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Posted to notifications@texera.apache.org by "Yicong-Huang (via GitHub)" <gi...@apache.org> on 2026/05/03 03:39:48 UTC
[I] LineChartOpDesc.generatePythonCode throws NPE when lines is null (the default) [texera]
Yicong-Huang opened a new issue, #4811:
URL: https://github.com/apache/texera/issues/4811
### What happened?
`common/workflow-operator/src/main/scala/org/apache/texera/amber/operator/visualization/lineChart/LineChartOpDesc.scala` declares `var lines: util.List[LineConfig] = _`, which defaults to `null`. `createPlotlyFigure` then calls `lines.asScala.map(...)` without a null check, so `generatePythonCode` on a freshly constructed `LineChartOpDesc` raises `java.lang.NullPointerException` at `LineChartOpDesc.scala:68` — quite different from the explicit `AssertionError` paths used by sibling visualizers (e.g. `HeatMapOpDesc`, `BarChartOpDesc`).
The fix is either to default `lines` to an empty list, or to null-guard / assert nonEmpty before the `.asScala.map(...)` call.
### How to reproduce?
```scala
import org.apache.texera.amber.operator.visualization.lineChart.LineChartOpDesc
new LineChartOpDesc().generatePythonCode()
// java.lang.NullPointerException
// at LineChartOpDesc.createPlotlyFigure(LineChartOpDesc.scala:68)
// at LineChartOpDesc.generatePythonCode(LineChartOpDesc.scala:122)
```
### Version
1.1.0-incubating (Pre-release/Master)
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Re: [I] LineChartOpDesc.generatePythonCode throws NPE when lines is null (the default) [texera]
Posted by "Yicong-Huang (via GitHub)" <gi...@apache.org>.
Yicong-Huang commented on issue #4811:
URL: https://github.com/apache/texera/issues/4811#issuecomment-4369223449
/untake
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Re: [I] LineChartOpDesc.generatePythonCode throws NPE when lines is null (the default) [texera]
Posted by "aglinxinyuan (via GitHub)" <gi...@apache.org>.
aglinxinyuan closed issue #4811: LineChartOpDesc.generatePythonCode throws NPE when lines is null (the default)
URL: https://github.com/apache/texera/issues/4811
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Re: [I] LineChartOpDesc.generatePythonCode throws NPE when lines is null (the default) [texera]
Posted by "Yicong-Huang (via GitHub)" <gi...@apache.org>.
Yicong-Huang commented on issue #4811:
URL: https://github.com/apache/texera/issues/4811#issuecomment-4369222028
/take
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Re: [I] LineChartOpDesc.generatePythonCode throws NPE when lines is null (the default) [texera]
Posted by "Ma77Ball (via GitHub)" <gi...@apache.org>.
Ma77Ball commented on issue #4811:
URL: https://github.com/apache/texera/issues/4811#issuecomment-4368860246
/take
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