tenthe opened a new issue, #3833:
URL: https://github.com/apache/streampipes/issues/3833
### Body
When a user selects the same data stream multiple times in the live preview,
the application throws a java.lang.IllegalStateException due to a duplicate key
error. This prevents the live preview from functioning correctly.
```
java.lang.IllegalStateException: Duplicate key sp:spdatastream:dzxHfS
(attempted merging values org.apache.streampipes.model.SpDataStream@21010bb2
and org.apache.streampipes.model.SpDataStream@2687acb2)
at
java.base/java.util.stream.Collectors.duplicateKeyException(Collectors.java:135)
at
java.base/java.util.stream.Collectors.lambda$uniqKeysMapAccumulator$1(Collectors.java:182)
at
java.base/java.util.stream.ReduceOps$3ReducingSink.accept(ReduceOps.java:169)
at
java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:179)
at
java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1625)
at
java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
at
java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
at
java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921)
at
java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at
java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:682)
...
```
<img width="875" height="708" alt="Image"
src="https://github.com/user-attachments/assets/34054626-792a-419b-a819-bcd85edd6ce7";
/>
### StreamPipes Committer
I acknowledge that I am a maintainer/committer of the Apache StreamPipes
project.
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