GitHub user julianhowarth created a discussion: Simplest way to use Java's
unmodifiable List classes
This is really basic but I'm missing something about the best way to
serialize/deserialize a `List` of objects. The following shows what I'm hitting
but I can't see an answer in the docs:
```java
@Test
void foryLoadList() throws IOException {
var fory = Fory.builder()
.withLanguage(Language.JAVA)
.withRefTracking(true)
.requireClassRegistration(false)
.build();
var items = List.of("foo", "bar", "baz");
try (var outputStream =
new
BufferedOutputStream(Files.newOutputStream(Path.of("output.fory")))) {
outputStream.write(fory.serializeJavaObject(items));
}
try (var input = new
BufferedInputStream(Files.newInputStream(Path.of("output.fory")))) {
var res = (List<String>) fory.deserializeJavaObject(input.readAllBytes(),
List.class);
assertThat(res).isEqualTo(items);
}
}
```
It fails with:
```
org.apache.fory.exception.DeserializationException: Deserialize failed, read
objects are: [null]
at
org.apache.fory.util.ExceptionUtils.handleReadFailed(ExceptionUtils.java:63)
at org.apache.fory.Fory.deserializeJavaObject(Fory.java:1228)
at org.apache.fory.Fory.deserializeJavaObject(Fory.java:1199)
at
com.endeavorstreaming.vesper.content_engine.loader.storage.EventSourcingForyTest.foryLoadList(EventSourcingForyTest.java:113)
at java.base/java.lang.reflect.Method.invoke(Method.java:565)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1604)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1604)
Caused by: java.lang.UnsupportedOperationException: Class interface
java.util.List doesn't support serialization.
at
org.apache.fory.resolver.ClassResolver.getSerializerClass(ClassResolver.java:994)
at
org.apache.fory.resolver.ClassResolver.getSerializerClass(ClassResolver.java:988)
at
org.apache.fory.resolver.ClassResolver.createSerializer(ClassResolver.java:1377)
at
org.apache.fory.resolver.ClassResolver.getClassInfo(ClassResolver.java:1250)
at org.apache.fory.Fory.deserializeJavaObject(Fory.java:1220)
... 5 more
```
using version `0.14.1`
In my actual use case the list is being generated from a `stream.map(...) ...
.toList()` and we prefer immutable types so I can't just switch to an
`ArrayList` for example. I've noticed that an array would work fine too , but
I'd prefer not to have to incur the conversion/copy cost each time it is called.
Is there a simple solution to allow this to work?
GitHub link: https://github.com/apache/fory/discussions/3239
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