When I want to instanciate my project engine, I have an exception. It was working in 4.0 and 4.1 but not in 4.2.
I think it is because a field must be setted in jbpm but I don't which.

Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'processEngine' defined in class path resource [ged/rtma/alice/workflow/core/process/applicationContext-core-process.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public org.jbpm.api.ProcessEngine org.jbpm.pvm.internal.cfg.SpringConfiguration.buildProcessEngine()] threw exception; nested exception is org.jbpm.pvm.internal.wire.WireException: couldn't initialize object 'org.jbpm.pvm.internal.jobexecutor.JobExecutor': couldn't invoke method start: couldn't invoke 'start' with null on org.jbpm.pvm.internal.jobexecutor.JobExecutor@14ba9a2: no command executor available in job executor
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:444)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:903)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:817)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:440)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$1.run(AbstractAutowireCapableBeanFactory.java:409)
at java.security.AccessController.doPrivileged(Native Method)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:380)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:264)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:261)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:185)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:164)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:429)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:728)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:380)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
at ged.rtma.alice.workflow.core.component.DeploymentDemo.main(DeploymentDemo.java:40)
Caused by: org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public org.jbpm.api.ProcessEngine org.jbpm.pvm.internal.cfg.SpringConfiguration.buildProcessEngine()] threw exception; nested exception is org.jbpm.pvm.internal.wire.WireException: couldn't initialize object 'org.jbpm.pvm.internal.jobexecutor.JobExecutor': couldn't invoke method start: couldn't invoke 'start' with null on org.jbpm.pvm.internal.jobexecutor.JobExecutor@14ba9a2: no command executor available in job executor
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:127)
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:435)
... 17 more
Caused by: org.jbpm.pvm.internal.wire.WireException: couldn't initialize object 'org.jbpm.pvm.internal.jobexecutor.JobExecutor': couldn't invoke method start: couldn't invoke 'start' with null on org.jbpm.pvm.internal.jobexecutor.JobExecutor@14ba9a2: no command executor available in job executor
at org.jbpm.pvm.internal.wire.descriptor.ObjectDescriptor.initialize(ObjectDescriptor.java:238)
at org.jbpm.pvm.internal.wire.WireContext.performInitialization(WireContext.java:533)
at org.jbpm.pvm.internal.wire.WireContext.processPendingInitializations(WireContext.java:564)
at org.jbpm.pvm.internal.wire.WireContext.create(WireContext.java:450)
at org.jbpm.pvm.internal.wire.WireContext.create(WireContext.java:437)
at org.jbpm.pvm.internal.wire.WireContext.get(WireContext.java:417)
at org.jbpm.pvm.internal.wire.WireContext.initializeEagerObjects(WireContext.java:283)
at org.jbpm.pvm.internal.wire.WireContext.create(WireContext.java:268)
at org.jbpm.pvm.internal.cfg.ProcessEngineImpl.buildProcessEngine(ProcessEngineImpl.java:157)
at org.jbpm.pvm.internal.cfg.SpringConfiguration.buildProcessEngine(SpringConfiguration.java:81)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:115)
... 18 more
Caused by: org.jbpm.pvm.internal.wire.WireException: couldn't invoke method start: couldn't invoke 'start' with null on org.jbpm.pvm.internal.jobexecutor.JobExecutor@14ba9a2: no command executor available in job executor
at org.jbpm.pvm.internal.wire.operation.InvokeOperation.apply(InvokeOperation.java:43)
at org.jbpm.pvm.internal.wire.descriptor.ObjectDescriptor.initialize(ObjectDescriptor.java:234)
... 32 more
Caused by: org.jbpm.api.JbpmException: couldn't invoke 'start' with null on org.jbpm.pvm.internal.jobexecutor.JobExecutor@14ba9a2: no command executor available in job executor
at org.jbpm.pvm.internal.util.ReflectUtil.invoke(ReflectUtil.java:163)
at org.jbpm.pvm.internal.wire.operation.InvokeOperation.apply(InvokeOperation.java:39)
... 33 more
Caused by: org.jbpm.api.JbpmException: no command executor available in job executor
at org.jbpm.pvm.internal.jobexecutor.JobExecutor.start(JobExecutor.java:78)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.jbpm.pvm.internal.util.ReflectUtil.invoke(ReflectUtil.java:160)
... 34 more

My SpringContext

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">

<bean id="jbpmConfiguration" class="org.jbpm.pvm.internal.cfg.SpringConfiguration">
<constructor-arg value="/ged/rtma/alice/workflow/core/process/jbpm.cfg.xml" />
</bean>

<bean id="processEngine" factory-bean="jbpmConfiguration" factory-method="buildProcessEngine" />
<bean id="repositoryService" factory-bean="processEngine" factory-method="getRepositoryService" />
<bean id="executionService" factory-bean="processEngine" factory-method="getExecutionService" />
<bean id="taskService" factory-bean="processEngine" factory-method="getTaskService" />
<bean id="historyService" factory-bean="processEngine" factory-method="getHistoryService" />
<bean id="managementService" factory-bean="processEngine" factory-method="getManagementService" />

</beans>

My jbpm.cfg.xml

<?xml version="1.0" encoding="UTF-8"?>

<jbpm-configuration >

<import resource="jbpm.jpdl.cfg.xml" />
<import resource="jbpm.identity.cfg.xml" />
<!-import resource="jbpm.jobexecutor.cfg.xml" /->

<process-engine-context>
<repository-service />
<repository-cache />
<execution-service >
<command-service></command-service>
</execution-service>
<history-service />
<management-service />
<identity-service />
<task-service />

<!-- Here we needed to change the transaction interceptor -->
<command-service>
<retry-interceptor />
<environment-interceptor />
<spring-transaction-interceptor />

</command-service>

<!-- Added spring as read-context -->
<script-manager default-expression-language="juel"
default-script-language="juel"
read-contexts="execution, environment, process-engine, spring"
write-context="">
<script-language name="juel"
factory="org.jbpm.pvm.internal.script.JuelScriptEngineFactory" />
</script-manager>

<!-authentication /->

<id-generator />
<types resource="jbpm.variable.types.xml" />

<address-resolver />

<job-executor threads="10" idle="5000" idle-max="10000"/>

</process-engine-context>

<transaction-context>
<repository-session />
<db-session />

<message-session />
<timer-session />
<history-session />
<mail-session>
<mail-server>
<session-properties resource="jbpm.mail.properties" />
</mail-server>
</mail-session>

<!-- Need to set explicitly that we don't want jbpm to create sessions -->
<hibernate-session current="true" />
</transaction-context>
</jbpm-configuration>