() function)? It's not just a class that you're trying to instantiate is it? If it's an application, you obviously have to start a new virtual machine to run it (rather than using the virtual machine built into the database like stored java). I'm a little leary of your mention of an "application server" as this would more commonly mean that a virtual machine is already over there running with access to this class. In which case, you'd typically interface with SOAP or some other RPC API.
All that aside, as long as you have physical disc access (through NFS or whatever) to the class file, you could use a java wrapper class with a system call to do this. In fact, there is a thread in just the last day or so on this very forum that has the code to do just that (see " Invoking OS Commands from PL/SQL"). However, it's worth noting that the virtual machine will be running on the database server in this case and not the application server.

Calling my Java class from JSP page

Hello, I am trying to call my Java class from my JSP page passing parameters to it and getting back a collection of result sets. Can someone tell me what I might be doing wrong:
JSP code to call Java class:
<%
String strEssUser = "test";
String strProcessingMonth = "JUL";
String strProcessingYear = "2002";
strQueryList=new ListReturn(strEssUser.toString(), strProcessingMonth.toString(), strProcessingYear.toString());
%>
I get this error when I try to run this JSP page using tomcat:
C:\Program Files\Apache Tomcat 4.0\work\Standalone\localhost\em\jsp\Test_0005fSummarySBU_0005fscreen$jsp.java:77: Class org.apache.jsp.ListReturn not found.
strQueryList=new ListReturn(strEssUser.toString(), strProcessingMonth.toString(), strProcessingYear.toString());
I'm not sure if this problem is the way I am calling the Java class, or if I have a problem in the Java code itself. Can anyone help?

Ok, I get a very strange error now:
org.apache.jasper.JasperException: Unable to compile class for JSPerror: An error has occurred in the compiler; please file a bug report (http://java.sun.com/cgi-bin/bugreport.cgi).
What is this??? Anyone?

How can I drop the java objects from a schema

hi..good afternoon all...
How can I drop the java objects from a database schema???
suppose the credentials are scott/tiger@db1
Another thing is that...I have to do this from cmd(command prompt) as there is no plsql developer or sqldeveloper installed in the machine.
plss help...thanks in advance...

hi...i have already tried all the options..but it is showing the error..
ora:01435 - user does not exist
but when i have given the command...
select object type, object_name, status from user_objects where object_type like'%JAVA%';
then it is showing that the java_object is present....
Connected to:
Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL>
SQL>
SQL>
SQL> set linesize 200
SQL>
SQL>
SQL>
SQL> select object_type, object_name, status from user_objects where object_type
like '%JAVA%';
OBJECT_TYPE OBJECT_NAME
STATUS
JAVA CLASS javaclass1
VALID
JAVA SOURCE javaclass1
VALID
SQL> drop java source javaclass1.java;
drop java source javaclass1.java
ERROR at line 1:
ORA-01435: user does not exist
SQL>

Calling a java class from asp

Hello all i have a problem to call a Java class from a asp
Here what I do:
[JavaSays.java]
package JavaCom;
public class JavaSays
public String Hello()
return "Hello world" ;
then
javareg /register /class:JavaCom.JavaSays /progid:JavaCom.JavaSays
md c:\winnt\Java\TrustLib\JavaCom
copy JavaSays.class c:\winnt\Java\TrustLib\JavaCom
--Asp
--TestJavaCom.asp
<html>
<body>
<h1>Simple Test</h1>
<% Set ObjPrueba = Server.CreateObject("JavaCom.JavaSays") %>
<%= ObjPrueba.SimpleFn(5) %>
<hr>
</body>
</html>
when i try to run my asp
it tell me that:
Error type : Server Objetc, ASP 0177 (0x80040111)
ClassFactory can not find the class
any idea???
thanks.

any idea???Yes, you are in the wrong forum, this is a Java forum, you have an ASP question, so i suggest you visit an ASP forum/site

How can I call a plsql function from an attribute?

I have an attribute defined in an element. I want execute a PLSQL function from the attribute, and display the returne value with an HTML template.
I've defined the attribute's type like PLSQL, and I've put the called of the function in the value of the attribute, but it doesn't work. The only value I obtain is an URL (I think that is the URL of the function or someting like this).
How can I call to my function from the attribute and display the returnes value in the page?
Thanks.

Thanks, but it doesn't work. I have an attribute called ID_BOL and I want to associate a sequence to that attribute. I've created a function, with the sequence. This function return de value of the sequence. I want taht the attribute takes the value of the sequenece dinamically.
I've tried it, creating the type attribute like PLSQL, and calling the function from the attribute, but it doesn't work.
How can I return the sequence value to my attribute?
Thanks.

How can I call a java class from within my program?

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