Return null if exception is thrown converting a message from JSON to an object

[dakotahNorth]

When an exception is thrown from convertFromInternal in ManifoldJsonMessageConverter other converters are tried and an endless loop happens. If an exception is thrown, capture the exception and return null.

@Override
protected Object convertFromInternal(Message<?> message, @NotNull Class<?> targetClass, Object conversionHint) {

    Object payload = message.getPayload();

    if (payload instanceof byte[]) {
        String jsonString = new String((byte[]) payload);
        Object jsonObj = Json.fromJson(jsonString);
        return RuntimeMethods.coerce(jsonObj, targetClass);
    }

    return null;
}

Checklist

- [X] Modify `src/main/java/com/example/helloworld/ManifoldJsonMessageConverter.java` ✓ https://github.com/dakotahNorth/HelloWorldSpringCloudStream/commit/25d5d6c779397e7bbb2508a614ccf0c6d10055f3 [Edit](https://github.com/dakotahNorth/HelloWorldSpringCloudStream/edit/sweep/return_null_if_exception_is_thrown_conve/src/main/java/com/example/helloworld/ManifoldJsonMessageConverter.java)

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https://github.com/dakotahNorth/HelloWorldSpringCloudStream/blob/d1face4a1d08a5a43201859dc3bd6ddc0a2aa379/src/main/java/com/example/helloworld/ManifoldJsonMessageConverter.java#L1-L33 https://github.com/dakotahNorth/HelloWorldSpringCloudStream/blob/d1face4a1d08a5a43201859dc3bd6ddc0a2aa379/src/main/java/com/example/helloworld/ManifoldCustomConverterConfig.java#L1-L19

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• [X] Modify src/main/java/com/example/helloworld/ManifoldJsonMessageConverter.java ✓ https://github.com/dakotahNorth/HelloWorldSpringCloudStream/commit/25d5d6c779397e7bbb2508a614ccf0c6d10055f3 Edit

  Modify src/main/java/com/example/helloworld/ManifoldJsonMessageConverter.java with contents: In the convertFromInternal method, make the following changes:

Wrap the existing JSON conversion logic inside a try block:

try {
    String jsonString = new String((byte[]) payload);
    Object jsonObj = Json.fromJson(jsonString); 
    return RuntimeMethods.coerce(jsonObj, targetClass);
} 

After the try block, add a catch block to catch any exceptions:

catch (Exception e) {
    // Log the exception for debugging purposes
    // Return null to allow other converters to be tried
    return null;
}

The updated method should look like:

@Override
protected Object convertFromInternal(Message<?> message, @NotNull Class<?> targetClass, Object conversionHint) {

    Object payload = message.getPayload();

    if (payload instanceof byte[]) {
        try {
            String jsonString = new String((byte[]) payload);
            Object jsonObj = Json.fromJson(jsonString);
            return RuntimeMethods.coerce(jsonObj, targetClass); 
        }
        catch (Exception e) {
            // Log the exception for debugging purposes 
            // Return null to allow other converters to be tried
            return null;
        }
    }

    return null;
}

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I have finished reviewing the code for completeness. I did not find errors for sweep/return_null_if_exception_is_thrown_conve.

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