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  • Entity must be managed to call remove

    Hi, I am facing a very common problem. I am not able to remove an entity from datatable. My entity class is:

    Code:
    public class ElectricDeviceEntity implements DeviceEntityInterface {
    	
    	@Id
    	private int Id;
    	private String name;
    	@ManyToOne(optional=false,cascade=CascadeType.ALL,targetEntity=ProfileEntity.class)
    	@JoinColumn(name="profile", referencedColumnName="id")
    	private ProfileEntity profileEntity;
    	private int device;
    	@ManyToOne(optional=false,cascade=CascadeType.ALL,targetEntity=PortEntity.class)
    	@JoinColumn(name="port", referencedColumnName="id")
    	private PortEntity portEntity;
        // getters and setters
    }
    My Dao class is:


    Code:
    public class ElectricDeviceDao implements DeviceServiceInterface{
    	
    	@PersistenceContext
    	protected EntityManager entityManager;
    	private ElectricDeviceEntity deviceEntity;
    	
    	private void InterfaceToEntity(DeviceEntityInterface deviceEntity)
    	{
    		this.deviceEntity = (ElectricDeviceEntity)deviceEntity;
    	}
    	
    public void deleteDevice(DeviceEntityInterface deviceEntityInterface)
    	{
    		InterfaceToEntity(deviceEntityInterface);
    		deviceEntity = entityManager.merge(deviceEntity);
    		entityManager.remove(this.deviceEntity);
    		entityManager.flush();
    	}
    }

    My service class is:

    Code:
    public class ElectricDeviceService implements DeviceServiceInterface{
    	
    	@Autowired
       ElectricDeviceDao deviceDao;
    	
    		public void deleteDevice(DeviceEntityInterface deviceEntityInterface)
    	{
    		deviceDao.deleteDevice(deviceEntityInterface);
    	}
    }
    And my spring-config xml file is:

    Code:
    <?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
               xmlns:aop="http://www.springframework.org/schema/aop"
                xmlns:context="http://www.springframework.org/schema/context" xmlns:jee="http://www.springframework.org/schema/jee"
                xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="
    http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
    http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
    http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.0.xsd
    http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">
    
    <context:component-scan base-package="com.infosys.ingreen.middleware.dao" />
    
    
    <bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" />  
    
    <bean id="entityManagerFactory" 
    class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean"> 
    <property name="persistenceUnitName" value="IngreenMiddleware"/>
     </bean>
     
    <context:annotation-config/>
    
    
    <bean id="transactionManager" 
    class="org.springframework.orm.jpa.JpaTransactionManager">
    <property name="entityManagerFactory" ref="entityManagerFactory"/> 
    </bean>
    
    
    
    <bean id="baseTransactionProxy" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean" abstract="true">
    		<property name="transactionManager" ref="transactionManager"/>
    		<property name="target"><ref bean="DeviceService"/></property>
    		<property name="transactionAttributes">
    			<props>
    				<prop key="add*">PROPAGATION_REQUIRED</prop>
    				<prop key="update*">PROPAGATION_REQUIRED</prop>
    				<prop key="get*">PROPAGATION_REQUIRED</prop>
    				<prop key="deleteDevice*">PROPAGATION_REQUIRED</prop>
    			</props>
    		</property>
    		
    	</bean>
    
    <bean id="DeviceService" class="com.infosys.ingreen.middleware.service.ElectricDeviceService"/>
    
    
    </beans>
    What can be the reason behind this error:

    Entity must be managed to call remove: com.infosys.ingreen.middleware.entity.ElectricDevi ceEntity@908881, try merging the detached and try the remove again.
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