Re: Orion in production
I have to agree with Robert. (with the same caveat, I think Orion is a great product We even recommended it to some clients who wanted a J2EE solution without the cost of BEA or Netscape) There are some things that right now I don't feel comfortable with in it though. Clustering... Clustering is just downright a pain in Orion :) I would love to see something like IPlanet 6's control panel to control clustering and failover. Deployment... Deployment is not terribly difficult if you know what you are doing, but my last project had us using IPlanet 6 and I had developers who had never deployed J2EE apps able to deploy them easily using their deployment tool. It took minimal training for the front end guys to get them trained to use it, and deploy the application without having to come to me for help. That would be nice and is a step closer with the console now in Orion. Pricing is very nice, but believe it or not we have had clients bow out of Orion based on it being too inexpensive. I know that is terrible, but for some reason some clients seem to equate big bucks with maturity and reliability. You wont find me complaining though, heck where else is there a free for development commercial server? Al - Original Message - From: "Robert Krueger" [EMAIL PROTECTED] To: "Orion-Interest" [EMAIL PROTECTED] Sent: Saturday, October 21, 2000 3:19 PM Subject: RE: Orion in production At 07:46 21.10.00 , you wrote: I think that Orion far outshines products like EA Server, Web Sphere, etc because of the functionality available - and you are right - the docs are just a little more pretty and their tech support is absurdly costly and much less informative than what is found on this list. snip/ ok, sorry to somehow take the part of mr. bad guy here but I get the feeling someone following this discussion IMHO doesn't really get the right impression. it's a little bit too black and white. first of all, let me say that after about a year of intensively using orion in development and half a year in production, I'm a generally very satisfied customer and I do appreciate the completeness, standards conformance, speed, great logical concept of orion. however, I think it's oversimplifying things to say it's just marketing that makes the big names so expensive (it's a significant factor, though) and it's not a very good assessment to say that orion beat all competitors' asses if it weren't for the lack of good documentation. there are some significant things that are a lot of work and therefore very expensive like QA and rigid testing with many, many hardware, software, db, vm combinations that a company the size of evermind simply cannot deliver (have you looked at the number of platforms you can get websphere for?). anyone who says that write once run anywhere really works 100% probably hasn't been involved in too many real-world projects where certain combinations of VMs and software just crash under certain load conditions. that's why e.g. weblogic is tested and certified for a particular platform. of course, part of this certification stuff is to keep the typical IT manager happy but to say it's all bullshit is off-target and not very professional IMO. when orion became officially stable (1.0) it still contained many very serious bugs and I presume it wouldn't have been 1.0 time if it hadn't been for J1. the flexibility and development speed of the orion team takes it's toll in the number of fundamental bugs in those very features. with a few exceptions I doubt many of those would slip through bea or ibm QA. I sometimes think it feels like an open source project but without the source. a very loyal user community and very short release cycles but still lots of rough edges. don't get me wrong. I'm a great fan of orion and I think for many projects it's an unbeatable tool with no serious competitors especially considering the price and I think magnus and karl are extremely good software architects and true J2EE wizards but I think there are some more things one has to consider before making the kind of statements that have been made in this thread. at my company we share the experiences with a very efficent development environment using orion together with jikes and ant but we also had our share of spending considerable amounts of time working around serious bugs or waiting for fixes for showstoppers. to sum things up, IMO orion is a great deal and it completely meets (and exceeds) the requirements many people have for an appserver but it does have its rough edges (and that's not primarily the documentation IMO). I'm quite sure that those will fade away eventually but evermind still has some work to do in the areas QA, support and documentation. let's just hope they don't get bought out and manage to grow quickly yet in a controlled manner so they can continue developing a kick-ass server. just my 2c robert (-) Robert Krüger (-) SIGNAL 7 Gesellschaft für Informationstechnologie mbH (-)
Re: Orion in production
lol. What a concept. But we would have to charge 20 or 30 K... of course :) Hey *I* see it, our clients seem to equate inexpensive with "not ready for prime time" Al - Original Message - From: "Mike Cannon-Brookes" [EMAIL PROTECTED] To: "Orion-Interest" [EMAIL PROTECTED] Sent: Saturday, October 21, 2000 10:09 PM Subject: RE: Orion in production Robert, I agree with some of your points, and I have a 'semi' solution that I've told Magnus about before. The autoupdate tool is brilliant, but too addictive. Sometimes I've updated to get fixes for bugs, only to get another version with a different annoying bug. If it had the option to autoupdate to the latest 'stable' version, or the latest 'rough edged' version, it would be perfect. eg java -jar autoupdate.jar -version=stable / development Oh, and to Al who says he can't see Orion because it's too inexpensive? Just tell the client it's $10k, bill 'em $10k and they'll love you for it - oh, and either pocket the $8.5k or donate it to the Orion guys, I'm sure they wouldn't knock you back ;) Mike -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Robert Krueger Sent: Sunday, October 22, 2000 5:19 AM To: Orion-Interest Subject: RE: Orion in production At 07:46 21.10.00 , you wrote: I think that Orion far outshines products like EA Server, Web Sphere, etc because of the functionality available - and you are right - the docs are just a little more pretty and their tech support is absurdly costly and much less informative than what is found on this list. snip/ ok, sorry to somehow take the part of mr. bad guy here but I get the feeling someone following this discussion IMHO doesn't really get the right impression. it's a little bit too black and white. first of all, let me say that after about a year of intensively using orion in development and half a year in production, I'm a generally very satisfied customer and I do appreciate the completeness, standards conformance, speed, great logical concept of orion. however, I think it's oversimplifying things to say it's just marketing that makes the big names so expensive (it's a significant factor, though) and it's not a very good assessment to say that orion beat all competitors' asses if it weren't for the lack of good documentation. there are some significant things that are a lot of work and therefore very expensive like QA and rigid testing with many, many hardware, software, db, vm combinations that a company the size of evermind simply cannot deliver (have you looked at the number of platforms you can get websphere for?). anyone who says that write once run anywhere really works 100% probably hasn't been involved in too many real-world projects where certain combinations of VMs and software just crash under certain load conditions. that's why e.g. weblogic is tested and certified for a particular platform. of course, part of this certification stuff is to keep the typical IT manager happy but to say it's all bullshit is off-target and not very professional IMO. when orion became officially stable (1.0) it still contained many very serious bugs and I presume it wouldn't have been 1.0 time if it hadn't been for J1. the flexibility and development speed of the orion team takes it's toll in the number of fundamental bugs in those very features. with a few exceptions I doubt many of those would slip through bea or ibm QA. I sometimes think it feels like an open source project but without the source. a very loyal user community and very short release cycles but still lots of rough edges. don't get me wrong. I'm a great fan of orion and I think for many projects it's an unbeatable tool with no serious competitors especially considering the price and I think magnus and karl are extremely good software architects and true J2EE wizards but I think there are some more things one has to consider before making the kind of statements that have been made in this thread. at my company we share the experiences with a very efficent development environment using orion together with jikes and ant but we also had our share of spending considerable amounts of time working around serious bugs or waiting for fixes for showstoppers. to sum things up, IMO orion is a great deal and it completely meets (and exceeds) the requirements many people have for an appserver but it does have its rough edges (and that's not primarily the documentation IMO). I'm quite sure that those will fade away eventually but evermind still has some work to do in the areas QA, support and documentation. let's just hope they don't get bought out and manage to grow quickly yet in a controlled manner so they can continue developing a kick-ass server. just my 2c robert (-) Robert Krüger (-) SIGNAL 7 Gesellschaft für Informationstechnologie mbH (-) Brüder-Knauß-Str. 79 - 64285 Darmstadt, (-) Tel: 06151
Re: ANSWER: How to use pooled connections in Orion?
Orion will bind the Datasource to the JNDI environment for you, you set this
up in the data-sources.xml file. for instance for my Oracle instance the
file is ... defined in data-sources.xml like so
?xml version="1.0"?
!DOCTYPE data-sources PUBLIC "Orion data-sources"
"http://www.orionserver.com/dtds/data-sources.dtd"
data-sources
!--
An example/default DataSource that uses an ordinary
JDBC-driver (in this case hsql) to create the connections.
This tag creates all the needed kinds
of data-sources, transactional, pooled and EJB-aware sources.
The source generally used in application code is the "EJB"
one - it provides transactional safety and connection pooling.
--
data-source
class="com.evermind.sql.DriverManagerDataSource"
name="Oracle"
location="jdbc/RedbookDS"
xa-location="jdbc/xa/RedbookXADS"
ejb-location="jdbc/RedbookDS"
connection-driver="oracle.jdbc.driver.OracleDriver"
username=""
password=""
url="jdbc:oracle:thin:@enterprise:1521:G2K_DEV"
inactivity-timeout="30"
/
/data-sources
this will bind my DataSource to "java:comp/env/jdbc/RedbookDS"
Al
- Original Message -
From: "Mark" [EMAIL PROTECTED]
To: "Orion-Interest" [EMAIL PROTECTED]
Sent: Saturday, October 21, 2000 8:01 PM
Subject: RE: ANSWER: How to use pooled connections in Orion?
Deepak et al:
I'm confused about how Orion populates the JNDI server with the
DataSource object. Obviously for the code fragment you posted to work,
an object "jdbc/SQLServerDS" has to exist in your directory server. How
does it get there?
I would have guessed that admin.jar -installDataSource was the answer,
but I find no switch there which would tell Orion how to find the
directory server.
Many thanks for your posts, they're very helpful!
--Mark
===
Hi,
The way you access the datasource is dependent on where will you access
the
datasource from. I'm currently accessing the datasource from a servlet
which
is pretty straightforward:
InitialContext ctx = new InitialContext();
DataSource ds = (DataSource)ctx.lookup("jdbc/SQLServerDS");
The above method might not be portable but it works for me so I mention
it.
Note that you don't need any special Orion datasource name. DataSource
is
defined in javax.sql.*
The portable way which require more work is to add the following to your
web.xml if you access the datasource from servlets and/or JSP:
context-param
param-namemyDS/param-name
param-valuejdbc/SQLServerDS/param-value
/context-param
resource-ref
descriptionA data source/description
res-ref-namemyDS/res-ref-name
res-typejavax.sql.DataSource/res-type
res-authCONTAINER/res-auth
/resource-ref
Now, you can access the datasource by:
InitialContext ctx = new InitialContext();
DataSource ds = (DataSource)ctx.lookup("java:comp/env/myDS");
--Deepak
-Original Message-
From: Luis M Bernardo [mailto:[EMAIL PROTECTED]]
Sent: Thursday, October 12, 2000 7:39 AM
To: Goel, Deepak
Subject: Re: ANSWER: How to use pooled connections in Orion?
hi. thanks for posting this message, but could you show me how you make
the connection (a code snippet)? Looking at old postings I see some
people
using a DataSource and some others a ConnectionPoolDataSource. Also, you
use a DriverManagerDataSource, some other people use a
ConnectionDataSource.
cheers,
luis
On Sat, 7 Oct 2000, Goel, Deepak wrote:
Hello everyone,
I've seen that many people are confused over how to setup pooled
connections
in Orion (even I was initially). Now since I figured out through
documentation and through some hit and try, I would like to share
these
instructions. Keep in mind that this is only one way of setting it up
and
there are other ways to setup depending on capabilities of the driver.
1. Basically, the first step is to create a non-pooled version of your
data
source. This can be done by adding something like this to your
data-sources.xml:
data-source
class="com.evermind.sql.DriverManagerDataSource"
name="SQLServerNP"
location="jdbc/SQLServerNP"
xa-location="jdbc/xa/SQLServerXANP"
ejb-location="jdbc/SQLServerNP"
connection-driver="com.inet.tds.TdsDriver"
username="user"
password="pwd"
url="jdbc:inetdae:localhost"
inactivity-timeout="30"
schema="database-schemas\ms-sql.xml"
/
The above example is for a SQL Server data source using i-net driver.
Remeber to change the connection-driver, username, password and url.
2. Now, the following step will add the pooled version. Add the
following
lines to data-sources.xml.
data-source
class="com.evermind.sql.OrionPooledDataSource"
name="SQLServer"
location="jdbc/SQLServerDS"
xa-location="jdbc/xa/SQLServerXADS"
ejb-location="jdbc/SQLServerDS"
max-connections="4"
source-location="jdbc/SQLServerNP"
Re: Help with getting Orion to talke to Oracle.
You need to copy the oracle drivers into your orion/lib directory I actually
unzipped the classes111.zip there myself.
Al
- Original Message -
From: "J Davis" [EMAIL PROTECTED]
To: "Orion-Interest" [EMAIL PROTECTED]
Sent: Thursday, October 19, 2000 1:43 PM
Subject: Help with getting Orion to talke to Oracle.
I have been pulling my hair out trying to get oracle and orion to talk to
each other. I am sure it is a simple error, but I can't seem to find it.
Here is my problem:
I have installed orion 1.3.8 on a Windows 2000 server with jdk1.2.2,
j2ee1.2.1, jre1.2.2 and oracle8idrivers12_01.zip.
I copied the tools.jar from the jdk into the c:\orion dir.
I have taken the time to set the following ENV variables based off some
earlier messages:
J2EE_CLASSPATH=c:\orion\lib\oracle8idrivers12_01.zip
J2EE_HOME=c:\j2ee
JAVA_HOME=c:\jdk
PATH=(Original path);c:\jdk
I tried exploding the oracle drivers in the orion/lib dir as well as the
jre/lib/ext dir.
I tried adding the oracle zip file to the library tag in the
application.xml
like so:
library path="../lib/oracle8idrivers12_01.zip;../lib" /
I setup the data-source file like so:
data-source
class="com.evermind.sql.ConnectionDataSource"
name="Oracle VND Driver"
location="jdbc/vndCoreDS"
pooled-location="jdbc/vndPooledDS"
xa-location="jdbc/xa/vndXADS"
ejb-location="jdbc/vndDS"
connection-driver="oracle.jdbc.driver.OracleDriver"
username="login"
password="pass"
schema="./database-schemas/oracle.xml"
url="jdbc:oracle:thin:@machine:1521:sid"
inactivity-timeout="120"
/
I built a simple class that looks like this to run from a remote machine:
import java.sql.*;
import javax.ejb.*;
import javax.sql.DataSource;
import javax.naming.*;
import com.micronpc.db.*;
public class TestConn
{
Context jndiContext;
public TestConn()
{
try
{
jndiContext = new InitialContext();
DataSource ds = (DataSource)jndiContext.lookup("jdbc/vndPooledDS");
Connection conn = ds.getConnection();
Statement s = conn.createStatement();
String sql = "SELECT * from adv_sub_family_type";
ResultSet rs = s.executeQuery(sql);
while(rs != null rs.next())
{
System.out.println("Record:" + rs.getString(1));
}
}
catch(Exception e)
{
System.out.println("Got this exception:" + e.getMessage());
e.printStackTrace();
}
}
public static void main(String[] args)
{
TestConn testConn1 = new TestConn();
}
}
My application-client.xml in the META-INF looks like this(although I am
not
trying to use any of these objects yet.):
?xml version="1.0"?
!DOCTYPE application-client PUBLIC "-//Sun Microsystems, Inc.//DTD J2EE
Application Client 1.2//EN"
"http://java.sun.com/j2ee/dtds/application-client_1_2.dtd"
application-client
ejb-ref
ejb-ref-nameQuoteEntity/ejb-ref-name
ejb-ref-typeEntity/ejb-ref-type
homecom.micronpc.api.configurator.QuoteEntityHome/home
remotecom.micronpc.api.configurator.QuoteEntityRemote/remote
/ejb-ref
ejb-ref
ejb-ref-nameModelQuoteEntity/ejb-ref-name
ejb-ref-typeEntity/ejb-ref-type
homecom.micronpc.api.configurator.ModelQuoteEntityHome/home
remotecom.micronpc.api.configurator.ModelQuoteEntityRemote/remote
/ejb-ref
ejb-ref
ejb-ref-nameProfileEntity/ejb-ref-name
ejb-ref-typeEntity/ejb-ref-type
homecom.micronpc.api.configurator.ProfileEntityHome/home
remotecom.micronpc.api.configurator.ProfileEntityRemote/remote
/ejb-ref
/application-client
my jndi.properties looks like this:
java.naming.factory.initial=com.evermind.server.ApplicationClientInitialCont
extFactory
java.naming.provider.url=ormi://ejbtestbox/micron
java.naming.security.principal=admin
java.naming.security.credentials=123
my principales file looke like this:
?xml version="1.0"?
!DOCTYPE principals PUBLIC "//Evermind - Orion Principals//"
"http://www.orionserver.com/dtds/principals.dtd"
principals
groups
group name="administrators"
descriptionadministrators/description
permission name="administration" /
permission
name="com.evermind.server.AdministrationPermission" /
/group
group name="guests"
descriptionguests/description
/group
group name="users"
descriptionusers/description
permission name="rmi:login" /
permission
name="com.evermind.server.rmi.RMIPermission" /
/group
/groups
users
user username="admin" password="123"
descriptionThe default administrator/description
group-membership group="administrators" /
group-membership group="guests" /
group-membership group="users" /
/user
user username="user" password="456"
descriptionThe default user/description
group-membership group="guests" /
group-membership group="users" /
/user
user username="anonymous" password=""
descriptionThe default guest/anonyomous
user/description
group-membership group="guests" /
/user
/users
/principals
if I try to make a connection with a standalone app on the machine it
works
fine. If I
Re: Orion can't find my jar file for my servlet....!
This is not a servlet error really, this is an xwindows error. try being root and typing xhost + (a temporary fix this will open up your x server to the world..) if that works you can man xhost to see how to open specific IP's to connect to the Xserver. If this is not your box but a company box (highly likely coming from a .gov domain) someone reconfigured the Xserver to lock it down. Sysadmins do that when unknown users start hitting Xservers hehe. Al - Original Message - From: "Keith Kwiatek" [EMAIL PROTECTED] To: "Orion-Interest" [EMAIL PROTECTED] Sent: Thursday, October 19, 2000 2:57 PM Subject: Orion can't find my jar file for my servlet! Hello, I loaded a new servlet of mine into the "classes" directory this new servlet needed a jar file, which I put into the ./orion/lib directory (as well in the ./orion and ./classes) ... all seemed to be fine. The servlet worked great for a long time. BUT I then I started to get the errors below. I am pretty sure I didn't touch a thing configuration wise. All I had been doing was recompiling my servlet code. Now it seems it can' t find the jar file??!!! The other example servlets still run fine. Any ideas? 500 Internal Server Error java.lang.InternalError: Can't connect to X11 window server using ':0.0' as the value of the DISPLAY variable. at sun.awt.X11GraphicsEnvironment.initDisplay(Native Method) at sun.awt.X11GraphicsEnvironment.clinit(X11GraphicsEnvironment.java:61) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java, Compiled Code) at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment .java, Compiled Code) at java.awt.Font.initializeFont(Font.java, Compiled Code) at java.awt.Font.init(Font.java, Compiled Code) at javachart.chart.Gc.clinit(Gc.java:74) at javachart.chart.Plotarea.init(Plotarea.java, Compiled Code) at javachart.chart.BarChart.initChart(BarChart.java, Compiled Code) at javachart.chart.Chart.init(Chart.java, Compiled Code) at javachart.chart.BarChart.init(BarChart.java, Compiled Code) at javachart.servlet.columnApp.localInit(columnApp.java, Compiled Code) at javachart.servlet.Bean.buildChart(Bean.java, Compiled Code) at javachart.servlet.Bean.generate(Bean.java, Compiled Code) at javachart.servlet.Bean.getFileName(Bean.java, Compiled Code) at MagicServlet.doGet(MagicServlet.java, Compiled Code) at javax.servlet.http.HttpServlet.service(HttpServlet.java, Compiled Code) at javax.servlet.http.HttpServlet.service(HttpServlet.java, Compiled Code) at javax.servlet.http.HttpServlet.service(HttpServlet.java, Compiled Code) at com.evermind.server.http.d1.si(JAX, Compiled Code) at com.evermind.server.http.d1.forward(JAX, Compiled Code) at com.evermind.server.http.ed.sp(JAX, Compiled Code) at com.evermind.server.http.ed.so(JAX, Compiled Code) at com.evermind.util.f.run(JAX, Compiled Code ON THE SUBSEQUENT REQUEST TO THE SERVLET I GET: 500 Internal Server Error java.lang.NoClassDefFoundError: javachart/chart/Gc at javachart.chart.PieChart.initChart(PieChart.java, Compiled Code) at javachart.chart.Chart.init(Chart.java, Compiled Code) at javachart.chart.PieChart.init(PieChart.java, Compiled Code) at javachart.servlet.pieApp.localInit(pieApp.java, Compiled Code) at javachart.servlet.Bean.buildChart(Bean.java, Compiled Code) at javachart.servlet.Bean.generate(Bean.java, Compiled Code) at javachart.servlet.Bean.getFileName(Bean.java, Compiled Code) at m.doGet(m.java, Compiled Code) at javax.servlet.http.HttpServlet.service(HttpServlet.java, Compiled Code) at javax.servlet.http.HttpServlet.service(HttpServlet.java, Compiled Code) at javax.servlet.http.HttpServlet.service(HttpServlet.java, Compiled Code) at com.evermind.server.http.d1.si(JAX, Compiled Code) at com.evermind.server.http.d1.forward(JAX, Compiled Code) at com.evermind.server.http.ed.sp(JAX, Compiled Code) at com.evermind.server.http.ed.so(JAX, Compiled Code) at com.evermind.util.f.run(JAX, Compiled Code)
Re: Orion under Solaris
But that is just a matter of changing the configuration to a port above 1024. . Al - Original Message - From: "Chris Woods" [EMAIL PROTECTED] To: "Orion-Interest" [EMAIL PROTECTED] Sent: Tuesday, October 17, 2000 10:11 PM Subject: RE: Orion under Solaris This does not permit it to run on any port 1024 on unix, though, and the default for orion is 80, if I'm not mistaken. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Rick Bos Sent: Tuesday, 17 October, 2000 18:20 To: Orion-Interest Subject: RE: Orion under Solaris We run orion under a user account where it was installed. We unzipped the orion.zip as the user, then run it using java -jar orion.jar. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Kemp Randy-W18971 Sent: Tuesday, October 17, 2000 4:43 PM To: Orion-Interest Subject: Orion under Solaris Can the Orion server processes be run as someone other then root (under Solaris) and how?
Re: getting EJB home from JSP
Title:
hmmm interensting. of course i assume that is just
a typo where you have the semicolon and comma after the proable remote
object.narrow as it would not compile that way.
I remember getting these wrapper classes returned,
but I am sure when I was doing it I was not casting correctly. I assume you are
getting an exception on execution?
Al
- Original Message -
From:
Reddy Krishnan
To: Orion-Interest
Sent: Monday, October 09, 2000 2:14
PM
Subject: RE: getting EJB home from
JSP
Hi,
I am
casting the narrowed object properly my code is
CategoryHome catHome =
(CategoryManagerHome)PortableRemoteObject.narrow(
ctx.lookup("java:comp/env/CategoryManager");,
CategoryManagerHome.class);
but
this throws up a wrong ( maybe intermediate class) .(CategoryManagerHome_StatelessSessionHomeWrapper3).
I am using Resin as
the servlet/ web server now and it works fine ( as resin acts like any other
java client would do).
I would rather use
orion for the full setup if i can get over with this
problem.
Thanks
Krishnan
-Original Message-----From: Al Fogleson
[mailto:[EMAIL PROTECTED]]Sent: Sunday, October 08, 1995
7:57 AMTo: Orion-InterestSubject: Re: getting EJB home
from JSP
The only time I have ever seen this is when I
forgot to cast my PortableRemoteObject.narrow() call it should be
something like...
CategoryManagerHomehome;
home = (CategoryManagerHome)
PortableRemoteObject.narrow(ctx.lookup("myhome"),
CategoryManagerHome.class);
you still have to cast it to a thisHome object
even using a portableRemoteObject.narrow()
Al
- Original Message -
From:
Jitendra
Kothari
To: Orion-Interest
Sent: Saturday, October 07, 2000
10:59 PM
Subject: getting EJB home from
JSP
Hi,
I am deploying ejbs, and jsps using a source-directory
method with development set to "true"( instead of packages classes into
ears or wars). When i try to get a handle from JNDI for EJB home class
within my jsp i am getting following error:
java.lang.ClassCastExceptionat
com.sun.corba.se.internal.javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:296)at
javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:137)
This isbecause Orionis returning some wrapper
class instead of
thehome.(CategoryManagerHome_StatelessSessionHomeWrapper3).
The same code works fine if i call from a standalone java
test client, in which case Orion returns some _proxy3
class which gets casted to the proper class.
Would appreciate any help and insights on this
problem.
Thanks Much,
Krishnan
Re: getting EJB home from JSP
Title:
The only time I have ever seen this is when I
forgot to cast my PortableRemoteObject.narrow() call it should be something
like...
CategoryManagerHomehome;
home = (CategoryManagerHome)
PortableRemoteObject.narrow(ctx.lookup("myhome"),
CategoryManagerHome.class);
you still have to cast it to a thisHome object even
using a portableRemoteObject.narrow()
Al
- Original Message -
From:
Jitendra
Kothari
To: Orion-Interest
Sent: Saturday, October 07, 2000 10:59
PM
Subject: getting EJB home from JSP
Hi,
I am deploying ejbs, and jsps using a source-directory method
with development set to "true"( instead of packages classes into ears or
wars). When i try to get a handle from JNDI for EJB home class within my jsp i
am getting following error:
java.lang.ClassCastExceptionat
com.sun.corba.se.internal.javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:296)at
javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:137)
This isbecause Orionis returning some wrapper
class instead of thehome.(CategoryManagerHome_StatelessSessionHomeWrapper3).
The same code works fine if i call from a standalone java test
client, in which case Orion returns some _proxy3 class which
gets casted to the proper class.
Would appreciate any help and insights on this
problem.
Thanks Much,
Krishnan
Re: How does orionconsole do it?? (remote EJBs)
interesting, I connect to a remote server all the time using my clients. I
just set up a jndi.properties file, but it would be similar to your setup.
About the only thing I see is the /stamp after your remoteserver. I have
never had anything after the ormi://remoteserver, Doing all the lookup in
the jndi context. (I assume stamp is a subcontext you are looking in)
thus if I had a bean (thisHome) that i bound to context stamp/myHomeObject I
would go about it this way (using your env.
env.put(Context.INITIAL_CONTEXT_FACTORY,"com.evermind.server.rmi.RMIInitialC
ontextFactory");
env.put(Context.PROVIDER_URL,"ormi://remoteserver");
env.put(Context.SECURITY_PRINCIPAL,"admin");
env.put(Context.SECURITY_CREDENTIALS,"123");
context = new InitialContext(env);
thisHome home;
home = (thisHome)
PortableRemoteObject.narrow(context.lookup("stamp/myHomeObject"),
thisHome.class);
and so on... maybe I am totally missing what you want to do though. :)
Al
- Original Message -
From: "James Ho" [EMAIL PROTECTED]
To: "Orion-Interest" [EMAIL PROTECTED]
Sent: Sunday, October 08, 2000 3:10 AM
Subject: How does orionconsole do it?? (remote EJBs)
Hi everyone,
I am currently trying to access an remote EJB from a servlet. I had
this, in my code..
env.put(Context.INITIAL_CONTEXT_FACTORY,"com.evermind.server.rmi.RMIInitialC
ontextFactory");
env.put(Context.PROVIDER_URL,"orim://remoteserver/stamp");
env.put(Context.SECURITY_PRINCIPAL,"admin");
env.put(Context.SECURITY_CREDENTIALS,"123");
context = new InitialContext(env);
When I tried to lookup the EJB, it kept on saying 'domain was null'.
WHat happened was that it actually tried to look for 'stamp' in the
local orion server (and of course failed).
What I wanted to do, is basically like orionconsole.jar, let u add a
server in, and then search the EJBs on the server, and mine is
web-based. How does orionconsole do it? How come the orion console
doesn't need the remote EJBs' home/remote interface?? I have been
having a lot of problem with servlets accessing remote EJBs.. :(
Any help much appreciated.
Thanks heaps...
Regards, James.
Re: OrionServer newbie question
I dont know as orion is any worse than anything else for jsp's. We use netscape at work on this job (my current one) and it doesnt do any decent logging when something goes wrong either. In a JSP it either works, or it doesnt. :) Al - Original Message - From: "Bill Girten" [EMAIL PROTECTED] To: "Orion-Interest" [EMAIL PROTECTED] Sent: Wednesday, September 13, 2000 9:02 PM Subject: OrionServer newbie question It appears that the logs don't offer much for reporting exceptions when a jsp is launched. Is there an area that helps pinpoint where things (jars, etc.) go wrong? Thanks in advance. - Bill Girten / TechSurfers, Inc.
Clustering
OK, We are specing out a project at work that is going to require clustering our EJB servers... has anyone gotten orion to cluster EJB's? Maybe a quick short tutorial? I would love to recommend Orion, but without the docs on how to do that... it becomes harder. Al
Re: How are database JOINS achieved with EJBs?
Karl; Most of the EJB containers I have tried out have multiple instances of a JVM running, thats an awful lot of overhead. We are also running applications where there are up to (and sometimes more) than 100 simultaneous accesses on a bean. Even using clustering there is still an awful load on our cpu's at that rate. unless there is some way to access the bean other than through the home/remote interface I cant think of any instance where a EJB is not accessed remotely. Whether that RMI call is made locally or from a turly remote client (application, applet, what have you) its still an RMI call. i will grant that it will be faster on a local call than on a network call, but it is still an RMI call. (I'll even grant that RMI is faster than Corba IIOP, but I wonder, since the last tests I saw were using straight RMI if that is even true now.) I disagree on the changing databases using BMP. Enterprise level databases all are pretty much standardized on SQl, and as long as you dont use some database specific code to do your stuff in (whether that be calling stored procedures or whatever) you should be able to be portable accross databses using JNDI to get a datasource. I do agree there are not that many cases where BMP is truly necessary however. :) Al - Original Message - From: "Karl Avedal" [EMAIL PROTECTED] To: "Al Fogleson" [EMAIL PROTECTED] Cc: "Orion-Interest" [EMAIL PROTECTED] Sent: Sunday, May 28, 2000 5:01 AM Subject: Re: How are database JOINS achieved with EJBs? Hello Al, Al Fogleson wrote: Yes and no. There is a terribly large amount of overhead involved in EJB to begin with Which overhead are you referreing to by this? The overhead involved should be low compared to the optimizations that are done to speed up data access. then you start adding all the RMI calls over the network and that adds some load too Well, EJBs will not always be called remotely to start with. A very common scenario is that you write Servlets/JSPs that communicate with EJBs. Usually you will run your Web components and EJBs on the same servr and no RMI calls will be made. Of course though, if you need the remote access it will be used. But that is an overhead you need no matter what technology. Orion's RMI-transport protocol is very optimized. There are some situations, especially when doing the kinds of things you are talking about where BMP is the only way to go. Because of complex joins or the need for a complex primary key. it does put more work on the bean developer but in some cases it may be the only way to go. Yes, in a few very rare cases you need BMP because of the full control, but whenever you do, stop and think about wether you really need it. In most cases when BMP is used it's not really necesseary. And with BMP, as always, you won't get the performance of CMP and it won't be as simple to change database. Regards, Karl Avedal
Re: Does Orion eliminate RMI? Was: How are database JOINS achieved with EJBs?
that would be the only case where I can see that you could bypass RMI. How it would be done and maintain within spec would be beyond me. since the client is not run in the container... certainly in the case of a session bean calling Entities yes, but in the case of a web client (servlet or whatever) calling the session bean you are still going to have the RMI overhead. That was my contention. I assumed Karl was speaking of the inter-container calls between Session and Entity beans when he referred to them not being called remotely after I thought about it :) Al - Original Message - From: "Steven Punte" [EMAIL PROTECTED] To: "Orion-Interest" [EMAIL PROTECTED] Sent: Sunday, May 28, 2000 7:33 PM Subject: Does Orion eliminate RMI? Was: How are database JOINS achieved with EJBs? Al Fogleson wrote: then you start adding all the RMI calls over the network and that adds some load too Well, EJBs will not always be called remotely to start with. A very common scenario is that you write Servlets/JSPs that communicate with EJBs. Usually you will run your Web components and EJBs on the same servr and no RMI calls will be made. Of course though, if you need the remote access it will be used. But that is an overhead you need no matter what technology. Orion's RMI-transport protocol is very optimized. I agree with Karl that RMI, even on the same machine, is a significant overhead. Think of CPU consumption to serialized and de-serialize member function arguments and return value. When ones' client and EJB container are both on the same machine and in the same process, CAN Orion bypass the RMI protocol here and achieve near optimum performance? It would be like having your cake and eating it too, to have both the Enterprise architecture and near optimum performance in this single server scenario. :-) STeve
Re: EJB Question(s)
This is true. I think a lot of us just worry about the cost of RMI too much. Is it noticeable to the user? No, probably not. Right now we sit at about 300 concurrent sessions though and the cost of RMI then becomes pretty high. (actually I think you can actually go higher than 50 concurrent users. there will be an initial hit as they access the site, but then there will be some down time as they view and decide what to do next) Scalability is good with EJB, and it is HOT technology, one just needs to be aware of the costs involved in that. On the clustering side that is exactly why we are using EJB. You start to become overloaded in resources you just through another server onto the network. So yes, what you say about that is absolutely true. Actually a lot of my concerns about RMI costs and such are coming from a recent interview I had which made me think of some things. Some I have rethought and have come to the conclusion they were not exactly correct. But then EJB is so new to both me (I've only been using the technology a few months and just moved to the 1.1 spec) and the place I interviewed at that I had to do some tests to see if the theorys were true or false. :) The cost in network traffic using RMI is not going to go away, the question becomes is that cost higher than we can affford or is the scalability important enough to warrant that higher cost. Personally I don't think that the cost is any worse than using JSP's or servlets. But I have not actually done any timing or performance tests. The advantage in my mind at least is the database pooling Which is also why I am such a fan of Stateless session beans. Pooling is much easier and less costly with them than with stateful. Anyway I babble. Yes, everything you say is correct. Some of us just try to get every ounce of power possible from what we have. :) Sometimes that tends to make us worry worts. Jens probably has some figures on the costs and such, he has done much testing lately with these things. Al - Original Message - From: Kevin Duffey [EMAIL PROTECTED] To: Orion-Interest [EMAIL PROTECTED] Sent: Sunday, April 02, 2000 6:43 PM Subject: RE: EJB Question(s) Ok..you've got me concerned here. I thought EJB was all the rage right now, which is the big reason everyone is going to it. But, you and some others have been saying lately that its slow compared to other solutions. The question is, is it slow only because of network traffic? I mean, we have a T1 line, which is 1.5Mbps, but our network is 100Mbps, so if everyone is using 56K modems hitting our site, thus, about 50 people can use our site via T1 at the exact same moment, how is it being such a bottleneck to the 100Mbps network behind the scenes? Plus, from what I read, the reason to go to EJB is so you can scale the hardware and the app server on each machine works together to keep the same session from the client-side going to the right machine on the EJB tier, and thus as you scale and add more machines, you can handle more. Is this not the case now? Another question arises here. Doesn't the EJB server handle scalability automatically? Meaning, if I add another machine, is it alot of work to get a new app server installed and working with an existing one, so that the requests are divided between the two app servers now? Thanks.
