Hi All,
I'm using: Tomcat 6.0.18; Mysql 5.0.51a; Java 1.5; Hibernate 3.2; (no
spring)
MyApp utilizes five (5) distinct mysql catalogs (databases).
Originally all 5 were accessed using JDBC/JNDI with Resources that all
look like this
(in webapps/MyApp/META-INF):
<Resource name="jdbc/CATALOGNAME" auth="Container"
type="javax.sql.DataSource"
maxActive="100" maxIdle="30" maxWait="10000"
username="XXXXX" password="XXXXX"
driverClassName="com.mysql.jdbc.Driver"
url="jdbc:mysql://localhost:3306/CATALOGNAME"
validationQuery="select 1"
/>
Everything worked fine, including the validationQuery to deal with
MySQL closing connections overnight.
Recently I replaced the JDBC access for 3 of the catalogs by use of
JPA/Hibernate persistence,
while leaving the other two catalogs as originally implemented (they
consist of large tables
containing daily price information; hence not very object-oriented.)
The persistence.xml looks
like this:
<persistence-unit name="ctdbPU" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
..... lots of class entries like:
<class>com.connectedtrading.database.users.AbstractLineitem</class>
<class>com.connectedtrading.database.users.Lineitem</class>
<properties>
<property name="hibernate.connection.driver_class"
value="com.mysql.jdbc.Driver" />
<property name="hibernate.connection.url" value="jdbc:mysql://
localhost:3306/CATALOGNAME" />
<property name="hibernate.connection.username" value="XXXXX" />
<property name="hibernate.connection.password" value="XXXXX" />
</properties>
</persistence-unit>
[Interestingly enough, only one of the 3 CATALOGNAMEs appears.]
Note that I left all 5 of the Resource elements in place in context.xml.
Once again, everything works well, EXCEPT that now when I leave the
system running overnight and
no accesses occur (it's only in dev mode), in the morning I now get
the exception shown at the
end of this email. It certainly looks like the "mysql" disconnect
behavior.
As with the JDBC case, repeating the access causes everything to start
working correctly.
The query being submitted is
org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:75)
com
.connectedtrading.database.users.UserDAO.findByProperty(UserDAO.java:
180)
com.connectedtrading.database.users.UserDAO.findByLogin(UserDAO.java:
203)
which is a hibernate query supporting user login.
If anyone on the list has had experience with this issue under JPA/
Hibernate persistence,
I hope you can give me some pointers to dealing with it.
Thanks much in advance,
Ken Bowen
----- The Exception-----
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented
it from fulfilling this request.
exception
javax.servlet.ServletException:
javax.persistence.PersistenceException:
org.hibernate.exception.JDBCConnectionException: could not execute query
org
.apache
.struts.action.RequestProcessor.processException(RequestProcessor.java:
523)
org
.apache
.struts
.action.RequestProcessor.processActionPerform(RequestProcessor.java:421)
org
.apache.struts.action.RequestProcessor.process(RequestProcessor.java:
224)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
root cause
javax.persistence.PersistenceException:
org.hibernate.exception.JDBCConnectionException: could not execute query
org
.hibernate
.ejb
.AbstractEntityManagerImpl
.throwPersistenceException(AbstractEntityManagerImpl.java:630)
org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:75)
com
.connectedtrading.database.users.UserDAO.findByProperty(UserDAO.java:
180)
com.connectedtrading.database.users.UserDAO.findByLogin(UserDAO.java:
203)
com
.connectedtrading
.user_manage.LoginProcessor.locateUser(LoginProcessor.java:54)
com
.connectedtrading
.user_manage.LoginProcessor.checkLogin(LoginProcessor.java:35)
com
.connectedtrading
.actions.ProcessLoginAction.execute(ProcessLoginAction.java:33)
org
.apache
.struts
.action.RequestProcessor.processActionPerform(RequestProcessor.java:419)
org
.apache.struts.action.RequestProcessor.process(RequestProcessor.java:
224)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
root cause
org.hibernate.exception.JDBCConnectionException: could not execute query
org
.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:
74)
org
.hibernate
.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
org.hibernate.loader.Loader.doList(Loader.java:2216)
org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2104)
org.hibernate.loader.Loader.list(Loader.java:2099)
org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:378)
org
.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:
338)
org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:
172)
org.hibernate.impl.SessionImpl.list(SessionImpl.java:1121)
org.hibernate.impl.QueryImpl.list(QueryImpl.java:79)
org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:66)
com
.connectedtrading.database.users.UserDAO.findByProperty(UserDAO.java:
180)
com.connectedtrading.database.users.UserDAO.findByLogin(UserDAO.java:
203)
com
.connectedtrading
.user_manage.LoginProcessor.locateUser(LoginProcessor.java:54)
com
.connectedtrading
.user_manage.LoginProcessor.checkLogin(LoginProcessor.java:35)
com
.connectedtrading
.actions.ProcessLoginAction.execute(ProcessLoginAction.java:33)
org
.apache
.struts
.action.RequestProcessor.processActionPerform(RequestProcessor.java:419)
org
.apache.struts.action.RequestProcessor.process(RequestProcessor.java:
224)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
root cause
com.mysql.jdbc.CommunicationsException: Communications link failure
due to underlying exception:
** BEGIN NESTED EXCEPTION **
java.net.SocketException
MESSAGE: Broken pipe
STACKTRACE:
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 com.mysql.jdbc.MysqlIO.send(MysqlIO.java:2739)
at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:2650)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1581)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1695)
at com.mysql.jdbc.Connection.execSQL(Connection.java:3026)
at
com
.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:
1137)
at
com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:
1231)
at
org.hibernate.jdbc.AbstractBatcher.getResultSet(AbstractBatcher.java:
186)
at org.hibernate.loader.Loader.getResultSet(Loader.java:1787)
at org.hibernate.loader.Loader.doQuery(Loader.java:674)
at
org
.hibernate
.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
at org.hibernate.loader.Loader.doList(Loader.java:2213)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2104)
at org.hibernate.loader.Loader.list(Loader.java:2099)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:378)
at
org
.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:
338)
at
org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:
172)
at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1121)
at org.hibernate.impl.QueryImpl.list(QueryImpl.java:79)
at org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:66)
at
com
.connectedtrading.database.users.UserDAO.findByProperty(UserDAO.java:
180)
at
com.connectedtrading.database.users.UserDAO.findByLogin(UserDAO.java:
203)
at
com
.connectedtrading
.user_manage.LoginProcessor.locateUser(LoginProcessor.java:54)
at
com
.connectedtrading
.user_manage.LoginProcessor.checkLogin(LoginProcessor.java:35)
at
com
.connectedtrading
.actions.ProcessLoginAction.execute(ProcessLoginAction.java:33)
at
org
.apache
.struts
.action.RequestProcessor.processActionPerform(RequestProcessor.java:419)
at
org
.apache.struts.action.RequestProcessor.process(RequestProcessor.java:
224)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:
1194)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:
432)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at
org
.apache
.catalina
.core
.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:
290)
at
org
.apache
.catalina
.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at
org
.apache
.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:
233)
at
org
.apache
.catalina.core.StandardContextValve.invoke(StandardContextValve.java:
191)
at
org
.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:
128)
at
org
.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:
102)
at
org
.apache
.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:
286)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:
845)
at org.apache.coyote.http11.Http11Protocol
$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:
447)
at java.lang.Thread.run(Thread.java:595)
** END NESTED EXCEPTION **
Last packet sent to the server was 1 ms ago.
com.mysql.jdbc.MysqlIO.send(MysqlIO.java:2757)
com.mysql.jdbc.MysqlIO.send(MysqlIO.java:2650)
com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1581)
com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1695)
com.mysql.jdbc.Connection.execSQL(Connection.java:3026)
com
.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:
1137)
com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:
1231)
org.hibernate.jdbc.AbstractBatcher.getResultSet(AbstractBatcher.java:
186)
org.hibernate.loader.Loader.getResultSet(Loader.java:1787)
org.hibernate.loader.Loader.doQuery(Loader.java:674)
org
.hibernate
.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
org.hibernate.loader.Loader.doList(Loader.java:2213)
org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2104)
org.hibernate.loader.Loader.list(Loader.java:2099)
org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:378)
org
.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:
338)
org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:
172)
org.hibernate.impl.SessionImpl.list(SessionImpl.java:1121)
org.hibernate.impl.QueryImpl.list(QueryImpl.java:79)
org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:66)
com
.connectedtrading.database.users.UserDAO.findByProperty(UserDAO.java:
180)
com.connectedtrading.database.users.UserDAO.findByLogin(UserDAO.java:
203)
com
.connectedtrading
.user_manage.LoginProcessor.locateUser(LoginProcessor.java:54)
com
.connectedtrading
.user_manage.LoginProcessor.checkLogin(LoginProcessor.java:35)
com
.connectedtrading
.actions.ProcessLoginAction.execute(ProcessLoginAction.java:33)
org
.apache
.struts
.action.RequestProcessor.processActionPerform(RequestProcessor.java:419)
org
.apache.struts.action.RequestProcessor.process(RequestProcessor.java:
224)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
note The full stack trace of the root cause is available in the Apache
Tomcat/6.0.18 logs.
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