stankiewicz commented on code in PR #40022:
URL: https://github.com/apache/beam/pull/40022#discussion_r3989063541


##########
sdks/java/core/src/test/java/org/apache/beam/sdk/transforms/LatestFnTest.java:
##########
@@ -100,14 +100,14 @@ public void testAddInputSameTimestamp() {
 
   @Test
   public void testAddInputNullAccumulator() {
-    thrown.expect(NullPointerException.class);
+    thrown.expect(IllegalArgumentException.class);
     thrown.expectMessage("accumulator");
     fn.addInput(null, TV);
   }
 
   @Test
   public void testAddInputNullInput() {
-    thrown.expect(NullPointerException.class);
+    thrown.expect(IllegalArgumentException.class);

Review Comment:
   moving away from 
org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Preconditions.checkNotNull;
 to org.apache.beam.sdk.util.Preconditions.checkArgumentNotNull changes 
exception thrown, I'm curious if this is intended. It's not something someone 
would normally catch, just observation. 



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