Continuous processing service in Java EE & Glassfish
I'm new to Java EE architechture but have been doing some reading on it, examining tutorials and practicing with simple EJB, web-service etc..
I have a application design type of question that I thought might be better to ask than to make up a solution that might not be the optimum one and not conform to the intended design "ideology".
What I want to do is to get a continuous data feed from a source into my server - i have a connecting J2SE API to get the data feed. Then I need to process the feed a little bit. And finally I want to have a client API which is used by remote computers to access ("subscribe") the feed on my server.
What would be a reasonable way to implement this logic in Glassfish Application server?
How should the connector to the external feed which is essentially a singleton be implemented, as a lifecycle module?
And what about messaging between the client API's any my server. I guess JMS with publish/subscribe, but how should the JMS publisher module be implemented in Glassfish as there should be only one instance?
Thanks for any insights on this. Would be nice to get an opinion before I start head on using some illogical architecture which will backfire at some point..
Hi,
look here:
<a href="http://help.sap.com/saphelp_nw04/helpdata/en/08/11703e5da3e946e10000000a114084/frameset.htm">http://help.sap.com/saphelp_nw04/helpdata/en/08/11703e5da3e946e10000000a114084/frameset.htm</a>
Regrads,
Boris
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Edited by: Benedict.Aluan on 05 30, 08 1:38 PM
Edited by: Benedict.Aluan on 05 30, 08 1:39 PMHello
Thanks a lot for your help ...
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Waiting 4 reply. -
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Thanks
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check out 102.invokingProcesses tutorials but not the jsp one.. look into rmi, and into the context properties.. That should help figuring out what/s wrong .. (looks like you try an in-container lookup)
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Message was edited by: NeerajGirolkar
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Thanks
~ Neeraj GirolkarHi Nilesh,
We tried to connect to Oracle Cloud Database using the way you suggested above, but unfortunately it is not working as well.
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Please let me know if you need any further information in this regard.
with regards,
RajaHi,
Core service p4 failed. J2EE Engine cannot be started.
com.sap.engine.frame.ServiceException: <--Localization failed: ResourceBundle='com.sap.engine.frame.KernelResourceBundle', ID='Can't assign requested addres
Please reboot the server to free up occupied ports. Later start the sap system.
Regards,
Deepak kori -
Error in web service creation : java.io.IOException: Non nillable element
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at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
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at java.lang.Thread.run(Unknown Source)
so, what is the error ?
error is in wsdl file..?
pls, help me...
its urgent...Melanie_Green wrote:
Thank him with duke stars :)The old dangling-dukes problems. While I really don't care about them, I think it's unfair to promise something and then not go along with the promise ...
Give them to Mel ;-) -
Servlet.service() Error. java.lang.OutOfMemoryError: Java heap space
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byte buf[] = new byte[1024];
int len;
while((len = stream.read(buf)) > 0){
output.write(buf, 0, len);
ImageIcon icon = new ImageIcon(output.toByteArray());
imageArray[imageIndex] = icon;
imageIndexArray[caseID][0] += 1;
imageIndexArray[caseID][imageID] = imageIndex;
++imageIndex;
} catch (IOException ex) {
log("Error, when reading byte array from image input stream from database");
} finally{
try {
stream.close();
output.close();
} catch (IOException ex) {
log("Error, when tring to close image input stream from Database");
} catch (ClassNotFoundException classNotFoundException) {//somecode...
} catch (SQLException sQLException) {//somecode...
}finally{
try {
conn.close();
} catch (SQLException ex) {//somecode...
String result;
if(examInfo != null && caseInfoArray != null && imageIndexArray != null && imageArray != null ){
result = "The transaction was successed!";
try {
oos.writeObject(examInfo);
oos.writeObject(caseInfoArray);
oos.writeObject(imageIndexArray);
oos.writeObject(imageArray);
} catch (IOException ex) {
result = "The transaction was failed!";
}else{
result = "The transaction was failed!";
return result;
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
ObjectInputStream inputStreamFromApplet = null;
Object object = null;
try {
inputStreamFromApplet = new ObjectInputStream(request.getInputStream());
object = inputStreamFromApplet.readObject();
ObjectOutputStream oos = new ObjectOutputStream(response.getOutputStream());
String returnValue = this.processObject(object, oos);
oos.writeObject(returnValue);
oos.flush();
oos.close();
} catch (ClassNotFoundException classNotFoundException) {
classNotFoundException.printStackTrace();
} finally{
inputStreamFromApplet.close();
} And the error messages I got here is:
SEVERE: Servlet.service() for servlet ExamViewerServlet threw exception
java.lang.OutOfMemoryError: Java heap space
at javax.swing.ImageIcon.writeObject(ImageIcon.java:411)
at sun.reflect.GeneratedMethodAccessor27.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:592)
at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:917)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1339)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1290)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1079)
at java.io.ObjectOutputStream.writeArray(ObjectOutputStream.java:1251)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1075)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:302)
at ExamViewerServlet.processObject(ExamViewerServlet.java:147)
at ExamViewerServlet.processRequest(ExamViewerServlet.java:176)
at ExamViewerServlet.doPost(ExamViewerServlet.java:217)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:390)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
at java.lang.Thread.run(Thread.java:595)Please help.
Linqing
Edited by: discovery_java on Feb 1, 2010 2:12 PMwire the code into a simple unit test, then run a profiler on it to see where the memory is going. You need the help of these kind of tools to track down memory issues, before that it is only guesswork what might be soaking it all up.
-
Invoke BPEL process using a java client - NullPointer Exception
Hi, We are trying to call a BPEL process using a java client from our Web Application. For some reason the BPEL engine just logs a NullPointerException and exits.
The same SOAP request when through SOAP UI tool works great.
Any help in resolving this is highly appreciated!
We are getting the below exception--
<2006-09-22 09:40:53,687> <DEBUG> <default.collaxa.cube.ws> SOAPRequestProvider
java.lang.NullPointerException
at com.collaxa.cube.ws.soap.oc4j.SOAPRequestProvider.processBPELMessage(SOAPRequestProvider.java:269)
at com.collaxa.cube.ws.soap.oc4j.SOAPRequestProvider.processMessage(SOAPRequestProvider.java:129)
at oracle.j2ee.ws.server.provider.ProviderProcessor.doEndpointProcessing(ProviderProcessor.java:869)
at oracle.j2ee.ws.server.WebServiceProcessor.invokeEndpointImplementation(WebServiceProcessor.java:349)
at oracle.j2ee.ws.server.provider.ProviderProcessor.doRequestProcessing(ProviderProcessor.java:460)
at oracle.j2ee.ws.server.WebServiceProcessor.processRequest(WebServiceProcessor.java:114)
at oracle.j2ee.ws.server.WebServiceProcessor.doService(WebServiceProcessor.java:96)
at oracle.j2ee.ws.server.WebServiceServlet.doPost(WebServiceServlet.java:177)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:763)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at com.evermind.server.http.ResourceFilterChain.doFilter(ResourceFilterChain.java:64)
at oracle.security.jazn.oc4j.JAZNFilter$1.run(JAZNFilter.java:396)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
at oracle.security.jazn.oc4j.JAZNFilter.doFilter(JAZNFilter.java:410)
at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:621)
at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:368)
at com.evermind.server.http.HttpRequestHandler.doProcessRequest(HttpRequestHandler.java:866)
at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:448)
at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:302)
at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:190)
at oracle.oc4j.network.ServerSocketReadHandler$SafeRunnable.run(ServerSocketReadHandler.java:260)
at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:303)
at java.lang.Thread.run(Thread.java:595)
-----------------Hi, We are trying to call a BPEL process using a java client from our Web Application. For some reason the BPEL engine just logs a NullPointerException and exits.
The same SOAP request when through SOAP UI tool works great.
Any help in resolving this is highly appreciated!
We are getting the below exception--
<2006-09-22 09:40:53,687> <DEBUG> <default.collaxa.cube.ws> SOAPRequestProvider
java.lang.NullPointerException
at com.collaxa.cube.ws.soap.oc4j.SOAPRequestProvider.processBPELMessage(SOAPRequestProvider.java:269)
at com.collaxa.cube.ws.soap.oc4j.SOAPRequestProvider.processMessage(SOAPRequestProvider.java:129)
at oracle.j2ee.ws.server.provider.ProviderProcessor.doEndpointProcessing(ProviderProcessor.java:869)
at oracle.j2ee.ws.server.WebServiceProcessor.invokeEndpointImplementation(WebServiceProcessor.java:349)
at oracle.j2ee.ws.server.provider.ProviderProcessor.doRequestProcessing(ProviderProcessor.java:460)
at oracle.j2ee.ws.server.WebServiceProcessor.processRequest(WebServiceProcessor.java:114)
at oracle.j2ee.ws.server.WebServiceProcessor.doService(WebServiceProcessor.java:96)
at oracle.j2ee.ws.server.WebServiceServlet.doPost(WebServiceServlet.java:177)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:763)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at com.evermind.server.http.ResourceFilterChain.doFilter(ResourceFilterChain.java:64)
at oracle.security.jazn.oc4j.JAZNFilter$1.run(JAZNFilter.java:396)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
at oracle.security.jazn.oc4j.JAZNFilter.doFilter(JAZNFilter.java:410)
at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:621)
at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:368)
at com.evermind.server.http.HttpRequestHandler.doProcessRequest(HttpRequestHandler.java:866)
at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:448)
at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:302)
at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:190)
at oracle.oc4j.network.ServerSocketReadHandler$SafeRunnable.run(ServerSocketReadHandler.java:260)
at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:303)
at java.lang.Thread.run(Thread.java:595)
----------------- -
Invoke BPEL process using a java client - NullPointerException
Hi, We are trying to call a BPEL process using a java client from our Web Application. For some reason the BPEL engine just logs a NullPointerException and exits.
The same SOAP request when through SOAP UI tool works great.
Any help in resolving this is highly appreciated!
We are getting the below exception--
<2006-09-22 09:40:53,687> <DEBUG> <default.collaxa.cube.ws> SOAPRequestProvider
java.lang.NullPointerException
at com.collaxa.cube.ws.soap.oc4j.SOAPRequestProvider.processBPELMessage(SOAPRequestProvider.java:269)
at com.collaxa.cube.ws.soap.oc4j.SOAPRequestProvider.processMessage(SOAPRequestProvider.java:129)
at oracle.j2ee.ws.server.provider.ProviderProcessor.doEndpointProcessing(ProviderProcessor.java:869)
at oracle.j2ee.ws.server.WebServiceProcessor.invokeEndpointImplementation(WebServiceProcessor.java:349)
at oracle.j2ee.ws.server.provider.ProviderProcessor.doRequestProcessing(ProviderProcessor.java:460)
at oracle.j2ee.ws.server.WebServiceProcessor.processRequest(WebServiceProcessor.java:114)
at oracle.j2ee.ws.server.WebServiceProcessor.doService(WebServiceProcessor.java:96)
at oracle.j2ee.ws.server.WebServiceServlet.doPost(WebServiceServlet.java:177)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:763)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at com.evermind.server.http.ResourceFilterChain.doFilter(ResourceFilterChain.java:64)
at oracle.security.jazn.oc4j.JAZNFilter$1.run(JAZNFilter.java:396)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
at oracle.security.jazn.oc4j.JAZNFilter.doFilter(JAZNFilter.java:410)
at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:621)
at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:368)
at com.evermind.server.http.HttpRequestHandler.doProcessRequest(HttpRequestHandler.java:866)
at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:448)
at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:302)
at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:190)
at oracle.oc4j.network.ServerSocketReadHandler$SafeRunnable.run(ServerSocketReadHandler.java:260)
at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:303)
at java.lang.Thread.run(Thread.java:595)
-----------------Hi,
Please ensure that you include the SOAP Header "SOAPAction" in your request. Most importantly, the value for that should be enclosed within double quotes.
For eg;
req.setRequestHeader("SOAPAction", '"process"'); -
How to catch date errors and continue processing in a PL/SQL procedure
I'm updating a date field with dates constructed from day, month and year fields. The incoming data has many instances of day and month that are not valid dates, ex 11 31 2007. There is no 31st day in November.
I would like to write a pl/sql script to scan the table containing these values and log the rows that produce conversion errors.
I thought I could do this with exceptions but there are no exceptions that correspond to the ORA-01847 error for mismatched day and month.
Here is what I tried (the print procedure is a local wrapper for DBMS_OUTPUT.put_line):
PROCEDURE date_check IS
start1 DATE ;
BEGIN
select to_date(nvl(yearcollected,'9999') ||'/'|| nvl(monthcollected,'01') ||'/'|| nvl(daycollected,'01'),'YYYY/MM/DD'))) into start1 from incoming_data where id=1 ;
BEGIN
update temp_test set test_date = start1 where id=1 ;
EXCEPTION
WHEN OTHERS THEN
print('Date error message from exception block');
END;
print('Processing continues after handling date exception') ;
END date_check ;
Is there a way to catch this kind of error and continue processing after logging a message?
-=beekyHi, Beeky,
There are lots of different error messages associated with bad dates. Rather than try to catch them all, I use a BEGIN ... EXCEPTION block that contains nothing but a TO_DATE call. This is one of the rare occassions when I think "EXCEPTION WHEN OTHERS" is okay,
The following function comes from a package. If you want to make a stand-alone function, remember to say " *CREATE OR REPLACE* FUNCTION ...".
-- ** t o _ d t **
-- to_dt attempts to convert in_txt (assumed to
-- be in the format of in_fmt_txt) to a DATE.
-- If the conversion works, to_dt returns the DATE.
-- If the conversion fails for any reason, to_dt returns in_err_dt.
FUNCTION to_dt
( in_txt IN VARCHAR2 -- to be converted
, in_fmt_txt IN VARCHAR2 DEFAULT 'DD-MON-YYYY' -- optional format
, in_err_dt IN DATE DEFAULT NULL
RETURN DATE
DETERMINISTIC
AS
BEGIN
-- Try to convert in_txt to a DATE. If it works, fine.
RETURN TO_DATE (in_txt, in_fmt_txt);
EXCEPTION -- If TO_DATE caused an error, then this is not a valid DATE: return in_err_dt
WHEN OTHERS
THEN
RETURN in_err_dt;
END to_dt
;
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