chore: Nextdelay must be greater than 0

Signed-off-by: Javier Aliaga <javier@diagrid.io>

Author: javier-aliaga

durabletask-client/src/main/java/io/dapr/durabletask/TaskOrchestrationExecutor.java

@@ -1525,6 +1525,7 @@ private Duration getNextDelay() {
             long seed = this.firstAttempt.toEpochMilli() + this.attemptNumber;
             double reduction = new Random(seed).nextDouble() * jitterFactor;
             nextDelayInMillis = (long) (nextDelayInMillis * (1.0 - reduction));
+            nextDelayInMillis = Math.max(nextDelayInMillis, 1);
           }
 
           return Duration.ofMillis(nextDelayInMillis);

durabletask-client/src/test/java/io/dapr/durabletask/RetryPolicyTest.java

@@ -96,4 +96,24 @@ void zeroJitterLeavesDelayUnchanged() {
 
     assertEquals(baseDelayMillis, reduced);
   }
+
+  /**
+   * With jitterFactor=1.0 the delay must never drop below 1ms,
+   * even when nextDouble() approaches 1.0.
+   */
+  @Test
+  void jitterWithMaxFactorNeverProducesZeroDelay() {
+    long baseDelayMillis = 1L; // smallest meaningful delay
+    double jitterFactor = 1.0;
+
+    for (int seedOffset = 0; seedOffset < 1000; seedOffset++) {
+      long seed = seedOffset;
+      double reduction = new Random(seed).nextDouble() * jitterFactor;
+      long reduced = (long) (baseDelayMillis * (1.0 - reduction));
+      reduced = Math.max(reduced, 1);
+
+      assertTrue(reduced >= 1,
+          "Delay must be at least 1ms, but was " + reduced + " for seed " + seed);
+    }
+  }
 }