[jBPM] - Re: Process Parameters through REST API?
by Thomas Setiabudi
Thomas Setiabudi [https://community.jboss.org/people/thomas.setiabudi] created the discussion
"Re: Process Parameters through REST API?"
To view the discussion, visit: https://community.jboss.org/message/752796#752796
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Hi Franck,
I tried the http://localhost:8080/gwt-console-server/rs/form/process/process_id/complete http://localhost:8080/gwt-console-server/rs/form/process/process_id/complete
here is my code
public String instantiateDemoEvaluation(String address, String username,
String reason, String processName) {
String responseString = "";
List<NameValuePair> formparams = new ArrayList<NameValuePair>();
formparams.add(new BasicNameValuePair("employee", "thomas"));
formparams.add(new BasicNameValuePair("reason", "test"));
HttpPost httpPost = new HttpPost(" http:// http://" + "localhost:8888"
+ "/gwt-console-server/rs/form/process/" + "com.sample.evaluation"
+ "/complete");
InputStreamReader inputStreamReader = null;
BufferedReader bufferedReader = null;
try {
UrlEncodedFormEntity entity = new UrlEncodedFormEntity(formparams,
"UTF-8");// UrlEncodedFormEntity(formparams,
// "multipart/form-data");
httpPost.setEntity(entity);
HttpResponse response = httpClient.execute(httpPost);
InputStream inputStream = response.getEntity().getContent();
inputStreamReader = new InputStreamReader(inputStream);
bufferedReader = new BufferedReader(inputStreamReader);
StringBuilder stringBuilder = new StringBuilder();
String line = bufferedReader.readLine();
while (line != null) {
stringBuilder.append(line);
line = bufferedReader.readLine();
}
responseString = stringBuilder.toString();
} catch (Exception e) {
throw new RuntimeException(e);
} finally {
if (inputStreamReader != null) {
try {
inputStreamReader.close();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
if (bufferedReader != null) {
try {
bufferedReader.close();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}
return responseString;
}
and I got this error
<html><head><title>JBoss Web/7.0.1.Final - Error report</title><style><!--H1 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:22px;} H2 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:16px;} H3 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:14px;} BODY {font-family:Tahoma,Arial,sans-serif;color:black;background-color:white;} B {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;} P {font-family:Tahoma,Arial,sans-serif;background:white;color:black;font-size:12px;}A {color : black;}A.name {color : black;}HR {color : #525D76;}--></style> </head><body><h1>HTTP Status 500 - </h1><HR size="1" noshade="noshade"><p><b>type</b> Exception report</p><p><b>message</b> <u></u></p><p><b>description</b> <u>The server encountered an internal error () that prevented it from fulfilling this request.</u></p><p><b>exception</b> <pre>org.jboss.resteasy.spi.UnhandledException: java.lang.RuntimeException: Timeout : unable to retrieve Task org.jboss.resteasy.core.SynchronousDispatcher.unwrapException(SynchronousDispatcher.java:345) org.jboss.resteasy.core.SynchronousDispatcher.handleApplicationException(SynchronousDispatcher.java:321) org.jboss.resteasy.core.SynchronousDispatcher.handleException(SynchronousDispatcher.java:214) org.jboss.resteasy.core.SynchronousDispatcher.handleInvokerException(SynchronousDispatcher.java:190) org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:534) org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:496) org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:119) org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:208) org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:55) org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:50) javax.servlet.http.HttpServlet.service(HttpServlet.java:847) org.jboss.bpm.console.server.util.GWTJsonFilter.doFilter(GWTJsonFilter.java:59)</pre></p><p><b>root cause</b> <pre>java.lang.RuntimeException: Timeout : unable to retrieve Task org.jbpm.task.service.responsehandlers.BlockingGetTaskResponseHandler.getTask(BlockingGetTaskResponseHandler.java:41) org.jbpm.task.service.SyncTaskServiceWrapper.getTask(SyncTaskServiceWrapper.java:369) org.jbpm.integration.console.forms.TaskFormDispatcher.provideForm(TaskFormDispatcher.java:64) org.jbpm.integration.console.forms.FormDispatcherComposite.provideForm(FormDispatcherComposite.java:50) org.jboss.bpm.console.server.FormProcessingFacade.provideForm(FormProcessingFacade.java:205) org.jboss.bpm.console.server.FormProcessingFacade.renderTaskUI(FormProcessingFacade.java:127) sun.reflect.GeneratedMethodAccessor101.invoke(Unknown Source) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) java.lang.reflect.Method.invoke(Method.java:597) org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:140) org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod.java:255) org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:220) org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:209) org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:519) org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:496) org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:119) org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:208) org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:55) org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:50) javax.servlet.http.HttpServlet.service(HttpServlet.java:847) org.jboss.bpm.console.server.util.GWTJsonFilter.doFilter(GWTJsonFilter.java:59)</pre></p><p><b>note</b> <u>The full stack trace of the root cause is available in the JBoss Web/7.0.1.Final logs.</u></p><HR size="1" noshade="noshade"><h3>JBoss Web/7.0.1.Final</h3></body></html>
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13 years, 8 months
[Beginner's Corner] - JBoss and HSQLDB User Interface
by nilabhra banerjee
nilabhra banerjee [https://community.jboss.org/people/nill] created the discussion
"JBoss and HSQLDB User Interface"
To view the discussion, visit: https://community.jboss.org/message/752794#752794
--------------------------------------------------------------
I have recently put hsqldb to keep data in memory. I configured JBOSS standalone-full.xml to run. (The config snippet is given below)
When I start my JBoss application I am able to create tables and do data operations on those tables easily....but while my application is running, I also wish to see the tables and the data in an user interface. I tried to use Squirrel and HSqldb swing. These instances are connecting to the database but not showing any element I created, not even the schema I am using.
Config snippet
*****************
<datasource jta="true" jndi-name="java:/InMemoryDB" pool-name="InMemoryDB" enabled="true" use-java-context="true" use-ccm="true">
<connection-url>jdbc:hsqldb:mem:inmemorydb</connection-url>
<driver>hsqldb</driver>
<pool>
<min-pool-size>10</min-pool-size>
<max-pool-size>100</max-pool-size>
<prefill>true</prefill>
<flush-strategy>FailingConnectionOnly</flush-strategy>
</pool>
<security>
<user-name>sa</user-name>
</security>
</datasource>
<drivers>
<driver name="hsqldb" module="org.hsqldb">
<driver-class>org.hsqldb.jdbcDriver</driver-class>
</driver>
</drivers>
</datasources>
**********************
HSQDB UI :
c:\jboss-as-7.1.1.Final\modules\org\hsqldb\main>java -cp hsqldb.jar org.hsqldb.u
til.DatabaseManagerSwing
(Same jar locations as in JBoss)
Done similarly in Squirrel.
url I tried with
a) jdbc:hsqldb:mem:inmemorydb://localhost:1701
b) jdbc:hsqldb:mem:inmemorydb
I am using "sa"/"<blank>" as user credentials everywhere.
*****************************
Can anybody find out what wrong I am doing ?
Thanks a ton in advance for helping me out.
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13 years, 8 months
[Beginner's Corner] - Problem with my first EJB application
by Liberino Covelli
Liberino Covelli [https://community.jboss.org/people/rino.covelli] created the discussion
"Problem with my first EJB application"
To view the discussion, visit: https://community.jboss.org/message/752694#752694
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Dear friends , i have a problem with my first EJB application.
I hava create this bussiness interface
package ejb;
import javax.ejb.Local;
import javax.ejb.Remote;
@Local
public interface CountryCapital {
public String capitalName(String countryName);
}
I have create a SessionBean
package ejb;
import javax.ejb.EJB;
import javax.ejb.Stateless;
@Stateless
public class CountryCapitalBean implements CountryCapital,CountryCapitalLocal{
public String capitalName(String countryName)
{
String capital=new String("No such country");
if (countryName.equalsIgnoreCase("India"))
{
capital="New Delhi";
}
if (countryName.equalsIgnoreCase("United States Of America"))
{
capital="Washington DC";
}
if (countryName.equalsIgnoreCase("China"))
{
capital="Beijing";
}
return capital;
}
}
Finally, I implemented a client and wanted to inject the bean but it does not work
package appclient;
import javax.ejb.EJB;
public class ApplicationClient {
@EJB
private static CountryCapital countryCapital;
public static void main(String [] args){
countryCapital.capitalName("India");
}
}
This is the error , the injection does not work
Exception in thread "main" java.lang.NullPointerException
at appclient.ApplicationClient.main(ApplicationClient.java:25)
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13 years, 8 months
[jBPM] - Simulation in jBPM
by Maciej Swiderski
Maciej Swiderski [https://community.jboss.org/people/swiderski.maciej] modified the document:
"Simulation in jBPM"
To view the document, visit: https://community.jboss.org/docs/DOC-19261
--------------------------------------------------------------
This article describes main components of the jbpm simulation module that was introduced http://mswiderski.blogspot.com/2012/08/simulation-in-jbpm-draft.html on this blog. It is recommended to read it first to be able to follow this article which provides technical insight into the module while the blog talks mainly about simulation in general with examples and references to jbpm simulation module as a whole.
+*First of all - please keep in mind that this is an experimental module and subject to change, none of the following components are considered stable and can (and probably will) change so I would like to encourage you to leave your feedback and requirements.*+
As mentioned in the blog, simulation module consist of two components:
* path finder
* simulation engine extension
*Path finder*
Path finder is responsible for determining alternative paths in a given process. Following diagram illustrates main interfaces/classes of that component:
https://community.jboss.org/servlet/JiveServlet/showImage/102-19261-1-191... https://community.jboss.org/servlet/JiveServlet/downloadImage/102-19261-1...
As the diagram is rather simple and explains it self some clarification is required about the interfaces and classes that realize them.
PathContext - representation of an alternative path of the process, that holds both path elements such as nodes and sequence flows and some internal state
PathFinder - is the main interface that should be provided to build up a list of PathContext instances
PathFormatConverter - provides a convenient hook into the path finder to instruct it what should be the format returned from the finder if default (PathContext) is not enough
PathFinderFactory - just a factory to create instances of PathFinder
BPMN2PathFinderImpl - default implementation that is capable of determining paths of a BPMN2 process and supports following:
* determining paths of the entire process
* determining paths of a embedded sub process
JSONPathFormatConverter - converts result of the find path mechanism into JSON data model that is consumed but jBPM web designer
SimulationFilterPathFormatConverter - converts result of the find path mechanism that are required as input for simulation
*Simulation engine extension*
simulation engine extension allows to employ jBPM engine to execute processes in simulation mode, meaning it does not run the process directly (like invoking services, triggering events, relying on process variables) but instead it relies on input data to calculate how the execution could look like. To run the simulation based on this component drools simulator is utilized with its fluent api. Simulation engine extension provides commands that are added to the simulator on each step of execution. Let's have a quick look at the drools simulator fluent api:
SimulationFluent f = new DefaultSimulationFluent();
// @formatter:off
f.newKnowledgeBuilder()
.add( ResourceFactory.newClassPathResource("BPMN2-ExclusiveSplit.bpmn2"), ResourceType.BPMN2 )
.end(World.ROOT, KnowledgeBuilder.class.getName() )
.newKnowledgeBase()
.addKnowledgePackages()
.end(World.ROOT, KnowledgeBase.class.getName() )
.newPath("path1")
.newStep( 0 )
.newStatefulKnowledgeSession()
.end(World.ROOT, StatefulKnowledgeSession.class.getName())
.runSimulation();
// @formatter:on
So what it does? It's sort of recording what it should do (and when) after simulation is triggered with runSimulation method. So in this example following will happen:
* create knowledge builder and add a process into it
* create knowledge base with the builder
* create a path with unique identifier
* create a step at the time distance 0 meaning will be executed directly (in case delays are executed it will advance clock with the specified amount of time)
* create stateful knowledge session as part of the step
* and finally run the simulation
And this is pure drools simulator, let's take a look at the simulation engine extension component and what it consists of and finally how it can e used with drools simulator.
https://community.jboss.org/servlet/JiveServlet/showImage/19168/simulatio... https://community.jboss.org/servlet/JiveServlet/downloadImage/19168/simul...
As you can see there are quite few classes involved so let me explain each of their responsibility
SimulationDataProvider - this one is responsible for providing information (like simulation properties) for a given node
BPMN2SimulationDataProvider - fetches simulation properties directly from BPMN2 file that are stored as extension elements of each node or sequence flow as meta data
JBPMBAMSimulationDataprovider - fetches information about given node from jBPM Business Activity Monitoring module and attempts to convert them to simulation properties (still under development meaning not yet fully functional)
TimeGenerator - provides simple way to manipulate time based properties to add some sort of randomness while running simulation, for instance when duration of an activity is given as 3 (+-1) minutes then time generator will be returning values for following range 2 - 4 minutes
ActivitySimulator - this is the main component of the simulation engine extension as it will be triggered for every node in the process and based on it type various operations will be invoked
StartEventSimulator - records the start time
EndEventSimulator - records end time and calculates simulation instance duration (execution time)
StateBasedActivitySimulator - calculates duration (execution time) for a given activity
HumanTaskActivitySimulator - calculates human task related data like wait time if users assigned to handle given task are fully booked, resource utilization, etc
SimulationEvent - each ActivitySimulator produces event that contain all relevant information for a particular node, that means that each simulator will have a dedicated SimulationEvent
SimulationRepository - place holder for all SimulationEvents and depending on the implementation event processor
InMemorySimulationRepository - simple implementation that collects all the events in a list for further processing but does not do anything with the events
WorkingMemorySimulationRepository - implementation that employs WorkingMemory (StatefulSession) as container for events and make use of rules and cep for processing like event aggregation etc
This briefly describes main items of the simulation engine extension but you could notice there is nothing that can actually run the simulation. For that purpose there is a dedicated command SimulateProcessPathCommand that will be used together with drools simulator to run the simulation. This command will make sure that all prerequisites for running the simulation are met and will start the process in the engine.
Currently the weakest part is the result of the simulation, in other words what to do with all the events that were produced during simulation. Personally I think that using rules and CEP can give a lot of power and flexibility to produce various reports and statistics based on the events but I would appreciate your comments in this (and not only this) area.
More will come so stay tuned!
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13 years, 8 months
