Avneesh Sisodia [https://community.jboss.org/people/avneesh] created the 
discussion

"Error creating bean with name 'taskResourceFactory' defined in class path 
resource [META-INF/spring/applicationContext.xml]"

To view the discussion, visit: https://community.jboss.org/message/761043#761043

--------------------------------------------------------------
Hi,
When I am trying to create Local Task Service for jbpm human task using spring 
framework. It throwing exception. 
I have a java class 
TaskResourceFactory.java

public class TaskResourceFactory implements ApplicationContextAware {
    private static final Logger logger = 
LoggerFactory.getLogger(TaskResourceFactory.class);
    private static ApplicationContext context;
    private static TaskService taskService;
    private static AbstractPlatformTransactionManager transactionManager;
    
    @Override
    public void setApplicationContext(ApplicationContext applicationContext)
            throws BeansException {
        this.context = applicationContext;
    }
    public TaskResourceFactory(TaskService tService, 
AbstractPlatformTransactionManager tManager) {
        TaskResourceFactory.taskService = tService;
        TaskResourceFactory.transactionManager = tManager;
        
    }
    
    
    public static LocalTaskService getTaskClient(TaskService taskService, 
AbstractPlatformTransactionManager transactionManager) {
        initializeSessionFactory(transactionManager);
 
        logger.debug("Creating local task service client, based on 
{}",taskService);
        LocalTaskService returnBean = new LocalTaskService(taskService);
 
        logger.debug("Returning task client: {}", returnBean.toString());
        return returnBean;
    }
 
    public static void 
initializeSessionFactory(AbstractPlatformTransactionManager transactionManager) 
{
        logger.debug("Initializing the session factory");
        TaskSessionSpringFactoryImpl springFactory = 
(TaskSessionSpringFactoryImpl) context.getBean("springTaskSessionFactory");
 
        logger.debug("Setting the transaction manager, based on 
{}",transactionManager);
        TransactionManager taskTx = new 
DroolsSpringTransactionManager(transactionManager);
        springFactory.setTransactionManager(taskTx);
 
        logger.debug("Initializing");
        springFactory.initialize();
    }
    public TaskService getTaskService() {
        return taskService;
    }
    public void setTaskService(TaskService taskService) {
        this.taskService = taskService;
    }
    public AbstractPlatformTransactionManager getTransactionManager() {
        return transactionManager;
    }
    public void setTransactionManager(
            AbstractPlatformTransactionManager transactionManager) {
        this.transactionManager = transactionManager;
    }
 


When *springFactory* object is to be create it throwing exception.
my applicationContext.xml is:

     <bean id="transactionManager" 
class="org.springframework.transaction.jta.JtaTransactionManager">
        <property name="transactionManagerName" 
value="java:jboss/TransactionManager"/>
    </bean>    
    <bean id="dataSource" 
class="org.springframework.jndi.JndiObjectFactoryBean">
        <property name="jndiName" value="java:jboss/datasources/RI"/>
    </bean>    
    <tx:annotation-driven transaction-manager="transactionManager" />
    <bean id="jpaVendorAdapter" 
class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
        <property name="showSql" value="true" />      
        <property name="generateDdl" value="true" />
    </bean> 
    <bean id="entityManagerFactory" 
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <property name="persistenceUnitName" value="jbpm" />
        <property name="dataSource" ref="dataSource" />
        <property name="jpaVendorAdapter" ref="jpaVendorAdapter" />
    </bean>    
    <bean id="jpaTxMgr" 
class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="entityManagerFactory" />
        <property name="nestedTransactionAllowed" value="true"/>
    </bean>    
    <bean id="systemEventListener" 
class="org.drools.SystemEventListenerFactory" 
factory-method="getSystemEventListener" /> 
    <bean id="taskService" class="org.jbpm.task.service.TaskService" >
        <property name="systemEventListener" ref="systemEventListener" />
    </bean>    
    <bean id="htEm" 
class="org.springframework.orm.jpa.support.SharedEntityManagerBean">
           <property name="entityManagerFactory" ref="entityManagerFactory"/>
   </bean>
      <bean id="htTxMgr" 
class="org.drools.container.spring.beans.persistence.HumanTaskSpringTransactionManager">
        <constructor-arg ref="transactionManager" />
    </bean>       
    <bean id="springTaskSessionFactory" 
class="org.jbpm.task.service.persistence.TaskSessionSpringFactoryImpl" 
depends-on="taskService" >
        <property name="transactionManager" ref="htTxMgr" />
        <property name="useJTA" value="true" />
        <property name="taskService" ref="taskService" />
     </bean> 
    <bean id="taskResourceFactory" 
class="com.nijhazer.jbpm.quickstart.TaskResourceFactory" 
factory-method="getTaskClient">     
            <constructor-arg type="org.jbpm.task.service.TaskService" 
ref="taskService" />
           <constructor-arg 
type="org.springframework.transaction.support.AbstractPlatformTransactionManager"
 ref="transactionManager" />
    </bean>


stacktrace is:

13:18:57,120 INFO  [stdout] (MSC service thread 1-1) 
org.springframework.beans.factory.BeanCreationException: 
Error creating bean with name 'taskResourceFactory' defined in class path 
resource [META-INF/spring/applicationContext.xml]: 
Instantiation of bean failed; nested exception is 
org.springframework.beans.factory.BeanDefinitionStoreException: 
Factory method [public static org.jbpm.task.service.local.LocalTaskService 
com.nijhazer.jbpm.quickstart.TaskResourceFactory.getTaskClient
(org.jbpm.task.service.TaskService,org.springframework.transaction.support.AbstractPlatformTransactionManager)]
 
threw exception; nested exception is java.lang.NullPointerException
 
13:18:57,120 INFO  [stdout] (MSC service thread 1-1)     at 
org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:581)
 
13:18:57,120 INFO  [stdout] (MSC service thread 1-1)     at 
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod
(AbstractAutowireCapableBeanFactory.java:1015)
 
13:18:57,120 INFO  [stdout] (MSC service thread 1-1)     at 
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance
(AbstractAutowireCapableBeanFactory.java:911)
 
13:18:57,120 INFO  [stdout] (MSC service thread 1-1)     at 
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:485)
 
13:18:57,120 INFO  [stdout] (MSC service thread 1-1)     at 
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
 
13:18:57,121 INFO  [stdout] (MSC service thread 1-1)     at 
org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:294)
 
13:18:57,121 INFO  [stdout] (MSC service thread 1-1)     at 
org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:225)
 
13:18:57,121 INFO  [stdout] (MSC service thread 1-1)     at 
org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:291)
 
13:18:57,121 INFO  [stdout] (MSC service thread 1-1)     at 
org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
 
13:18:57,121 INFO  [stdout] (MSC service thread 1-1)     at 
org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:585)
 
13:18:57,121 INFO  [stdout] (MSC service thread 1-1)     at 
org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:913)
 
13:18:57,121 INFO  [stdout] (MSC service thread 1-1)     at 
org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:464)
 
13:18:57,121 INFO  [stdout] (MSC service thread 1-1)     at 
org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:385)
 
13:18:57,121 INFO  [stdout] (MSC service thread 1-1)     at 
org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:284)
 
13:18:57,122 INFO  [stdout] (MSC service thread 1-1)     at 
org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:111)
 
13:18:57,122 INFO  [stdout] (MSC service thread 1-1)     at 
org.apache.catalina.core.StandardContext.contextListenerStart(StandardContext.java:3368)
 
13:18:57,122 INFO  [stdout] (MSC service thread 1-1)     at 
org.apache.catalina.core.StandardContext.start(StandardContext.java:3821)
 
13:18:57,122 INFO  [stdout] (MSC service thread 1-1)     at 
org.jboss.as.web.deployment.WebDeploymentService.start(WebDeploymentService.java:70)
 
13:18:57,122 INFO  [stdout] (MSC service thread 1-1)     at 
org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1765)
 
13:18:57,122 INFO  [stdout] (MSC service thread 1-1)     at 
org.jboss.msc.service.ServiceControllerImpl$ClearTCCLTask.run(ServiceControllerImpl.java:2291)
 
13:18:57,122 INFO  [stdout] (MSC service thread 1-1)     at 
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
 
13:18:57,122 INFO  [stdout] (MSC service thread 1-1)     at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
 
13:18:57,122 INFO  [stdout] (MSC service thread 1-1)     at 
java.lang.Thread.run(Thread.java:662)
 
13:18:57,122 INFO  [stdout] (MSC service thread 1-1) Caused by: 
org.springframework.beans.factory.BeanDefinitionStoreException: 
Factory method [public static org.jbpm.task.service.local.LocalTaskService 
com.nijhazer.jbpm.quickstart.TaskResourceFactory.getTaskClient
(org.jbpm.task.service.TaskService,org.springframework.transaction.support.AbstractPlatformTransactionManager)]
 threw exception; nested exception is java.lang.NullPointerException
 
13:18:57,123 INFO  [stdout] (MSC service thread 1-1)     at 
org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:169)
 
13:18:57,123 INFO  [stdout] (MSC service thread 1-1)     at 
org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:570)
 
13:18:57,123 INFO  [stdout] (MSC service thread 1-1)     ... 22 more
 
13:18:57,123 INFO  [stdout] (MSC service thread 1-1) Caused by: 
java.lang.NullPointerException
--------------------------------------------------------------

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