diff --git a/Samples/SwiftJavaExtractJNISampleApp/Sources/MySwiftLibrary/Throw.swift b/Samples/SwiftJavaExtractJNISampleApp/Sources/MySwiftLibrary/Throw.swift
index f3696828f..8eb18fcb6 100644
--- a/Samples/SwiftJavaExtractJNISampleApp/Sources/MySwiftLibrary/Throw.swift
+++ b/Samples/SwiftJavaExtractJNISampleApp/Sources/MySwiftLibrary/Throw.swift
@@ -15,5 +15,8 @@
 import SwiftJava
 
 public func throwString(input: String) throws -> String {
-  input
+  if input.isEmpty {
+    throw MySwiftError.swiftError
+  }
+  return input
 }
diff --git a/Samples/SwiftJavaExtractJNISampleApp/src/test/java/com/example/swift/ThrowTest.java b/Samples/SwiftJavaExtractJNISampleApp/src/test/java/com/example/swift/ThrowTest.java
index 666b618ba..e0d5440a6 100644
--- a/Samples/SwiftJavaExtractJNISampleApp/src/test/java/com/example/swift/ThrowTest.java
+++ b/Samples/SwiftJavaExtractJNISampleApp/src/test/java/com/example/swift/ThrowTest.java
@@ -25,4 +25,13 @@ void throwString() throws Exception {
         String result = MySwiftLibrary.throwString("hey");
         assertEquals("hey", result);
     }
+
+    @Test
+    void throwStringActuallyThrows() {
+        Exception exception = assertThrows(Exception.class, () -> {
+            MySwiftLibrary.throwString("");
+        });
+        assertNotNull(exception.getMessage());
+        assertTrue(exception.getMessage().contains("swiftError"));
+    }
 }