EJBs accessing protected classes from java classloader

Hello,
We are facing a problem with classes isolation. I read from this newsgroup that
to access a package level class from the base classloader from a bean, the supporting
classes has to be from the same classloader as the bean. Well I think the only
way we could do that is to have the *Bean.class in the base classloader, which
is not what's recommended or move the support classes into the bean's classloader,
which we cannot do.
The purpose of this mail is to ask: is it a bug from weblogic server? Will it
be fixed one day? If not, does it mean that it is impossible to isolate classes
for local access from public classes?
Thank you, Khiet.

Thank you for your reply.
Hope that one day we will not be obliged to have anything in the main classpath.
:) Khiet.
Rob Woollen <[email protected]> wrote:
Tran T. Khiet wrote:
Hello,
We are facing a problem with classes isolation. I read from this newsgroupthat
to access a package level class from the base classloader from a bean,the supporting
classes has to be from the same classloader as the bean. Well I thinkthe only
way we could do that is to have the *Bean.class in the base classloader,which
is not what's recommended or move the support classes into the bean'sclassloader,
which we cannot do.All correct.
The purpose of this mail is to ask: is it a bug from weblogic server?No, it's how java classloaders work.
Will it
be fixed one day? If not, does it mean that it is impossible to isolateclasses
for local access from public classes?You can expect that future versions of WLS will allow the user more
control over classloaders, but for now you'll need public or protected
access to cross classloaders.
-- Rob
Thank you, Khiet.

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Using ExecutorService class from java.util.concurrent package

Dear java programmers,
I have a question regarding the ExecutorService class from java.util.concurrent package.
I want to parse hundreds of files and for this purpose I'm implementing a thread pool. The way I use the ExecutorService class is summarized below:
ExecutorService executor = Executors.newFixedThreadPool(10);
 for (int i = 0; i < 1000; i++){
 System.out.println("Parsing file No "+i);
 executor.submit(new Dock(i));
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I guess the write way would be to keep the number of active/idle threads in the executor constant (lets say 20 if the thread pool's size is 10) and submit a new one whenever a thread has been finished or terminated. But for this to happen the program should be notified someway whenever a thread is done. Can anybody help me do that?
thanks in advance,
Tom

Ok I found a feasible solution myself although I'm not sure if this is the optimum.
Here's what I did:
 ExecutorService executor = Executors.newFixedThreadPool(10);
 Future<String> future0, future1, future2, future3, future4, future5, future6, future7, future8, future9;
 Future[] futureArray = {future0 = null, future1 = null, future2 = null, future3 = null, future4 = null, future5 = null,
 future6 = null, future7 = null, future8 = null, future9 = null};
 for (int i = 0; i < 10; i++){
 futureArray[i] = executor.submit(new Dock(i));
 }I created the ExecutorService object which encapsulates the thread pool and then created 10 Future objects (java.util.concurrent.Future) and added them into an Array.
For java.util.concurrent.Future and Callable Interface usage refer to:
[http://www.swingwiki.org/best:use_worker_thread_for_long_operations]
[http://www.particle.kth.se/~lindsey/JavaCourse/Book/Part1/Java/Chapter10/concurrencyTools.html]
I used a Future[] Array to make the code neater. So after that I submitted -and in this way filled up- the first 10 threads to the thread pool.
 int i = 9;
 while (i < 1000){
 for (int j = 0; j < 10; j++){
 if (futureArray[j].isDone() && i < 999){
 try{
 i++;
 futureArray[j] = executor.submit(new Dock(i));
 } catch (ExecutionException ex) {
 ex.printStackTrace();
 } catch (InterruptedException ex) {
 ex.printStackTrace();
 try {
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 } catch(InterruptedException iex) { /* ignore */ }
 executor.shutdown();
 try {
 executor.awaitTermination(60, TimeUnit.SECONDS);
 } catch (InterruptedException ex) {
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 executor.shutdownNow();
 }Each of the future[0-9] objects represents a thread in the thread pool. So essentially I'm check which of these 10 threads has been finished (using the java.util.concurrent.Future.isDone() method) and if yes I replenish that empty future[0-9] object with a new one.

How to call EJB deployed on OC4J from java stored procedure?

Hello,
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Can You help me please ?
Many thanks,
Radim Kolek,
Eurotel Prague.

Hi,
You may want to check up this thread
Calling JBoss EJBs from Java stored procedure
Hope this helps,
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OTN Group.

Calling an EJB deployed in OC4J from Java Stored Proc in Oracle

Hello!
Trying to make a call to an EJB deployed in OCJ4 from a oracle java stored proc. After loaded orion.jar and crimson.jar lib into SCOTT schema, I can't get the JNDI Context working because of this error:
============================================
javax.naming.NoInitialContextException: Cannot instantiate class:
com.evermind.server.ApplicationClientInitialContextFactory. Root exception is
java.lang.ClassNotFoundException:
com/evermind/server/ApplicationClientInitialContextFactory
at java.lang.Class.forName0(Class.java)
at java.lang.Class.forName(Class.java)
at com.sun.naming.internal.VersionHelper12.loadClass(VersionHelper12.java:45)
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at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java)
at javax.naming.InitialContext.init(InitialContext.java)
at javax.naming.InitialContext.<init>(InitialContext.java)
===============================
I did load the java with "loadjava" with on time with the "resolve" option and time time no option and still no working.
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=======================================
import java.sql.*;
import java.util.*;
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null

What I did to solve this problem was to
create a simple RMI remote object that
resides outside the database JVM and that
serves as a proxy EJB client for your java
stored procedure. The stored procedure can
invoke a method on the remote RMI object
which then looks up the EJBean's home
interface and invokes the relevant method on
the bean's remote interface, and relays any
return values back to the java stored
procedure.
Hope this helps,
Avi.
null

Access parent class from instance of nested class

Hi,
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protected NestedClass getNestedClass()
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protected class NestedClass extends BaseClass
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There are at least 3 funny things in the code you posted:
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Bye

Unable to access protected function from the child object

Hi all ,
I have an abstract class having one protected method
package foo;
public abstract class A {
protected String getName(){
             return "ABC';
package xyz;
public class B extends A {
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package abc;
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}{code}
My question is why I m not able to call the protected method from child instance but inside the class ???
I have checked this link , it also didn't say about the instance access or access within class .
[http://java.sun.com/docs/books/tutorial/java/javaOO/accesscontrol.html]
Thanks and regards
Anshuman
Edited by: techie_india on Aug 31, 2009 11:25 AM

jossyvjose wrote:
Hi Winston,
Did you mean like this? But still same behaviour.
package abc;
public class Ex extends A {
public static void main(String [] args){
B b = new B();
b.getName(); //still i am not able to calll this function
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package foo;
public abstract class A {
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package xyz;
public class B extends A {
   public void print(){
      System.out.println(super.getName()); // your previous code does nothing...
   public String getName() { // Note the "public" accessor
      return super.getName();
package abc;
public class Ex {
   public static void main(String [] args){
      B b = new B();
      b.getName(); // And NOW it'll work...
{code}Note that this is just example code. I wouldn't suggest it as general practise.
Also, when you write *public* methods, you should generally make them *final* as well (there are exceptions, but it's a good habit to get into; like making instance variables *private* - just do it).
HIH
Winston

Accessing custom classes from JSP

Hi Guys,
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Trying to get some clearer view.. so don't mind..
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home/sonny/web-inf/classes
Maybe it differs from windows enviroment to *nix enviroment.. well, I'm just saying out so if its not the case.. don't mind me.

"access denied" error from Java Web Start

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Java Web Start Console, started Wed Nov 28 16:30:31 PST 2001Java 2 Runtime Environment: Version
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(java.io.FilePermission C:\temp\poc1.xml read)     at
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org.apache.xerces.framework.XMLParser.parse(Unknown Source)     at
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com.hotlocker.client.UploadDownloadClient.uploadFiles(Unknown Source)     at
com.hotlocker.client.UploadDownload.main(Unknown Source)     at
java.lang.reflect.Method.invoke(Native Method)     at
com.sun.javaws.Launcher.executeApplication(Unknown Source)     at
com.sun.javaws.Launcher.executeMainClass(Unknown Source)     at
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com.sun.javaws.Launcher.handleApplicationDesc(Unknown Source)     at
com.sun.javaws.Launcher.handleLaunchFile(Unknown Source)     at
com.sun.javaws.Launcher.run(Unknown Source)     at java.lang.Thread.run(Unknown Source)

Hi,
you can't get a file like in a "normal" app
because a JWS-app runs in the restricted
sandbox environment by default.
So you either sign your app with a digital certificate
or you use a special FileOpenService (JNLP-API).
You could also put the file into the app-jar and
load it by a classloader.
Regards,
Mathias

Accessing utility classes from ebj

I have a session bean trying to access a utility class in the lib directory (same
directory as weblogic.jar). I have packaged it into a jar file and set the classpath
pointing to the file in the startWeblogic.cmd file. I compiled and depolyed the session
bean and it runs fine until it starts to access the class. I got NoClassFoundException.
I have tried to shut down and restart the server without any success. Anyone can
help me this this?
I know I can package the utility into the same jar as my ejb. But I don't want to
do it because it is going to be everywhere. What is the right way of doing it?
Thanks in advance.
L.W.Xu

Rob,
You are right.
Thanks a lot.
L.W.X.
Rob Woollen <[email protected]> wrote:
>
>
If it's in the server classpath, the ejb will have no problem finding it.
Either you have a typo and the class is not in the classpath. You can prove
this by running
javap on the class using the same classpath as your startWebLogic script.
Or, as I suggested in the last response, it's not really standalone. The
jar probably has a
dependence on some classes in the ejb.jar.
-- Rob
"L. W. Xu" wrote:
Rob,
It is a standalone generic jar which has some classes in it. The ejb justcan't find
it.
I have a simple java program which uses it and it runs fine.
Thanks.
L. W. Xu
Rob Woollen <[email protected]> wrote:
If your utility.jar is standalone, then your approach is fine. However,
it sounds like it
is referencing a class that's only
available in your ejb.jar. That won't work.
-- Rob
"L. W. Xu" wrote:
I have a session bean trying to access a utility class in the lib directory(same
directory as weblogic.jar). I have packaged it into a jar file and
set
the classpath
pointing to the file in the startWeblogic.cmd file. I compiled and
depolyed
the session
bean and it runs fine until it starts to access the class. I got NoClassFoundException.
I have tried to shut down and restart the server without any success.Anyone can
help me this this?
I know I can package the utility into the same jar as my ejb. But I
don't
want to
do it because it is going to be everywhere. What is the right way of
doing
it?
Thanks in advance.
L.W.Xu--
AVAILABLE NOW!: Building J2EE Applications & BEA WebLogic Server
by Michael Girdley, Rob Woollen, and Sandra Emerson
http://learnWebLogic.com
<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
<html>
If your utility.jar is standalone, then your approach is fine. However,
it sounds like it is referencing a class that's only
 available in your ejb.jar. That won't work.
-- Rob
"L. W. Xu" wrote:
<blockquote TYPE=CITE>I have a session bean trying to access a utility
class in the lib directory (same
 directory as weblogic.jar). I have packaged it into a jar file and
set the classpath
 pointing to the file in the startWeblogic.cmd file. I compiled and
depolyed the session
 bean and it runs fine until it starts to access the class. I gotNoClassFoundException.
 I have tried to shut down and restart the server without any success.
Anyone can
 help me this this?
I know I can package the utility into the same jar as my ejb. ButI
don't want to
 do it because it is going to be everywhere. What is the right wayof
doing it?
Thanks in advance.
L.W.Xu</blockquote>
<pre>--
AVAILABLE NOW!: Building J2EE Applications & BEA WebLogic Server
by Michael Girdley, Rob Woollen, and Sandra Emerson
http://learnWebLogic.com</pre>
</html>
AVAILABLE NOW!: Building J2EE Applications & BEA WebLogic Server
by Michael Girdley, Rob Woollen, and Sandra Emerson
http://learnWebLogic.com
<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
<html>
If it's in the server classpath, the ejb will have no problem finding it.
Either you have a typo and the class is not in the classpath.
You can prove this by running javap on the class using the same classpath
as your startWebLogic script.
Or, as I suggested in the last response, it's not really standalone.
The jar probably has a dependence on some classes in the ejb.jar.
-- Rob
 
"L. W. Xu" wrote:
<blockquote TYPE=CITE>Rob,
It is a standalone generic jar which has some classes in it. The ejb
just can't find
 it.
I have a simple java program which uses it and it runs fine.
Thanks.
L. W. Xu
Rob Woollen <[email protected]> wrote:
 >
 >
 >If your utility.jar is standalone, then your approach is fine.
However,
 >it sounds like it
 >is referencing a class that's only
 >available in your ejb.jar. That won't work.
 >
 >-- Rob
 >
 >"L. W. Xu" wrote:
 >
 >> I have a session bean trying to access a utility class in the lib
directory
 >(same
 >> directory as weblogic.jar). I have packaged it into a jar file and
set
 >the classpath
 >> pointing to the file in the startWeblogic.cmd file. I compiled and
depolyed
 >the session
 >> bean and it runs fine until it starts to access the class. I got
NoClassFoundException.
 >> I have tried to shut down and restart the server without any success.
 >Anyone can
 >> help me this this?
 >>
 >> I know I can package the utility into the same jar as my ejb. But
I don't
 >want to
 >> do it because it is going to be everywhere. What is the right way
of doing
 >it?
 >>
 >> Thanks in advance.
 >>
 >> L.W.Xu
 >
 >--
 >
 >----------------------------------------------------------------------
 >
 >AVAILABLE NOW!: Building J2EE Applications & BEA WebLogic Server
 >
 >by Michael Girdley, Rob Woollen, and Sandra Emerson
 >
 >http://learnWebLogic.com
 >
 >
 >
 >
 ><!doctype html public "-//w3c//dtd html 4.0 transitional//en">
 ><html>
 >If your utility.jar is standalone, then your approach is fine.
However,
 >it sounds like it is referencing a class that's only
 > available in your ejb.jar. That won't work.
 >-- Rob
 >"L. W. Xu" wrote:
 ><blockquote TYPE=CITE>I have a session bean trying to access a
utility
 >class in the lib directory (same
 > directory as weblogic.jar). I have packaged it into a jar file
and
 >set the classpath
 > pointing to the file in the startWeblogic.cmd file. I compiled
and
 >depolyed the session
 > bean and it runs fine until it starts to access the class.
I got NoClassFoundException.
 > I have tried to shut down and restart the server without any
success.
 >Anyone can
 > help me this this?
 >I know I can package the utility into the same jar as my ejb.
But I
 >don't want to
 > do it because it is going to be everywhere. What is the right
way of
 >doing it?
 >Thanks in advance.
 >L.W.Xu</blockquote>
 >
 ><pre>--
 >
 >----------------------------------------------------------------------
 >
 >AVAILABLE NOW!: Building J2EE Applications & BEA WebLogic Server
 >
 >by Michael Girdley, Rob Woollen, and Sandra Emerson
 >
 >http://learnWebLogic.com"><a
href="http://learnWebLogic.com">http://learnWebLogic.com</a></A></pre>
 > </html>
 >
 ></blockquote>
<pre>--
AVAILABLE NOW!: Building J2EE Applications & BEA WebLogic Server
by Michael Girdley, Rob Woollen, and Sandra Emerson
<A HREF="http://learnWebLogic.com">http://learnWebLogic.com</A></pre>
</html>

Accessing IFS classes from Weblogic

Can I access the classes of IFS from within Weblogic by adding the IFS jars to the Classpath of Weblogic?
Also how does EJBs work with IFS?
Kaustuva Mukherjee

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REM ------------------ IFS CLASSPATH ------------------------
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and include IFS_CLASSPATH in your weblogic path.
restart weblogic and u'll have all ifs classes for your use.
null

Accessing table type from JAVA

Hi Experts,
We are making a custom copy of the std FM COM_BPUS_ORG_CONTPERS_REGISTER .
It is observed that Tables are obsolete and we should not use them in custom function modules.
I can pass a table type in import parameter and export parameter.
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Note:- This Function module is not getting called in standard web shops.
Please let me now how i can access this table type for hava while calling FM so as to input or retrieve valus from it.
Regards
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You said:
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For function modules that are not called as a part of the standard flow, you have to develop your own simple BOM, BO, BEI, BE classes and methods to call the custom RFC - the whole nine yards. See the extension guide and see the Extension Demos 2 and 3 for reference.
See the sample JCO calls from Java to understand how to access the table types.

How to access physical files from java platform

Hello All,
We have one JDE Word Writer program, which export the order master data in the DB2/400 Physical files.
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Can use File class to write code to examine and manipulate file.
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Am trying to access MS SSAS data cube from Java through olap4j driver(through msmdpump.dll). I am able to connect , but when I try to execute a query, i am getting the below error: Please help
me out . (I tested the http://XXXX/OLAP/msmdpump.dll in MS Excel , and it is working fine)
org.olap4j.OlapException: XMLA provider gave exception: <soap:Fault xmlns="http://schemas.xmlsoap.org/soap/envelope/">
<faultcode>
XMLAnalysisError.0xc10a0004
</faultcode>
<faultstring>
The CRASHDWHSRG cube either does not exist or has not been processed.
</faultstring>
<detail>
<Error Description="The CRASHDWHSRG cube either does not exist or has not been processed." ErrorCode="3238658052" HelpFile="" Source="Microsoft SQL Server 2012 Analysis Services">
</Error>
</detail>
</soap:Fault>

See my other answer where you asked this same question on another thread
http://social.msdn.microsoft.com/Forums/sqlserver/en-US/22dfc400-668d-4bd4-b76d-7c6b9ddda47a/msmdpumpdll-not-getting-registered?forum=sqlanalysisservices
http://darren.gosbell.com - please mark correct answers

Class not Found when accessing Proxy class from backing bean in VC.

Hi All,
I'm attempting to access a class of a webservice(generated as a proxy) within my ADF application and invoke the method within a backing bean of the View Controller(bean scope : backing bean). The proxy has generated an ObjectFactory class among other classes. When I access this Object factory class from within the backing bean, the application throws a Class not found error.
I don't know where the error lies since I've declared the View Controller of the ADF application dependent on the Proxy and I've imported the class and accessing it within a backing bean. How would you suggest I approach resolveing this.
JDev : 1.1.1.4
Thank you.
Regards
PP.

Hello Arun,
Thank you for suggesting a Data control, but my requirement isn't to drag and drop the method as a button. It's more of a behind the scnes updating data via a database adapter requirement.
I've resolved the issue. turns out, my deployment archive didn't include the proxy.jpr. Once included it works likea charm.
Thanks
PP.

Accessing DLL files from Java

I have a problem with Java, and the problem is that I'm trying to call a DLL file declared by C++ only but without a support for Java programs, is what I'm aiming for going to be available by using the rundll32.exe file.
Note: I'm trying to use the (skydll.dll) file for controling skystar2 DVB card.
Message was edited by:
JZoro

You cannot directly call a DLL from Java unless the DLL exposes entry points that are compatible with the JNI calling conventions.
For example a Java class calling a native function like below:
class Arguments
   private native void setArgs (String[] javaArgs);
   public static void main (String args[])
      Arguments A = new Arguments();
      newArgs[] = A.setArgs(args);
   static
      System.loadLibrary("MyArgs");
}Needs a DLL entry point with the following signature:
JNIEXPORT void JNICALL
Java_Arguments_setArgs (JNIEnv *jenv, jobject job, jobjectArray oarr) {Notice that the first parameter of the method is of type JNIEnv and the second can be either a reference to a class or Java object instance.
Jacques Gonzalez
J4SOFT

EJBs accessing protected classes from java classloader

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