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Original file line number Diff line number Diff line change
Expand Up @@ -260,8 +260,6 @@ private static BiConsumer<OutputStream, Object> doCreateSerializer() {
writeClass.invoke(oos, obj, false);
} else if (ObjectStreamClass.class.isInstance(obj)) {
writeClassDesc.invoke(oos, obj, false);
} else if (String.class.isInstance(obj)) {
writeClassDesc.invoke(oos, obj, false);
} else if (obj instanceof String) {
writeString.invoke(oos, obj, false);
} else if (obj.getClass().isArray()) {
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Original file line number Diff line number Diff line change
Expand Up @@ -120,6 +120,18 @@ void coder() {
});
}

@Test
void bypassReplaceSerializerHandlesString() {
// Ensures the custom serializer used by SerializationWrapper writes top-level String
// values via writeString instead of falling into the wrong writeClassDesc branch.
scenario((transformer, loader) -> {
final BeamIOTransformer.SerializationWrapper wrapper =
(BeamIOTransformer.SerializationWrapper) BeamIOTransformer.SerializationWrapper
.replace("hello", "test");
assertEquals("hello", wrapper.readResolve());
});
}

@Test
void coderSerialization() {
scenario((transformer, loader) -> {
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