matthiasblaesing opened a new issue, #6881:
URL: https://github.com/apache/netbeans/issues/6881
### Body
I noticed, that when I created a `test.java` file in my `tmp` directory,
NetBeans suddenly started a massive scanning job. It turned out NetBeans
scanned the whole folder, which also included an angular project with ~30.000
files in the `node_modules` folder. What is more, I noticed, that other
projects in the folder were marked as broken.
My gut feeling led me to the changes for the mult-file source launcher and
indeed it has problematic side effect. I could reproduce it like this:
0. Checkout babcc3d5c1c4c454a0e9fbcad99e0500896f07d6 (current master), clean
dir and build NB and run with "ant tryme"
1. Create an empty directory (PATH in the following)
2. Inside the new directory create a new maven project ("Java with Maven ->
Java Application", with default settings, just parent folder changed to PATH)
3. Add `gson` to the `pom.xml` (as child element of the `project` node):
```xml
<dependencies>
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.10.1</version>
</dependency>
</dependencies>
```
5. Ensure dependency is locally present by invoking "Download Declared
Dependencies" on the "Dependencies" node
6. Change class Mavenproject1 to:
```java
package test.mavenproject1;
import com.google.gson.Gson;
import java.util.Collections;
public class Mavenproject1 {
public static void main(String[] args) {
new Gson().toJson(Collections.singletonMap("Hello", "World"));
}
}
```
8. Open Favorites tab and create test.java in the directory created in step 1
**Mavenproject1.java is immediately marked as "has errors**
9. Open "Window -> Action Items" and open `Mavenproject1.java`
**You'll see:**
```
Error Package com.google.gson ist nicht vorhanden
Mavenproject1.java
PATH/mavenproject1/src/main/java/test/mavenproject1/Mavenproject1.java:3
Error Symbol nicht gefunden Symbol: Klasse Gson Ort: Klasse
test.mavenproject1.Mavenproject1 Mavenproject1.java
PATH/mavenproject1/src/main/java/test/mavenproject1/Mavenproject1.java:9
```
10. Remove the directory
11. Revert multi-file launcher:
```bash
git revert 192bb526a9f535485905998674460c1aaafb9b20
git rm
java/java.file.launcher/src/org/netbeans/modules/java/file/launcher/SharedRootData.java
java/java.file.launcher/src/org/netbeans/modules/java/file/launcher/queries/MultiSourceRootProvider.java
git revert --continue
```
13. Build again with `git clean -f -x -d; ant`
14. Run with `ant try`
15. Repeat steps 2-7 and observe, that problems are gone
### Committer
- [X] I acknowledge that I am a maintainer/committer in the Apache NetBeans
project.
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