test: reproducer for issue spotbugs#3310

spotbugs-tests/src/test/java/edu/umd/cs/findbugs/detect/Issue3310Test.java

@@ -0,0 +1,15 @@
+package edu.umd.cs.findbugs.detect;
+
+import edu.umd.cs.findbugs.AbstractIntegrationTest;
+import org.junit.jupiter.api.Test;
+
+class Issue3310Test extends AbstractIntegrationTest {
+
+    @Test
+    void testIssue() {
+        performAnalysis("ghIssues/Issue3310.class",
+                "ghIssues/Issue3310$Result.class");
+
+        assertNoBugInClass("AT_STALE_THREAD_WRITE_OF_PRIMITIVE", "Issue3310");
+    }
+}

spotbugsTestCases/src/java/ghIssues/Issue3310.java

@@ -0,0 +1,31 @@
+package ghIssues;
+
+import java.lang.invoke.MethodHandle;
+import java.util.Map;
+
+public class Issue3310 {
+	private volatile int x;
+
+	public <K, V> Object test(Map<K, V> map, K key) {
+		Result result = new Result();
+		map.compute(key, (k, oldValue) -> {
+			V newValue = oldValue;
+			result.written = true;
+			return newValue;
+		});
+
+		if (result.written) {
+			return result;
+		} else {
+			return null;
+		}
+	}
+
+	public void setX(int x) {
+		this.x = x;
+	}
+
+	public static class Result {
+		boolean written;
+	}
+}