Using JMX with servlets

          HI all,
          i have an app implemented with servlets and JSP using Model 2 architecture.
          i have a requirement to make
          some initialization properties of my servlet configurable without restarting
          the server.
          i was thinking of wrap all the config parameter in a ConfigWrapper object which
          can be exposed as MBean in
          weblogic JMX servlet.
          can anyone give me some feedback? is that possible? what are the tradeoffs?
          - of course, the BIG constraint - which can be tolerated - is that any modification
          is not done under heavy workload.
          the big point is that we want to avoid to restart the server all the time.
          anyone can comment?
          thanx in advance and regards
          marco

ok, I found the answer from this URL http://java.sun.com/developer/technicalArticles/J2SE/jmx.html
It says:
If you wish to run this application on J2SE 1.4, you need to change the line mbs = ManagementFactory.getPlatformMBeanServer();.
to mbs = MBeanServerFactory.createMBeanServer("SimpleAgent");
amongs other things...

Similar Messages

How to use JNI with Servlets

Hi
i was trying to do some example with JNI. I can use JNI with standalone Java application but I just cannot figure out how I can use JNI with Servlet.
Can some one show me a sample code using JNI with Servlets.
thanks very much

hi,
I am also facing the same problem,
when I am using JNI with stand alone application it works fine but when i tried to use it with a servlet It gives unsatisfied linker error
stack: java.lang.UnsatisfiedLinkError: createSocket
     at RelayConnector.createSocket(Native Method)
     at RelayServlet.doGet(RelayServlet.java:70)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at com.iplanet.server.http.servlet.NSServletRunner.invokeServletService(NSServletRunner.java:891)
     at com.iplanet.server.http.servlet.NSServletRunner.Service(NSServletRunner.java:458)
It seems i have to do some path settings in my iplenet web server.
If some one have faced the problem i would be glad to know the solution for this, i am literally bugged up,....

How to use JMX with oc4j

is there any document about how to use JMX with OC4J? the intention is that I would like to create an application, using JMX to manage OC4J, such dynamiclly adding connection pool, create data source. potentially, restart server, application ...
is there any document about this?
Thanks

In addition to that, the documentation also has a section on accessing OC4J JMX/MBeans:
http://otndnld.oracle.co.jp/document/products/as10g/101300/B25221_03/web.1013/b14433/mbeans.htm#sthref163
The blog below also has examples, albeit from a Groovy perspective, but nonetheless, examples of how it can be done easily translated into Java:
http://buttso.blogspot.com/search?q=jmx
-steve-

Using Toplink with Servlets in a Clustered application server

I am having some problems with Toplink.
Basically, I have a collection of HttpServlets that manipulate a domain object and its various collections of objects. The general technique is to place the domain object in the HttpSession, and have each Servlet modify this object by retrieving it, modifying it, and storing it when necessary. The problem is that since this application is running in a clustered environment, the object in the session may or may not be the same object returned from Toplink. It may be a serialized clone of the object from another server on the cluster.
This has caused several problems. First, if I am using indirction for the collections, when the domain object is deserializaed, it throws an exception when it tries to instantiate the indirection. Next, when trying to store the object, it is not registered with a unit of work, and I am not sure how to properly account for this. Third, there is a many to many relationship. The user may pick one such object, and add it to the domain object being manipulated. This seems to cause problems when the object is read from Toplink, and added to the domain object that is a serialized clone.
Anyway, my question is, what is the general pattern for handling an object being manipulated on a HttpSession in a clustered environment, where this object(s) may or may not be the actual objects returned from Toplink? My goal is to have a factory return one DatabaseSession per cluster server, and be able to load, store, and manipulate these objects in the HttpSession.
Here is an attempt at code:
import java.io.*;
import java.util.*;
import oracle.toplink.expressions.*;
import oracle.toplink.sessions.*;
public class DataAccess
private static Project project = new MyToplinkProject();
private static DatabaseSession session;
private UnitOfWork unit;
public DataAccess()
unit = getDatabaseSession().acquireUnitOfWork();
public ArrayList getAllCustomers()
Vector v = (Vector) session.readAllObjects(Customer.class);
return new ArrayList(v);
public Customer getCustomerForUpdate(Customer c)
Customer custCopy = (Customer) unit.readObject(c);
return (Customer) unit.registerObject(c);
public Form getCustomer(String id)
ExpressionBuilder builder = new ExpressionBuilder();
Expression exp = builder.get("id").equal(id);
return (Customer) session.readObject(Customer.class, exp);
public void saveCustomer(Customer cust)
unit.deepMergeClone(cust);
unit.commitAndResume();
private synchronized DatabaseSession getDatabaseSession()
if (session == null)
session = project.createDatabaseSession();
session.login();
session.setLog(new PrintWriter(System.out));
session.logMessages();
return session;
public void destruct()
release();
public void release()
unit.release();
session.release();
Anyway, from this code I hope you can see what I am trying to do. The basic idea is that a Customer object provided for store and update may or may not be a serialized copy. Also, the object returned from a read may be serialized before the indirction is attempted.
Thanks for any help,
Jason Wilson

Hi Jason
A single static DatabaseSession and a single static UnitOfWork is not the recommended way of working with TopLink from a servlet. Our recommendation is that you create a single ServerSession object and that every time a servlet needs to interact with a TopLink Session, the servlet first acquires a ClientSession from this ServerSession object and possibly acquires UnitOfWork from the ClientSession. A UnitOfWork is not intended to be shared by servlets, or by different clients.
Basically, what you're attempting to do with the DatabaseSession is something we would recommend that you do instead with a ServerSession/ClientSessions combination.
As for working with persistent objects that you store in an HttpSession, I will try to give you some relevant background. First off, the UnitOfWork is intended to be used to manage the changes to a set of objects in a SINGLE TRANSACTION. It is always much easier to manage if these transactions are short-lived (ie if there is one transaction per ServletRequest.
However, the fact that you are talking about storing objects in the HttpSession makes me think that you are also considering long-running transactions that are may be spread out over several ServletRequests. You should definately consider this decision very carefully. If you want to continually edit an object that is stored in the HttpSession, then we need to consider how to manage when the object's changes should be committed to the database and how to manage concurrency when two users have the same object in their respective HttpSession objects.
One idea is not to store the actual object in the HttpSession but instead to store the "id" of the object (something that you can use to find the correct object when the same user makes another request). So servlets always:
-acquireClientSession
-find the object that they are working with (based on information in the HttpSession)
-if the object is to be edited then a UnitOfWork provides clones of the object (this isolates you from changes that some other user makes to the same object)
-at the end, commit the changes to the object.
When the user makes another request, the object they read will have their changes. So, functionally, this is the same as storing the actual object in the HttpSession, except TopLink can provide proper ACID behavior for any updates that you decide to make. And don't worry about the added "expense" of having to query at the beginning of each servlet request; if you are storing the "id" of the object in your HttpSession, then you a simple cache hit is all that is required to get back the correct object. You don't have to go the database at all.
JIM

Possible to use PHP with servlets?

Hello all,
This may be a weird question, but here goes. I have a java web app that uses Servlets with a JBoss appserve and Interbase db. I am interested in using a php library in my application, is it possible to write php code within my java code to be deployed in my app? Does that even make sense? (I must admit, i have no knowledge of PHP)
Does anyone have any experience with something of this nature?
Thanks,
-Kevin

No, it doesn't really make sense.
You can have a PHP application and a Java application installed on the same server and have them interact, but that's probably a lot more hassle than it's worth.

Using JMX with ORB lookup service

Hello,
I am trying to use an ORB lookup service to register different MBeanServers (or maybe more approriate JMXConnectorServers) for later lookup.
This works fine, if the lookup service and the MBeanServer run in two separate processes. But if I try to register the MBeanServer running in the lookup service process itself, a CORBA exception is thrown:
#WARN    * 09/19/2006 05:48:54.583 * CID 340832833(SEQ 0) * [monitoring.MonitoringComponentImpl] * basecomponents.monitoring.CANNOT_CREATE_JMXCONNECTOR * Error trying to create JMXConnector for URL service:jmx:iiop:///jndi/iiop://localhost:9003/MONITORING-NS_Server-DM_NS_1
        java.rmi.RemoteException: CORBA SystemException; nested exception is:
        org.omg.CORBA.NO_IMPLEMENT:   vmcid: 0x0 minor code: 0 completed: No
        at com.sun.corba.se.impl.presentation.rmi.StubConnectImpl.connect(StubConnectImpl.java:93)
        at com.sun.corba.se.impl.javax.rmi.CORBA.StubDelegateImpl.connect(StubDelegateImpl.java:161)
        at javax.rmi.CORBA.Stub.connect(Stub.java:138)
        at javax.management.remote.rmi.RMIConnector.connectStub(RMIConnector.java:1657)
        at javax.management.remote.rmi.RMIConnectorServer.objectToBind(RMIConnectorServer.java:738)
        at javax.management.remote.rmi.RMIConnectorServer.start(RMIConnectorServer.java:394)
Caused by: org.omg.CORBA.NO_IMPLEMENT:   vmcid: 0x0 minor code: 0 completed: No
        at org.openorb.CORBA.ORB.connect(Unknown Source)
        at org.omg.stub.javax.management.remote.rmi._RMIServerImpl_Tie.orb(Unknown Source)
        at com.sun.corba.se.impl.presentation.rmi.StubConnectImpl.connect(StubConnectImpl.java:70)
        ... 13 moreThe URL used is comparable for all processes (working and failing).
The call that is supposed to register the MBeanServer at the lookup service is:
JMXConnectorServerFactory.newJMXConnectorServer(jmxUrl, environment, this.mBeanServer);
...This call also is the same for all processes.
I have had a look into the sources of OpenORB (the source of the exception above) and it seems that ORB.connect() tries to find a BOA; but as this BOA is null, the exception is thrown. Still, I don't know, why other processes are able to register without exception.
Anybody with a clue on how to fix this?
Thanks in advance.

All it should need is the oc4j-administrators role be assigned to the user you want to use.
These are the relevant entries I have in the j2ee/home/config/system-jazn-data.xml file for my OC4J instance. I can connect to this instance from a remote JConsole application using the new username.
<user>
<name>sbutton</name>
<display-name>Steve Button</display-name>
<guid>954C331156C411DCAF5FA79F89986A89</guid>
<description>Cool user</description>
<credentials>{903}fEqTtDaZa5MaNYf3NnGJkkGmQvTH7Q9n</credentials>
</user>
<role>
<name>oc4j-administrators</name>
<display-name>OC4J Admin Role</display-name>
<description>Administrative role for OC4J</description>
<guid>DDCC5BF225DD11DCBFE9D1ECB4808E5D</guid>
<members>
<member>
     <type>user</type>
     <name>oc4jadmin</name>
</member>
<member>
     <type>user</type>
     <name>JtaAdmin</name>
</member>
<member>
     <type>user</type>
     <name>sbutton</name>
</member>
</members>
</role>
...

How to use jni with ervlets

Hi
i was trying to do some example with JNI. I can use JNI with standalone Java application but I just cannot figure out how I can use JNI with Servlet.
Can some one show me a sample code using JNI with Servlets.
thanks very much

JNI is done in servlets that same way as other java.
I suspect your problem is in the environment and perhaps how servlets work. It doesn't have anything to do with JNI itself.

JMX with apache plugin and weblogic

Hy every body
I use weblogic 9.1, throw apache plugin
I try to get mbean with JMX,
i have this error on the log of the server when I try to acces to a server by passing apache url into jmxConnector:
java.lang.AssertionError: Assertion violated
     at weblogic.utils.Debug.assertion(Debug.java:57)
     at weblogic.iiop.MuxableSocketIIOP.getMessageLength(MuxableSocketIIOP.java:315)
     at weblogic.socket.AbstractMuxableSocket.isMessageComplete(AbstractMuxableSocket.java:336)
     at weblogic.socket.MuxableSocketDiscriminator.dispatch(MuxableSocketDiscriminator.java:166)
     at weblogic.socket.NTSocketMuxer.processSockets(NTSocketMuxer.java:105)
     at weblogic.socket.SocketReaderRequest.run(SocketReaderRequest.java:29)
     at weblogic.socket.SocketReaderRequest.execute(SocketReaderRequest.java:42)
     at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:145)
     at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:117)
the log:
================New Request: [GIOP] =================
Tue May 31 14:25:36 2011 <35921306844736112> INFO: SSL is not configured
Tue May 31 14:25:36 2011 <35921306844736112> Using Uri /
Tue May 31 14:25:36 2011 <35921306844736112> After trimming path: '/'
Tue May 31 14:25:36 2011 <35921306844736112> The final request string is '/'
Tue May 31 14:25:36 2011 <35921306844736112> SEARCHING id=[192.168.2.83:7001] from current ID=[192.168.2.83:7001]
Tue May 31 14:25:36 2011 <35921306844736112> The two ids matched
Tue May 31 14:25:36 2011 <35921306844736112> @@@FOUND...id=[192.168.2.83:7001], server_name=[AdminServer], server_port=[80]
Tue May 31 14:25:36 2011 <35921306844736112> attempt #0 out of a max of 5
Tue May 31 14:25:36 2011 <35921306844736112> Trying a pooled connection for '192.168.2.83/7001/7001'
Tue May 31 14:25:36 2011 <35921306844736112> getPooledConn: No more connections in the pool for Host[192.168.2.83] Port[7001] SecurePort[7001]
Tue May 31 14:25:36 2011 <35921306844736112> general list: trying connect to '192.168.2.83'/7001/7001 at line 2724 for '/'
Tue May 31 14:25:36 2011 <35921306844736112> INFO: New NON-SSL URL
Tue May 31 14:25:36 2011 <35921306844736112> Connect returns -1, and error no set to 10035, msg 'Unknown error'
Tue May 31 14:25:36 2011 <35921306844736112> EINPROGRESS in connect() - selecting
Tue May 31 14:25:36 2011 <35921306844736112> Local Port of the socket is 2039
Tue May 31 14:25:36 2011 <35921306844736112> Remote Host 192.168.2.83 Remote Port 7001
Tue May 31 14:25:36 2011 <35921306844736112> general list: created a new connection to '192.168.2.83'/7001 for '/', Local port:2039
Tue May 31 14:25:36 2011 <35921306844736112> URL::sendHeaders(): meth='GIOP' file='/' protocol='HTTP/0.9'
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[Connection]=[Keep-Alive]
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[WL-Proxy-SSL]=[false]
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[WL-Proxy-Client-IP]=[192.168.0.143]
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[Proxy-Client-IP]=[192.168.0.143]
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[X-Forwarded-For]=[192.168.0.143]
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[X-WebLogic-KeepAliveSecs]=[24]
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[X-WebLogic-Force-JVMID]=[unset]
Tue May 31 14:25:36 2011 <35921306844736112> readStatus: Local port of the socket 2039, connected to Remote Host/Port 192.168.2.83/7001
Tue May 31 14:25:36 2011 <35921306844736112> readStatus: Response contains no data - isRecycled: 0
Tue May 31 14:25:36 2011 <35921306844736112> *******Exception type [READ_ERROR_FROM_SERVER] (Unexpected EOF reading HTTP status - failover request based on Idempotent flag) raised at line 841 of ../nsapi/URL.cpp
Tue May 31 14:25:36 2011 <35921306844736112> Marking 192.168.2.83:7001 as bad
Tue May 31 14:25:36 2011 <35921306844736112> got exception in sendRequest phase: READ_ERROR_FROM_SERVER [os error=0, line 841 of ../nsapi/URL.cpp]: Unexpected EOF reading HTTP status - failover request based on Idempotent flag at line 3160
Tue May 31 14:25:36 2011 <35921306844736112> Failing over after sendRequest() exception: READ_ERROR_FROM_SERVER as Idempotent is set to ON
Tue May 31 14:25:36 2011 <35921306844736112> attempt #1 out of a max of 5
Tue May 31 14:25:36 2011 <35921306844736112> general list: trying connect to '192.168.2.83'/7001/7001 at line 2724 for '/'
Tue May 31 14:25:36 2011 <35921306844736112> INFO: New NON-SSL URL
Tue May 31 14:25:36 2011 <35921306844736112> Connect returns -1, and error no set to 10035, msg 'Unknown error'
Tue May 31 14:25:36 2011 <35921306844736112> EINPROGRESS in connect() - selecting
Tue May 31 14:25:36 2011 <35921306844736112> Local Port of the socket is 2040
Tue May 31 14:25:36 2011 <35921306844736112> Remote Host 192.168.2.83 Remote Port 7001
Tue May 31 14:25:36 2011 <35921306844736112> general list: created a new connection to '192.168.2.83'/7001 for '/', Local port:2040
Tue May 31 14:25:36 2011 <35921306844736112> URL::sendHeaders(): meth='GIOP' file='/' protocol='HTTP/0.9'
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[Connection]=[Keep-Alive]
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[WL-Proxy-SSL]=[false]
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[WL-Proxy-Client-IP]=[192.168.0.143]
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[Proxy-Client-IP]=[192.168.0.143]
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[X-Forwarded-For]=[192.168.0.143]
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[X-WebLogic-KeepAliveSecs]=[24]
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[X-WebLogic-Force-JVMID]=[unset]
Tue May 31 14:25:36 2011 <35921306844736112> readStatus: Local port of the socket 2040, connected to Remote Host/Port 192.168.2.83/7001
Tue May 31 14:25:36 2011 <35921306844736112> readStatus: Response contains no data - isRecycled: 0
Tue May 31 14:25:36 2011 <35921306844736112> *******Exception type [READ_ERROR_FROM_SERVER] (Unexpected EOF reading HTTP status - failover request based on Idempotent flag) raised at line 841 of ../nsapi/URL.cpp
Tue May 31 14:25:36 2011 <35921306844736112> Marking 192.168.2.83:7001 as bad
Tue May 31 14:25:36 2011 <35921306844736112> got exception in sendRequest phase: READ_ERROR_FROM_SERVER [os error=0, line 841 of ../nsapi/URL.cpp]: Unexpected EOF reading HTTP status - failover request based on Idempotent flag at line 3160
Tue May 31 14:25:36 2011 <35921306844736112> Failing over after sendRequest() exception: READ_ERROR_FROM_SERVER as Idempotent is set to ON
Tue May 31 14:25:36 2011 <35921306844736112> attempt #2 out of a max of 5
Tue May 31 14:25:36 2011 <35921306844736112> general list: trying connect to '192.168.2.83'/7001/7001 at line 2724 for '/'
Tue May 31 14:25:36 2011 <35921306844736112> INFO: New NON-SSL URL
Tue May 31 14:25:36 2011 <35921306844736112> Connect returns -1, and error no set to 10035, msg 'Unknown error'
Tue May 31 14:25:36 2011 <35921306844736112> EINPROGRESS in connect() - selecting
Tue May 31 14:25:36 2011 <35921306844736112> Local Port of the socket is 2041
Tue May 31 14:25:36 2011 <35921306844736112> Remote Host 192.168.2.83 Remote Port 7001
Tue May 31 14:25:36 2011 <35921306844736112> general list: created a new connection to '192.168.2.83'/7001 for '/', Local port:2041
Tue May 31 14:25:36 2011 <35921306844736112> URL::sendHeaders(): meth='GIOP' file='/' protocol='HTTP/0.9'
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[Connection]=[Keep-Alive]
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[WL-Proxy-SSL]=[false]
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[WL-Proxy-Client-IP]=[192.168.0.143]
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[Proxy-Client-IP]=[192.168.0.143]
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[X-Forwarded-For]=[192.168.0.143]
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[X-WebLogic-KeepAliveSecs]=[24]
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[X-WebLogic-Force-JVMID]=[unset]
Tue May 31 14:25:36 2011 <35921306844736112> readStatus: Local port of the socket 2041, connected to Remote Host/Port 192.168.2.83/7001
Tue May 31 14:25:36 2011 <35921306844736112> readStatus: Response contains no data - isRecycled: 0
Tue May 31 14:25:36 2011 <35921306844736112> *******Exception type [READ_ERROR_FROM_SERVER] (Unexpected EOF reading HTTP status - failover request based on Idempotent flag) raised at line 841 of ../nsapi/URL.cpp
Tue May 31 14:25:36 2011 <35921306844736112> Marking 192.168.2.83:7001 as bad
Tue May 31 14:25:36 2011 <35921306844736112> got exception in sendRequest phase: READ_ERROR_FROM_SERVER [os error=0, line 841 of ../nsapi/URL.cpp]: Unexpected EOF reading HTTP status - failover request based on Idempotent flag at line 3160
Tue May 31 14:25:36 2011 <35921306844736112> Failing over after sendRequest() exception: READ_ERROR_FROM_SERVER as Idempotent is set to ON
Tue May 31 14:25:36 2011 <35921306844736112> attempt #3 out of a max of 5
Tue May 31 14:25:36 2011 <35921306844736112> general list: trying connect to '192.168.2.83'/7001/7001 at line 2724 for '/'
Tue May 31 14:25:36 2011 <35921306844736112> INFO: New NON-SSL URL
Tue May 31 14:25:36 2011 <35921306844736112> Connect returns -1, and error no set to 10035, msg 'Unknown error'
Tue May 31 14:25:36 2011 <35921306844736112> EINPROGRESS in connect() - selecting
Tue May 31 14:25:36 2011 <35921306844736112> Local Port of the socket is 2042
Tue May 31 14:25:36 2011 <35921306844736112> Remote Host 192.168.2.83 Remote Port 7001
Tue May 31 14:25:36 2011 <35921306844736112> general list: created a new connection to '192.168.2.83'/7001 for '/', Local port:2042
Tue May 31 14:25:36 2011 <35921306844736112> URL::sendHeaders(): meth='GIOP' file='/' protocol='HTTP/0.9'
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[Connection]=[Keep-Alive]
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[WL-Proxy-SSL]=[false]
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[WL-Proxy-Client-IP]=[192.168.0.143]
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[Proxy-Client-IP]=[192.168.0.143]
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[X-Forwarded-For]=[192.168.0.143]
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[X-WebLogic-KeepAliveSecs]=[24]
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[X-WebLogic-Force-JVMID]=[unset]
Tue May 31 14:25:36 2011 <35921306844736112> readStatus: Local port of the socket 2042, connected to Remote Host/Port 192.168.2.83/7001
Tue May 31 14:25:36 2011 <35921306844736112> readStatus: Response contains no data - isRecycled: 0
Tue May 31 14:25:36 2011 <35921306844736112> *******Exception type [READ_ERROR_FROM_SERVER] (Unexpected EOF reading HTTP status - failover request based on Idempotent flag) raised at line 841 of ../nsapi/URL.cpp
Tue May 31 14:25:36 2011 <35921306844736112> Marking 192.168.2.83:7001 as bad
Tue May 31 14:25:36 2011 <35921306844736112> got exception in sendRequest phase: READ_ERROR_FROM_SERVER [os error=0, line 841 of ../nsapi/URL.cpp]: Unexpected EOF reading HTTP status - failover request based on Idempotent flag at line 3160
Tue May 31 14:25:36 2011 <35921306844736112> Failing over after sendRequest() exception: READ_ERROR_FROM_SERVER as Idempotent is set to ON
Tue May 31 14:25:36 2011 <35921306844736112> attempt #4 out of a max of 5
Tue May 31 14:25:36 2011 <35921306844736112> general list: trying connect to '192.168.2.83'/7001/7001 at line 2724 for '/'
Tue May 31 14:25:36 2011 <35921306844736112> INFO: New NON-SSL URL
Tue May 31 14:25:36 2011 <35921306844736112> Connect returns -1, and error no set to 10035, msg 'Unknown error'
Tue May 31 14:25:36 2011 <35921306844736112> EINPROGRESS in connect() - selecting
Tue May 31 14:25:36 2011 <35921306844736112> Local Port of the socket is 2043
Tue May 31 14:25:36 2011 <35921306844736112> Remote Host 192.168.2.83 Remote Port 7001
Tue May 31 14:25:36 2011 <35921306844736112> general list: created a new connection to '192.168.2.83'/7001 for '/', Local port:2043
Tue May 31 14:25:36 2011 <35921306844736112> URL::sendHeaders(): meth='GIOP' file='/' protocol='HTTP/0.9'
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[Connection]=[Keep-Alive]
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[WL-Proxy-SSL]=[false]
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[WL-Proxy-Client-IP]=[192.168.0.143]
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[Proxy-Client-IP]=[192.168.0.143]
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[X-Forwarded-For]=[192.168.0.143]
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[X-WebLogic-KeepAliveSecs]=[24]
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[X-WebLogic-Force-JVMID]=[unset]
Tue May 31 14:25:36 2011 <35921306844736112> readStatus: Local port of the socket 2043, connected to Remote Host/Port 192.168.2.83/7001
Tue May 31 14:25:36 2011 <35921306844736112> readStatus: Response contains no data - isRecycled: 0
Tue May 31 14:25:36 2011 <35921306844736112> *******Exception type [READ_ERROR_FROM_SERVER] (Unexpected EOF reading HTTP status - failover request based on Idempotent flag) raised at line 841 of ../nsapi/URL.cpp
Tue May 31 14:25:36 2011 <35921306844736112> Marking 192.168.2.83:7001 as bad
Tue May 31 14:25:36 2011 <35921306844736112> got exception in sendRequest phase: READ_ERROR_FROM_SERVER [os error=0, line 841 of ../nsapi/URL.cpp]: Unexpected EOF reading HTTP status - failover request based on Idempotent flag at line 3160
Tue May 31 14:25:36 2011 <35921306844736112> Failing over after sendRequest() exception: READ_ERROR_FROM_SERVER as Idempotent is set to ON
Tue May 31 14:25:36 2011 <35921306844736112> attempt #5 out of a max of 5
Tue May 31 14:25:36 2011 <35921306844736112> general list: trying connect to '192.168.2.83'/7001/7001 at line 2724 for '/'
Tue May 31 14:25:36 2011 <35921306844736112> INFO: New NON-SSL URL
Tue May 31 14:25:36 2011 <35921306844736112> Connect returns -1, and error no set to 10035, msg 'Unknown error'
Tue May 31 14:25:36 2011 <35921306844736112> EINPROGRESS in connect() - selecting
Tue May 31 14:25:36 2011 <35921306844736112> Local Port of the socket is 2044
Tue May 31 14:25:36 2011 <35921306844736112> Remote Host 192.168.2.83 Remote Port 7001
Tue May 31 14:25:36 2011 <35921306844736112> general list: created a new connection to '192.168.2.83'/7001 for '/', Local port:2044
Tue May 31 14:25:36 2011 <35921306844736112> URL::sendHeaders(): meth='GIOP' file='/' protocol='HTTP/0.9'
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[Connection]=[Keep-Alive]
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[WL-Proxy-SSL]=[false]
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[WL-Proxy-Client-IP]=[192.168.0.143]
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[Proxy-Client-IP]=[192.168.0.143]
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[X-Forwarded-For]=[192.168.0.143]
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[X-WebLogic-KeepAliveSecs]=[24]
Tue May 31 14:25:36 2011 <35921306844736112> Hdrs to WLS:[X-WebLogic-Force-JVMID]=[unset]
Tue May 31 14:25:36 2011 <35921306844736112> readStatus: Local port of the socket 2044, connected to Remote Host/Port 192.168.2.83/7001
Tue May 31 14:25:36 2011 <35921306844736112> readStatus: Response contains no data - isRecycled: 0
Tue May 31 14:25:36 2011 <35921306844736112> *******Exception type [READ_ERROR_FROM_SERVER] (Unexpected EOF reading HTTP status - failover request based on Idempotent flag) raised at line 841 of ../nsapi/URL.cpp
Tue May 31 14:25:36 2011 <35921306844736112> Marking 192.168.2.83:7001 as bad
Tue May 31 14:25:36 2011 <35921306844736112> got exception in sendRequest phase: READ_ERROR_FROM_SERVER [os error=0, line 841 of ../nsapi/URL.cpp]: Unexpected EOF reading HTTP status - failover request based on Idempotent flag at line 3160
Tue May 31 14:25:36 2011 <35921306844736112> Failing over after sendRequest() exception: READ_ERROR_FROM_SERVER as Idempotent is set to ON
Tue May 31 14:25:36 2011 <35921306844736112> request [] did NOT process successfully..................
the httpd.conf:
<IfModule mod_weblogic.c>
WebLogicHost 192.168.2.83
WebLogicPort 7001
#WebLogicCluster t3://192.168.2.83:7003, t3://192.168.2.83: 7005, t3://192.168.2.83:7013
Idempotent on
Debug HFC,HTW,HFW
WLLogFile c:/wlproxy.log
WLTempDir c:/TEMP
DebugConfigInfo On
KeepAliveEnabled ON
KeepAliveSecs 14
MatchExpression *
</IfModule>
<Location /HTTPClnt>
SetHandler weblogic-handler
</Location>
I don't use ssl.
I can access to the jsp of the server with the url of apach , but i cannot use jmx throught apache. I can use jmx with the server if I don't use apache, but i need apache for the next step of the project.
please, help me !

I think the plug-in is intended for serves static pages, and another part of the document like MIME types.
I assume you are using the http protocol in your client to establish a jmx connection. Try enabling HTTP tunneling in weblogic server.
Can you post the code used to establish connetion?

Jmx with java real time

Hi David,
my question for now is very general.
can we use jmx with jrts???
Gabi

Hi Gabi,
Some additional information:
- JavaRTS does support the JMX protocol
- JavaRTS supports most of the monitoring & management functionalities provided
by HotSpot MBeans
- some functionalities are disabled by default because they would create jitter (like
getting the stack trace of java threads). Default can be changed through the
realtime.debug MBean)
- JavaRTS comes with a few additional realtime specific monitoring beans.
Note that JMX relies on threads to do its work. These threads are not real-time.
Hence, if the realtime threads (including the RTGC) are consumming all the CPU,
you may not be able to call MBeans to see what is happening and take corrective actions.
Bertrand.

Implementing jdbc using jsp and servlets

please give me documnetation and few programs with code .
implementing or using jdbc with servlets and jsp.

please give me documnetation and few programs with
code .
implementing or using jdbc with servlets and jsp.Well, which do you want to do? Implement JDBC with servlets and JSP - a tricky job, but there's no technical reason why you couldn't for instance write a class which both extends HttpServlet and implements java.sql.Driver. Wouldn't recommend it, though

Dialogs with servlets

Hi
Does anyone know how to use dialogs with servlets? I'd like to show a confirm dialog on the client machine. My first idea was to use JOptionPane.showConfirmDialog as such in the servlet, but then of course de dialog pops-up on the server side, and not on client side.
Many thanks for the help,
Nic

You need to use javascript to confirm, ask questions, etc...
You can see :
http://www.webreference.com/programming/javascript/confirm/
Or
http://www.bodo.com/javacool.htm
Fred

Swings with servlets

Hi,
how we can use swings with servlets or jsps.
or
how we can display the browser in the swings.
please give me a valid answer with examples.

Hi,
Your question is not clear... are you trying to display HTML using swing components or are you trying to use swing in a server-side application?
Some Swing components (e.g. JLabel) natively support simple html, so:
JLabel lbl = new JLabel("<html>hello <b>world</b></html>");would result in a JLabel that looks with the word "world" in bold. If you need also frames, css and javascript support - you'll need to reach for a 3^rd^ party library, I'm afraid.
As for using swing in servers, look at this article:
http://today.java.net/pub/a/today/2006/04/20/bringing-swing-to-the-web.html
If you meant neither, please explain more.
Hope this helps, though.
Michael Bar-Sinai

Communicate with servlet after using Java Web Start?

Is it possible to communicate with servlet to get data back and forth
after using Web Start to download the client application?
The demos come with Java Web Start are applications which are
standalone, don't need communicate with the servlet on Web server
after being launched. I am wondering if it is possible, and how (HTTP
& JAX-RPC)?
Thanx in advance.

I've done this using HTTP. I get the server and port from the codebase:
BasicService bs = null;
try {
bs = (BasicService)ServiceManager.lookup("javax.jnlp.BasicService");
String codeBase = bs.getCodeBase().toString();
and use the java.net.HttpURLConnection and java.net.URL classes to send HTTP parameter values to the servlet and to receive results from the HttpURLConnection's input stream.

How to use HTTPS with JSSE URLConnection in servlet

Hi, I have a servlet that calls another servlet using the URLConnection class. This seems to work very well if I am using http. However when trying to call it using https using JSSE I get the following error:
"javax.net.ssl.SSLHandshakeException: untrusted server cert chain."
The following is the code that I am using in the servlet:
          java.security.Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());
          System.getProperties().put("java.protocol.handler.pkgs", "com.sun.net.ssl.internal.www.protocol");
          this.servlet = new URL(servletURL);
          URLConnection conServlet = servlet.openConnection();
Both of these servlets are under IIS on my machine. I am able to execute each of the servlets from the browser using https directly. Does this sounds like an SSL certifcate problem or is that something in the Java code? Any ideas greatly appreciated.

Hi,
Perhaps you can create your own trust manager. I've found this example in another newsgroup: (please note that this example trusts everyone, but you can modify the trust manager as you wish)
if (putUrl.startsWith("https"))
//set up to handle SSL if necessary
System.setProperty("java.protocol.handler.pkgs", "com.sun.net.ssl.internal.www.protocol");
System.setProperty("javax.net.debug", "ssl,handshake,data,trustmanager");
Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());
//use our own trust manager so we can always trust
//the URL entered in the configuration.
X509TrustManager tm = new MyX509TrustManager();
KeyManager []km = null;
TrustManager []tma = {tm};
SSLContext sc = SSLContext.getInstance("ssl");
sc.init(km,tma,new java.security.SecureRandom());
SSLSocketFactory sf1 = sc.getSocketFactory();
HttpsURLConnection.setDefaultSSLSocketFactory (sf1);
m_url = new URL (putUrl);
class MyX509TrustManager implements X509TrustManager {
public boolean isClientTrusted(X509Certificate[] chain) {
return true;
public boolean isServerTrusted(X509Certificate[] chain) {
return true;
public X509Certificate[] getAcceptedIssuers() {
return null;
}Hope this helps,
Kurt.

Best practice to monitor 10gR3 OSB performance using JMX API?

Hi guys,
I need some advice on the best practice to monitor 10gR3 OSB performance using JMX API.
Jus to show I have done my home work, I managed to get the JMX sample code from
http://download.oracle.com/docs/cd/E13159_01/osb/docs10gr3/jmx_monitoring/example.html#wp1109828
working.
The following is the list of options I am think about:
* Set up: I have a cluster of one 1 admin server with 2 managed servers, which managed server runs an instance of OSB
* What I try to achieve:
- use JMX API to collect OSB stats data periodically as in sample code above then save data as a record to a
     database table
Options/ideas:
1. Simplest approach: Run the modified version of JMX sample on the Admin Server to save stats data to database
regularly. I can't see problems with this one ...
2. Use WLI to schedule the Task of collecting stats data regularly. May be overkill if option 1 above is good for production
3. Deploy a simple web app on Admin Server, say a simple servlet that displays a simple page to start/stop and configure
data collection interval for the timer
What approach would you experts recommend?
BTW, the caveats os using JMX in http://download.oracle.com/docs/cd/E13159_01/osb/docs10gr3/jmx_monitoring/concepts.html#wp1095673
says
     Oracle strongly discourages using this API in a concurrent manner with more than one thread or process. This is because a reset performed in
     one thread or process is not visible to another threads or processes. This caveat also applies to resets performed from the Monitoring Dashboard of
     the Oracle Service Bus Console, as such resets are not visible to this API.
Under what scenario would I be breaking this rule? I am a little worried about its statement
     discourages using this API in a concurrent manner with more than one thread or process
Thanks in advance,
Sam

Hi Manoj,
Thanks for getting back. I am afraid configuring aggregation interval from Dashboard doesn't solve problem as I need to collect stats data of endpoint URI or in hourly or daily basis, then output to CSV files so line graphs can be drawn for chosen applications.
Just for those who may be interested. It's not possible to use SQL to query database tables to extract OSB stats for a specified time period, say 9am - 5pm. I raised a support case already and the response I got back is 'No'.
That means using JMX API will be the way to go :)
Has anyone actually done this kind of OSB stats report and care to give some pointers?
I am thinking of using 7 or 1 days as the aggregation interval set in Dashboard of OSB admin console then collects stats data using JMX(as described in previous link) hourly using WebLogic Server JMX Timer Service as described in
http://download.oracle.com/docs/cd/E12840_01/wls/docs103/jmxinst/timer.html instead of Java's Timer class.
Not sure if this is the best practice.
Thanks,
Regards,
Sam

Using JMX with servlets

Similar Messages

Maybe you are looking for