I can't insert row because of sequence trigger

I use JDeveloper 3.1.
In table "Category", column "CAT_Id"(PK) has trigger:
BEGIN
select cat_seq.nextval into :new.cat_id from dual ;
END;
I created an entity object based on this table and set the attribute "CatId":Refresh after Insert.
Then I created some view objects,view links,and application module.
Based on this Application Module,I created a JSP Application. But when I try insert a record to the table through the view object.
It always report the error message:
Exception:
java.lang.RuntimeException: JBO-27120: SQL error during query execution. Statement: select cat_id.nextval from dual
void CMSBeanPackage.View1AddEdit.render()
void cmsjsp1_html.CMS_AddEdit_Top._jspService(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
void oracle.jsp.runtime.HttpJsp.service(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
void oracle.jsp.app.JspApplication.dispatchRequest(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
void oracle.jsp.JspServlet.doDispatch(oracle.jsp.app.JspRequestContext)
void oracle.jsp.JspServlet.service(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
void javax.servlet.http.HttpServlet.service(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
void oracle.lite.web.JupServlet.service(oracle.lite.web.JupRequest, oracle.lite.web.JupResponse)
void oracle.lite.web.MimeServletHandler.handle(oracle.lite.web.JupApplication, java.lang.String, int, oracle.lite.web.JupRequest, oracle.lite.web.JupResponse)
void oracle.lite.web.JupApplication.service(oracle.lite.web.JupRequest, oracle.lite.web.JupResponse)
void oracle.lite.web.JupAppHandler.handle(oracle.lite.web.JupRequest, oracle.lite.web.JupResponse)
void oracle.lite.web.HTTPServer.include(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
void oracle.lite.web.HTTPServer.forward(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
boolean oracle.lite.web.HTTPServer.handleRequest(oracle.lite.web.JupInputStream, java.io.OutputStream)
boolean oracle.lite.web.JupServer.handle(oracle.lite.web.JupInputStream, java.io.OutputStream)
void oracle.lite.web.JupHTTPListener$JupHTTP.run()
It will be appreciated if any suggestion.
Regards
Susan

Have you tried doing a nextval followed by a currval? ( see documentation ).
Also...whenever I have a problem like this I go into SQL*Plus and just try the stuff manually/inserting a row to see what happens. I mention this cuz I'm surprised at the number of folks who don't seem to do this, but struggle via an IDE.
Also, make sure that MANDATORY is not set in your Entity Object for the sequence attribute if it is part of the primary key ( since the trigger will take care of it and the BO defaults to mandatory? )
DECLARE
tempval number(10);
BEGIN
select return_activities_seq.NEXTVAL into tempval
from dual;
select return_activities_seq.CURRVAL into tempval
from dual;
:new.Sequence_id := tempval;
END; /* return_activities_insert */

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