[jboss-user] [JBoss Cache Users] - Null element in the Vector
I am chasing after a strange issue in pojo cache:
There is a Vector that I am using it as a queue
one Thread is pushing things into the tail and
the other poping the head of the Vector.
The Vector is being aspectize with the following
configuration (pojocache-aop.xml):
| <?xml version="1.0" encoding="UTF-8"?>
| <!--
| This is a variant of jboss-aop.xml.
| -->
| <aop>
| <!-- If a POJO has a Replicable annotation, it will be asepectized. -->
|
| <!--
| Supports inheritance and polymorphism. It can either be a concrete class
| or an interface. All sub-classes or interface implementors will be
|
| instrumeneted.
| -->
| <prepare expr="field(* $instanceof
|
| {(a)org.jboss.cache.pojo.annotation.Replicable}->*)" />
|
| <!-- Work around that ensures annotated classes which do not access
|
| fields are instrumented -->
| <introduction expr="class($instanceof
|
| {(a)org.jboss.cache.pojo.annotation.Replicable})"/>
|
| <!-- Array support -->
| <!-- Comment entire section to disable -->
| <arrayreplacement expr="class($instanceof
|
| {(a)org.jboss.cache.pojo.annotation.Replicable})"/>
| <interceptor name="pojocache-array"
|
| class="org.jboss.cache.pojo.interceptors.dynamic.ArrayInterceptor"/>
| <introduction expr="class($instanceof
|
| {(a)org.jboss.cache.pojo.annotation.Replicable})">
|
<interfaces>org.jboss.cache.pojo.impl.ArrayInterceptable</interfaces>
| </introduction>
| <arraybind name="pojocache-array" type="READ_WRITE">
| <interceptor-ref name="pojocache-array"/>
| </arraybind>
|
| </aop>
|
I have tried different cache configurations, the last one is like this:
| Configuration config = new Configuration();
| config.setTransactionManagerLookupClass(
JBossTransactionManagerLookup.class.getName() );
| config.setIsolationLevel(IsolationLevel.SERIALIZABLE);
| config.setCacheMode(CacheMode.REPL_SYNC);
| config.setLockAcquisitionTimeout(30000);
| config.setClusterName("DefaultPartition");
| config.setConcurrencyLevel(5000);
| config.setNodeLockingScheme(NodeLockingScheme.PESSIMISTIC);
|
|
The vector is placed inside the pojo cache on JBoss 5.1.0 GA.
And then I see the following problem happens from time to time:
I see null elements apears inside the vector when I have cirtanly
no code that puts it there and by inspecting the logs I see
that it happens when there is concurrent activity on the Vector.
Before I am going to open a bug on it, I would like to know if
there is someone else that has similar expirience and maybe know
about any work around to prevent this behavior.
Regards
Roman
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