sszuev commented on issue #2195:
URL: https://github.com/apache/jena/issues/2195#issuecomment-1892410709
One more exception. This time "Transactions cannot be nested!"
```
GraphTxn g = new GraphTxn();
System.out.println(g.find().toList().size()); // if g.size() no exception
g.begin(TxnType.READ);
System.out.println(g.size());
g.end();
```
```
org.apache.jena.sparql.JenaTransactionException: Transactions cannot be
nested!
at
org.apache.jena.sparql.core.mem.DatasetGraphInMemory.begin(DatasetGraphInMemory.java:149)
at org.apache.jena.sparql.graph.GraphTxn.begin(GraphTxn.java:67)
at com.gitlab.sszuev.playjena.GraphTxnTest.test(GraphTxnTest.java:30)
at java.base/java.lang.reflect.Method.invoke(Method.java:577)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
```
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