topic Re: Static member is set to null by the process engine in Alfresco Archive

Static member is set to null by the process engine

sor1 — Thu, 18 Oct 2012 06:31:30 GMT

Hello,I have a static memberublic final class MySingletonClass{ public static MyClass MyUniqueObject;}‍‍‍‍MyClass is a class extending the interface Com4jObject.I need to use this static object in 2 service tasks of my workflow: the first service task create it and start to use it. The second s

Re: Static member is set to null by the process engine

jbarrez — Thu, 18 Oct 2012 09:34:15 GMT

Can you post the process xml, cause I don't quite follow what you are trying to do.
Also, can you included the code of your service tasks?

Re: Static member is set to null by the process engine

sor1 — Thu, 18 Oct 2012 09:58:57 GMT

public class MyFirstServiceTaskDelegate extends JavaDelegate
{
    public void execute(DelegateExecution execution)
    {
        MyClass connection = new MyClass();
        connection.login("MyUserName");
        MySingletonClass.MyUniqueObject = connection;                                            
    }
}

public class MySecondServiceTaskDelegate extends JavaDelegate
{
    public void execute(DelegateExecution execution)
    {
        MySingletonClass.MyUniqueObject.logOff; // I have a java.lang.NullPointerException because MySingletonClass.MyUniqueObject is null!!
        MySingletonClass.MyUniqueObject.Dispose();
    }
}

The process:

<process id="sid-ecb59ae4-724e-4e3a-913d-4ba70efe620a" name="MyProcess" isExecutable="true">

        <startEvent id="StartEvent" name="Start">
            <documentation id="sid-c4a36fd8-83f9-49ad-ae93-e090c82e6cbd">Comment…
            </documentation>
            <extensionElements>
                <signavio:signavioMetaData metaKey="bgcolor" metaValue="#ffffff"/>
            </extensionElements>
            <outgoing>sid-43298455-F11D-464C-A804-9999D7A63A52</outgoing>
        </startEvent>
        <serviceTask activiti:class="com.persistent.greenlab.workflow.scheduler.ValidCommandComingDelegate" completionQuantity="1" id="ValidAnalysis" implementation="webService" isForCompensation="false" name="Valid analysis is coming" startQuantity="1">
            <extensionElements>
                <signavio:signavioMetaData metaKey="bgcolor" metaValue="#ffffcc"/>
                <signavio:signavioMetaData metaKey="risklevel" metaValue=""/>
                <signavio:signavioMetaData metaKey="externaldocuments" metaValue="[]"/>
            </extensionElements>
            <incoming>sid-43298455-F11D-464C-A804-9999D7A63A52</incoming>
            <outgoing>sid-16330616-A681-4C50-A56E-0D7824FF9C55</outgoing>
        </serviceTask>
        <exclusiveGateway gatewayDirection="Diverging" id="IsValidCommand" name="Valid Command?">
            <extensionElements>
                <signavio:signavioMetaData metaKey="bgcolor" metaValue="#ffffff"/>
            </extensionElements>
            <incoming>sid-16330616-A681-4C50-A56E-0D7824FF9C55</incoming>
            <outgoing>sid-442912D1-02D2-42A2-BDB4-D5ECBC843FFD</outgoing>
            <outgoing>sid-1A88D597-C65D-493F-BDE4-35B36CA3BB34</outgoing>
        </exclusiveGateway>
        <serviceTask activiti:class="com.persistent.greenlab.workflow.scheduler.InstrumentsCheckupDelegate" completionQuantity="1" id="InstrumentsCheckup" implementation="webService" isForCompensation="false" name="Instrument Checkup" startQuantity="1">
            <extensionElements>
                <signavio:signavioMetaData metaKey="bgcolor" metaValue="#ffffcc"/>
                <signavio:signavioMetaData metaKey="risklevel" metaValue=""/>
                <signavio:signavioMetaData metaKey="externaldocuments" metaValue="[]"/>
            </extensionElements>
            <incoming>sid-BAF33379-610C-4603-8BE9-F61BDBDB3D49</incoming>
            <incoming>sid-442912D1-02D2-42A2-BDB4-D5ECBC843FFD</incoming>
            <incoming>sid-FF527D19-F32D-4D49-87C3-F638838885C2</incoming>
            <outgoing>sid-E5F8C44A-9D50-4054-A75A-03675C2A77BB</outgoing>
        </serviceTask>
        <receiveTask completionQuantity="1" id="MonitoringInstrumentStatusChange" implementation="webService" instantiate="false" isForCompensation="false" name="Monitoring Instrument status change (until priority = 1)" startQuantity="1">
            <extensionElements>
                <signavio:signavioMetaData metaKey="bgcolor" metaValue="#ffffcc"/>
                <signavio:signavioMetaData metaKey="risklevel" metaValue=""/>
                <signavio:signavioMetaData metaKey="externaldocuments" metaValue="[]"/>
            </extensionElements>
            <incoming>sid-E405AE84-E015-4AB8-BFEB-502A804D39C9</incoming>
            <outgoing>sid-BAF33379-610C-4603-8BE9-F61BDBDB3D49</outgoing>
        </receiveTask>
        <serviceTask activiti:class="com.persistent.greenlab.workflow.scheduler.UpdateAnalysisStateToScheduledDelegate" completionQuantity="1" id="UpdateAnalysisStateToScheduled" implementation="webService" isForCompensation="false" name="Update analysis state to scheduled" startQuantity="1">
            <extensionElements>
                <signavio:signavioMetaData metaKey="bgcolor" metaValue="#ffffcc"/>
                <signavio:signavioMetaData metaKey="risklevel" metaValue=""/>
                <signavio:signavioMetaData metaKey="externaldocuments" metaValue="[]"/>
            </extensionElements>
            <incoming>sid-0D2E4763-AFE9-46E2-BB78-9CEBB9914F7E</incoming>
            <outgoing>sid-E405AE84-E015-4AB8-BFEB-502A804D39C9</outgoing>
        </serviceTask>
        <exclusiveGateway gatewayDirection="Diverging" id="IsInstrumentInError" name="Instrument&#10;in error in Lab ?">
            <extensionElements>
                <signavio:signavioMetaData metaKey="bgcolor" metaValue="#ffffff"/>
            </extensionElements>
            <incoming>sid-408E46D7-84BE-4D3E-A767-68F89091C695</incoming>
            <outgoing>sid-0D2E4763-AFE9-46E2-BB78-9CEBB9914F7E</outgoing>
            <outgoing>sid-7AF88DEA-00C9-40F8-9725-5DB1925388A1</outgoing>
        </exclusiveGateway>
        <exclusiveGateway gatewayDirection="Diverging" id="IsInstrumentIdlePriorityOrder1" name="Instrument Idle&#10;and&#10;Priority order =1">
            <extensionElements>
                <signavio:signavioMetaData metaKey="bgcolor" metaValue="#ffffff"/>
            </extensionElements>
            <incoming>sid-E5F8C44A-9D50-4054-A75A-03675C2A77BB</incoming>
            <outgoing>sid-C917E421-F0E4-4F6D-A644-1A750404D45E</outgoing>
            <outgoing>sid-408E46D7-84BE-4D3E-A767-68F89091C695</outgoing>
        </exclusiveGateway>
        <serviceTask activiti:class="com.persistent.greenlab.workflow.scheduler.MyFirstServiceTaskDelegate" completionQuantity="1" id="StartAnalysis" implementation="webService" isForCompensation="false" name="MyFirstServiceTask" startQuantity="1">
            <extensionElements>
                <signavio:signavioMetaData metaKey="bgcolor" metaValue="#ffffcc"/>
                <signavio:signavioMetaData metaKey="risklevel" metaValue=""/>
                <signavio:signavioMetaData metaKey="externaldocuments" metaValue="[]"/>
            </extensionElements>
            <incoming>sid-C917E421-F0E4-4F6D-A644-1A750404D45E</incoming>
            <outgoing>sid-D1E44199-7EB7-4A49-B104-6D6A9355838C</outgoing>
        </serviceTask>
        <parallelGateway gatewayDirection="Diverging" id="sid-CDB70F30-11B7-4936-917A-60C48CBB17D7" name="">
            <extensionElements>
                <signavio:signavioMetaData metaKey="bgcolor" metaValue="#ffffff"/>
            </extensionElements>
            <incoming>sid-D1E44199-7EB7-4A49-B104-6D6A9355838C</incoming>
            <outgoing>sid-9A40CAAD-EA28-43D3-B0B6-89129321B64B</outgoing>
            <outgoing>sid-521E196C-F674-443B-8439-A6A4F873507C</outgoing>
        </parallelGateway>
        <serviceTask activiti:class="com.persistent.greenlab.workflow.scheduler.UpdateAnalysisStateToInProgressDelegate" completionQuantity="1" id="UpdateAnalysisStateToInProgress" implementation="webService" isForCompensation="false" name="Update analysis state to in progress" startQuantity="1">
            <extensionElements>
                <signavio:signavioMetaData metaKey="bgcolor" metaValue="#ffffcc"/>
                <signavio:signavioMetaData metaKey="risklevel" metaValue=""/>
                <signavio:signavioMetaData metaKey="externaldocuments" metaValue="[]"/>
            </extensionElements>
            <incoming>sid-9A40CAAD-EA28-43D3-B0B6-89129321B64B</incoming>
            <outgoing>sid-25CA92FA-094F-4789-8932-887E6B7EF165</outgoing>
        </serviceTask>
        <parallelGateway gatewayDirection="Converging" id="sid-3B14D52E-5449-44B9-B344-68EB68793C39" name="">
            <extensionElements>
                <signavio:signavioMetaData metaKey="bgcolor" metaValue="#ffffff"/>
            </extensionElements>
            <incoming>sid-BA416BE3-A5CD-4DA2-8006-90A43264F265</incoming>
            <incoming>sid-25CA92FA-094F-4789-8932-887E6B7EF165</incoming>
            <outgoing>sid-F79DE1A4-EFD9-44EF-87CE-8C662658DCA1</outgoing>
        </parallelGateway>
        <serviceTask activiti:class="com.persistent.greenlab.workflow.scheduler.UpdateInstrumentStatusToRunningDelegate" completionQuantity="1" id="UpdateInstrumentStatusIdlToRunning" implementation="webService" isForCompensation="false" name="Update intrument status from idle to running" startQuantity="1">
            <extensionElements>
                <signavio:signavioMetaData metaKey="bgcolor" metaValue="#ffffcc"/>
                <signavio:signavioMetaData metaKey="risklevel" metaValue=""/>
                <signavio:signavioMetaData metaKey="externaldocuments" metaValue="[]"/>
            </extensionElements>
            <incoming>sid-521E196C-F674-443B-8439-A6A4F873507C</incoming>
            <outgoing>sid-BA416BE3-A5CD-4DA2-8006-90A43264F265</outgoing>
        </serviceTask>
        <serviceTask activiti:async="true" activiti:class="com.persistent.greenlab.workflow.scheduler.MonitoringAnalysisDelegate" completionQuantity="1" id="MonitoringAnalysis" implementation="webService" isForCompensation="false" name="Monitoring Analysis" startQuantity="1">
            <extensionElements>
                <signavio:signavioMetaData metaKey="bgcolor" metaValue="#ffffcc"/>
                <signavio:signavioMetaData metaKey="risklevel" metaValue=""/>
                <signavio:signavioMetaData metaKey="externaldocuments" metaValue="[]"/>
            </extensionElements>
            <incoming>sid-F79DE1A4-EFD9-44EF-87CE-8C662658DCA1</incoming>
            <incoming>sid-C4543058-915D-45C9-A15C-5F27B4AD16E1</incoming>
            <outgoing>sid-E54E2C94-5D7C-485A-96C6-7D9E4228A7CB</outgoing>
        </serviceTask>
        <intermediateCatchEvent id="TimerWaitingEndOfRun" name="Waiting end of run">
            <extensionElements>
                <signavio:signavioMetaData metaKey="bgcolor" metaValue="#ffffff"/>
            </extensionElements>
            <incoming>sid-A4EB997B-29B6-4590-B229-6EB28D010183</incoming>
            <outgoing>sid-C4543058-915D-45C9-A15C-5F27B4AD16E1</outgoing>
            <timerEventDefinition id="sid-6bc87052-3b45-4914-88b1-714fcfa104da">
                <timeDuration id="sid-2953e909-fb2e-4732-a092-a8b7715c1eba" xsi:type="tFormalExpression">${RunTime}</timeDuration>
            </timerEventDefinition>
        </intermediateCatchEvent>
        <exclusiveGateway gatewayDirection="Diverging" id="GateWayRunFinished" name="Run is finished?">
            <extensionElements>
                <signavio:signavioMetaData metaKey="bgcolor" metaValue="#ffffff"/>
            </extensionElements>
            <incoming>sid-E54E2C94-5D7C-485A-96C6-7D9E4228A7CB</incoming>
            <outgoing>sid-A63C7EFD-8B52-45D8-A74C-074528E3CF24</outgoing>
            <outgoing>sid-A4EB997B-29B6-4590-B229-6EB28D010183</outgoing>
        </exclusiveGateway>
        <parallelGateway gatewayDirection="Diverging" id="sid-54E7C57C-4100-4318-9359-C398FC3FCDBD" name="">
            <extensionElements>
                <signavio:signavioMetaData metaKey="bgcolor" metaValue="#ffffff"/>
            </extensionElements>
            <incoming>sid-A63C7EFD-8B52-45D8-A74C-074528E3CF24</incoming>
            <outgoing>sid-DFFBD589-C235-4A9E-AEFD-FEECEDB28D75</outgoing>
            <outgoing>sid-EA0D402C-EB86-481B-BD52-FF8D201E9F37</outgoing>
        </parallelGateway>
        <serviceTask activiti:class="com.persistent.greenlab.workflow.scheduler.MySecondServiceTaskDelegate" completionQuantity="1" id="UpdateInstrumentRunningToIdle" implementation="webService" isForCompensation="false" name="MySecondServiceTask" startQuantity="1">
            <extensionElements>
                <signavio:signavioMetaData metaKey="bgcolor" metaValue="#ffffcc"/>
                <signavio:signavioMetaData metaKey="risklevel" metaValue=""/>
                <signavio:signavioMetaData metaKey="externaldocuments" metaValue="[]"/>
            </extensionElements>
            <incoming>sid-DFFBD589-C235-4A9E-AEFD-FEECEDB28D75</incoming>
            <outgoing>sid-73440689-B306-4AAA-8B5C-E865886AAAC5</outgoing>
        </serviceTask>
        <parallelGateway gatewayDirection="Converging" id="sid-270AAB82-043E-4B33-96F3-E8B09651C221" name="">
            <extensionElements>
                <signavio:signavioMetaData metaKey="bgcolor" metaValue="#ffffff"/>
            </extensionElements>
            <incoming>sid-D7362764-2A68-4E45-843E-0450D6008B3D</incoming>
            <incoming>sid-73440689-B306-4AAA-8B5C-E865886AAAC5</incoming>
            <outgoing>sid-3294B7FF-FCB0-4A3B-8F06-9273A3C8F921</outgoing>
        </parallelGateway>
        <serviceTask activiti:class="com.persistent.greenlab.workflow.scheduler.UpdateAnalysisStateToEndedDelegate" completionQuantity="1" id="UpdateAnalysisStateInProgressToEnded" implementation="webService" isForCompensation="false" name="Update analysis state from in progress to ended" startQuantity="1">
            <extensionElements>
                <signavio:signavioMetaData metaKey="bgcolor" metaValue="#ffffcc"/>
                <signavio:signavioMetaData metaKey="risklevel" metaValue=""/>
                <signavio:signavioMetaData metaKey="externaldocuments" metaValue="[]"/>
            </extensionElements>
            <incoming>sid-EA0D402C-EB86-481B-BD52-FF8D201E9F37</incoming>
            <outgoing>sid-D7362764-2A68-4E45-843E-0450D6008B3D</outgoing>
        </serviceTask>
        <endEvent id="EndEvent" name="End">
            <extensionElements>
                <signavio:signavioMetaData metaKey="bgcolor" metaValue="#ffffff"/>
            </extensionElements>
            <incoming>sid-3294B7FF-FCB0-4A3B-8F06-9273A3C8F921</incoming>
        </endEvent>
        <parallelGateway gatewayDirection="Diverging" id="sid-6C7071D6-CE99-46D9-9D15-9D59E8C47118" name="">
            <extensionElements>
                <signavio:signavioMetaData metaKey="bgcolor" metaValue="#ffffff"/>
            </extensionElements>
            <incoming>sid-7AF88DEA-00C9-40F8-9725-5DB1925388A1</incoming>
            <outgoing>sid-37FCF0E5-45E5-468B-A37F-9B9379C41B58</outgoing>
            <outgoing>sid-826DEFCA-04C2-4781-A783-3FE4CC0BF8A5</outgoing>
        </parallelGateway>
        <serviceTask activiti:class="com.persistent.greenlab.workflow.scheduler.UpdateIntrumentStatusToErrorDelegate" completionQuantity="1" id="UpdateIntrumentStatusToError" implementation="webService" isForCompensation="false" name="Update intrument status to error" startQuantity="1">
            <extensionElements>
                <signavio:signavioMetaData metaKey="bgcolor" metaValue="#ffffcc"/>
                <signavio:signavioMetaData metaKey="risklevel" metaValue=""/>
                <signavio:signavioMetaData metaKey="externaldocuments" metaValue="[]"/>
            </extensionElements>
            <incoming>sid-37FCF0E5-45E5-468B-A37F-9B9379C41B58</incoming>
            <outgoing>sid-BD22C095-E7E8-48B3-A8B8-77D671C40354</outgoing>
        </serviceTask>
        <parallelGateway gatewayDirection="Converging" id="sid-2A87A051-E234-42DC-B153-6FFE5739D8AE" name="">
            <extensionElements>
                <signavio:signavioMetaData metaKey="bgcolor" metaValue="#ffffff"/>
            </extensionElements>
            <incoming>sid-43EA876B-AE52-409A-B142-0349ABC27640</incoming>
            <incoming>sid-BD22C095-E7E8-48B3-A8B8-77D671C40354</incoming>
            <outgoing>sid-55B0D7CE-0A83-4D9C-94C0-6EADBC5F311A</outgoing>
        </parallelGateway>
        <serviceTask activiti:class="com.persistent.greenlab.workflow.scheduler.SendAnEmailDelegate" completionQuantity="1" id="sid-67D25F92-398D-4020-A0CD-BA527395F9B5" implementation="webService" isForCompensation="false" name="Send an e-mail" startQuantity="1">
            <extensionElements>
                <signavio:signavioMetaData metaKey="bgcolor" metaValue="#ffffcc"/>
                <signavio:signavioMetaData metaKey="risklevel" metaValue=""/>
                <signavio:signavioMetaData metaKey="externaldocuments" metaValue="[]"/>
            </extensionElements>
            <incoming>sid-826DEFCA-04C2-4781-A783-3FE4CC0BF8A5</incoming>
            <outgoing>sid-43EA876B-AE52-409A-B142-0349ABC27640</outgoing>
        </serviceTask>
        <exclusiveGateway gatewayDirection="Diverging" id="IsThereAtLeastOneInstrumentOK" name="Is there one predefined &#10;instrument with a&#10;status not In Error?">
            <extensionElements>
                <signavio:signavioMetaData metaKey="bgcolor" metaValue="#ffffff"/>
            </extensionElements>
            <incoming>sid-55B0D7CE-0A83-4D9C-94C0-6EADBC5F311A</incoming>
            <outgoing>sid-3DA1F847-D44C-4972-93B8-2E76F2D0E4F8</outgoing>
            <outgoing>sid-6E601F06-BBF8-4708-8EF0-4FD1D95C8A03</outgoing>
        </exclusiveGateway>
        <serviceTask activiti:class="com.persistent.greenlab.workflow.scheduler.AutomaticInstrumentSelectionAmongListDelegate" completionQuantity="1" id="AutomaticInstrumentSelection" implementation="webService" isForCompensation="false" name="Automatic Instrument selection among the list&#10;(less analyses in queue)&#10;" startQuantity="1">
            <extensionElements>
                <signavio:signavioMetaData metaKey="bgcolor" metaValue="#ffffcc"/>
                <signavio:signavioMetaData metaKey="risklevel" metaValue=""/>
                <signavio:signavioMetaData metaKey="externaldocuments" metaValue="[]"/>
            </extensionElements>
            <incoming>sid-3DA1F847-D44C-4972-93B8-2E76F2D0E4F8</incoming>
            <outgoing>sid-06C49699-C486-4287-8753-6D4631760D1E</outgoing>
        </serviceTask>
        <userTask activiti:assignee="greenlab" completionQuantity="1" id="UserConfirmVial" implementation="webService" isForCompensation="false" name="Vial validation" startQuantity="1">
            <documentation id="sid-11623193-a6f4-4e85-a6b2-a9ce2c49e40c">Primary defined instrument is in error. Instrument used for analysis is: ${ChosenInstrumentName}. Please validate vial position on ${ChosenInstrumentName}.</documentation>
            <extensionElements>
                <signavio:signavioMetaData metaKey="bgcolor" metaValue="#ffffcc"/>
                <signavio:signavioMetaData metaKey="risklevel" metaValue=""/>
                <signavio:signavioMetaData metaKey="externaldocuments" metaValue="[]"/>
                <activiti:formProperty id="InstrumentName" name="Instrument Name" readable="true" required="false" type="string" variable="ChosenInstrumentName" writable="false"/>
                <activiti:formProperty id="VialNumber" name="Vial Number" readable="true" required="false" type="string" variable="VialNumber" writable="true"/>
            </extensionElements>
            <incoming>sid-06C49699-C486-4287-8753-6D4631760D1E</incoming>
            <outgoing>sid-CF3B924A-46FC-40E6-BC4A-285AE0CC9C4C</outgoing>
        </userTask>
        <exclusiveGateway gatewayDirection="Diverging" id="DoesUserContinue" name="">
            <extensionElements>
                <signavio:signavioMetaData metaKey="bgcolor" metaValue="#ffffff"/>
            </extensionElements>
            <incoming>sid-CF3B924A-46FC-40E6-BC4A-285AE0CC9C4C</incoming>
            <outgoing>sid-615FBB43-F773-4701-9C35-5860E7AE10B2</outgoing>
            <outgoing>sid-FA00DF1B-6B7E-42F1-8439-AA2E62EAE606</outgoing>
        </exclusiveGateway>
        <serviceTask activiti:class="com.persistent.greenlab.workflow.scheduler.UpdateAnalysisStateToErrorDelegate" completionQuantity="1" id="UpdateAnalysisStateToError" implementation="webService" isForCompensation="false" name="Update Analysis state to Error and notify user" startQuantity="1">
            <extensionElements>
                <signavio:signavioMetaData metaKey="bgcolor" metaValue="#ffffcc"/>
                <signavio:signavioMetaData metaKey="risklevel" metaValue=""/>
                <signavio:signavioMetaData metaKey="externaldocuments" metaValue="[]"/>
            </extensionElements>
            <incoming>sid-615FBB43-F773-4701-9C35-5860E7AE10B2</incoming>
            <incoming>sid-6E601F06-BBF8-4708-8EF0-4FD1D95C8A03</incoming>
            <outgoing>sid-41894BD6-0CAB-47DB-992F-1882A517AB9F</outgoing>
        </serviceTask>
        <endEvent id="EndEventError" name="End">
            <extensionElements>
                <signavio:signavioMetaData metaKey="bgcolor" metaValue="#ffffff"/>
            </extensionElements>
            <incoming>sid-41894BD6-0CAB-47DB-992F-1882A517AB9F</incoming>
        </endEvent>
        <serviceTask activiti:class="com.persistent.greenlab.workflow.scheduler.UpdateXMLPartOtherInstrumentDelegate" completionQuantity="1" id="UpdateXMLPartOtherInstrument" implementation="webService" isForCompensation="false" name="Update XML (Other instrument)" startQuantity="1">
            <extensionElements>
                <signavio:signavioMetaData metaKey="bgcolor" metaValue="#ffffcc"/>
                <signavio:signavioMetaData metaKey="risklevel" metaValue=""/>
                <signavio:signavioMetaData metaKey="externaldocuments" metaValue="[]"/>
            </extensionElements>
            <incoming>sid-FA00DF1B-6B7E-42F1-8439-AA2E62EAE606</incoming>
            <outgoing>sid-FF527D19-F32D-4D49-87C3-F638838885C2</outgoing>
        </serviceTask>
        <endEvent id="EndEventInvalidCommand" name="End">
            <extensionElements>
                <signavio:signavioMetaData metaKey="bgcolor" metaValue="#ffffff"/>
            </extensionElements>
            <incoming>sid-1A88D597-C65D-493F-BDE4-35B36CA3BB34</incoming>
        </endEvent>
        <sequenceFlow id="sid-3294B7FF-FCB0-4A3B-8F06-9273A3C8F921" isImmediate="true" name="" sourceRef="sid-270AAB82-043E-4B33-96F3-E8B09651C221" targetRef="EndEvent"/>
        <sequenceFlow id="sid-43EA876B-AE52-409A-B142-0349ABC27640" isImmediate="true" name="" sourceRef="sid-67D25F92-398D-4020-A0CD-BA527395F9B5" targetRef="sid-2A87A051-E234-42DC-B153-6FFE5739D8AE"/>
        <sequenceFlow id="sid-D7362764-2A68-4E45-843E-0450D6008B3D" isImmediate="true" name="" sourceRef="UpdateAnalysisStateInProgressToEnded" targetRef="sid-270AAB82-043E-4B33-96F3-E8B09651C221"/>
        <sequenceFlow id="sid-D1E44199-7EB7-4A49-B104-6D6A9355838C" isImmediate="true" name="" sourceRef="StartAnalysis" targetRef="sid-CDB70F30-11B7-4936-917A-60C48CBB17D7"/>
        <sequenceFlow id="sid-0D2E4763-AFE9-46E2-BB78-9CEBB9914F7E" isImmediate="true" name="No" sourceRef="IsInstrumentInError" targetRef="UpdateAnalysisStateToScheduled">
            <conditionExpression id="sid-0dca0b5d-2c34-4199-93ed-da4ccb4c2ef2" xsi:type="tFormalExpression"> ${IsInstrumentInError==false}</conditionExpression>
        </sequenceFlow>
        <sequenceFlow id="sid-9A40CAAD-EA28-43D3-B0B6-89129321B64B" isImmediate="true" name="" sourceRef="sid-CDB70F30-11B7-4936-917A-60C48CBB17D7" targetRef="UpdateAnalysisStateToInProgress"/>
        <sequenceFlow id="sid-615FBB43-F773-4701-9C35-5860E7AE10B2" isImmediate="true" name="No" sourceRef="DoesUserContinue" targetRef="UpdateAnalysisStateToError">
            <conditionExpression id="sid-cb9cfe8e-f4b5-4a51-bc3e-015a064413e0" xsi:type="tFormalExpression"> ${empty VialNumber}</conditionExpression>
        </sequenceFlow>
        <sequenceFlow id="sid-43298455-F11D-464C-A804-9999D7A63A52" isImmediate="true" name="" sourceRef="StartEvent" targetRef="ValidAnalysis"/>
        <sequenceFlow id="sid-41894BD6-0CAB-47DB-992F-1882A517AB9F" isImmediate="true" name="" sourceRef="UpdateAnalysisStateToError" targetRef="EndEventError"/>
        <sequenceFlow id="sid-C917E421-F0E4-4F6D-A644-1A750404D45E" isImmediate="true" name="Yes" sourceRef="IsInstrumentIdlePriorityOrder1" targetRef="StartAnalysisInEZChrom">
            <conditionExpression id="sid-cd925f7c-e81d-42be-983d-040a029e8dad" xsi:type="tFormalExpression"> ${IsInstrumentIdle==true}</conditionExpression>
        </sequenceFlow>
        <sequenceFlow id="sid-408E46D7-84BE-4D3E-A767-68F89091C695" isImmediate="true" name="No" sourceRef="IsInstrumentIdlePriorityOrder1" targetRef="IsInstrumentInError">
            <conditionExpression id="sid-f287908b-bf26-4b03-a876-f91bd4134013" xsi:type="tFormalExpression"> ${IsInstrumentIdle==false}</conditionExpression>
        </sequenceFlow>
        <sequenceFlow id="sid-37FCF0E5-45E5-468B-A37F-9B9379C41B58" isImmediate="true" name="" sourceRef="sid-6C7071D6-CE99-46D9-9D15-9D59E8C47118" targetRef="UpdateIntrumentStatusToError"/>
        <sequenceFlow id="sid-E405AE84-E015-4AB8-BFEB-502A804D39C9" isImmediate="true" name="" sourceRef="UpdateAnalysisStateToScheduled" targetRef="MonitoringInstrumentStatusChange"/>
        <sequenceFlow id="sid-CF3B924A-46FC-40E6-BC4A-285AE0CC9C4C" isImmediate="true" name="" sourceRef="UserConfirmVial" targetRef="DoesUserContinue"/>
        <sequenceFlow id="sid-06C49699-C486-4287-8753-6D4631760D1E" isImmediate="true" name="" sourceRef="AutomaticInstrumentSelection" targetRef="UserConfirmVial"/>
        <sequenceFlow id="sid-BAF33379-610C-4603-8BE9-F61BDBDB3D49" isImmediate="true" name="" sourceRef="MonitoringInstrumentStatusChange" targetRef="InstrumentsCheckup">
            <extensionElements>
                <activiti:executionListener class="com.persistent.greenlab.workflow.scheduler.MonitorInstrumentFinishedExecutionListener"/>
            </extensionElements>
        </sequenceFlow>
        <sequenceFlow id="sid-16330616-A681-4C50-A56E-0D7824FF9C55" isImmediate="true" name="" sourceRef="ValidAnalysis" targetRef="IsValidCommand"/>
        <sequenceFlow id="sid-E5F8C44A-9D50-4054-A75A-03675C2A77BB" isImmediate="true" name="" sourceRef="InstrumentsCheckup" targetRef="IsInstrumentIdlePriorityOrder1"/>
        <sequenceFlow id="sid-442912D1-02D2-42A2-BDB4-D5ECBC843FFD" isImmediate="true" name="Yes" sourceRef="IsValidCommand" targetRef="InstrumentsCheckup">
            <conditionExpression id="sid-d02274f0-894a-41c1-88dc-39f9082a76b7" xsi:type="tFormalExpression"> ${IsValidCommand==true}</conditionExpression>
        </sequenceFlow>
        <sequenceFlow id="sid-55B0D7CE-0A83-4D9C-94C0-6EADBC5F311A" isImmediate="true" name="" sourceRef="sid-2A87A051-E234-42DC-B153-6FFE5739D8AE" targetRef="IsThereAtLeastOneInstrumentOK"/>
        <sequenceFlow id="sid-7AF88DEA-00C9-40F8-9725-5DB1925388A1" isImmediate="true" name="Yes" sourceRef="IsInstrumentInError" targetRef="sid-6C7071D6-CE99-46D9-9D15-9D59E8C47118">
            <conditionExpression id="sid-ac14e665-709d-45cf-bc31-0dc7078dc50b" xsi:type="tFormalExpression"> ${IsInstrumentInError==true}</conditionExpression>
        </sequenceFlow>
        <sequenceFlow id="sid-521E196C-F674-443B-8439-A6A4F873507C" isImmediate="true" name="" sourceRef="sid-CDB70F30-11B7-4936-917A-60C48CBB17D7" targetRef="UpdateInstrumentStatusIdlToRunning"/>
        <sequenceFlow id="sid-DFFBD589-C235-4A9E-AEFD-FEECEDB28D75" isImmediate="true" name="" sourceRef="sid-54E7C57C-4100-4318-9359-C398FC3FCDBD" targetRef="UpdateInstrumentRunningToIdle"/>
        <sequenceFlow id="sid-73440689-B306-4AAA-8B5C-E865886AAAC5" isImmediate="true" name="" sourceRef="UpdateInstrumentRunningToIdle" targetRef="sid-270AAB82-043E-4B33-96F3-E8B09651C221"/>
        <sequenceFlow id="sid-3DA1F847-D44C-4972-93B8-2E76F2D0E4F8" isImmediate="true" name="Yes" sourceRef="IsThereAtLeastOneInstrumentOK" targetRef="AutomaticInstrumentSelection">
            <conditionExpression id="sid-8fdb2d9e-9161-4dae-9dd4-333b24a527b3" xsi:type="tFormalExpression"> ${IsThereAtLeastOneInstrumentOK==true}</conditionExpression>
        </sequenceFlow>
        <sequenceFlow id="sid-826DEFCA-04C2-4781-A783-3FE4CC0BF8A5" isImmediate="true" name="" sourceRef="sid-6C7071D6-CE99-46D9-9D15-9D59E8C47118" targetRef="sid-67D25F92-398D-4020-A0CD-BA527395F9B5"/>
        <sequenceFlow id="sid-EA0D402C-EB86-481B-BD52-FF8D201E9F37" isImmediate="true" name="" sourceRef="sid-54E7C57C-4100-4318-9359-C398FC3FCDBD" targetRef="UpdateAnalysisStateInProgressToEnded"/>
        <sequenceFlow id="sid-1A88D597-C65D-493F-BDE4-35B36CA3BB34" isImmediate="true" name="No" sourceRef="IsValidCommand" targetRef="EndEventInvalidCommand">
            <conditionExpression id="sid-6941bb0b-3c3c-4675-acb6-e7d230e40ea9" xsi:type="tFormalExpression"> ${IsValidCommand==false}</conditionExpression>
        </sequenceFlow>
        <sequenceFlow id="sid-BD22C095-E7E8-48B3-A8B8-77D671C40354" isImmediate="true" name="" sourceRef="UpdateIntrumentStatusToError" targetRef="sid-2A87A051-E234-42DC-B153-6FFE5739D8AE"/>
        <sequenceFlow id="sid-FA00DF1B-6B7E-42F1-8439-AA2E62EAE606" isImmediate="true" name="Yes" sourceRef="DoesUserContinue" targetRef="UpdateXMLPartOtherInstrument">
            <conditionExpression id="sid-7416ab38-9047-4306-85ef-97e64c8b0c40" xsi:type="tFormalExpression"> ${!empty VialNumber}</conditionExpression>
        </sequenceFlow>
        <sequenceFlow id="sid-6E601F06-BBF8-4708-8EF0-4FD1D95C8A03" isImmediate="true" name="No" sourceRef="IsThereAtLeastOneInstrumentOK" targetRef="UpdateAnalysisStateToError">
            <conditionExpression id="sid-c8545b25-dcc0-4aa8-bec0-7894c4906f6f" xsi:type="tFormalExpression"> ${IsThereAtLeastOneInstrumentOK==false}</conditionExpression>
        </sequenceFlow>
        <sequenceFlow id="sid-FF527D19-F32D-4D49-87C3-F638838885C2" isImmediate="true" name="" sourceRef="UpdateXMLPartOtherInstrument" targetRef="InstrumentsCheckup"/>
        <sequenceFlow id="sid-BA416BE3-A5CD-4DA2-8006-90A43264F265" isImmediate="true" name="" sourceRef="UpdateInstrumentStatusIdlToRunning" targetRef="sid-3B14D52E-5449-44B9-B344-68EB68793C39"/>
        <sequenceFlow id="sid-F79DE1A4-EFD9-44EF-87CE-8C662658DCA1" isImmediate="true" name="" sourceRef="sid-3B14D52E-5449-44B9-B344-68EB68793C39" targetRef="MonitoringAnalysis"/>
        <sequenceFlow id="sid-25CA92FA-094F-4789-8932-887E6B7EF165" isImmediate="true" name="" sourceRef="UpdateAnalysisStateToInProgress" targetRef="sid-3B14D52E-5449-44B9-B344-68EB68793C39"/>
        <sequenceFlow id="sid-E54E2C94-5D7C-485A-96C6-7D9E4228A7CB" name="" sourceRef="MonitoringAnalysis" targetRef="GateWayRunFinished"/>            
        <sequenceFlow id="sid-A63C7EFD-8B52-45D8-A74C-074528E3CF24" name="Yes" sourceRef="GateWayRunFinished" targetRef="sid-54E7C57C-4100-4318-9359-C398FC3FCDBD">
  <conditionExpression id="RunIsFinished" xsi:type="tFormalExpression"> ${RunIsFinished==true}</conditionExpression>
        </sequenceFlow>
        <sequenceFlow id="sid-C4543058-915D-45C9-A15C-5F27B4AD16E1" name="" sourceRef="TimerWaitingEndOfRun" targetRef="MonitoringAnalysis"/>
        <sequenceFlow id="sid-A4EB997B-29B6-4590-B229-6EB28D010183" name="No" sourceRef="GateWayRunFinished" targetRef="TimerWaitingEndOfRun">
            <conditionExpression id="RunIsNotFinished" xsi:type="tFormalExpression"> ${RunIsFinished==false}</conditionExpression>
        </sequenceFlow>  
    </process>

Re: Static member is set to null by the process engine

jbarrez — Fri, 19 Oct 2012 05:42:44 GMT

JavaDelegate is an interface, so how could you write something like:

public class MySecondServiceTaskDelegate extends JavaDelegate

Did you mean implements there?

Secondly, when both service tasks run in the same jvm, the static value shouldn't be null …

Re: Static member is set to null by the process engine

sor1 — Fri, 19 Oct 2012 06:12:08 GMT

Sorry, yes, I mean implements.

I do not know if both service tasks run in the same jvm:
My process is executed by an external jar that is reponsible to start the process. The 2 delegate are defined in a same jar file.
The first task is synchrone, and the second task is asynchrone. If the second task is asynchrone, does that mean it is done in another jvm?

My tests seems to show that the same JVM is running for all the process: in the process list of the windows task manager, I can see one single java.exe corresponding to the jar responsible of starting the processes.
I can see that my problem (static variable set to null) happens after going throw an intermediateCatchEvent (timer), maybe this can help to understand the problem.

Re: Static member is set to null by the process engine

frederikherema1 — Fri, 19 Oct 2012 12:31:05 GMT

How does your singleton-code look?

Re: Static member is set to null by the process engine

sor1 — Fri, 19 Oct 2012 16:28:35 GMT

Thanks for spending time on this problem.
See at the beginning of this topic, this is explained: this is very simple (static class and static member). I cannot use the singleton pattern (with a getInstance() method that would re-create my object if it is null) because I really need to re-use my object (created in the first service task) in the second service task.

Re: Static member is set to null by the process engine

jbarrez — Mon, 22 Oct 2012 09:00:23 GMT

Then I got no clue what goes wrong … could you create a simple unit test demonstrating the problem, with a minimal bpmn 2.0 xml?

Re: Static member is set to null by the process engine

sor1 — Mon, 22 Oct 2012 09:13:20 GMT

OK, I have to send a simple prototype. I am starting immediatly but it will take sometimes. Thanks.

Re: Static member is set to null by the process engine

sor1 — Thu, 25 Oct 2012 06:51:19 GMT

To reproduce the problem:
1)Have a simple process with a timer set to PT30S between the 2 service tasks: Start–>FirstTask–>Timer–>SecondTask–> End.
2)And the static member manipulation explained above.
3)Have a jar file responsible of starting the process: so it does this kind of code: activitiRuntimeService.startProcessInstanceByKey("MySimpleProcess");
4)Activiti Explorer is deployed on tomcat and the tomcat service is started.

Result:
In the second task, you have a java.lang.NullPointerException because the static object is null.
If now I stop the tomcat server, I do not have the exception and the process ends successfully.

My interpretation is that Activiti Explorer takes the responsibility to continue the process after the timer (according to the Activiti database content). So in its JVM, of course the static member was not initialized.
If an expert could confirm this interpretation I would appreciate.

Thanks.

Re: Static member is set to null by the process engine

frederikherema1 — Thu, 25 Oct 2012 08:32:16 GMT

That is correct. If the (timer) job is executed on activiti explorer, instead of in "your" app"s JVM. This explains why the static variable is null.

To overcome this, either use another -more robust mechanism- to share state (DB) or make sure your app runs in the same tomcat/JVM.

Re: Static member is set to null by the process engine

jbarrez — Thu, 25 Oct 2012 08:35:27 GMT

Yes of course…

If you start the process from a jar and continue it in a webapplication … these are two different JVM's. Which *of course* will mean static values will have different values. JVM's can't sniff those kind of things (not do we want them to). That's pretty much Java 101.

That's also the reason why we invented process variables which are stored in the database…