[maven] 02/02: Prevent NPE

[rf...@apache.org]

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rfscholte pushed a commit to branch MNG-6656
in repository https://gitbox.apache.org/repos/asf/maven.git

commit be5d23d8d6cd4d51a98a87ef473b70cdb9205de2
Author: rfscholte <rf...@apache.org>
AuthorDate: Sun Jun 7 14:25:50 2020 +0200

    Prevent NPE
---
 .../maven/internal/aether/DefaultRepositorySystemSessionFactory.java  | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/maven-core/src/main/java/org/apache/maven/internal/aether/DefaultRepositorySystemSessionFactory.java b/maven-core/src/main/java/org/apache/maven/internal/aether/DefaultRepositorySystemSessionFactory.java
index acd1fce..d90c1d8 100644
--- a/maven-core/src/main/java/org/apache/maven/internal/aether/DefaultRepositorySystemSessionFactory.java
+++ b/maven-core/src/main/java/org/apache/maven/internal/aether/DefaultRepositorySystemSessionFactory.java
@@ -285,7 +285,9 @@ public class DefaultRepositorySystemSessionFactory
     {
         TransformerContext context = (TransformerContext) sessionData.get( TransformerContext.KEY );
         Collection<FileTransformer> transformers = new ArrayList<>();
-        if ( "pom".equals( artifact.getExtension() ) )
+        
+        // In case of install:install-file there's no transformer context, as the goal is unrelated to the lifecycle. 
+        if ( "pom".equals( artifact.getExtension() ) && context != null )
         {
             transformers.add( new FileTransformer()
             {