Re: Struts2-json-plugin serialization issue with a Hibernate backed JPA entity
I need the root object to be "list" so this isn't going to help.
I'm pretty sure it is not trying to serialize the EJB service, the json
plugin will only try to serialize properties which have getters.
According the debugger there seems to be a public property directly in
the entity called $JAVASSIST_READ_WRITE_HANDLER, I'm quite confident
that is in the attempt to serialize this object the issue occurs.
To be extra sure I set list as the root and the issue still occurs.
On Wed, 2011-09-07 at 07:59 +0200, Maurizio Cucchiara wrote:
> You might take a look at [1], particoularly the section called "root
> object".
> That's because I'm afraid that json plugin is trying to serialize your EJB
> service.
> HTH
>
> [1] struts.apache.org/2.2.3/docs/json-plugin.html
>
> Maurizio Cucchiara
>
> Il giorno 07/set/2011 07.43, "Ken McWilliams" ha
> scritto:
> > I have a JPA entity, which hibernate is proxying.
> >
> > The following action works as it explicitly states the properties to
> > include, however what I would much rather do is use excludeProperties to
> > remove the problematic property. The problem property when serialized
> > causes a "Positioned Update not supported" exception.
> >
> > The interesting thing is, all the properties on the entity class are
> > persisted correctly if explicitly included.
> >
> > Looking in the the debugger shows there is a property called
> > "$JAVASSIST_READ_WRITE_HANDLER" of type FieldInterceptorImpl which
> > Hibernate/JPA adds to the entity. I'm pretty sure this is what is
> > causing it to fail.
> >
> >
> > I've tried the following:
> > @Action(value = "list-clients", results = {
> > @Result(type = "json", params = {
> > "excludeProperties",
> > "list\\[.*\\]\\.\\$JAVASSIST_READ_WRITE_HANDLER.*"
> > })
> > })
> >
> > but with no luck. Following is my action and the entity class.
> >
> >
> >
> > Here is my action (In a _working_ state):
> > /
> > @ParentPackage("json-default")
> > @Result(type = "json")
> > public class ListTable extends ActionSupport {
> >
> > @EJB
> > private ClientService clientService;
> > private List list;
> >
> > @Action(value = "list-clients", results = {
> > @Result(type = "json", params = {
> > "includeProperties",
> > "list\\[.*\\]\\.name, list\\[.*\\]\\.id, list\\[.*\\]\
> > \.timelogCollection\\..*"
> > })
> > })
> > public String listClients() {
> > list = clientService.list();
> > return SUCCESS;
> > }
> >
> > public List getList() {
> > return list;
> > }
> > }
> > /
> >
> > Here is the entity:
> > /
> > @Entity
> > @Table(name = "client")
> > @XmlRootElement
> > @NamedQueries({
> > @NamedQuery(name = "Client.findAll", query = "SELECT c FROM Client
> > c"),
> > @NamedQuery(name = "Client.findById", query = "SELECT c FROM Client
> > c WHERE c.id = :id"),
> > @NamedQuery(name = "Client.findByName", query = "SELECT c FROM
> > Client c WHERE c.name = :name")})
> > public class Client implements Serializable {
> > private static final long serialVersionUID = 1L;
> > @Id
> > @GeneratedValue(strategy = GenerationType.IDENTITY)
> > @Basic(optional = false)
> > @NotNull
> > @Column(name = "id")
> > private Integer id;
> > @Size(max = 45)
> > @Column(name = "name")
> > private String name;
> > @OneToMany(cascade = CascadeType.ALL, mappedBy = "clientId")
> > private Collection timelogCollection;
> >
> > public Client() {
> > }
> >
> > public Client(Integer id) {
> > this.id = id;
> > }
> >
> > public Integer getId() {
> > return id;
> > }
> >
> > public void setId(Integer id) {
> > this.id = id;
> > }
> >
> > public String getName() {
> > return name;
> > }
> >
> > public void setName(String name) {
> > this.name = name;
> > }
> >
> > @XmlTransient
> > public Collection getTimelogCollection() {
> > return timelogCollection;
> > }
> >
> > public void setTimelogCollection(Collection
> > timelogCollection) {
> > this.timelogCollection = timelogCollection;
> > }
> >
> > @Override
> > public int hashCode() {
> > int hash = 0;
> > hash += (id != null ? id.hashCode() : 0);
> > return hash;
> > }
> >
> > @Override
> > public boolean equals(Object object) {
> > // TODO: Warning - this method won't work in the case the id
> > fields are not set
> > if (!(object instanceof Client)) {
> > return false;
> > }
> > Client other = (Client) object;
> > if ((this.id == null && other.id != null) || (this.id != null
> > && !this.id.equals(other.id))) {
> > return false;
> > }
> > return true;
> > }
> >
> > @Override
> > public String toString() {
> > return "com.aerose.kentimekeeper.db.Client[ id=" + id + " ]";
> > }
> >
> > }
> > /
> >
> >
> > -
> > To unsubscribe, e-mail: user-unsubscr...@struts.apache.org
> > For additional commands, e-mail: user-h...@struts.apache.org
> >
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Re: Struts2-json-plugin serialization issue with a Hibernate backed JPA entity
Solved! I've seen a number of posts relating to this issue but none with
solutions...
In searching for how $JAVASSIST_READ_WRITE_HANDLER came into existence
we find:
http://www.docjar.com/html/api/org/hibernate/tool/instrument/javassist/FieldTransformer.java.html
There we can see the getter for "$JAVASSIST_READ_WRITE_HANDLER" is
actually "getFieldHandler" so the exclude parameter becomes:
@Action(value = "list-clients", results = {
@Result(type = "json", params = {
"excludeProperties",
"^list\\[.*\\]\\.fieldHandler\\..*"
})
})
And it all works...
Just tested the shorter ".*\\.fieldHandler\\..*" and it works too, which
is much better because now there is one solution for all such
instrumented entities!
On Tue, 2011-09-06 at 22:20 -0600, Ken McWilliams wrote:
> I have a JPA entity, which hibernate is proxying.
>
> The following action works as it explicitly states the properties to
> include, however what I would much rather do is use excludeProperties to
> remove the problematic property. The problem property when serialized
> causes a "Positioned Update not supported" exception.
>
> The interesting thing is, all the properties on the entity class are
> persisted correctly if explicitly included.
>
> Looking in the the debugger shows there is a property called
> "$JAVASSIST_READ_WRITE_HANDLER" of type FieldInterceptorImpl which
> Hibernate/JPA adds to the entity. I'm pretty sure this is what is
> causing it to fail.
>
>
> I've tried the following:
> @Action(value = "list-clients", results = {
> @Result(type = "json", params = {
> "excludeProperties",
> "list\\[.*\\]\\.\\$JAVASSIST_READ_WRITE_HANDLER.*"
> })
> })
>
> but with no luck. Following is my action and the entity class.
>
>
>
> Here is my action (In a _working_ state):
> /
> @ParentPackage("json-default")
> @Result(type = "json")
> public class ListTable extends ActionSupport {
>
> @EJB
> private ClientService clientService;
> private List list;
>
> @Action(value = "list-clients", results = {
> @Result(type = "json", params = {
> "includeProperties",
> "list\\[.*\\]\\.name, list\\[.*\\]\\.id, list\\[.*\\]\
> \.timelogCollection\\..*"
> })
> })
> public String listClients() {
> list = clientService.list();
> return SUCCESS;
> }
>
> public List getList() {
> return list;
> }
> }
> /
>
> Here is the entity:
> /
> @Entity
> @Table(name = "client")
> @XmlRootElement
> @NamedQueries({
> @NamedQuery(name = "Client.findAll", query = "SELECT c FROM Client
> c"),
> @NamedQuery(name = "Client.findById", query = "SELECT c FROM Client
> c WHERE c.id = :id"),
> @NamedQuery(name = "Client.findByName", query = "SELECT c FROM
> Client c WHERE c.name = :name")})
> public class Client implements Serializable {
> private static final long serialVersionUID = 1L;
> @Id
> @GeneratedValue(strategy = GenerationType.IDENTITY)
> @Basic(optional = false)
> @NotNull
> @Column(name = "id")
> private Integer id;
> @Size(max = 45)
> @Column(name = "name")
> private String name;
> @OneToMany(cascade = CascadeType.ALL, mappedBy = "clientId")
> private Collection timelogCollection;
>
> public Client() {
> }
>
> public Client(Integer id) {
> this.id = id;
> }
>
> public Integer getId() {
> return id;
> }
>
> public void setId(Integer id) {
> this.id = id;
> }
>
> public String getName() {
> return name;
> }
>
> public void setName(String name) {
> this.name = name;
> }
>
> @XmlTransient
> public Collection getTimelogCollection() {
> return timelogCollection;
> }
>
> public void setTimelogCollection(Collection
> timelogCollection) {
> this.timelogCollection = timelogCollection;
> }
>
> @Override
> public int hashCode() {
> int hash = 0;
> hash += (id != null ? id.hashCode() : 0);
> return hash;
> }
>
> @Override
> public boolean equals(Object object) {
> // TODO: Warning - this method won't work in the case the id
> fields are not set
> if (!(object instanceof Client)) {
> return false;
> }
> Client other = (Client) object;
> if ((this.id == null && other.id != null) || (this.id != null
> && !this.id.equals(other.id))) {
> return false;
> }
> return true;
> }
>
> @Override
> public String toString() {
> return "com.aerose.kentimekeeper.db.Client[ id=" + id + " ]";
> }
>
> }
> /
>
>
> -
> To unsubscribe, e-mail: user-unsubscr...@struts.apache.o
Re: Struts2-json-plugin serialization issue with a Hibernate backed JPA entity
You might take a look at [1], particoularly the section called "root
object".
That's because I'm afraid that json plugin is trying to serialize your EJB
service.
HTH
[1] struts.apache.org/2.2.3/docs/json-plugin.html
Maurizio Cucchiara
Il giorno 07/set/2011 07.43, "Ken McWilliams" ha
scritto:
> I have a JPA entity, which hibernate is proxying.
>
> The following action works as it explicitly states the properties to
> include, however what I would much rather do is use excludeProperties to
> remove the problematic property. The problem property when serialized
> causes a "Positioned Update not supported" exception.
>
> The interesting thing is, all the properties on the entity class are
> persisted correctly if explicitly included.
>
> Looking in the the debugger shows there is a property called
> "$JAVASSIST_READ_WRITE_HANDLER" of type FieldInterceptorImpl which
> Hibernate/JPA adds to the entity. I'm pretty sure this is what is
> causing it to fail.
>
>
> I've tried the following:
> @Action(value = "list-clients", results = {
> @Result(type = "json", params = {
> "excludeProperties",
> "list\\[.*\\]\\.\\$JAVASSIST_READ_WRITE_HANDLER.*"
> })
> })
>
> but with no luck. Following is my action and the entity class.
>
>
>
> Here is my action (In a _working_ state):
> /
> @ParentPackage("json-default")
> @Result(type = "json")
> public class ListTable extends ActionSupport {
>
> @EJB
> private ClientService clientService;
> private List list;
>
> @Action(value = "list-clients", results = {
> @Result(type = "json", params = {
> "includeProperties",
> "list\\[.*\\]\\.name, list\\[.*\\]\\.id, list\\[.*\\]\
> \.timelogCollection\\..*"
> })
> })
> public String listClients() {
> list = clientService.list();
> return SUCCESS;
> }
>
> public List getList() {
> return list;
> }
> }
> /
>
> Here is the entity:
> /
> @Entity
> @Table(name = "client")
> @XmlRootElement
> @NamedQueries({
> @NamedQuery(name = "Client.findAll", query = "SELECT c FROM Client
> c"),
> @NamedQuery(name = "Client.findById", query = "SELECT c FROM Client
> c WHERE c.id = :id"),
> @NamedQuery(name = "Client.findByName", query = "SELECT c FROM
> Client c WHERE c.name = :name")})
> public class Client implements Serializable {
> private static final long serialVersionUID = 1L;
> @Id
> @GeneratedValue(strategy = GenerationType.IDENTITY)
> @Basic(optional = false)
> @NotNull
> @Column(name = "id")
> private Integer id;
> @Size(max = 45)
> @Column(name = "name")
> private String name;
> @OneToMany(cascade = CascadeType.ALL, mappedBy = "clientId")
> private Collection timelogCollection;
>
> public Client() {
> }
>
> public Client(Integer id) {
> this.id = id;
> }
>
> public Integer getId() {
> return id;
> }
>
> public void setId(Integer id) {
> this.id = id;
> }
>
> public String getName() {
> return name;
> }
>
> public void setName(String name) {
> this.name = name;
> }
>
> @XmlTransient
> public Collection getTimelogCollection() {
> return timelogCollection;
> }
>
> public void setTimelogCollection(Collection
> timelogCollection) {
> this.timelogCollection = timelogCollection;
> }
>
> @Override
> public int hashCode() {
> int hash = 0;
> hash += (id != null ? id.hashCode() : 0);
> return hash;
> }
>
> @Override
> public boolean equals(Object object) {
> // TODO: Warning - this method won't work in the case the id
> fields are not set
> if (!(object instanceof Client)) {
> return false;
> }
> Client other = (Client) object;
> if ((this.id == null && other.id != null) || (this.id != null
> && !this.id.equals(other.id))) {
> return false;
> }
> return true;
> }
>
> @Override
> public String toString() {
> return "com.aerose.kentimekeeper.db.Client[ id=" + id + " ]";
> }
>
> }
> /
>
>
> -
> To unsubscribe, e-mail: user-unsubscr...@struts.apache.org
> For additional commands, e-mail: user-h...@struts.apache.org
>
Struts2-json-plugin serialization issue with a Hibernate backed JPA entity
I have a JPA entity, which hibernate is proxying.
The following action works as it explicitly states the properties to
include, however what I would much rather do is use excludeProperties to
remove the problematic property. The problem property when serialized
causes a "Positioned Update not supported" exception.
The interesting thing is, all the properties on the entity class are
persisted correctly if explicitly included.
Looking in the the debugger shows there is a property called
"$JAVASSIST_READ_WRITE_HANDLER" of type FieldInterceptorImpl which
Hibernate/JPA adds to the entity. I'm pretty sure this is what is
causing it to fail.
I've tried the following:
@Action(value = "list-clients", results = {
@Result(type = "json", params = {
"excludeProperties",
"list\\[.*\\]\\.\\$JAVASSIST_READ_WRITE_HANDLER.*"
})
})
but with no luck. Following is my action and the entity class.
Here is my action (In a _working_ state):
/
@ParentPackage("json-default")
@Result(type = "json")
public class ListTable extends ActionSupport {
@EJB
private ClientService clientService;
private List list;
@Action(value = "list-clients", results = {
@Result(type = "json", params = {
"includeProperties",
"list\\[.*\\]\\.name, list\\[.*\\]\\.id, list\\[.*\\]\
\.timelogCollection\\..*"
})
})
public String listClients() {
list = clientService.list();
return SUCCESS;
}
public List getList() {
return list;
}
}
/
Here is the entity:
/
@Entity
@Table(name = "client")
@XmlRootElement
@NamedQueries({
@NamedQuery(name = "Client.findAll", query = "SELECT c FROM Client
c"),
@NamedQuery(name = "Client.findById", query = "SELECT c FROM Client
c WHERE c.id = :id"),
@NamedQuery(name = "Client.findByName", query = "SELECT c FROM
Client c WHERE c.name = :name")})
public class Client implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Basic(optional = false)
@NotNull
@Column(name = "id")
private Integer id;
@Size(max = 45)
@Column(name = "name")
private String name;
@OneToMany(cascade = CascadeType.ALL, mappedBy = "clientId")
private Collection timelogCollection;
public Client() {
}
public Client(Integer id) {
this.id = id;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@XmlTransient
public Collection getTimelogCollection() {
return timelogCollection;
}
public void setTimelogCollection(Collection
timelogCollection) {
this.timelogCollection = timelogCollection;
}
@Override
public int hashCode() {
int hash = 0;
hash += (id != null ? id.hashCode() : 0);
return hash;
}
@Override
public boolean equals(Object object) {
// TODO: Warning - this method won't work in the case the id
fields are not set
if (!(object instanceof Client)) {
return false;
}
Client other = (Client) object;
if ((this.id == null && other.id != null) || (this.id != null
&& !this.id.equals(other.id))) {
return false;
}
return true;
}
@Override
public String toString() {
return "com.aerose.kentimekeeper.db.Client[ id=" + id + " ]";
}
}
/
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