From eaed3ee4f592a0e14de8b0d04f662e9614796190 Mon Sep 17 00:00:00 2001
From: zkyTech <zhangkunyuan@hotmail.com>
Date: Wed, 31 Dec 2025 20:13:03 +0800
Subject: [PATCH] Fix NullPointerException when updating interpreter settings
 from frontend

When updating interpreter configuration from the frontend, the new
InterpreterOption object is deserialized from JSON without zConf being
set (as it's a transient field). This causes NPE when executing
paragraphs and checking user authorization.

Changes:
- InterpreterSetting.setOption(): Automatically set zConf on the new
  option to ensure configuration consistency
- InterpreterOption.getOwners(): Add null check for zConf to prevent
  NPE in edge cases

Fixes the issue where modifying interpreter settings in the UI causes
NullPointerException during paragraph execution.
---
 .../org/apache/zeppelin/interpreter/InterpreterOption.java    | 2 +-
 .../org/apache/zeppelin/interpreter/InterpreterSetting.java   | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/zeppelin-interpreter/src/main/java/org/apache/zeppelin/interpreter/InterpreterOption.java b/zeppelin-interpreter/src/main/java/org/apache/zeppelin/interpreter/InterpreterOption.java
index f7b17e362e6..a487ab0b6db 100644
--- a/zeppelin-interpreter/src/main/java/org/apache/zeppelin/interpreter/InterpreterOption.java
+++ b/zeppelin-interpreter/src/main/java/org/apache/zeppelin/interpreter/InterpreterOption.java
@@ -73,7 +73,7 @@ public void setUserPermission(boolean setPermission) {
   }
 
   public List<String> getOwners() {
-    if (null != owners && zConf.isUsernameForceLowerCase()) {
+    if (null != owners && zConf != null && zConf.isUsernameForceLowerCase()) {
       List<String> lowerCaseUsers = new ArrayList<>();
       for (String owner : owners) {
         lowerCaseUsers.add(owner.toLowerCase());
diff --git a/zeppelin-zengine/src/main/java/org/apache/zeppelin/interpreter/InterpreterSetting.java b/zeppelin-zengine/src/main/java/org/apache/zeppelin/interpreter/InterpreterSetting.java
index 2adaa55a42b..4181ff761ec 100644
--- a/zeppelin-zengine/src/main/java/org/apache/zeppelin/interpreter/InterpreterSetting.java
+++ b/zeppelin-zengine/src/main/java/org/apache/zeppelin/interpreter/InterpreterSetting.java
@@ -699,6 +699,10 @@ public InterpreterOption getOption() {
 
   public void setOption(InterpreterOption option) {
     this.option = option;
+    // Ensure zConf is set for the new option to avoid NullPointerException
+    if (this.zConf != null) {
+      this.option.setConf(this.zConf);
+    }
   }
 
   public String getInterpreterDir() {