Hi,

I am currently testing out things internally with the just released 2.7.3 
but I am running into some problems. One seems pretty low-level and is 
worrysome. This is the exception:

Caused by: com.hp.hpl.jena.tdb.TDBException: Allocation attempt on 
NodeTableReadonly
        at 
com.hp.hpl.jena.tdb.nodetable.NodeTableReadonly.getAllocateNodeId(
NodeTableReadonly.java:37)
        at com.hp.hpl.jena.tdb.store.GraphNamedTDB.getGraphNodeId(
GraphNamedTDB.java:149)
        at com.hp.hpl.jena.tdb.store.GraphNamedTDB.countThis(
GraphNamedTDB.java:124)
        at com.hp.hpl.jena.tdb.store.GraphTDBBase.graphBaseSize(
GraphTDBBase.java:178)
        at com.hp.hpl.jena.sparql.graph.GraphBase2.size(
GraphBase2.java:381)
        at com.hp.hpl.jena.sparql.graph.GraphBase2.isEmpty(
GraphBase2.java:432)
        at com.hp.hpl.jena.rdf.model.impl.ModelCom.isEmpty(
ModelCom.java:871)
        at com.ibm.team.jfs.rdf.internal.jena.tdb.JenaTxTdbProvider$8.run(
JenaTxTdbProvider.java:991)
        at com.ibm.team.jfs.rdf.internal.jena.tdb.JenaTxTdbProvider$8.run(
JenaTxTdbProvider.java:1)
        at 
com.ibm.team.jfs.rdf.internal.jena.tdb.JenaTxTdbProvider.storeOperation(
JenaTxTdbProvider.java:204)
        ... 56 more

Unfortunately, I can't seem to reliably reproduce it even though I am not 
running any concurrent tests. Any idea who this kind of exception can 
occur and what I can do to perhaps construct a test case?

none of this has been observed in 2.7.1 so it must be related to recent 
changes

thanks

Simon

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