Thank you all for the tips.
Before giving up using derby, I have: 1) checked for older versions. No, there
are none (in
real, I tried a fresh install of Tomcat). I double checked
$JAVA_HOME/jre/lib/ext, and
tryied including install a new version of JDK (I was using 1.5.0_04 and made a
try with
1.5.0_06 - no differences).
I tryied a simple JSP that take a connection from the pool and executed a
simple select
count(*) from some_table and error is the same.
Interesting is that I tryied Ij, and the error didn't occured.
But, Ij is not using pt_BR messages, and I suspect error is related (but then I
give up: I
could not spent more than a couple of hours without sucess searching on the net
- I searched
Google, MSN, Altavista). db.apache.org was unavaliable yesterday, and I could
not search
mailing lists.
So, without web support (even from the list), I could not defend Derby anymore
in the
project, and manager directed all development to a comercial database,
unfortunatelly.
At all, thank you... But don't forget to check what could be wrong - there is a
serious
erro/bugr in there.
Details:
- Tomcat 5.5.9 embedded in NetBeans 5.0 Beta 2
- Tomcat 5.5.7 embedded in NetBeans 4.1
- Connection obtained with 'jdbc:derby:c:/projects/biblio/database' (it's
embedded) - Plain
queries works fine (select * from some_table)
- Aggregate count throw ClassCastException (select count(*) from some_table)
Connection declaration:
<Resource auth="Container" description="Biblio" name="jdbc/Biblio"
type="javax.sql.DataSource" username="" password=""
driverClassName="org.apache.derby.jdbc.EmbeddedDriver"
url="jdbc:derby:c:/projects/biblio/database;" maxActive="10" maxIdle="2"/>
Here is stack trace:
08/12/2005 16:29:24 org.apache.catalina.core.ApplicationDispatcher invoke
SEVERE: Servlet.service() for servlet jsp threw exception
ERROR 38000: A exceção 'java.lang.ClassCastException:
org.apache.derby.impl.sql.execute.CountAggregator' foi emitida ao avaliar uma
expressão.
at org.apache.derby.iapi.error.StandardException.newException(Unknown
Source)
at
org.apache.derby.iapi.error.StandardException.unexpectedUserException(Unknown
Source)
at
org.apache.derby.impl.sql.execute.GenericAggregator.getAggregatorInstance(Unknown
Source)
at
org.apache.derby.impl.sql.execute.GenericAggregator.initialize(Unknown Source)
at
org.apache.derby.impl.sql.execute.ScalarAggregateResultSet.initializeScalarAggregation(Unknown
Source)
at
org.apache.derby.impl.sql.execute.ScalarAggregateResultSet.getNextRowCore(Unknown
Source)
at
org.apache.derby.impl.sql.execute.ProjectRestrictResultSet.getNextRowCore(Unknown
Source)
at
org.apache.derby.impl.sql.execute.BasicNoPutResultSetImpl.getNextRow(Unknown
Source)
at org.apache.derby.impl.jdbc.EmbedResultSet.movePosition(Unknown
Source)
at org.apache.derby.impl.jdbc.EmbedResultSet.next(Unknown Source)
at
org.apache.tomcat.dbcp.dbcp.DelegatingResultSet.next(DelegatingResultSet.java:168)
at org.apache.taglibs.standard.tag.common.sql.ResultImpl.<init>(Unknown
Source)
at
org.apache.taglibs.standard.tag.common.sql.QueryTagSupport.doEndTag(Unknown
Source)
at
org.apache.jsp.Biblio.esquerda_jsp._jspx_meth_sql_query_1(esquerda_jsp.java:1427)
at org.apache.jsp.Biblio.esquerda_jsp._jspService(esquerda_jsp.java:215)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at
org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:362)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
at
org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574)
at
org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499)
at
org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:966)
at org.apache.jsp.Biblio.intro_jsp._jspService(intro_jsp.java:110)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at
org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:362)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
at
org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574)
at
org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499)
at
org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:966)
at org.apache.jsp.Biblio.segura.index_jsp._jspService(index_jsp.java:55)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at
org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:362)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:482)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
at
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Thread.java:595)
08/12/2005 16:29:24 org.apache.catalina.core.ApplicationDispatcher invoke
SEVERE: Servlet.service() for servlet jsp threw exception
ERROR 38000: A exceção 'java.lang.ClassCastException:
org.apache.derby.impl.sql.execute.CountAggregator' foi emitida ao avaliar uma
expressão.
at org.apache.derby.iapi.error.StandardException.newException(Unknown
Source)
at
org.apache.derby.iapi.error.StandardException.unexpectedUserException(Unknown
Source)
at
org.apache.derby.impl.sql.execute.GenericAggregator.getAggregatorInstance(Unknown
Source)
at
org.apache.derby.impl.sql.execute.GenericAggregator.initialize(Unknown Source)
at
org.apache.derby.impl.sql.execute.ScalarAggregateResultSet.initializeScalarAggregation(Unknown
Source)
at
org.apache.derby.impl.sql.execute.ScalarAggregateResultSet.getNextRowCore(Unknown
Source)
at
org.apache.derby.impl.sql.execute.ProjectRestrictResultSet.getNextRowCore(Unknown
Source)
at
org.apache.derby.impl.sql.execute.BasicNoPutResultSetImpl.getNextRow(Unknown
Source)
at org.apache.derby.impl.jdbc.EmbedResultSet.movePosition(Unknown
Source)
at org.apache.derby.impl.jdbc.EmbedResultSet.next(Unknown Source)
at
org.apache.tomcat.dbcp.dbcp.DelegatingResultSet.next(DelegatingResultSet.java:168)
at org.apache.taglibs.standard.tag.common.sql.ResultImpl.<init>(Unknown
Source)
at
org.apache.taglibs.standard.tag.common.sql.QueryTagSupport.doEndTag(Unknown
Source)
at
org.apache.jsp.Biblio.esquerda_jsp._jspx_meth_sql_query_1(esquerda_jsp.java:1427)
at org.apache.jsp.Biblio.esquerda_jsp._jspService(esquerda_jsp.java:215)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at
org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:362)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
at
org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574)
at
org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499)
at
org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:966)
at org.apache.jsp.Biblio.intro_jsp._jspService(intro_jsp.java:110)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at
org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:362)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
at
org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574)
at
org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499)
at
org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:966)
at org.apache.jsp.Biblio.segura.index_jsp._jspService(index_jsp.java:55)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at
org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:362)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:482)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
at
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Thread.java:595)
08/12/2005 16:29:25 org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet jsp threw exception
ERROR 38000: A exceção 'java.lang.ClassCastException:
org.apache.derby.impl.sql.execute.CountAggregator' foi emitida ao avaliar uma
expressão.
at org.apache.derby.iapi.error.StandardException.newException(Unknown
Source)
at
org.apache.derby.iapi.error.StandardException.unexpectedUserException(Unknown
Source)
at
org.apache.derby.impl.sql.execute.GenericAggregator.getAggregatorInstance(Unknown
Source)
at
org.apache.derby.impl.sql.execute.GenericAggregator.initialize(Unknown Source)
at
org.apache.derby.impl.sql.execute.ScalarAggregateResultSet.initializeScalarAggregation(Unknown
Source)
at
org.apache.derby.impl.sql.execute.ScalarAggregateResultSet.getNextRowCore(Unknown
Source)
at
org.apache.derby.impl.sql.execute.ProjectRestrictResultSet.getNextRowCore(Unknown
Source)
at
org.apache.derby.impl.sql.execute.BasicNoPutResultSetImpl.getNextRow(Unknown
Source)
at org.apache.derby.impl.jdbc.EmbedResultSet.movePosition(Unknown
Source)
at org.apache.derby.impl.jdbc.EmbedResultSet.next(Unknown Source)
at
org.apache.tomcat.dbcp.dbcp.DelegatingResultSet.next(DelegatingResultSet.java:168)
at org.apache.taglibs.standard.tag.common.sql.ResultImpl.<init>(Unknown
Source)
at
org.apache.taglibs.standard.tag.common.sql.QueryTagSupport.doEndTag(Unknown
Source)
at
org.apache.jsp.Biblio.esquerda_jsp._jspx_meth_sql_query_1(esquerda_jsp.java:1427)
at org.apache.jsp.Biblio.esquerda_jsp._jspService(esquerda_jsp.java:215)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at
org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:362)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
at
org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574)
at
org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499)
at
org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:966)
at org.apache.jsp.Biblio.intro_jsp._jspService(intro_jsp.java:110)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at
org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:362)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
at
org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574)
at
org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499)
at
org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:966)
at org.apache.jsp.Biblio.segura.index_jsp._jspService(index_jsp.java:55)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at
org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:362)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:482)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
at
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Thread.java:595)
Best regards,
Edson Richter
> Satheesh Bandaram wrote:
>
>>A full exception trace (from derby.log) would help. I have not seen this kind
>>of error for
this usage...
>>Satheesh
>>Jean T. Anderson wrote:
>>>Edson Carlos Ericksson Richter wrote:
>>>>I solved my problem not using derby :(
>>>>Appear the list is more interested in voting logos, than solving critical
>>>>bugs.
>>>Your frustration is understandable -- it must have seemed like Derby was
>>>doing nothing
else today but looking at logos.
>>>I suspect the real reason for silence on the issue you posted was nobody
>>>immediately
recognized the problem given the information provided. The turnaround for a
given problem
often depends on if someone has encountered it or something similar before.
>>>Did you try running the same query in ij? and did it get the same error?
>>>regards,
>>> -jean
>>>>Richter
>>>>Edson Carlos Ericksson Richter escreveu:
>>>>>the error message is:
>>>>>select count(*) from TB_BIBLIO_AUTORIZACAO: Exception
>>>>>"java.lang.ClassCastException:
>>>>>org.apache.derby.impl.sql.execute.CountAggregator' was emited evaluating
>>>>>expression.
>>>>>The table TB_BIBLIO_AUTORIZACAO has 8 records, with 3 columns (one
>>>>>integer, 2 varchar).
There are no null values on contents.
>>>>>I recently upgraded derby to 10.1.2.1 (from 10.1.1). I tried to
>>>>>"downgrade" to 10.1.1,
but gives same error. The app is being developed under Apache Tomcat 5.5.9, and
derby
libraries are under $JAKARTA/commons/lib. Other queries (for authentication, as
example) are working fine.
>>>>>I'll appreciate any help.
> Hi -
> Some time ago I encountered similar inexplicable ClassCastExceptions that
> stemed from
having multiple versions of derby classes loaded. Check to be sure that the
only file
containing Derby classes in your Tomcat system is the derby.jar file in
$JAKARTA/commons/lib (check the webapp WEB_INF/lib directory too). If I recall
correctly
my problem resulted from trying to have two versions of derby available in a
single server
by renaming the jars derby100.jar and derby101.jar. The server loaded classes
from both
jarfiles that 'stepped on each other' resulting in casting and security
violations while
processing internal
> manipulations (like aggregation).
>
> Hope this helps
>
>
