Re: OptimisticLockException

[Dain Sundstrom]

This is one of the more confusing parts of the JPA spec.  Although the  
API looks like you should be getting a pessimistic write lock (select  
for update in oracle) when you call that method, you actually only get  
an optimistic lock according to the spec.  In order to get a  
pessimistic lock, you need to turn on the OpenJPA pessimistic lock  
code by adding this flag to the persistence unit:

        openjpa.LockManager=pessimistic
This only works if you are using a database that supports pessimistic  
lock.  The default database in OpenEJB hsqldb doesn't so you'll have  
to use something like Derby, H2, Oracle, mySql or DB2.

-dain

On Mar 17, 2008, at 11:47 PM, the666pack wrote:


Hello,

so i try to test the geronimo 2.0.2 server how it handles concurrent  
delete
requests. i
start quite low with 5 concurrent users trying to delete some values  
from
the database. the problem is that i keep getting the error mentioned  
in the
subject. the more concurrent users i schedule, the more errors i get  
until
about 30 concurrent users the performance levels off quite low. the  
thing i
do in my code is removing a persistent entity:

         // em.lock(director,LockModeType.WRITE); //optimistic lock
exception??????
          em.remove(director);
          //em.flush();                 //because of optimistic lock
exception
          deleted++;

i also tried with the help of the commented out lines, but without a
significant performance increase, here is the error log, maybe  
someone could
help, THANK YOU!

[exec] Caused by: <openjpa-1.0.0-r420667:568756 nonfatal store error>
org.apache.openjpa.persistence.OptimisticLockException: An  
optimistic lock
violation was detected when flushing object instance
"vt.bean.entity.Director-1192302" to the data store.  This indicates  
that
the object was concurrently modified in another transaction.
   [exec] FailedObject: vt.bean.entity.Director-1192302
   [exec]     at
org 
.apache 
.openjpa 
.jdbc 
.kernel 
.PreparedStatementManagerImpl 
.flushInternal(PreparedStatementManagerImpl.java:101)
   [exec]     at
org 
.apache 
.openjpa 
.jdbc 
.kernel 
.PreparedStatementManagerImpl 
.flush(PreparedStatementManagerImpl.java:73)
   [exec]     at
org 
.apache 
.openjpa 
.jdbc 
.kernel 
.OperationOrderUpdateManager 
.flushPrimaryRow(OperationOrderUpdateManager.java:162)
   [exec]     at
org 
.apache 
.openjpa 
.jdbc 
.kernel 
.OperationOrderUpdateManager.flush(OperationOrderUpdateManager.java: 
89)
   [exec]     at
org 
.apache 
.openjpa 
.jdbc.kernel.AbstractUpdateManager.flush(AbstractUpdateManager.java: 
89)
   [exec]     at
org 
.apache 
.openjpa 
.jdbc.kernel.AbstractUpdateManager.flush(AbstractUpdateManager.java: 
72)
   [exec]     at
org 
.apache 
.openjpa.jdbc.kernel.JDBCStoreManager.flush(JDBCStoreManager.java:514)
   [exec]     at
org 
.apache 
.openjpa 
.kernel.DelegatingStoreManager.flush(DelegatingStoreManager.java:130)
   [exec]     ... 42 more
   [exec] NestedThrowables:
   [exec] <openjpa-1.0.0-r420667:568756 nonfatal store error>
org.apache.openjpa.persistence.OptimisticLockException: An  
optimistic lock
violation was detected when flushing object instance
"vt.bean.entity.Director-1192302" to the data store.  This indicates  
that
the object was concurrently modified in another transaction.
   [exec] FailedObject: vt.bean.entity.Director-1192302
   [exec]     at
org 
.apache 
.openjpa 
.jdbc 
.kernel 
.PreparedStatementManagerImpl 
.flushInternal(PreparedStatementManagerImpl.java:101)
   [exec]     at
org 
.apache 
.openjpa 
.jdbc 
.kernel 
.PreparedStatementManagerImpl 
.flush(PreparedStatementManagerImpl.java:73)
   [exec]     at
org 
.apache 
.openjpa 
.jdbc 
.kernel 
.OperationOrderUpdateManager 
.flushPrimaryRow(OperationOrderUpdateManager.java:162)
   [exec]     at
org 
.apache 
.openjpa 
.jdbc 
.kernel 
.OperationOrderUpdateManager.flush(OperationOrderUpdateManager.java: 
89)
   [exec]     at
org 
.apache 
.openjpa 
.jdbc.kernel.AbstractUpdateManager.flush(AbstractUpdateManager.java: 
89)
   [exec]     at
org 
.apache 
.openjpa 
.jdbc.kernel.AbstractUpdateManager.flush(AbstractUpdateManager.java: 
72)
   [exec]     at
org 
.apache 
.openjpa.jdbc.kernel.JDBCStoreManager.flush(JDBCStoreManager.java:514)
   [exec]     at
org 
.apache 
.openjpa 
.kernel.DelegatingStoreManager.flush(DelegatingStoreManager.java:130)
   [exec]     at
org.apache.openjpa.kernel.BrokerImpl.flush(BrokerImpl.java:1946)
   [exec]     at
org.apache.openjpa.kernel.BrokerImpl.flushSafe(BrokerImpl.java:1844)
   [exec]     at
org.apache.openjpa.kernel.BrokerImpl.flush(BrokerImpl.java:1615)
   [exec]     at
org 
.apache.openjpa.kernel.DelegatingBroker.flush(DelegatingBroker.java: 
973)
   [exec]     at
org 
.apache 
.openjpa.persistence.EntityManagerImpl.flush(EntityManagerImpl.java: 
488)
   [exec]     at
vt.bean.stateless.DeleteDataBean.removeDirectors(DeleteDataBean.java: 
115)
   [exec]     at sun.reflect.GeneratedMethodAccessor175.invoke(Unknown
Source)
   [exec]     at
sun 
.reflect 
.DelegatingMethodAccessorImpl 
.invoke(DelegatingMethodAccessorImpl.java:25)
   [exec]     at java.lang.reflect.Method.invoke(Method.java:597)
   [exec]     at
org.apache.openejb.core.interceptor.ReflectionInvocationContext 
$Invocation.invoke(ReflectionInvocationContext.java:146)
   [exec]     at
org 
.apache 
.openejb 
.core 
.interceptor 
.ReflectionInvocationContext 
.proceed(ReflectionInvocationContext.java:129)
   [exec]     at
org 
.apache 
.openejb 
.core.interceptor.InterceptorStack.invoke(InterceptorStack.java:67)
   [exec]     at
org 
.apache 
.openejb 
.core.stateless.StatelessContainer._invoke(StatelessContainer.java: 
203)
   [exec]     at
org 
.apache 
.openejb 
.core.stateless.StatelessContainer.invoke(StatelessContainer.java:165)
   [exec]     at
org 
.apache 
.openejb 
.core 
.ivm.EjbObjectProxyHandler.businessMethod(EjbObjectProxyHandler.java: 
223)
   [exec]     at
org 
.apache 
.openejb 
.core.ivm.EjbObjectProxyHandler._invoke(EjbObjectProxyHandler.java:77)
   [exec]     at
org 
.apache 
.openejb 
.core.ivm.BaseEjbProxyHandler.invoke(BaseEjbProxyHandler.java:245)
   [exec]     at
org 
.apache 
.openejb 
.util 
.proxy.Jdk13InvocationHandler.invoke(Jdk13InvocationHandler.java:49)
   [exec]     at $Proxy23.removeDirectors(Unknown Source)
   [exec]     at
org.apache.jsp.removeTool_jsp._jspService(removeTool_jsp.java:163)
   [exec]     at
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
   [exec]     at
javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
   [exec]     at
org 
.apache 
.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:388)
   [exec]     at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java: 
320)
   [exec]     at
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
   [exec]     at
javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
   [exec]     at
org 
.apache 
.catalina 
.core 
.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java: 
290)
   [exec]     at
org 
.apache 
.catalina 
.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
   [exec]     at
org 
.apache 
.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java: 
230)
   [exec]     at
org 
.apache 
.catalina.core.StandardContextValve.invoke(StandardContextValve.java: 
175)
   [exec]     at
org 
.apache 
.geronimo 
.tomcat.valve.DefaultSubjectValve.invoke(DefaultSubjectValve.java:56)
   [exec]     at
org.apache.geronimo.tomcat.GeronimoStandardContext 
$SystemMethodValve.invoke(GeronimoStandardContext.java:353)
   [exec]     at
org 
.apache 
.geronimo 
.tomcat 
.valve.GeronimoBeforeAfterValve.invoke(GeronimoBeforeAfterValve.java: 
47)
   [exec]     at
org 
.apache 
.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
   [exec]     at
org 
.apache 
.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
   [exec]     at
org 
.apache 
.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java: 
109)
   [exec]     at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java: 
563)
   [exec]     at
org 
.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java: 
261)
   [exec]     at
org 
.apache.coyote.http11.Http11Processor.process(Http11Processor.java: 
844)
   [exec]     at
org.apache.coyote.http11.Http11Protocol 
$Http11ConnectionHandler.process(Http11Protocol.java:581)
   [exec]     at
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java: 
447)
   [exec]     at java.lang.Thread.run(Thread.java:619)
   [exec] 07:12:28,046 ERROR [[jsp]] Servlet.service() for servlet jsp
threw exception
   [exec] java.lang.Exception: <openjpa-1.0.0-r420667:568756 nonfatal
store error> org.apache.openjpa.persistence.OptimisticLockException:  
An
optimistic lock violation was detected when flushing object instance
"vt.bean.entity.Director-1192302" to the data store.  This indicates  
that
the object was concurrently modified in another transaction.
   [exec] FailedObject: vt.bean.entity.Director-1192302
   [exec]     at
org 
.apache 
.openjpa.util.Exceptions.replaceNestedThrowables(Exceptions.java:242)
   [exec]     at
org 
.apache 
.openjpa 
.persistence 
.OptimisticLockException.writeObject(OptimisticLockException.java:101)
   [exec]     at sun.reflect.GeneratedMethodAccessor179.invoke(Unknown
Source)
   [exec]     at
sun 
.reflect 
.DelegatingMethodAccessorImpl 
.invoke(DelegatingMethodAccessorImpl.java:25)
   [exec]     at java.lang.reflect.Method.invoke(Method.java:597)
   [exec]     at
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java: 
945)
   [exec]     at
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java: 
1461)
   [exec]     at
java 
.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java: 
1392)
   [exec]     at
java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1150)
   [exec]     at
java 
.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java: 
1509)
   [exec]     at
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java: 
1474)
   [exec]     at
java 
.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java: 
1392)
   [exec]     at
java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1150)
   [exec]     at
java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:326)
   [exec]     at
org 
.apache 
.openejb 
.core.ivm.BaseEjbProxyHandler.copyObj(BaseEjbProxyHandler.java:508)
   [exec]     at
org 
.apache 
.openejb 
.core.ivm.BaseEjbProxyHandler.invoke(BaseEjbProxyHandler.java:250)
   [exec]     at
org 
.apache 
.openejb 
.util 
.proxy.Jdk13InvocationHandler.invoke(Jdk13InvocationHandler.java:49)
   [exec]     at $Proxy23.removeDirectors(Unknown Source)
   [exec]     at
org.apache.jsp.removeTool_jsp._jspService(removeTool_jsp.java:163)
   [exec]     at
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
   [exec]     at
javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
   [exec]     at
org 
.apache 
.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:388)
   [exec]     at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java: 
320)
   [exec]     at
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
   [exec]     at
javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
   [exec]     at
org 
.apache 
.catalina 
.core 
.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java: 
290)
   [exec]     at
org 
.apache 
.catalina 
.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
   [exec]     at
org 
.apache 
.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java: 
230)
   [exec]     at
org 
.apache 
.catalina.core.StandardContextValve.invoke(StandardContextValve.java: 
175)
   [exec]     at
org 
.apache 
.geronimo 
.tomcat.valve.DefaultSubjectValve.invoke(DefaultSubjectValve.java:56)
   [exec]     at
org.apache.geronimo.tomcat.GeronimoStandardContext 
$SystemMethodValve.invoke(GeronimoStandardContext.java:353)
   [exec]     at
org 
.apache 
.geronimo 
.tomcat 
.valve.GeronimoBeforeAfterValve.invoke(GeronimoBeforeAfterValve.java: 
47)
   [exec]     at
org 
.apache 
.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
   [exec]     at
org 
.apache 
.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
   [exec]     at
org 
.apache 
.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java: 
109)
   [exec]     at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java: 
563)
   [exec]     at
org 
.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java: 
261)
   [exec]     at
org 
.apache.coyote.http11.Http11Processor.process(Http11Processor.java: 
844)
   [exec]     at
org.apache.coyote.http11.Http11Protocol 
$Http11ConnectionHandler.process(Http11Protocol.java:581)
   [exec]     at
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java: 
447)
   [exec]     at java.lang.Thread.run(Thread.java:619)
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