How to create parent and chile process in java
i'm beginning in java, and i want to ask something, please help me...
1. i want to ask how to create parent and child process in java???
example :
if have one window and explore menu, when i click the explore menu.
new window come out.
how if i close the parent window the child window will close too...
2. what is the method from runtime class to get available memory and Active Threads count
ONE way to do what you wanted is this.
class Parent{
Child c = new Child
allChildren.add(c);
//if close
iterate through list
(Child)allChildren.get(index).close();
ArrayList allChildren;
class Child{
public void close(){ }
i dont know if you can get the thread count. but you can
get the current thread by using System.
Memory: Runtime.freeMemory() .maxMemory() .totalMemory()
http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Runtime.html
Careful though you have to do a calculation to get the
actual memory because those 3 methods refer to freeMemory
of the CURRENT heap not the total memory.
i think its: total - (max - free)
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Hi,
I am developing " How to Create Online and Offline Forms in Web Dynpro " in nwds 7.0. This is standard example which is available at sdn. but when i run it gives me error like "
Failed to process request. Please contact your system administrator.
[Hide]
Error Summary
While processing the current request, an exception occured which could not be handled by the application or the framework.
If the information contained on this page doesn't help you to find and correct the cause of the problem, please contact your system administrator. To facilitate analysis of the problem, keep a copy of this error page. Hint: Most browsers allow to select all content, copy it and then paste it into an empty document (e.g. email or simple text file).
Root Cause
The initial exception that caused the request to fail, was:
java.lang.NullPointerException
at com.travelrequestapp.TravelRequestComView.wdDoInit(TravelRequestComView.java:97)
at com.travelrequestapp.wdp.InternalTravelRequestComView.wdDoInit(InternalTravelRequestComView.java:133)
at com.sap.tc.webdynpro.progmodel.generation.DelegatingView.doInit(DelegatingView.java:61)
at com.sap.tc.webdynpro.progmodel.controller.Controller.initController(Controller.java:215)
at com.sap.tc.webdynpro.progmodel.view.View.initController(View.java:445)
... 34 more
See full exception chain for details.
System Environment
Client
Web Dynpro Client Type HTML Client
User agent Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)
Version null
DOM version null
Client Type msie6
Client Type Profile ie6
ActiveX enabled
Cookies enabled
Frames enabled
Java Applets enabled
JavaScript enabled
Tables enabled
VB Script enabled
Server
Web Dynpro Runtime Vendor: SAP, build ID: 7.0009.20060804145649.0000 (release=645_VAL_REL, buildtime=2006-08-26:14:41:58[UTC], changelist=413534, host=pwdfm101), build date: Thu Feb 15 10:23:57 IST 2007
J2EE Engine 7.00 patchlevel
Java VM Java HotSpot(TM) Server VM, version:1.4.2_13-b06, vendor: Sun Microsystems Inc.
Operating system Windows 2003, version: 5.2, architecture: x86
Session & Other
Session Locale en_US
Time of Failure Mon Oct 29 12:13:24 IST 2007 (Java Time: 1193640204484)
Web Dynpro Code Generation Infos
local/TravelRequest
SapDictionaryGenerationCore 7.0006.20051128142640.0000 (release=645_VAL_REL, buildtime=2006-01-14:14:59:42[UTC], changelist=378068, host=PWDFM101.wdf.sap.corp)
SapDictionaryGenerationTemplates (unknown)
SapGenerationFrameworkCore 7.0006.20050713144242.0000 (release=645_VAL_REL, buildtime=2006-01-14:14:48:59[UTC], changelist=357697, host=PWDFM101.wdf.sap.corp)
SapIdeWebDynproCheckLayer 7.0006.20051128151834.0000 (release=645_VAL_REL, buildtime=2006-01-14:15:05:10[UTC], changelist=378108, host=PWDFM101.wdf.sap.corp)
SapMetamodelCommon 7.0006.20050929162929.0000 (release=645_VAL_REL, buildtime=2006-01-14:14:49:45[UTC], changelist=369752, host=PWDFM101.wdf.sap.corp)
SapMetamodelCore 7.0006.20050929162929.0000 (release=645_VAL_REL, buildtime=2006-01-14:14:49:38[UTC], changelist=369752, host=PWDFM101.wdf.sap.corp)
SapMetamodelDictionary 7.0006.20051128142655.0000 (release=645_VAL_REL, buildtime=2006-01-14:14:57:39[UTC], changelist=378069, host=PWDFM101.wdf.sap.corp)
SapMetamodelWebDynpro 7.0006.20051128151854.0000 (release=645_VAL_REL, buildtime=2006-01-14:15:02:09[UTC], changelist=378109, host=PWDFM101.wdf.sap.corp)
SapWebDynproGenerationCTemplates 7.0006.20060111154644.0000 (release=645_VAL_REL, buildtime=2006-01-14:15:18:33[UTC], changelist=384368, host=pwdfm101)
SapWebDynproGenerationCore 7.0006.20051128151834.0000 (release=645_VAL_REL, buildtime=2006-01-14:15:05:21[UTC], changelist=378108, host=PWDFM101.wdf.sap.corp)
SapWebDynproGenerationTemplates 7.0006.20060111154644.0000 (release=645_VAL_REL, buildtime=2006-01-14:15:18:33[UTC], changelist=384368, host=pwdfm101)
sap.com/tcwddispwda
No information available null
sap.com/tcwdcorecomp
No information available null
Detailed Error Information
Detailed Exception Chain
java.lang.NullPointerException
at com.travelrequestapp.TravelRequestComView.wdDoInit(TravelRequestComView.java:97)
at com.travelrequestapp.wdp.InternalTravelRequestComView.wdDoInit(InternalTravelRequestComView.java:133)
at com.sap.tc.webdynpro.progmodel.generation.DelegatingView.doInit(DelegatingView.java:61)
at com.sap.tc.webdynpro.progmodel.controller.Controller.initController(Controller.java:215)
at com.sap.tc.webdynpro.progmodel.view.View.initController(View.java:445)
at com.sap.tc.webdynpro.progmodel.controller.Controller.init(Controller.java:200)
at com.sap.tc.webdynpro.progmodel.view.ViewManager.getView(ViewManager.java:709)
at com.sap.tc.webdynpro.progmodel.view.ViewManager.bindRoot(ViewManager.java:579)
at com.sap.tc.webdynpro.progmodel.view.ViewManager.makeVisible(ViewManager.java:793)
at com.sap.tc.webdynpro.progmodel.view.ViewManager.performNavigation(ViewManager.java:296)
at com.sap.tc.webdynpro.clientserver.cal.ClientApplication.navigate(ClientApplication.java:767)
at com.sap.tc.webdynpro.clientserver.cal.ClientComponent.navigate(ClientComponent.java:873)
at com.sap.tc.webdynpro.clientserver.window.WindowPhaseModel.doNavigation(WindowPhaseModel.java:498)
at com.sap.tc.webdynpro.clientserver.window.WindowPhaseModel.processRequest(WindowPhaseModel.java:144)
at com.sap.tc.webdynpro.clientserver.window.WebDynproWindow.processRequest(WebDynproWindow.java:335)
at com.sap.tc.webdynpro.clientserver.cal.AbstractClient.executeTasks(AbstractClient.java:143)
at com.sap.tc.webdynpro.clientserver.session.ApplicationSession.doProcessing(ApplicationSession.java:299)
at com.sap.tc.webdynpro.clientserver.session.ClientSession.doApplicationProcessingStandalone(ClientSession.java:711)
at com.sap.tc.webdynpro.clientserver.session.ClientSession.doApplicationProcessing(ClientSession.java:665)
at com.sap.tc.webdynpro.clientserver.session.ClientSession.doProcessing(ClientSession.java:232)
at com.sap.tc.webdynpro.clientserver.session.RequestManager.doProcessing(RequestManager.java:152)
at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doContent(DispatcherServlet.java:62)
at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doPost(DispatcherServlet.java:53)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:390)
at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:264)
at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:347)
at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:325)
at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:887)
at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:241)
at com.sap.engine.services.httpserver.server.Client.handle(Client.java:92)
at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:148)
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at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:100)
at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:170)
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