JBO-25002 makes my instance unstable

Question

Hi Gurus,
I have one application based on BC4J. Everything seems working well. But from some point, it shows the following JBO-25002 error. I have no idea what happened and why this error can happen during working well.
Users cannot login by this error sometimes. Can you give me any idea?
JBO-25002: Definition UserRoleMainView of type Attribute not found
     at oracle.jbo.server.ViewObjectImpl.getAttributeIndexOf(ViewObjectImpl.java:3248)
     at oracle.jbo.server.ViewRowImpl.getAttributeIndexOf(ViewRowImpl.java:1296)
     at oracle.jbo.server.ViewRowImpl.getAttribute(ViewRowImpl.java:684)

Answer 1

I'm guessing that 'UserRoleMainView' is a view link accessor attribute (attribute to get to the other side of the view link). For such an attribute, we have a bug that could cause something like your problem under race condition.
Specifically, if two threads try to load attr definition for UserRoleMainView at the same time, you could get into this situation. This bug appears only for VL accessor attrs.
To get around the problem, you can preload attr definition before many threads start working to get the attr all simultaneously (e.g., boot time).
Use code snippet like the following:
import oracle.jbo.server.ViewDefImpl;
// your-viewdef-name must be fully (package) qualified.
ViewDefImpl viewDef = ViewDefImpl.findDefObject(<your-viewdef-name>);
viewDef.getAttributeDefImpls();
getAttributeDefImpls() will force load these attr defs and you should be able to avoid the race condition.
This bug will be fixed in the next release of BC4J.
Thanks.
Sung