elharo opened a new issue, #138:
URL: https://github.com/apache/maven-shared-jar/issues/138
In `JarClassesAnalysis.java:153-155`:
```java
JarVersionedRuntime rootContentVersionedRuntime =
runtimeVersionsMap.remove(ROOT);
jarData.setRootEntries(rootContentVersionedRuntime.getEntries()); // NPE if
no ROOT
```
If a malformed multi-release JAR has no root-level entries (every entry is
under `META-INF/versions/N/`), `runtimeVersionsMap` has no `ROOT` key,
`remove(ROOT)` returns `null`, and `.getEntries()` throws a
NullPointerException.
**Fix**: Guard against null:
```java
JarVersionedRuntime rootContent = runtimeVersionsMap.remove(ROOT);
if (rootContent != null) {
jarData.setRootEntries(rootContent.getEntries());
}
```
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