elharo opened a new issue, #514:
URL: https://github.com/apache/maven-ear-plugin/issues/514
## Description
In `AbstractEarModule.java:158`, a NullPointerException occurs if
`resolveArtifact()` is called before `setEarExecutionContext()`:
```java
final ArtifactRepository ar = earExecutionContext.getArtifactRepository();
```
Modules are created via a factory and then the execution context is set
afterward. If `resolveArtifact()` is called before `setEarExecutionContext()`
has been invoked, `earExecutionContext` is null and `.getArtifactRepository()`
throws an NPE.
## Expected behavior
Add a null guard:
```java
if (earExecutionContext == null) {
throw new MojoExecutionException("EarExecutionContext not initialized
for module " + this);
}
```
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