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Posted to users@felix.apache.org by Vlatko Davidovski <vd...@gmail.com> on 2009/10/13 01:00:09 UTC
Strange iPojo problems with DB4O
OHi
I experienced a bigger problem when using iPojo in combination with
db4o.
Simply, I create an DB4O ObjectContainer and try to store an entity
(see attached classes):
container.store(entity);
It throws me the following exception:
2009.10.13 00:51:28 ERROR - Bundle:ch.ethz.inf.vs.aparat.aparat-
registry - [ERROR]
ch
.ethz.inf.vs.aparat.registry.osgi.services.DeviceRegistryServiceImpl :
[ch
.ethz
.inf.vs.aparat.registry.osgi.services.DeviceRegistryServiceImpl-0] The
callback method start has thrown an exception :
ch.ethz.inf.vs.aparat.core.entity.Entity -
java.lang.ClassCastException: ch.ethz.inf.vs.aparat.core.entity.Entity
This does not make much sense to me, as this is a simple code that
runs in a regular POJO or regular OSGi bundles.
Any ideas how to resolve this?
Thanks!
Vlatko
------------------------------------------
public class Entity {
/**
* The name of the entity. This parameter is desired to be unique.
* However, as this cannot be always guaranteed, the parameter
* guaranteeing uniqueness arre the {@link UUID}.
*/
protected String name;
/**
* Represents the list of universally unique IDs an entity is
* associated with. This list of IDs is used as a unique identifier
* by the gateway to differentiate between entities.
*
* One entity (device, publisher, subscriber, etc.) can have mutliple
* UUIDs as different types can be used for identification EPC, MAC
address, etc.
* For more information see {@link DeviceUUID}.
*/
protected List<UUID> uuids;
/**
* Creates a new entity with its name and the list of {@link UUID} it
is
* associated with.
*
* @param name the name of the entity
* @param uuids the UUID to add to its UUIDs list
*/
public Entity(String name, List<UUID> uuids) {
this.name = name;
this.uuids = uuids;
}
/**
* Gets the name of the {@link Entity}
*
* @return the name
*/
public String getName() {
return name;
}
/**
* Sets the name of the {@link Entity}
*
* @param name the name to set
*/
public void setName(String name) {
this.name = name;
}
/**
* Gets the list of {@link UUID} associated with the
* {@link Entity}
*
* @return the uuids
*/
public List<UUID> getUuids() {
return uuids;
}
/**
* Sets the list of {@link UUID} associated with the
* {@link Entity}
*
* @param uuids the uuids to set
*/
public void setUuid(List<UUID> uuids) {
this.uuids = uuids;
}
/**
* Adds a single {@link UUID} to the list of UUIDs associated
* with the {@link Entity}
*
* @param uuid the UUID to add
*/
public void addUuid(UUID uuid) {
if(uuids == null)
uuids = new ArrayList<UUID>();
uuids.add(uuid);
}
}
public class UUID {
/**
* MAC address UUID type.
*/
public static final String UUID_TYPE_MAC_ADDRESS = "mac";
/**
* EPC (Electronic Product Code) address UUID type.
*/
public static final String UUID_TYPE_EPC = "epc";
/**
* Represents the type of the UUID.
*/
protected String type;
/**
* Represents the value of the UUID for a given type.
*/
protected String value;
/**
* Default empty constructor.
*/
public UUID() {
}
/**
* Creates a new UUID for given UUID type and value.
*
* @param type the type of the UUID
* @param value the value of the UUID
*/
public UUID(String type, String value) {
this.type = type;
this.value = value;
}
/**
* Gets the type of the UUID.
*
* @return the type
*/
public String getType() {
return type;
}
/**
* Sets the type of the UUID.
* <b>Important notice:</b> the UUID type is always
* saved in lower case.
*
* @param type the type to set
*/
public void setType(String type) {
this.type = type.toLowerCase();
}
/**
* Gets the value of the UUID.
*
* @return the value
*/
public String getValue() {
return value;
}
/**
* Sets the value of the UUID.
* <b>Important notice:</b> the UUID value is always
* saved in lower case.
*
* @param value the value to set
*/
public void setValue(String value) {
this.value = value.toLowerCase();
}
}
Re: Strange iPojo problems with DB4O [Resolved]
Posted by Vlatko Davidovski <vd...@gmail.com>.
Resolved.
It was a db4o caching issue.
On Oct 13, 2009, at 1:00 AM, Vlatko Davidovski wrote:
> OHi
>
> I experienced a bigger problem when using iPojo in combination with
> db4o.
>
> Simply, I create an DB4O ObjectContainer and try to store an entity
> (see attached classes):
> container.store(entity);
>
> It throws me the following exception:
> 2009.10.13 00:51:28 ERROR - Bundle:ch.ethz.inf.vs.aparat.aparat-
> registry - [ERROR]
> ch
> .ethz
> .inf.vs.aparat.registry.osgi.services.DeviceRegistryServiceImpl :
> [ch
> .ethz
> .inf.vs.aparat.registry.osgi.services.DeviceRegistryServiceImpl-0]
> The callback method start has thrown an exception :
> ch.ethz.inf.vs.aparat.core.entity.Entity -
> java.lang.ClassCastException: ch.ethz.inf.vs.aparat.core.entity.Entity
>
> This does not make much sense to me, as this is a simple code that
> runs in a regular POJO or regular OSGi bundles.
> Any ideas how to resolve this?
>
> Thanks!
> Vlatko
>
> ------------------------------------------
> public class Entity {
>
> /**
> * The name of the entity. This parameter is desired to be unique.
> * However, as this cannot be always guaranteed, the parameter
> * guaranteeing uniqueness arre the {@link UUID}.
> */
> protected String name;
>
> /**
> * Represents the list of universally unique IDs an entity is
> * associated with. This list of IDs is used as a unique identifier
> * by the gateway to differentiate between entities.
> *
> * One entity (device, publisher, subscriber, etc.) can have mutliple
> * UUIDs as different types can be used for identification EPC, MAC
> address, etc.
> * For more information see {@link DeviceUUID}.
> */
> protected List<UUID> uuids;
>
> /**
> * Creates a new entity with its name and the list of {@link UUID}
> it is
> * associated with.
> *
> * @param name the name of the entity
> * @param uuids the UUID to add to its UUIDs list
> */
> public Entity(String name, List<UUID> uuids) {
> this.name = name;
> this.uuids = uuids;
> }
>
> /**
> * Gets the name of the {@link Entity}
> *
> * @return the name
> */
> public String getName() {
> return name;
> }
>
> /**
> * Sets the name of the {@link Entity}
> *
> * @param name the name to set
> */
> public void setName(String name) {
> this.name = name;
> }
>
> /**
> * Gets the list of {@link UUID} associated with the
> * {@link Entity}
> *
> * @return the uuids
> */
> public List<UUID> getUuids() {
> return uuids;
> }
>
> /**
> * Sets the list of {@link UUID} associated with the
> * {@link Entity}
> *
> * @param uuids the uuids to set
> */
> public void setUuid(List<UUID> uuids) {
> this.uuids = uuids;
> }
>
> /**
> * Adds a single {@link UUID} to the list of UUIDs associated
> * with the {@link Entity}
> *
> * @param uuid the UUID to add
> */
> public void addUuid(UUID uuid) {
> if(uuids == null)
> uuids = new ArrayList<UUID>();
>
> uuids.add(uuid);
> }
>
> }
>
>
> public class UUID {
> /**
> * MAC address UUID type.
> */
> public static final String UUID_TYPE_MAC_ADDRESS = "mac";
>
> /**
> * EPC (Electronic Product Code) address UUID type.
> */
> public static final String UUID_TYPE_EPC = "epc";
>
> /**
> * Represents the type of the UUID.
> */
> protected String type;
>
> /**
> * Represents the value of the UUID for a given type.
> */
> protected String value;
>
> /**
> * Default empty constructor.
> */
> public UUID() {
> }
>
> /**
> * Creates a new UUID for given UUID type and value.
> *
> * @param type the type of the UUID
> * @param value the value of the UUID
> */
> public UUID(String type, String value) {
> this.type = type;
> this.value = value;
> }
>
> /**
> * Gets the type of the UUID.
> *
> * @return the type
> */
> public String getType() {
> return type;
> }
>
> /**
> * Sets the type of the UUID.
> * <b>Important notice:</b> the UUID type is always
> * saved in lower case.
> *
> * @param type the type to set
> */
> public void setType(String type) {
> this.type = type.toLowerCase();
> }
>
> /**
> * Gets the value of the UUID.
> *
> * @return the value
> */
> public String getValue() {
> return value;
> }
>
> /**
> * Sets the value of the UUID.
> * <b>Important notice:</b> the UUID value is always
> * saved in lower case.
> *
> * @param value the value to set
> */
> public void setValue(String value) {
> this.value = value.toLowerCase();
> }
> }
>