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POSpring Batch multithread throwing java.lang.Thread.State
 

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    <p>I have a web application developed using <code>Grails</code>, <code>Spring</code>, <code>Java</code> and <code>Hibernate</code>. </p> <p>It contains a batch job implemented using <code>Spring Batch</code>. When I run the job without multithreading it works fine. As soon as I introduce partitioning (and every partition is handled by a different thread/multi threading) after some processing some of the thread get stuck in an infinite loop and never comes back.</p> <p>Following is the stack trace when thread gets stuck.</p> <pre><code>java.lang.Thread.State: RUNNABLE at org.apache.commons.collections.map.AbstractHashedMap.getEntry(AbstractHashedMap.java:440) at org.apache.commons.collections.map.AbstractReferenceMap.getEntry(AbstractReferenceMap.java:405) at org.apache.commons.collections.map.AbstractReferenceMap.get(AbstractReferenceMap.java:230) at org.grails.datastore.mapping.core.AbstractDatastore.getObjectErrors(AbstractDatastore.java:160) at org.grails.datastore.mapping.core.Datastore$getObjectErrors.call(Unknown Source) at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:42) at org.grails.datastore.mapping.core.Datastore$getObjectErrors.call(Unknown Source) at org.grails.datastore.gorm.GormValidationApi.getErrors(GormValidationApi.groovy:137) at sun.reflect.GeneratedMethodAccessor580.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at com.springsource.loaded.ri.ReflectiveInterceptor.jlrMethodInvoke(ReflectiveInterceptor.java:1231) at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:90) at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:233) at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1047) at groovy.lang.ExpandoMetaClass.invokeMethod(ExpandoMetaClass.java:1110) at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:877) at org.codehaus.groovy.runtime.InvokerHelper.invokePogoMethod(InvokerHelper.java:793) at org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:776) at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodN(ScriptBytecodeAdapter.java:164) at org.grails.datastore.gorm.InstanceMethodInvokingClosure.call(GormEnhancer.groovy:257) at org.codehaus.groovy.runtime.metaclass.ClosureStaticMetaMethod.invoke(ClosureStaticMetaMethod.java:59) at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:233) at groovy.lang.MetaClassImpl.getProperty(MetaClassImpl.java:1580) at groovy.lang.ExpandoMetaClass.getProperty(ExpandoMetaClass.java:1140) at groovy.lang.MetaClassImpl.getProperty(MetaClassImpl.java:3308) at groovy.lang.ExpandoMetaClass.getProperty(ExpandoMetaClass.java:1152) at org.codehaus.groovy.grails.orm.hibernate.metaclass.AbstractDynamicPersistentMethod.setupErrorsProperty(AbstractDynamicPersistentMethod.java:100) </code></pre> <p>This is just a portion of thread trace.</p> <p>This trace only tells me about the a method in which my thread got stuck. It does not tell me any details and method is pretty big to search for a problem. Can any one please help me in this matter telling me:</p> <p>1) What is wrong looking at the trace?</p> <p>2) How can I see more detailed stack trace? </p>
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    1. COIt's hard to tell the exact problem without more information. A guess is there some type of contention occurring either at the database level or within the code, based on the multi-threaded behavior causing the problem. Possibly check the database for contention. Another thought is to download the apache commons collections map source code and set break points or try to see exactly what is being attempted when the thread freezes.
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