Using and loading newer java classes...

Hi,
I am trying to use a feature from the newest release of java in my application.
Is it possible to find the exact class files within the jre and just put them amongst
my application's classes?
For example if I were to take the new transparency feature
from the latest release and use it on a computer that is not running the latest release of the java runtime?
Any ideas or help would be so great...
Thanx in advance!

BigDaddyLoveHandles wrote:
>
Also, what if i wrote a class that uses the new features, and catch a class not found exception
just on loading that class? so I could inform the user the latest jre needs to be downloaded to use transparency...In my mind, a cleaner approach is the following.
Right off the bat (main?) you can find out the version:
String version = System.getProperty("java.version");And decide what to do based on that. You even could have two versions of your app and chose the one that works with that version of the JRE!Thanx BigDaddyLoveHandles! :)
this is a great idea, i still hope i could find some kind of solution to using classes from a jre that is not installed some how...

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How can I compile and run other java classes from within an application?

Hello there everyone! I really hope that someone can help me. I am writing a program that must be able to compile and run other java classes that are in different files, much like development environments like Kawa or Forte allow you to do.
There has to be a way of doing this ( I hope!! ), but i can't seem to find it!!
I have tried using this command to compile:
Runtime.getRuntime().exec ("c:\\programs\\javac className.java");
...and this one to run:
Runtime.getRuntime().exec ("c:\\programs\\java className");
...but neither works!!! I can compile and run classes that are in the same file as my application, but I can't get it to work at all for files in different directories or files.
PLEASE, PLEASE, PLEASE help me - i've run out of ideas, and i need this to be working in 3 days!!!
Thank you very much for any help anyone can give me, I really appreciate it!! Thanks again!!
Adrian ( ...in distress!! )

public class JavaCompiler{
   public static void main(String[] args)throws Exception{ //sorry bout the laziness
      if(args == null || args.length != 1){
         System.out.println("Usage: java JavaCompiler MyClass.java");
         System.exit(0);
      String className = args[0];
      Runtime rt = Runtime.getRuntime();
      Process p = rt.exec("javac " + className); //consider setting cpath for this
      p.waitFor();
      //now try to run after it is done.
      p = rt.exec("java " + className.substring(0, (className.length() - ".java".length()));
      p.waitFor();
      //do some other stuff
}This should get you going. You may consider looking into the System.getProperty() method in order to determine the type of OS it is running on in order to findo out what command to run. I know that the sun tool listed above is nice, but by my understanding the sun tools provided are not guaranteed to stay the same. I'm no expert on this matter, but that is one of the reasons there is no API documentation for those tools. Also, I don't believe those tools come packaged with the JRE. (Of course if you are making an IDE it will be expected that the user has an sdk installed. Good luck with figuring this thing out.

Problem when loading simple java class in Oracle

Hi,
I am using loadjava to load the java class in the oracle database. But it is failing. Can some one please help me out with this.
Command.
loadjava -thin -user username/password@zrtph0ja:1521:database -resolve firstProcedure.class
Errors:
Error while computing shortname of firstProcedure
ORA-06550: line 1, column 13:
PLS-00201: identifier 'DBMS_JAVA.SHORTNAME' must be declared
ORA-06550: line 1, column 7:
PL/SQL: Statement ignored
Error while computing shortname of firstProcedure
ORA-06550: line 1, column 13:
PLS-00201: identifier 'DBMS_JAVA.SHORTNAME' must be declared
ORA-06550: line 1, column 7:
PL/SQL: Statement ignored
ORA-29521: referenced name java/io/PrintStream could not be found
ORA-29521: referenced name java/lang/Object could not be found
ORA-29521: referenced name java/lang/String could not be found
ORA-29521: referenced name java/lang/StringBuffer could not be found
ORA-29521: referenced name java/lang/System could not be found
loadjava: 7 errors
Please help.
Regards
Sudhir
null

U havent installed JServer in ur DBMS.
Read the Oracle 8i JServer Manual for
manually installing the Oracle JVM.

What is the workflow to compile and load an external class as a runtime library?

I have a set of classes (with some large embeds) that I only want to load one by one at runtime as needed.
I think that I need to compile each of these classes into a separate SWF and use one of the available loaders out there to load and link to them dynamically at runtime (am I on track so far?).
I got a little mixed up in the details though, so I'd just like someone to give me the basic rundown on doing this, get the right termonology, and if you have any reference to the right tutorial on doing it, all the better!
I'm using flex builder, and this is to be used in a flex application.
Thanks!
David

Hi, thanks for the response!
A couple of questions arise:
1) If I use this approach am I correct in my understanding that all classes referenced by my library will be compiled into the final SWF? That will create a lot of duplicated classes since those classes are already being used and loaded in the main SWF. Is there a way to avoid this duplication problem?
2) In trying to play with this approach I ran into a problem. When I create the SWF it fails to find a class Vector ("Type was not found or was not a compile-time constant: Vector"), I think I understand that this is because I am targeting flash player 9, but the code I am using require 10. I can't seem to find an option to change the target in a flex library project as I can in a regular actionscript or MXML project.
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Import new java classes into a running programm

Hello, i have a small Java problem, i hope somebody knows an answer ...
I try to write a Java Programm, this programm starts and load a new class, this class is not defined inside the running programm, but the running programm should use the new class.
example:
// a class file in a directory somewhere at my harddisk
public void class X
void doSomething()
//Print "Hello world"
start programm A
Programm A does something, but doesn�t "know" class X, class X is not compiled with program A
after some seconds, A should load class X.
if (M == N) "import class X"
// At this moment, Programm A knows class X
X NewObjektX = new X();
NewObjektX.doSometing();
Thats my problem :)
I am sorry about my bad english, but its sadly not my first language.

Hello :)
Thx for an answer, i tried your solution, but i get another problem.
The type to create an object ist unknown.
i?ll post my exmaple code :
This class is not compiled with the main programm, only the class file is inside the directory of the main program.
public class SimpleClass
     int Information = 0;
     void printOnScreen()
         System.out.println("Varibale of the class:"
           + this.Information);
This is the main programm:
public class Main {
     public static void main(String[] args)
          try
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            Object instance = newClass.newInstance();
              System.out.println(instance.getClass());
              // At this point no errors, the tpye of instance is
                 "SimpleClass"
              // This line occurs an error, the type "SimpleClass" is
              // unknown.
            SimpleClass newClassInstance = (SimpleClass) instance;
          catch (ClassNotFoundException e)
            System.out.println("Can?t open Class");
            System.err.println(e.getMessage());
          catch (InstantiationException e)
           System.out.println("Error1");
           System.err.println(e.getMessage());
          catch (IllegalAccessException e)
             System.out.println("Error2");
           System.err.println(e.getMessage());
      } // public static void main(String[] args)
} // public class MainI tried another solution with inheritance, i programmed a superclass, and choose the superclass as the type (the Superclass was compiled with the main programm).
The SimpleClass extends Superclass.
// works fine, but i dont want this type of solution :)
Superclass newClassInstance = (Superclass) instance;
How cann i solve the "unknown type" problem ?
SimpleClass newClassInstance = (SimpleClass) instance;

Passing numerical variables to and from a Java class

I'm trying to do something that seems like it should be fairly simple, but apparently it isn't. I'm new to Java and JDBC, so I'm hoping that I'm missing something fundamental and fairly basic.
Basically, I want to pass a set of (number) variables to a Java class from a PL/SQL Procedure, and get back a series of numbers based on calculations to the first set of numbers. (In my real world project, I have to perform a series of matrix calculations to determine regression parameters for two sets of data, but we'll keep this simple.) However, I can find nothing that tells me how to do this, and I'm receiving a series of errors when I attempt it.
For example, let's say I want to send in two decimal numbers, a and b, and receive back the sum s, the difference d, the product p and the quotient q. So, the java class would be:
* MathEx.java
class MathEx {
public static void main(double a, double b, double sum, double diff, double prod, double quo) {
sum = a + b;
diff = a - b;
prod = a * b;
quo = a / b;
Fairly simple, right? It compiles fine using "javac MathEx.java", and then I load the class into the database:
loadjava -u steve/steve MathEx.class
Everything works great. Now, I create a wrapper Procedure. This is where the problem comes in. How do I declare the incoming and outgoing parameters in the Procedure? No matter what I try, I get " the declaration of "MathEx.main([whatever])" is incomplete or malformed"
The procedure I'm trying is:
create or replace procedure Call_MathEx
a NUMBER,
b NUMBER,
s NUMBER,
d NUMBER,
p NUMBER,
q NUMBER
AS
language JAVA
name 'MathEx.main(oracle.sql.NUMBER,oracle.sql.NUMBER,
oracle.sql.NUMBER,oracle.sql.NUMBER,oracle.sql.NUMBER,oracle.sql.NUMBER,)';
I've tried the following values for possible variable types in the "name 'MathEx.main(" statement:
oracle.sql.NUMBER
java.lang.Number
java.lang.Double
java.Math.BigDecimal
The only thing I can get to work is if I just use "java.lang.string[]" and send everything at once, then use parseDouble() to read the parameters inside the Java class. However, that makes it impossible to then read the new values of the sum, difference, product and quotient in the calling procedure, since the variable retain the same value as before the call to the Java class.
Any help is greatly appreciated.

Java Stored Procedures Developers Guide (part of the docs and here on OTN) would probably help.
I suspect you need:
create or replace procedure Call_MathEx
a IN NUMBER,
b IN NUMBER,
s OUT NUMBER,
d OUT NUMBER,
p OUT NUMBER,
q OUT NUMBER
AS
language JAVA
name 'MathEx.main(oracle.sql.NUMBER,oracle.sql.NUMBER,
oracle.sql.NUMBER,oracle.sql.NUMBER,oracle.sql.NUMBER,oracle.sql.NUMBER,)';
Not sure, I always let JDeveloper handle it for me :)

Error loading a java class to oracle db

hi,
my oracle server: 8i Enterprise Edition Release 8.1.7.0.0
i want to load a simple java class into my oracle server.
java source:
public class Ping
     java.lang.String server;
     public static void main(java.lang.String[] args)
          System.out.println(new Ping().runCmd(args[0]));
     public static java.lang.String runCmd(String cmd)
boolean result=false;
int timeout=5000;
try {
java.net.InetAddress byName=java.net.InetAddress.getByName(cmd);
               result=byName.isReachable(timeout);
catch(java.io.IOException e)
e.printStackTrace();
     java.lang.String retVal=java.lang.Boolean.toString(result);
          return retVal;
after compiling the java file. i'm using loadjava at dos prompt.
loadjava -user uname/pwd@db -resolve Ping.class
this command results in
ORA-29545: badly formed class:
loadjava: 1 errors
alternatively i had used a command
loadjava -user uname/pwd@db -noverify -resolve Ping.class
this command results in
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ORA-29532: Java call terminated by uncaught Java exception: java.security.Ac
cessControlException: the Permission (oracle.aurora.security.JServerPermission V
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Domain(SMSPGS|PolicyTableProxy(SMSPGS))
ORA-29545: badly formed class:
loadjava: 2 errors
but user is having sufficient rights (javasyspriv)
what is wrong above, please help me.
regards,
s.mohamed asif

hi,
thanks for your response
Ping.class just checks whether the specified node is reachable or not.
result=byName.isReachable(timeout);
the jdk loaded in oracle DB is older one and the method above java.net.InetAddress.isReachable(java.lang.int) is available since
jdk 1.5
source:
public class Ping
java.lang.String server;
public static void main(java.lang.String[] args)
System.out.println(new Ping().runCmd(args[0]));
public static java.lang.String runCmd(String cmd)
boolean result=false;
int timeout=5000;
try {
java.net.InetAddress byName=java.net.InetAddress.getByName(cmd);
result=byName.isReachable(timeout);
catch(java.io.IOException e)
e.printStackTrace();
java.lang.String retVal=java.lang.Boolean.toString(result);
return retVal;
}how to load the new jdk set into existing oracle db server and replace the existing jdk.
what can be done to achieve this ?
regards,
s.mohamed asif

How to load a java class at server start-up

Hi,
I have one custome java class that is being referenced by all the applications deployed in OC4J container. How can I load that class automatically and be evailable in the path at server start-up time. Is there an option available to give the class name that also gets loaded automatically.
Thanks

To me, you have two mixed issues.
1. OC4J supports a startup/shutdown model where a named class will be invoked when the container is started (or stopped).
This is described in the doc here:
http://download-west.oracle.com/docs/cd/B32110_01/web.1013/b28952/startclas.htm#CIHECEIB
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cheers
-steve-

How to load a java class when application is at first time browsed.

Hi
How can i load a simple java class on application startup.
For servlet it could be done using "load on startup" tag in web.xml
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Thanks

Hi
Code is given below....
package com;
import java.io.IOException;
import javax.servlet.RequestDispatcher;
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          System.out.println("success 1");
          e.printStackTrace();
     finally
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org.apache.catalina.core.StandardContext loadOnStartup
SEVERE: Servlet /DispatcherTest threw load() exception
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     at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3857)
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     at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1162)
     at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:293)
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     at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1304)
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Calling a WL Webservice using wsse from a java class

One of the business partners I am integrating with needs to call my web service
which is secured with UserTokens. The buiness partner is running in a J2EE environment,
but not BEA. They will be calling the web service using a Java Class. Do I need
to create a Java proxy for them to be able to reach my web service? Do I run the
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Thanks
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Hi Linda,
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Regards,
Bruce
[1]
http://edocs.bea.com/wls/docs81/webserv/security.html#1082126
[2]
http://e-docs.bea.com/workshop/docs81/doc/en/workshop/guide/security/ws-security/ovwWebServiceSecurity.html
[3]
http://ftpna2.bea.com/pub/downloads/WS-Policy.pdf
Linda Gilligan wrote:
>
One of the business partners I am integrating with needs to call my web service
which is secured with UserTokens. The buiness partner is running in a J2EE environment,
but not BEA. They will be calling the web service using a Java Class. Do I need
to create a Java proxy for them to be able to reach my web service? Do I run the
java proxy file on my side, or do i give it to them to run? Do i need to provide
them with a client security policy file?
Any help is appricated
Thanks
Linda

How to use junit for a java class in netbeans

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How to store and load in java using mapping

I am doing my project in java, my project consists of producing a card game.
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Using and loading newer java classes...

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