sdedic opened a new pull request, #5124:
URL: https://github.com/apache/netbeans/pull/5124
The bug that provoked the investigation was
```
java.lang.NullPointerException
at java.base/java.util.ArrayList.(ArrayList.java:179)
at
org.netbeans.modules.gradle.tooling.NbProjectInfoBuilder.detectSources(NbProjectInfoBuilder.java:1012)
at
org.netbeans.modules.gradle.tooling.NbProjectInfoBuilder.lambda$runAndRegisterPerf$9(NbProjectInfoBuilder.java:408)
at
org.netbeans.modules.gradle.tooling.NbProjectInfoBuilder.runAndRegisterPerf(NbProjectInfoBuilder.java:414)
at
org.netbeans.modules.gradle.tooling.NbProjectInfoBuilder.runAndRegisterPerf(NbProjectInfoBuilder.java:408)
at
org.netbeans.modules.gradle.tooling.NbProjectInfoBuilder.buildAll(NbProjectInfoBuilder.java:211)
at
org.netbeans.modules.gradle.tooling.NetBeansToolingPlugin$NetBeansToolingModelBuilder.buildAll(NetBeansToolingPlugin.java:71)
```
that was thrown when the project contained `kotlin` sources. The bug was
introduced by a change in `getProperty` that stopped throwing exceptions on an
unknown property, and started to return `null` instead. The PR just adapts the
`detectSource` code to the new error reporting style.
During testing, I've noticed some other bad behaviour I have not seen before
on certain projects:
- the task Map is not cloned on return by Gradle (it seems), so I've got a
ConcurrentModificationException - apparently some of the looped-over calls
lazy-populated the collection
- `null` default property value was not handled well (changed to
`Optional.ofNullable`).
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