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:

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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
}

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My Dao class is:

Code:

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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();
        }
}

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My service class is:

Code:

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public class ElectricDeviceService implements DeviceServiceInterface{
       
        @Autowired
  ElectricDeviceDao deviceDao;
       
                public void deleteDevice(DeviceEntityInterface deviceEntityInterface)
        {
                deviceDao.deleteDevice(deviceEntityInterface);
        }
}

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And my spring-config xml file is:

Code:

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<?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>

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What can be the reason behind this error:

Quote:

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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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