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Posted to user@struts.apache.org by jd...@frii.com on 2001/07/12 03:08:55 UTC
struts tags and thread safety
Hi all,
I'm wondering if the struts tags are thread safe?
I have a view which has two frames, each with a jsp page using the
logic:iterate referencing the same collection. When I request the page
which defines the frames and thus loads both jsp pages at the same time
I get exceptions thrown( see below). When I request the jsp pages
seperately, the pages work properly.
Anyone have thoughts on this?
thanks
john ware
- with nested exception:
[weblogic.utils.NestedRuntimeException: Error writing 'Context hashcode:
'1491028', primaryKey: '284', flags: '', needsRefresh: '
alse', needsFlush: 'true', pinned: 'true', ejbObject hashcode:
'1284123', bean hashcode: '2949298'' to persistent store - with ne
ted exception:
[java.sql.SQLException: ORA-08177: can't serialize access for this
transaction
]]
at
weblogic.jts.internal.CoordinatorImpl.throwRollbackException(CoordinatorImpl.java:737)
at
weblogic.jts.internal.CoordinatorImpl.commit(CoordinatorImpl.java:377)
at weblogic.jts.internal.TxContext.commit(TxContext.java:255)
at
weblogic.ejb.internal.StatefulEJBObject.postInvokeOurTx(StatefulEJBObject.java:315)
at
weblogic.ejb.internal.BaseEJBObject.postInvoke(BaseEJBObject.java:795)
at
com.arraybiopharma.ejb.entity.TimeSliceBeanEOImpl.getRegHours(TimeSliceBeanEOImpl.java:117)
at
com.arraybiopharma.ejb.entity.TimeSliceBeanEOImpl_WLSkel.invoke(TimeSliceBeanEOImpl_WLSkel.java:248)
at
weblogic.rmi.extensions.BasicServerObjectAdapter.invoke(BasicServerObjectAdapter.java:347)
at
weblogic.rmi.extensions.BasicRequestHandler.handleRequest(BasicRequestHandler.java:86)
at
weblogic.rmi.extensions.BasicRequestDispatcher.dispatch(BasicRequestDispatcher.java:82)
at
weblogic.rmi.internal.ServerRequest.sendOneWay(ServerRequest.java:73)
at
weblogic.rmi.internal.ServerRequest.sendReceive(ServerRequest.java:77)
at
com.arraybiopharma.ejb.entity.TimeSliceBeanEOImpl_WLStub.getRegHours(TimeSliceBeanEOImpl_WLStub.java:789)
at java.lang.reflect.Method.invoke(Native Method)
at
org.apache.struts.util.PropertyUtils.getSimpleProperty(PropertyUtils.java:717)
at
org.apache.struts.util.PropertyUtils.getNestedProperty(PropertyUtils.java:426)
at
org.apache.struts.util.PropertyUtils.getProperty(PropertyUtils.java:453)
at
org.apache.struts.util.RequestUtils.lookup(RequestUtils.java:503)
at
org.apache.struts.taglib.html.BaseFieldTag.doStartTag(BaseFieldTag.java:188)
at
jsp_servlet._timedetailhours._jspService(_timedetailhours.java:254)
at weblogic.servlet.jsp.JspBase.service(JspBase.java:27)
at
weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:120)
at
weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImpl.java:915)
at
weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImpl.java:879)
at
weblogic.servlet.internal.ServletContextManager.invokeServlet(ServletContextManager.java:269)
at
weblogic.socket.MuxableSocketHTTP.invokeServlet(MuxableSocketHTTP.java:365)
at
weblogic.socket.MuxableSocketHTTP.execute(MuxableSocketHTTP.java:253)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:129)
Wed Jul 11 18:54:53 MDT 2001:<E> <WebAppServletContext-ats> Root cause
of ServletException
javax.servlet.jsp.JspException: Exception thrown by getter for property
activities[0].timeSlices[10].regHours of bean timeForm
at
org.apache.struts.util.RequestUtils.lookup(RequestUtils.java:513)
at
org.apache.struts.taglib.html.BaseFieldTag.doStartTag(BaseFieldTag.java:188)
at
jsp_servlet._timedetailhours._jspService(_timedetailhours.java:254)
at weblogic.servlet.jsp.JspBase.service(JspBase.java:27)
at
weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:120)
at
weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImpl.java:915)
at
weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImpl.java:879)
at
weblogic.servlet.internal.ServletContextManager.invokeServlet(ServletContextManager.java:269)
at
weblogic.socket.MuxableSocketHTTP.invokeServlet(MuxableSocketHTTP.java:365)
at
weblogic.socket.MuxableSocketHTTP.execute(MuxableSocketHTTP.java:253)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:129)
Re: struts tags and thread safety
Posted by "Craig R. McClanahan" <cr...@apache.org>.
On Wed, 11 Jul 2001 jdware@frii.com wrote:
> Hi all,
> I'm wondering if the struts tags are thread safe?
>
On a propertly implemented container, all custom tags (not just the Struts
ones) are thread safe. The JSP spec requires that a single custom tag
instance be used by only one request at a time.
> I have a view which has two frames, each with a jsp page using the
> logic:iterate referencing the same collection. When I request the page
> which defines the frames and thus loads both jsp pages at the same time
> I get exceptions thrown( see below). When I request the jsp pages
> seperately, the pages work properly.
>
> Anyone have thoughts on this?
>
This sounds more like a problem with EJBs than with custom tags. It is
not legal to access the same EJB instance in more than one thread, so
you'll have to ensure that this does not happen.
> thanks
>
> john ware
Craig McClanahan
> - with nested exception:
> [weblogic.utils.NestedRuntimeException: Error writing 'Context hashcode:
> '1491028', primaryKey: '284', flags: '', needsRefresh: '
> alse', needsFlush: 'true', pinned: 'true', ejbObject hashcode:
> '1284123', bean hashcode: '2949298'' to persistent store - with ne
> ted exception:
> [java.sql.SQLException: ORA-08177: can't serialize access for this
> transaction
> ]]
> at
> weblogic.jts.internal.CoordinatorImpl.throwRollbackException(CoordinatorImpl.java:737)
>
> at
> weblogic.jts.internal.CoordinatorImpl.commit(CoordinatorImpl.java:377)
> at weblogic.jts.internal.TxContext.commit(TxContext.java:255)
> at
> weblogic.ejb.internal.StatefulEJBObject.postInvokeOurTx(StatefulEJBObject.java:315)
>
> at
> weblogic.ejb.internal.BaseEJBObject.postInvoke(BaseEJBObject.java:795)
> at
> com.arraybiopharma.ejb.entity.TimeSliceBeanEOImpl.getRegHours(TimeSliceBeanEOImpl.java:117)
>
> at
> com.arraybiopharma.ejb.entity.TimeSliceBeanEOImpl_WLSkel.invoke(TimeSliceBeanEOImpl_WLSkel.java:248)
>
> at
> weblogic.rmi.extensions.BasicServerObjectAdapter.invoke(BasicServerObjectAdapter.java:347)
>
> at
> weblogic.rmi.extensions.BasicRequestHandler.handleRequest(BasicRequestHandler.java:86)
>
> at
> weblogic.rmi.extensions.BasicRequestDispatcher.dispatch(BasicRequestDispatcher.java:82)
>
> at
> weblogic.rmi.internal.ServerRequest.sendOneWay(ServerRequest.java:73)
> at
> weblogic.rmi.internal.ServerRequest.sendReceive(ServerRequest.java:77)
> at
> com.arraybiopharma.ejb.entity.TimeSliceBeanEOImpl_WLStub.getRegHours(TimeSliceBeanEOImpl_WLStub.java:789)
>
> at java.lang.reflect.Method.invoke(Native Method)
> at
> org.apache.struts.util.PropertyUtils.getSimpleProperty(PropertyUtils.java:717)
>
> at
> org.apache.struts.util.PropertyUtils.getNestedProperty(PropertyUtils.java:426)
>
> at
> org.apache.struts.util.PropertyUtils.getProperty(PropertyUtils.java:453)
>
> at
> org.apache.struts.util.RequestUtils.lookup(RequestUtils.java:503)
> at
> org.apache.struts.taglib.html.BaseFieldTag.doStartTag(BaseFieldTag.java:188)
>
> at
> jsp_servlet._timedetailhours._jspService(_timedetailhours.java:254)
> at weblogic.servlet.jsp.JspBase.service(JspBase.java:27)
> at
> weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:120)
>
> at
> weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImpl.java:915)
>
> at
> weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImpl.java:879)
>
> at
> weblogic.servlet.internal.ServletContextManager.invokeServlet(ServletContextManager.java:269)
>
> at
> weblogic.socket.MuxableSocketHTTP.invokeServlet(MuxableSocketHTTP.java:365)
>
> at
> weblogic.socket.MuxableSocketHTTP.execute(MuxableSocketHTTP.java:253)
> at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:129)
>
> Wed Jul 11 18:54:53 MDT 2001:<E> <WebAppServletContext-ats> Root cause
> of ServletException
> javax.servlet.jsp.JspException: Exception thrown by getter for property
> activities[0].timeSlices[10].regHours of bean timeForm
> at
> org.apache.struts.util.RequestUtils.lookup(RequestUtils.java:513)
> at
> org.apache.struts.taglib.html.BaseFieldTag.doStartTag(BaseFieldTag.java:188)
>
> at
> jsp_servlet._timedetailhours._jspService(_timedetailhours.java:254)
> at weblogic.servlet.jsp.JspBase.service(JspBase.java:27)
> at
> weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:120)
>
> at
> weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImpl.java:915)
>
> at
> weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImpl.java:879)
>
> at
> weblogic.servlet.internal.ServletContextManager.invokeServlet(ServletContextManager.java:269)
>
> at
> weblogic.socket.MuxableSocketHTTP.invokeServlet(MuxableSocketHTTP.java:365)
>
> at
> weblogic.socket.MuxableSocketHTTP.execute(MuxableSocketHTTP.java:253)
> at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:129)
>
>