Hi Peter,
Maybe your example was simplified just to show the error, but I have a
couple of questions on the application logic that was posted...
o Why are you performing a transaction begin/commit when you are only
reading data? If your access is read only with no intent on updates, then a
transaction is overkill.
o Why are you calling flush before the commit? A commit invocation has an
implicit flush action, so there is no reason to call flush explicity (in
this case anyway).
o Is an em.clear() doable for your environment? This would detach all
entities in the EM's persistence context upon invocation.
o The openjpa.AutoDetach property probably pre-dates the JPA spec. Have
you tried running without this property?
Kevin
On Tue, May 12, 2009 at 8:58 AM, Peter Henderson <
peter.hender...@starjar.com> wrote:
> Thanks for replying.
>
>
> The stack trace is within Hessian (server side)
>
>
> StandardWrapperValve[AccountsService]: PWC1406: Servlet.service() for
> servlet AccountsService threw exception
> java.lang.StackOverflowError
> at
> com.caucho.hessian.util.IdentityIntMap.get(IdentityIntMap.java:114)
> at
> com.caucho.hessian.io.Hessian2Output.addRef(Hessian2Output.java:1314)
> at
> com.caucho.hessian.io.JavaSerializer.writeObject(JavaSerializer.java:141)
> at
> com.caucho.hessian.io.Hessian2Output.writeObject(Hessian2Output.java:490)
> at
> com.caucho.hessian.io.JavaSerializer.writeObject(JavaSerializer.java:153)
> at
> com.caucho.hessian.io.Hessian2Output.writeObject(Hessian2Output.java:490)
> at
> com.caucho.hessian.io.JavaSerializer.writeObject(JavaSerializer.java:153)
> at
> com.caucho.hessian.io.Hessian2Output.writeObject(Hessian2Output.java:490)
> .
> .
> .
>
>
> Which seems to suggest it is recursively walking the object graph never
> reaching the end. (and the object graph is very simple [1])
>
> This could be related to dates, although I am not sure atm.
>
>
>
>
> PS
> I am using OpenJPA 1.2.1 on Java 1.6.0_13 on Ubuntu linux 64bit.
>
>
>
>
>
>
>
>
> [1] My entity class
> @Entity
> @Table(name = "accounts")
> @NamedQueries({
> @NamedQuery(name = "Account.findByParentAccountId",
> query = "SELECT a FROM Account a WHERE a.parentAccountId =
> :accountId"),
> @NamedQuery(name = "Account.findRootAccountsByCategoryId",
> query = "SELECT a FROM Account a WHERE a.accountCategoryId =
> :accountCategoryId AND a.parentAccountId is null AND a.deletedOn is null")
>
> })
> @EntityListeners(AccountHelper.class)
> public class Account
> implements Serializable {
>
> @GeneratedValue(strategy = GenerationType.IDENTITY)
> @Id
> @Column(name = "account_id", nullable = false)
> private Integer accountId;
>
> @Column(name = "account_type", nullable = false)
> private int accountType;
>
> @Column(name = "name", nullable = false)
> private String name;
>
> @Column(name = "full_name", nullable = false)
> private String fullName;
>
> @Column(name = "description")
> private String description;
>
> @Column(name = "manager", nullable = false)
> private String manager;
>
> @Column(name = "tree_depth", nullable = false)
> private int treeDepth;
>
> @Column(name = "balance", nullable = false, precision = 20, scale = 6)
> private BigDecimal balance;
>
> @Column(name = "created_on")
> @Temporal(TemporalType.TIMESTAMP)
> private Date createdOn;
>
> @Column(name = "created_by")
> private String createdBy;
>
> @Column(name = "deleted_on")
> @Temporal(TemporalType.TIMESTAMP)
> private Date deletedOn;
>
> @Column(name = "deleted_by")
> private String deletedBy;
>
> @Column(name = "parent_account_id")
> private Integer parentAccountId;
>
> @Column(name = "account_category_id")
> private Integer accountCategoryId;
>
> @Column(name = "nominal_code")
> private String nominalCode;
>
> ** snip getters/setters hashCode equals toString **
> }
>
>
>
> Rick Curtis wrote:
>
>> Peter -
>>
>> What kind of problems are you having? An exception or stack trace would be
>> very helpful.
>>
>> -Rick
>>
>> Peter Henderson wrote:
>>
>>> ...
>>>
>>> If I don't manually call em.detach() I get lots of problems when hessian
>>> tries to serialize the object for wire transfer.
>>>
>>> ...
>>>
>>>
>>
>
> --
> Peter Henderson
> Director Starjar Limited.
>
> Mobile: +44 (0) 778 233 8645
> Email: peter.hender...@starjar.com
> Web: www.starjar.com
>
>
