Java Function To Predict future Co-ordinates of line

Hi all this is my first post so first of all i would like to say hi!
I am wondering if there is a java method which can help me.
Given a straight line consisting of two cartesian points - (x1,y1) and (x2,y2) how do i predic predict a new value if i want to theoretically extend it???
Maybe this will explain better....
Suppose the line is made of these points
x1 = 2
y1 = 8
x2 = 6
y2 = 3
i say that i want to know what x3 would be if the line was extended to say y3 = 0...
x3 = ???
y3 = 0
Is there an easy way to do this in java?? obvioulsy it wont work if x1 and x2 are equal....
This is really bugging me because i am doing my AI dissertation and i just need to sort out this little problem before i run my experiments (the application of this method is for measuring distances of agents in a wrapped environment (torus) )
thanks a lot for any help,
edd

Just because maths i did 7 years ago has slipped my
mind doesn't mean i am not clever enough to be doing
AI!!! :-)If those maths involve finding the equation of a line given two points, yes, yes it does.
;~)

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Java function call from Trigger in Oracle

Moderator edit:
This post was branched from an eleven-year-old long dead thread
Java function call from Trigger in Oracle
@ user 861498,
For the future, if a forum discussion is more than (let's say) a month old, NEVER resurrect it to append your new issue. Always start a new thread. Feel free to include a link to that old discussion if you think it might be relevant.
Also, ALWAYS use code tags as is described in the forum FAQ that is linked at the upper corner of e\very page. Your formulae will be so very much more readable.
{end of edit, what follows is their posting}
I am attempting to do a similar function, however everything is loaded, written, compiled and resolved correct, however, nothing is happening. No errors or anything. Would I have a permission issue or something?
My code is the following, (the last four lines of java code is meant to do activate a particular badge which will later be dynamic)
Trigger:
CREATE OR REPLACE PROCEDURE java_contact_t4 (member_id_in NUMBER)
IS LANGUAGE JAVA
NAME 'ThrowAnError.contactTrigger(java.lang.Integer)';
Java:
CREATE OR REPLACE AND COMPILE JAVA SOURCE NAMED "ThrowAnError" AS
// Required class libraries.
import java.sql.*;
import oracle.jdbc.driver.*;
import com.ekahau.common.sdk.*;
import com.ekahau.engine.sdk.*;
// Define class.
public class ThrowAnError {
// Connect and verify new insert would be a duplicate.
public static void contactTrigger(Integer memberID) throws Exception {
String badgeId;
// Create a Java 5 and Oracle 11g connection.
Connection conn = DriverManager.getConnection("jdbc:default:connection:");
// Create a prepared statement that accepts binding a number.
PreparedStatement ps = conn.prepareStatement("SELECT \"Note\" " +
"FROM Users " +
"WHERE \"User\" = ? ");
// Bind the local variable to the statement placeholder.
ps.setInt(1, memberID);
// Execute query and check if there is a second value.
ResultSet rs = ps.executeQuery();
while (rs.next()) {
badgeId = rs.getString("Note");
// Clean up resources.
rs.close();
ps.close();
conn.close();
// davids badge is 105463705637
EConnection mEngineConnection = new econnection("10.25.10.5",8550);
mEngineConnection.setUserCredentials("choff", "badge00");
mEngineConnection.call("/epe/cfg/tagcommandadd?tagid=105463705637&cmd=mmt%203");
mEngineConnection.call("/epe/msg/tagsendmsg?tagid=105463705637&messagetype=instant&message=Hello%20World%20from%20Axium-Oracle");
Edited by: rukbat on May 31, 2011 1:12 PM

To followup on the posting:
Okay, being a oracle noob, I didn't know I needed to tell anything to get the java error messages out to the console
Having figured that out on my own, I minified my code to just run the one line of code:
// Required class libraries.
import java.sql.*;
import oracle.jdbc.driver.*;
import com.ekahau.common.sdk.*;
import com.ekahau.engine.sdk.*;
// Define class.
public class ThrowAnError {
     public static void testEkahau(Integer memberID) throws Exception {
     try {
          EConnection mEngineConnection = new EConnection("10.25.10.5",8550);
     } catch (Throwable e) {
          System.out.println("got an error");
          e.printStackTrace();
}So, after the following:
SQL> {as sysdba on another command prompt} exec dbms_java.grant_permission('AXIUM',"SYS:java.util.PropertyPermission','javax.security.auth.usersubjectCredsOnly','write');
and the following as the user
SQL> set serveroutput on
SQL> exec dbms_java.set_output(10000);
I run the procedure and receive the following message.
SQL> call java_contact_t4(801);
got an error
java.lang.NoClassDefFoundError
     at ThrowAnError.testEkahau(ThrowAnError:13)
Call completed.
NoClassDefFoundError tells me that it can't find the jar file to run my call to EConnection.
Now, I've notice when I loaded the sdk jar file, it skipped some classes it contained:
c:\Users\me\Documents>loadjava -r -f -v -r "axium/-----@axaxiumtrain" ekahau-engine-sdk.jar
arguments: '-u' 'axium/***@axaxiumtrain' '-r' '-f' '-v' 'ekahau-engine-sdk.jar'
creating : resource META-INF/MANIFEST.MF
loading : resource META-INF/MANIFEST.MF
creating : class com/ekahau/common/sdk/EConnection
loading : class com/ekahau/common/sdk/EConnection
creating : class com/ekahau/common/sdk/EErrorCodes
loading : class com/ekahau/common/sdk/EErrorCodes
skipping : resource META-INF/MANIFEST.MF
resolving: class com/ekahau/common/sdk/EConnection
skipping : class com/ekahau/common/sdk/EErrorCodes
skipping : class com/ekahau/common/sdk/EException
skipping : class com/ekahau/common/sdk/EMsg$EMSGIterator
skipping : class com/ekahau/common/sdk/EMsg
skipping : class com/ekahau/common/sdk/EMsgEncoder
skipping : class com/ekahau/common/sdk/EMsgKeyValueParser
skipping : class com/ekahau/common/sdk/EMsgProperty
resolving: class com/ekahau/engine/sdk/impl/LocationImpl
skipping : class com/ekahau/engine/sdk/status/IStatusListener
skipping : class com/ekahau/engine/sdk/status/StatusChangeEntry
Classes Loaded: 114
Resources Loaded: 1
Sources Loaded: 0
Published Interfaces: 0
Classes generated: 0
Classes skipped: 0
Synonyms Created: 0
Errors: 0
.... with no explanation.
Can anyone tell me why it would skip resolving a class? Especially after I use the -r flag to have loadjava resolve it upon loading.
How do i get it to resolve the entire jar file?
Edited by: themadprogrammer on Aug 5, 2011 7:15 AM
Edited by: themadprogrammer on Aug 5, 2011 7:21 AM
Edited by: themadprogrammer on Aug 5, 2011 7:22 AM
Edited by: themadprogrammer on Aug 5, 2011 7:23 AM
Edited by: themadprogrammer on Aug 5, 2011 7:26 AM

How do I turn on Safari Java functionality?

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It is not possible at the moment. We can only hope that it will be available in the future.

How to use standard java functions in a XSLT mapping

Hi All,
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Please refer to the sample code below:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
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<xsl:output method="text"/>
<xsl:template match="/">
<xsl:variable name="input" select="Title">
<xsl:if test="function-available('javamap:toUpperCase')">
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</xsl:if>
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</xsl:template>
</xsl:stylesheet>
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please reply if you have tried a similar scenario in SAP XI.
Thanks & Regards,
Varun

Hi Varun,
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What i am getting is that you have an element called Author and you want to convert its value into uppercase.
you can write your own user defined function which is static.
Signature of your java method :
public static string toUpperCase(String Author,Map inputparam)
try this xslt map.
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:javamap="java:JavaProgram">
     <xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
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             <xsl:value-of select="//Author_name"/>
     </xsl:param>
     <xsl:param name="inputparam" />
     <xsl:template match="/">
     <Author>
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     </xsl:template>
</xsl:stylesheet>
Hope this will work.
Thanks and Regards
Vishal Kumar

How can I use Seeburger java functions on SAP XI's user defined functions?

Hi All,
As my title implies; how can I use Seeburger java functions on SAP XI's user defined functions? I've tried searching over the net in tutorials regarding this topic but I failed to find one; can someone provide me information regarding my question? thanks very much.
best regards,
Mike

Hi Mike !
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What kind of functions are you trying to use?
Regards,
Matias.

Error while tesing a Datasource created from Java function

Hi ,
I am trying to create a datasource from java function.After build/deploy i am getting the following error . The java class i am using from the EvalGuide Sample. Anybody had similar issues ?
regards
GK
weblogic.xml.query.exceptions.XQueryStaticException: {lib:TestLayer/xfl/library1}protectSSN:1, line 4, column 1: {err}XQ0017: "{lib:TestLayer/xfl/library1}protectSSN": unknown function (or number of arguments (1) is wrong)
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i am using WLS8.1 sp 6 ,ALDSP 2.5

I am testing from Test View.
I tried build-->deploy-->redeploy several times.
Pls find the complete trace below
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     at com.bea.ld.ServerBean.executeFunction(ServerBean.java:95)
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     at weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java:491)
     at weblogic.rmi.cluster.ReplicaAwareServerRef.invoke(ReplicaAwareServerRef.java:120)
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     at weblogic.rmi.internal.BasicExecuteRequest.execute(BasicExecuteRequest.java:35)
     at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:224)
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Problem while calling java function from html

when i tried to call a java function from html i'm getting an error
object don't support this property.
what could be the reason.
This is my html.
I got this from this forum only.
My applet is accessing the system property "user.home".
I ran it in IE
<DIV id="dvObjectHolder">Applet comes here</DIV>
<br><br>
<script>
if(window.navigator.appName.toLowerCase().indexOf("netscape")!=-1){ // set object for Netscape:
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"height=\"0\" width=\"0\" onError=\"changeObject();\"" +
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"<param name=\"mayscript\" value=\"Y\">" +
"<param name=\"archive\" value=\"sTest.jar\">" +
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</script>
<LABEL id="lblOutputText">This text will be replaced by the applet</LABEL>
<BR>
<input value="Javascript to java" type=button onClick="document.appletTest1.fromJavaScript()">

I tried this example using the repy given to an earlier post.
But its not working with me.
What i did in addition was adding plugin.jar to classpath to import netscape.javascript.*;
Let me add some more details
1) I'll add the stack trace
2) my java progrma
3) batch file to sign the applet.
1) This is the stack trace i don't know whether u will undertand this
load: class test.class not found.
java.lang.ClassNotFoundException: test.class
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     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.applet.AppletClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.applet.AppletClassLoader.loadCode(Unknown Source)
     at sun.applet.AppletPanel.createApplet(Unknown Source)
     at sun.plugin.AppletViewer.createApplet(Unknown Source)
     at sun.applet.AppletPanel.runLoader(Unknown Source)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
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     at java.io.FileInputStream.<init>(Unknown Source)
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     at sun.applet.AppletClassLoader.getBytes(Unknown Source)
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Exception in thread "Thread-5" java.lang.NullPointerException
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import java.applet.*;
public class test extends Applet
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3) Batch file
del *.cer
del *.com
del *.jar
del *.class
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jarsigner -keystore harm.com -storepass password -keypass password -signedjar sTest.jar test.jar harm
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Java function with Dynamic config throws null pointer exception

hi Experts,
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The source message has a field called "fname".
The value of "fname" is the input to my java UDF.
The java UDF code is:
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Thanks
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Hi,
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Regards

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Hi,
currently I am using a simple java function to make an RFC call to R3 system.
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please suggest a solution.
I think this is possible using Advance java function, but I am not able to find any example on using Advance java function at help.sap.com.
thaks in advance.

Hi!!!
I'm not sure if I understood you well.
Do you want to preload some data into your structures in the memory and keep them there so you don't need to make a new connection during processing the whole message or every message?
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hello
please tell me can i call a java function through java script function in jsp???

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Hi Friend,
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2. Sample Code like calling a Text ' Hello to the world calling JAVA from ABAP'.
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Timely help would be appreciated.
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1.Middleware is JCO RFC provider it comes with SAP so no need any third party Adapter.
2.
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data:ECHOTEXT type SY-LISEL,
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EXPORTING
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IMPORTING
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Check the sample code and Let me know will you get ECHOTEXT ?
Kanagaraja L
Edited by: Kanagaraja Lokanathan on Jan 6, 2010 1:27 PM

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Hi,
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LD = cc
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RM = rm -f
#------------------------------------- Libs -----------------------------------#
JAVALIBS      = -L$(JAVA_HOME)/jre/bin/classic/
LIBS            = -ljvm -lpthread -lxnet -lnsl -lm -ldl
#-------------------------------- Dependency rules---------------------------#
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LIB_FILES = Interface.a
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# shared libraries object files
LIB_OBJS    = Interface.o
all: $(LIB_FILES)
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# compile C source files into object files.
%.o: %.c
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# clean everything
clean:
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# clean the library's object files only
cleanlibobjs:
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Regards,
Ahmad Jalil Qarshi

I guess, you are better off to ask this question in a C forum. This is a Java forum, you know.

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Hi
I imported the following java function in oracle forms 10g Rel. 2:
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args   JNI.ARGLIST;
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BEGIN
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BEGIN
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    args := JNI.CREATE_ARG_LIST(1);
    JNI.ADD_OBJECT_ARG(args, a0, 'ch/mv/wox/WorkDocumentWsStub$SearchDocuments');
    RETURN JNI.CALL_OBJECT_METHOD(FALSE, obj, 'ch/mv/wox/WorkDocumentWsStub', 'searchDocuments', '(Lch/mv/wox/WorkDocumentWsStub$SearchDocuments;)Lch/mv/wox/WorkDocumentWsStub$SearchDocumentsResponse;', args);
END;I call the function searchDocuments with the following plsql-code in a when-button-pressed trigger:
DECLARE
raisedException      ora_java.jobject;
jo           ora_java.jobject;
jo1          ora_java.jobject;
arr           ora_java.jarray;
BEGIN
message('1');
jo := WorkDocumentWsStub.new;
message('2');
arr := WorkDocumentWsStub.searchDocuments(jo,jo1);
message('3');
EXCEPTION
--check for ORA-105100
WHEN ORA_JAVA.JAVA_ERROR THEN
    :test.msg := 'Unable to call out to Java, ' ||ORA_JAVA.LAST_ERROR;
--check for ORA-105101
WHEN ORA_JAVA.EXCEPTION_THROWN THEN
    raisedException := exception_.new(ORA_JAVA.LAST_EXCEPTION);
    BEGIN
      :test.msg := 'Exception: '||Exception_.toString(raisedException);
    EXCEPTION
      WHEN ORA_JAVA.JAVA_ERROR THEN
        :test.msg := 'Unable to call out to Java, ' ||ORA_JAVA.LAST_ERROR;
    END;
END;The trigger allways raised with the following exception: Exception: java.lang.Exception: java.lang.NullPointerException
Thanks for any help in advance!
Niels

I would suggest putting the calls to WorkDocumentWsStub.new and WorkDocumentWsStub.searchDocuments(jo,jo1) in separate exception blocks so you know which one generates the nullpointerexception.
Also, shouldn't you provide parameters to the "new" function? What should the searchDocuments function search for then? There is no document after all.

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we are developing an R/3-XI-ITK-SBO system. We realized our SOAP component as custom java functions and we installed it on ITK.
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