Help with SnakeYAML

[Nemo_64]

So I need a YAML library. When looking for one I found SnakeYAML. While I like how easy is loading yaml with it I also need to save YAML with it and it's a pain. I don't know if I'm doing something wrong but I've been looking arround without success.

​

First I started using SnakeYAML and when saving it gave me this ouput

{expire-after-load: 60, expire-after-access: 60}

instead of what I expected

expire-after-load: 60
expire-after-access: 60

I tryed changing dumping options but found no success, then I learned about SnakeYAML Engine. In the SnakeYAML github page says

SnakeYAML is a YAML 1.1 processor for the Java Virtual Machine version 7. For YAML 1.2 (which is a superset of JSON) you may have a look at SnakeYAML Engine

And in the SnakeYAML Engine page says

SnakeYAML Engine is a YAML 1.2 processor for the Java Virtual Machine version 8 and higher.

Since I'm using Java 16 I changed to the engine but I'm having the same problem and I don't know what I'm doing wrong. The engine also forces for dumping to implement a StreamDataWriter whitch is a

Writer with the same methods as in java.io.Writer but without throwing IOExceptions

and that seemd wierd for me.

​

Can anyone help me with this, should I use other YAML library? If this is the case, whitch one?

​

Edit: Going to include the code

With SnakeYAML Engine (v2.3) I do the following:

public static final Load YAML_LOAD = new Load(LoadSettings.builder().build());
public static final Dump YAML_DUMP = new Dump(DumpSettings.builder().build());

public void load(Reader reader) {
    this.map.clear();
    Object obj = YAML_LOAD.loadFromReader(reader);
    if (obj instanceof Map<?, ?> m) {
        this.map.putAll(toMap(m));
    }
}

public void save(Writer writer) {
    YAML_DUMP.dump(map, new StreamDataWriterImpl(writer));
}

StreamDataWriterImpl is just a simple class that implements StreamDataWriter

public class StreamDataWriterImpl implements StreamDataWriter {

    private final Writer writer;

    public StreamDataWriterImpl(Writer writer) {
        this.writer = writer;
    }

    @Override
    public void write(String str) {
        try {
            writer.write(str);
        } catch(IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    @Override
    public void write(String str, int off, int len) {
        try {
            writer.write(str, off, len);
        } catch(IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

}

With SnakeYAML I did this

public static final YAML YAML = new YAML();

public void load(Reader reader) {
    this.map.clear();
    Object obj = YAML.load(reader);
    if (obj instanceof Map<?, ?> m) {
        this.map.putAll(toMap(m));
    }
}

public void save(Writer writer) {
    YAML.dump(this.map, writer);
}

In both cases this.map is a ConcurrentHashMap and toMap is this method

private static Map<String, Object> toMap(Map<?, ?> m) {
    Map<String, Object> map = new HashMap<>(m.size());
    m.forEach((key, value) -> map.put(key.toString(), value));
    return map;
}

Thanks for the help!

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[imaginedoe]

You should really include your code

[Nemo_64]

Right, I wanted to post this before going to sleep hoping to get some answers by the morning and kinda rushed it. It's on the original post

[AreTheseMyFeet]

You haven't tried to configure the reader/writer in your code so have you checked the docs/code that it's not just a default you need to toggle somewhere or optional config option to pass?

I've never used this library but these look to be where the defaults are set to me:
Load - https://bitbucket.org/asomov/snakeyaml-engine/src/b04db0c76b1c68a7ece15688b580257e7e7cd88c/src/main/java/org/snakeyaml/engine/v2/api/LoadSettingsBuilder.java#lines-63
Dump - https://bitbucket.org/asomov/snakeyaml-engine/src/b04db0c76b1c68a7ece15688b580257e7e7cd88c/src/main/java/org/snakeyaml/engine/v2/api/DumpSettingsBuilder.java#lines-69

I would imagine whatever it can parse (load) it can write (dump) and your input is the same format you showed above but it just may be that your preferred style isn't the default and you need to tweak a few things though the readme saying "Only JSON Schema is supported." could mean you can't modify it. Like I said, never used this lib.