One more thing. In this single jstack output, there are 15 threads/stacks doing Util.cloneViaSerialization like the stack below!
- Tore. > Hello. > > In the jstack-output I am looking at now, there are several threads doing > a Util.cloneViaSerialization on some basic prefetching for a SelectQuery. > Down the java.io.ObjectOutputStream road there is some locking going on. > Is Util.cloneViaSerialization really needed here? This is with 3.1M2. > > Regards, > - Tore. > > "qtp1661944297-498" prio=10 tid=0x00007f48d0189000 nid=0x51ec in > Object.wait() [0x00007f48c37f4000] > java.lang.Thread.State: WAITING (on object monitor) > at java.lang.Object.wait(Native Method) > - waiting on <0x00007f49bb212090> (a > java.io.ObjectStreamClass$EntryFuture) > at java.lang.Object.wait(Object.java:485) > at java.io.ObjectStreamClass$EntryFuture.get(ObjectStreamClass.java:371) > - locked <0x00007f49bb212090> (a java.io.ObjectStreamClass$EntryFuture) > at java.io.ObjectStreamClass.lookup(ObjectStreamClass.java:305) > at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1114) > at > java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1518) > at > java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1483) > at > java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400) > at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158) > at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:330) > at org.apache.cayenne.util.Util.cloneViaSerialization(Util.java:346) > at > org.apache.cayenne.query.BaseQueryMetadata.setPrefetchTree(BaseQueryMetadata.java:332) > at > org.apache.cayenne.query.SelectQuery.setPrefetchTree(SelectQuery.java:416) > at > org.apache.cayenne.query.SelectQueryPrefetchRouterAction.startDisjointPrefetch(SelectQueryPrefetchRouterAction.java:116) > at > org.apache.cayenne.query.SelectQueryPrefetchRouterAction.startUnknownPrefetch(SelectQueryPrefetchRouterAction.java:135) > at > org.apache.cayenne.query.PrefetchTreeNode.traverse(PrefetchTreeNode.java:173) > at > org.apache.cayenne.query.PrefetchTreeNode.traverse(PrefetchTreeNode.java:179) > at > org.apache.cayenne.query.SelectQueryPrefetchRouterAction.route(SelectQueryPrefetchRouterAction.java:54) > at > org.apache.cayenne.query.SelectQuery.routePrefetches(SelectQuery.java:179) > at org.apache.cayenne.query.SelectQuery.route(SelectQuery.java:169) > at > org.apache.cayenne.access.DataDomainQueryAction.runQuery(DataDomainQueryAction.java:414) > at > org.apache.cayenne.access.DataDomainQueryAction.access$000(DataDomainQueryAction.java:69) > at > org.apache.cayenne.access.DataDomainQueryAction$2.transform(DataDomainQueryAction.java:395) > at > org.apache.cayenne.access.DataDomain.runInTransaction(DataDomain.java:824) > at > org.apache.cayenne.access.DataDomainQueryAction.runQueryInTransaction(DataDomainQueryAction.java:392) > at > org.apache.cayenne.access.DataDomainQueryAction.execute(DataDomainQueryAction.java:121) > at > org.apache.cayenne.access.DataDomain.onQueryNoFilters(DataDomain.java:706) > at > org.apache.cayenne.access.DataDomain$DataDomainQueryFilterChain.onQuery(DataDomain.java:944) > at org.apache.cayenne.access.DataDomain.onQuery(DataDomain.java:696) > at > org.apache.cayenne.util.ObjectContextQueryAction.runQuery(ObjectContextQueryAction.java:336) > at > org.apache.cayenne.util.ObjectContextQueryAction.executePostCache(ObjectContextQueryAction.java:104) > at > org.apache.cayenne.util.ObjectContextQueryAction.execute(ObjectContextQueryAction.java:91) > at org.apache.cayenne.access.DataContext.onQuery(DataContext.java:983) > at > org.apache.cayenne.access.DataContext.performQuery(DataContext.java:972) > > > >
