elharo opened a new issue, #135:
URL: https://github.com/apache/maven-shared-jar/issues/135
In `JarVersionedRuntimes.java:47-49`:
```java
public JarClasses getJarClasses(Integer version) {
return versionedRuntimeMap.get(version).getJarClasses(); // NPE if
version absent
}
```
If the requested `version` is not a key in the map, `get(version)` returns
`null`, then `.getJarClasses()` throws a NullPointerException. This is
inconsistent with `getJarVersionedRuntime()` on the same class, which safely
returns `null` for missing keys. Any caller querying a non-existent version
will crash.
**Fix**: Guard against null, e.g.:
```java
JarVersionedRuntime runtime = versionedRuntimeMap.get(version);
return runtime != null ? runtime.getJarClasses() : null;
```
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