polastre opened a new issue, #735:
URL: https://github.com/apache/incubator-baremaps/issues/735

   When importing the workflow.json for `examples/openstreetmap`, it fails with:
   
   ```
   RelationGeometryBuilder - Unable to build the geometry for relation #5401257
   ```
   
   Running:
   ```
   cd examples/openstreetmap
   baremaps workflow execute --file=workflow.json --log-level=DEBUG
   ```
   
   Full error:
   ```
   [WARN ] 2023-07-21 15:00:09.050 [ForkJoinPool.commonPool-worker-33] 
RelationGeometryBuilder - Unable to build the geometry for relation #5401257
   org.apache.baremaps.stream.StreamException: java.lang.NullPointerException: 
Cannot invoke "java.util.List.stream()" because "refs" is null
           at 
org.apache.baremaps.openstreetmap.function.RelationGeometryBuilder.createLine(RelationGeometryBuilder.java:168)
 ~[baremaps-core-0.7.1.jar:?]
           at 
org.apache.baremaps.openstreetmap.function.RelationGeometryBuilder.lambda$createPolygons$2(RelationGeometryBuilder.java:143)
 ~[baremaps-core-0.7.1.jar:?]
           at 
java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) ~[?:?]
           at 
java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:179) ~[?:?]
           at 
java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:179) ~[?:?]
           at 
java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1625) 
~[?:?]
           at 
java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509) ~[?:?]
           at 
java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499) 
~[?:?]
           at 
java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) 
~[?:?]
           at 
java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
 ~[?:?]
           at 
java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:?]
           at 
java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596) ~[?:?]
           at 
org.apache.baremaps.openstreetmap.function.RelationGeometryBuilder.createPolygons(RelationGeometryBuilder.java:142)
 ~[baremaps-core-0.7.1.jar:?]
           at 
org.apache.baremaps.openstreetmap.function.RelationGeometryBuilder.accept(RelationGeometryBuilder.java:71)
 ~[baremaps-core-0.7.1.jar:?]
           at 
org.apache.baremaps.openstreetmap.function.EntityGeometryBuilder.accept(EntityGeometryBuilder.java:54)
 ~[baremaps-core-0.7.1.jar:?]
           at 
org.apache.baremaps.openstreetmap.function.EntityGeometryBuilder.accept(EntityGeometryBuilder.java:27)
 ~[baremaps-core-0.7.1.jar:?]
           at java.util.function.Consumer.lambda$andThen$0(Consumer.java:65) 
~[?:?]
           at java.util.function.Consumer.lambda$andThen$0(Consumer.java:65) 
~[?:?]
           at java.util.ArrayList.forEach(ArrayList.java:1511) ~[?:?]
           at 
org.apache.baremaps.openstreetmap.function.BlockEntitiesHandler.accept(BlockEntitiesHandler.java:47)
 ~[baremaps-core-0.7.1.jar:?]
           at 
org.apache.baremaps.openstreetmap.function.BlockEntitiesHandler.accept(BlockEntitiesHandler.java:25)
 ~[baremaps-core-0.7.1.jar:?]
           at 
org.apache.baremaps.stream.ConsumerUtils.lambda$consumeThenReturn$1(ConsumerUtils.java:46)
 ~[baremaps-core-0.7.1.jar:?]
           at 
java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197) ~[?:?]
           at 
java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197) ~[?:?]
           at 
org.apache.baremaps.stream.BufferedSpliterator.tryAdvance(BufferedSpliterator.java:74)
 ~[baremaps-core-0.7.1.jar:?]
           at 
java.util.stream.StreamSpliterators$WrappingSpliterator.lambda$initPartialTraversalState$0(StreamSpliterators.java:292)
 ~[?:?]
           at 
java.util.stream.StreamSpliterators$AbstractWrappingSpliterator.fillBuffer(StreamSpliterators.java:206)
 ~[?:?]
           at 
java.util.stream.StreamSpliterators$AbstractWrappingSpliterator.doAdvance(StreamSpliterators.java:169)
 ~[?:?]
           at 
java.util.stream.StreamSpliterators$WrappingSpliterator.tryAdvance(StreamSpliterators.java:298)
 ~[?:?]
           at 
org.apache.baremaps.stream.BatchedSpliterator.tryAdvance(BatchedSpliterator.java:48)
 ~[baremaps-core-0.7.1.jar:?]
           at 
org.apache.baremaps.stream.BatchedSpliterator.trySplit(BatchedSpliterator.java:59)
 ~[baremaps-core-0.7.1.jar:?]
           at 
java.util.stream.ForEachOps$ForEachTask.compute(ForEachOps.java:289) ~[?:?]
           at 
java.util.concurrent.CountedCompleter.exec(CountedCompleter.java:754) ~[?:?]
           at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:373) 
~[?:?]
           at 
java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1182)
 ~[?:?]
           at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1655) 
~[?:?]
           at 
java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1622) ~[?:?]
           at 
java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:165) 
~[?:?]
   Caused by: java.lang.NullPointerException: Cannot invoke 
"java.util.List.stream()" because "refs" is null
           at 
org.apache.baremaps.openstreetmap.function.RelationGeometryBuilder.createLine(RelationGeometryBuilder.java:164)
 ~[baremaps-core-0.7.1.jar:?]
           ... 37 more
   ```


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