xerno opened a new issue, #9337:
URL: https://github.com/apache/netbeans/issues/9337
### Apache NetBeans version
Apache NetBeans 29
### What happened
Maven accepts both -T 2 (two tokens) and -T2 (single token) as equivalent
parallel build syntax. In the NetBeans Goals field, these naturally produce
different nbactions.xml structures:
- -T 2 -> ```<goal>-T</goal><goal>2</goal>``` - works correctly, parallel
build detected, output displays fine
- -T2 -> ```<goal>-T2</goal>``` - build runs fine, but Output window
throws NPE:
```
java.lang.NullPointerException: Cannot read field "type" because "start"
is null
at
o.n.m.maven.execute.CommandLineOutputHandler.trimTree(CommandLineOutputHandler.java:588)
at
o.n.m.maven.execute.CommandLineOutputHandler.processExecEvent(CommandLineOutputHandler.java:475)
at
o.n.m.maven.execute.CommandLineOutputHandler$Output.run(CommandLineOutputHandler.java:293)
```
It appears that the compact form is not recognized as a parallel build, so
the output tree-folding stays active and crashes on interleaved events from
concurrent modules.
Workaround: Use -T 2 (with space) instead of -T2 in the Goals field.
### Language / Project Type / NetBeans Component
Java Maven multi-module project
### How to reproduce
1. Open any Maven multi-module project with at least 2 independent modules
2. In the Goals field (or directly in nbactions.xml), configure a build
action with -T2 as a single goal:
```
<goals>
<goal>-T2</goal>
<goal>clean</goal>
<goal>install</goal>
</goals>
```
3. Run the action
4. Observe the Output window — build succeeds but the output tree is
corrupted and the NPE appears
For comparison, change to -T 2 (two separate goals):
```
<goals>
<goal>-T</goal>
<goal>2</goal>
<goal>clean</goal>
<goal>install</goal>
</goals>
```
This works correctly.
### Did this work correctly in an earlier version?
No / Don't know
### Operating System
Mac OS X version 26.5 / aarch64
### JDK
OpenJDK 64-Bit Server VM 25.0.2+10-LTS
### Apache NetBeans packaging
Apache NetBeans binary zip
### Anything else
Related:
- #5479
- #3675
### Are you willing to submit a pull request?
Yes
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