connection reset error, followed by broken pipe (pg74.213.jdbc3.jar)

Hi,

I'm having trouble with a tomcat-postgres installation. Server 1 runs
postgresql and tomcat, server 2 has an identical tomcat installation
and application code running (except rebranding). Server 2 has errors
about every week with 'connection reset' in logs/appname.date.log,
futher connection attempts have a 'broken pipe' error. The solution
to get the app running again is to restart tomcat. Both servers have
low load ~50 users per week.

tomcat 5.0.28
postgresql 7.4.8
java jdk 1.5.0_02
jdbc driver pg74.213.jdbc3.jar

Stack trace errors are:

2006-04-13 15:54:03 StandardWrapperValve[AccessPortal]:
Servlet.service() for servlet AccessPortal threw exception
javax.servlet.ServletException: org.postgresql.util.PSQLException: An
I/O error has occured while flushing the output - Exception:
java.net.SocketException: Connection reset
Stack Trace:

java.net.SocketException: Connection reset
at
java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:96)
at java.net.SocketOutputStream.write(SocketOutputStream.java:136)
at
java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:65)
at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:123)
at org.postgresql.core.PGStream.flush(PGStream.java:411)
at
org.postgresql.core.QueryExecutor.sendQueryV3(QueryExecutor.java:337)
at
org.postgresql.core.QueryExecutor.executeV3(QueryExecutor.java:121)
at org.postgresql.core.QueryExecutor.execute(QueryExecutor.java:100)
at org.postgresql.core.QueryExecutor.execute(QueryExecutor.java:43)
at
org.postgresql.jdbc1.AbstractJdbc1Statement.execute(AbstractJdbc1State
ment.java:517)
at
org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2State
ment.java:50)
at
org.postgresql.jdbc1.AbstractJdbc1Statement.executeQuery(AbstractJdbc1
Statement.java:233)
at
org.postgresql.jdbc1.AbstractJdbc1Statement.executeQuery(AbstractJdbc1
Statement.java:221)
at
org.apache.commons.dbcp.DelegatingStatement.executeQuery(DelegatingSta
tement.java:205)
at
com.ourdomain.ourapp.AccessPortal.getUserData(AccessPortal.java:126)
at
com.ourdomain.ourapp.AccessPortal.processRequest(AccessPortal.java:71)
at com.ourdomain.ourapp.AccessPortal.doGet(AccessPortal.java:88)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appli
cationFilterChain.java:237)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFi
lterChain.java:157)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperVa
lve.java:214)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValve
Context.java:104)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java
:520)
at
org.apache.catalina.core.StandardContextValve.invokeInternal(StandardC
ontextValve.java:198)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextVa
lve.java:152)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValve
Context.java:104)
at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(Authenticat
orBase.java:540)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValve
Context.java:102)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java
:520)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.ja
va:137)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValve
Context.java:104)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.ja
va:118)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValve
Context.java:102)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java
:520)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValv
e.java:109)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValve
Context.java:104)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java
:520)
at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
at
org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160
)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:
799)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.proces
sConnection(Http11Protocol.java:705)
at
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:
577)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPo
ol.java:683)
at java.lang.Thread.run(Thread.java:595)
End of Stack Trace

at
com.ourdomain.ourapp.AccessPortal.getUserData(AccessPortal.java:190)
at
com.ourdomain.ourapp.AccessPortal.processRequest(AccessPortal.java:71)
at com.ourdomain.ourapp.AccessPortal.doGet(AccessPortal.java:88)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appli
cationFilterChain.java:237)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFi
lterChain.java:157)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperVa
lve.java:214)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValve
Context.java:104)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java
:520)
at
org.apache.catalina.core.StandardContextValve.invokeInternal(StandardC
ontextValve.java:198)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextVa
lve.java:152)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValve
Context.java:104)
at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(Authenticat
orBase.java:540)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValve
Context.java:102)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java
:520)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.ja
va:137)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValve
Context.java:104)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.ja
va:118)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValve
Context.java:102)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java
:520)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValv
e.java:109)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValve
Context.java:104)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java
:520)
at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
at
org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160
)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:
799)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.proces
sConnection(Http11Protocol.java:705)
at
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:
577)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPo
ol.java:683)
at java.lang.Thread.run(Thread.java:595)

2006-04-13 16:06:51 StandardWrapperValve[AccessPortal]:
Servlet.service() for servlet AccessPortal threw exception
javax.servlet.ServletException: org.postgresql.util.PSQLException: An
I/O error has occured while flushing the output - Exception:
java.net.SocketException: Broken pipe
Stack Trace:

java.net.SocketException: Broken pipe
at java.net.SocketOutputStream.socketWrite0(Native Method)
at
java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92)
at java.net.SocketOutputStream.write(SocketOutputStream.java:136)
at
java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:65)
at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:123)
at org.postgresql.core.PGStream.flush(PGStream.java:411)
at
org.postgresql.core.QueryExecutor.sendQueryV3(QueryExecutor.java:337)
at
org.postgresql.core.QueryExecutor.executeV3(QueryExecutor.java:121)
at org.postgresql.core.QueryExecutor.execute(QueryExecutor.java:100)
at org.postgresql.core.QueryExecutor.execute(QueryExecutor.java:43)
at
org.postgresql.jdbc1.AbstractJdbc1Statement.execute(AbstractJdbc1State
ment.java:517)
at
org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2State
ment.java:50)
at
org.postgresql.jdbc1.AbstractJdbc1Statement.executeQuery(AbstractJdbc1
Statement.java:233)
at
org.postgresql.jdbc1.AbstractJdbc1Statement.executeQuery(AbstractJdbc1
Statement.java:221)
at
org.apache.commons.dbcp.DelegatingStatement.executeQuery(DelegatingSta
tement.java:205)
at
com.ourdomain.ourapp.AccessPortal.getUserData(AccessPortal.java:126)
at
com.ourdomain.ourapp.AccessPortal.processRequest(AccessPortal.java:71)
at com.ourdomain.ourapp.AccessPortal.doGet(AccessPortal.java:88)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appli
cationFilterChain.java:237)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFi
lterChain.java:157)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperVa
lve.java:214)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValve
Context.java:104)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java
:520)
at
org.apache.catalina.core.StandardContextValve.invokeInternal(StandardC
ontextValve.java:198)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextVa
lve.java:152)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValve
Context.java:104)
at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(Authenticat
orBase.java:540)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValve
Context.java:102)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java
:520)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.ja
va:137)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValve
Context.java:104)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.ja
va:118)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValve
Context.java:102)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java
:520)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValv
e.java:109)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValve
Context.java:104)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java
:520)
at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
at
org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160
)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:
799)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.proces
sConnection(Http11Protocol.java:705)
at
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:
577)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPo
ol.java:683)
at java.lang.Thread.run(Thread.java:595)
End of Stack Trace

at
com.ourdomain.ourapp.AccessPortal.getUserData(AccessPortal.java:190)
at
com.ourdomain.ourapp.AccessPortal.processRequest(AccessPortal.java:71)
at com.ourdomain.ourapp.AccessPortal.doGet(AccessPortal.java:88)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appli
cationFilterChain.java:237)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFi
lterChain.java:157)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperVa
lve.java:214)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValve
Context.java:104)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java
:520)
at
org.apache.catalina.core.StandardContextValve.invokeInternal(StandardC
ontextValve.java:198)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextVa
lve.java:152)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValve
Context.java:104)
at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(Authenticat
orBase.java:540)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValve
Context.java:102)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java
:520)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.ja
va:137)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValve
Context.java:104)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.ja
va:118)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValve
Context.java:102)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java
:520)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValv
e.java:109)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValve
Context.java:104)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java
:520)
at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
at
org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160
)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:
799)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.proces
sConnection(Http11Protocol.java:705)
at
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:
577)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPo
ol.java:683)
at java.lang.Thread.run(Thread.java:595)

I haven't been able to find any matches for this problem on the
internet, so I'm posting here hoping someone is aware of the problem.

There is a release pg74.216.jdbc3.jar, I can't find a changelog for
it and builds 213-216, anyone know? It may be that these include a
bug fix. I'm checking pg74.216.jdbc3.jar on a development server, so
will probably try this next.

Thanks,
Ed