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kwin pushed a commit to branch 
feature/throw-uoe-for-multipagesinkfactory-createSink
in repository https://gitbox.apache.org/repos/asf/maven-site-plugin.git

commit 6c1d52ba598e24ce3a8c98227a6e8f861a0a5e57
Author: Konrad Windszus <[email protected]>
AuthorDate: Fri Feb 20 20:29:37 2026 +0100

    Throw UOE for unsupported MultiPageSinkFactory.createSink(...) overloads
    
    This prevent NPE which was previously experienced due to non-allowed
    null value being returned.
    
    This closes #1231
---
 .../maven/plugins/site/render/ReportDocumentRenderer.java    | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git 
a/src/main/java/org/apache/maven/plugins/site/render/ReportDocumentRenderer.java
 
b/src/main/java/org/apache/maven/plugins/site/render/ReportDocumentRenderer.java
index 26f04ec9..a33d4ffc 100644
--- 
a/src/main/java/org/apache/maven/plugins/site/render/ReportDocumentRenderer.java
+++ 
b/src/main/java/org/apache/maven/plugins/site/render/ReportDocumentRenderer.java
@@ -147,20 +147,20 @@ public class ReportDocumentRenderer implements 
DocumentRenderer {
 
         @Override
         public Sink createSink(File arg0, String arg1, String arg2) throws 
IOException {
-            // Not used
-            return null;
+            throw new UnsupportedOperationException(
+                    "Only createSink(File, String) is supported by 
MultiPageSinkFactory");
         }
 
         @Override
         public Sink createSink(OutputStream arg0) throws IOException {
-            // Not used
-            return null;
+            throw new UnsupportedOperationException(
+                    "Only createSink(File, String) is supported by 
MultiPageSinkFactory");
         }
 
         @Override
         public Sink createSink(OutputStream arg0, String arg1) throws 
IOException {
-            // Not used
-            return null;
+            throw new UnsupportedOperationException(
+                    "Only createSink(File, String) is supported by 
MultiPageSinkFactory");
         }
 
         public List<MultiPageSubSink> sinks() {

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