Java 1.4 RMI vs. 1.5 RMI: number of processes spawned at startup - Unix

After executing 'rmiregistry 8890 &' using Java 1.4:
5833 1 0 Oct 4 ? 462:51 /opt/java1.4/bin/PA_RISC2.0/rmiregistry 8890
After executing 'rmiregitry 8890 &' using Java 1.5:
25394 1 0 Feb08 ? 0:00:00 /opt/java/java1.5/jre1.5.0_12/bin/rmiregistry 8890
25396 25394 0 Feb08 ? 00:00:01 /opt/java/java1.5/jre1.5.0_12/bin/rmiregistry 8890
25397 25396 0 Feb08 ? 00:00:00 /opt/java/java1.5/jre1.5.0_12/bin/rmiregistry 8890
25398 25396 0 Feb08 ? 00:00:00 /opt/java/java1.5/jre1.5.0_12/bin/rmiregistry 8890
25399 25396 0 Feb08 ? 00:00:00 /opt/java/java1.5/jre1.5.0_12/bin/rmiregistry 8890
25400 25396 0 Feb08 ? 00:00:00 /opt/java/java1.5/jre1.5.0_12/bin/rmiregistry 8890
25401 25396 0 Feb08 ? 00:00:03 /opt/java/java1.5/jre1.5.0_12/bin/rmiregistry 8890
25402 25396 0 Feb08 ? 00:00:00 /opt/java/java1.5/jre1.5.0_12/bin/rmiregistry 8890
25403 25396 0 Feb08 ? 00:00:00 /opt/java/java1.5/jre1.5.0_12/bin/rmiregistry 8890
25404 25396 0 Feb08 ? 00:00:00 /opt/java/java1.5/jre1.5.0_12/bin/rmiregistry 8890
25405 25396 0 Feb08 ? 00:00:00 /opt/java/java1.5/jre1.5.0_12/bin/rmiregistry 8890
25406 25396 0 Feb08 ? 00:00:00 /opt/java/java1.5/jre1.5.0_12/bin/rmiregistry 8890
25407 25396 0 Feb08 ? 00:00:00 /opt/java/java1.5/jre1.5.0_12/bin/rmiregistry 8890
25408 25396 0 Feb08 ? 00:00:00 /opt/java/java1.5/jre1.5.0_12/bin/rmiregistry 8890
25409 25396 0 Feb08 ? 00:01:03 /opt/java/java1.5/jre1.5.0_12/bin/rmiregistry 8890
25411 25396 0 Feb08 ? 00:00:00 /opt/java/java1.5/jre1.5.0_12/bin/rmiregistry 8890
25412 25396 0 Feb08 ? 00:00:00 /opt/java/java1.5/jre1.5.0_12/bin/rmiregistry 8890
Is the difference in # of processes spawned due to 1.5's use of socket factories?
Thanks,
gbe

gbe wrote:
The first executable is on a HP-UX 11.11i PA-RISC box:
java -versionjava version "1.4.2.03"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2.03-040401-16:07)
Java HotSpot(TM) Server VM (build 1.4.2 1.4.2.03-040401-18:59-PA_RISC2.0 PA2.0 (aCC_AP), mixed mode)
The second executable is on a Linux RHEL AS R3 i686 box:
java -versionjava version "1.5.0_12"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_12-b04)
Java HotSpot(TM) Server VM (build 1.5.0_12-b04, mixed mode)Well, you have your answer right there. you neglected to mention you were using different operating systems! on older versions of linux, threading was done using magic with cloned processes (or something like that). basically, every system thread on older linux boxes shows up like a "process" when you run something like "ps". on newer versions of linux, threads have been redone to work more like most other operating systems, (and apparently your HP-UX system), where only one process is listed regardless of how many threads it has.
It has nothing to do with the jdk versions you are using and everything to do with the operating systems you are running the tests on.

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     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:201)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
     at org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve.java:246)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
     at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2343)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
     at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:170)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
     at org.apache.catalina.authenticator.SingleSignOn.invoke(SingleSignOn.java:368)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
     at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:1012)
     at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1107)
     at java.lang.Thread.run(Thread.java:484)

RMI is not that hard.. its just hard to explain :)
I have not done the tutorial.. so bare with me..
the errors your seeing can mean many things.. but above all else it means that you've got a problem either connecting or communicating to the rmi_server you created or the rmiRegistry
My suggestion is this...
First try a simpler application.
How about a simple server that returns a string
and sets a string.
then a client app that can read the server string and envoke a change to it...
This will show the basics involved.
let me know your toughts..
j.

Java IDL or RMI-IIOP

Hi,
I am hoping someone can help me on this topic.
I have a corba client and I am going to implement a server in java.
I was told to use RMI-IIOP to implement the server such that clients
(corba or java) can send create/update/delete operation requests to the
server. On the other hand, the server needs to send notifications back
to the corba client side as a result of other unrelated operations. There is already an idl for the notification. In this case, how should I handle
the notification part? Am I supposed to use java idl in this scenario?
Any suggestions are welcome.
Thanks,
Pin

Yes you must use IDL for this as you can't construct a C++ ser ver for RMI/IIOP.

Difference between Java IDL and RMI-IIOP

Hi,
I am new to CORBA / RMI and I am trying to clear my concepts a little bit. Suppose, we want to create a remote object that should be accesible from CORBA clients. Does anyone know what the difference is between creating this object as an RMI object (with RMI-IIOP) and using the java IDL?
In other words, if I am not wrong, it is possible to write the object in java (pretty much like writting an RMI remore object), generate the IDL with rmic and then any CORBA client can access it provided it has the IDL.
Are there any advantages in doing it the other way (explicitely instantiating an ORB in the code, etc) ?
By the way, if we use the first choice (RMI-IIOP), when is the ORB getting called? Is it called by the Tie class, which is generated by rmic -iiop?
Thanks!

Visit this link
http://java.sun.com/j2se/1.3/docs/guide/idl/jidlFAQ.html#java%20idl%20vs%20rmi-iiop

Java Profiler for RMI Applications

I am looking for a profiler to monitor the bottlenecks and the memory usage when running my RMI application.
What would you recommend to use and a comprehensive tool

Couple of thoughts on scaling:
1. Change the mx setting to 1200m -- this is the most you can scale a single instance on 32-bit
2. Use a 64-bit platform you can set memory settings really high (AIX/Solaris)
3. Multiple servers with planning on it using a load balancer
Regards,
John A. Booth
http://www.metavero.com

Exception...   java.io.NotSerializableException (RMI)

hi,
I use a remote object <remoteObjOne> (already registered on the server) to create and register, there, (on the server) a second remote object <remoteObjTwo> .
To do this I call a method of <remoteObjOne> (already registered on the server):
public void buildRemoteDbConnectionOnTheServer(String objName){
     MyClass myClass = new MyClass();
     // MyClass is coded on the server
        try {
            Naming.rebind(objName, myClass); // put in the registry the object.
        } catch (Exception e) {
            System.out.println("buildRemoteDbConnectionOnTheServer erro registering remote obj " + e.getMessage());
}When the statement :
Naming.rebind(objName, myClass);is executed I get this error:
error marshalling arguments; nested exception is:
        java.io.NotSerializableException: MyClass.I would understand what appen and to know how I can manage this error.
Any help shall be appreciated
thank you
regards
tonyMrsangelo

There are several errors here.
1. MyClass is not exported. Does it extend UnicastRemoteObject?
2. You can't bind to a remote registry, only to a registry in the local host. Callbacks have to be registered at the server via a specific remote method that takes the callback interface as a parameter. The server has to store that somewhere and use that to callback the client. In any case the design of using the Registry assumes that there is only one client, which is a broken design in the first place.
3. Callbacks don't work over the Internet without a lot of additional mucking around, usually involving 3rd-party products such as mine. Are you aware of that?

Java WEB AS - Is it possible to prevent a single process using all memory?

Hi all,
We have a SAP PI 7.0 installation and we have encountered issues with Java mappings utilizing all available memory on the Java stack and causing the server to slow and eventually crash. The original issue was caused by a poorly coded map, but as this is a large installation we want to protect ourselves against any other poor coding that may be on the system or introduced later.
Are there any configuration options within the WEB AS whereby we can either limit the amount of memory available to the execution of any one mapping, or that will enable the server to stop processing once a set limit is reached?
Any help will be much appreciated.
Regards,
- Ian

The only thing that comes to my mind is to use several server processes for the Java instance and limit the max heap size. Once that size is reached, the thread will end with OutOfMemory error but since you have several server processes others threads can continue to work.
Markus

Can Java execute batch file outside of current JVM in separate process tree

Hi,
Does anyone know how to run programs from Java as separate processes that will not die when the spawning java program exits (JVM exits).
The problem I have with using Runtime.exec is it spawns only child processes under the current running JVM, thus when the origonal program that called Runtime.exec ends so does all child processes.
Basically I want to start a DOS batch file from my Java application, my Java application will then immediately exit (calling System.exit(0) ). The batch program will continue to run, its does some file clean up, create's some new files and deletes the old jar (containing the main app), it then rebuilds the main app jar and and executes the main class and then exits itself.
I've also tried the apache.tomcat.jni.Proc :-
long pool = Pool.create( new Long(0).longValue() );
long pa = Procattr.create( pool );
Procattr.dirSet( pa, "c:\\temp\\updater\\");
Procattr.cmdtypeSet( pa, Proc.APR_SHELLCM );
Procattr.detachSet( pa, 1 );
long proc = Proc.alloc( pool );
Proc.create( proc, "test.bat", new String[]{"test.bat"}, null, pa, pool );
System.exit(0);
The detach option doesn't work, if I take it off then the bat file runs and stops the JVM exiting, if I leave it in the batch file never gets called.
Is this possible in Java. Can java start master process on Windows XP JDK1.5+?
Cheers
Chris.

Well I found the answer elsewhere (java.net) thought I'd post it here for future visitors who might be experience the same problem.
Basically Runtime can do this however it must be done the following way :-
The java:-
public class Main {
    public static void main(String[] args) throws Exception {
        Process p=Runtime.getRuntime().exec("cmd /c c:\\test.bat");
        System.out.println("done");
        System.out.println("quitting");
        System.exit(0);
}The batch:-
@echo off
PING 1.1.1.1 -n 1 -w 5000 >nul
java -cp "c:\ " MainThe important line that makes the whole thing work is :-
@echo offIf this line is missing then the whole things locks up (must be the io streams getting used)
Also this code can not be run from an IDE (well at least not from Intellj) as it also locks up.
It must be run from a command prompt or jar.
Also note that any commands in the batch file must have there output redirected to "nul" otherwise Windows kills the cmd as soon as it trys to output to a dead stream (dead because the Java has exited). for example :-
@echo off
PING 1.1.1.1 -n 1 -w 10000 >nul
cd %1
del /F /Q *.* >nul
move /Y new\*.* >nul
RD /Q /S new >nul
PING 1.1.1.1 -n 1 -w 1000 >nul
java -cp "c:\ " Main
exit

Java 1.4 RMI vs. 1.5 RMI: number of processes spawned at startup - Unix

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