如何在Mule中扩展AbstractMessageTransformer的Java类中处理FileNotFoundException？

Question

I am using a custom transformer in mule and for that I am writing custom java code which extends AbstractMessageTransformer.

I am facing a issue since in the custom java class since I need to handle FileNotFoundException and it says FileNotFoundException is not compatible with AbstractMessageTransformer.

Is there any way I can handle FileNotFoundException in custom java class that extends AbstractMessageTransformer ??

Answer 1

If what you want to re-throw the FileNotFoundException within a class extending an AbstractMessageTransformer , then you should probably wrap that exception into a TransformerException , the one thrown by the doTransform method

Your method will look like this

    try{
        //Your custom transformation
    } catch(FileNotFoundException e){
        Message msg = CoreMessages.transformFailedBeforeFilter();
        throw new TransformerException(msg,this, e);
    }

Answer 2

public class MessageAttachmentTransformer extends AbstractMessageTransformer
{private List<String> filename; // file to attach
    @SuppressWarnings("deprecation")
    public Object transformMessage(MuleMessage message, String outputEncoding) throws TransformerException {
        if (filename.isEmpty() || filename==null || filename.size()==0) **//filename is a list contains list of file path as mule attachment**
        {**//If file for attachment is not there**
            **//Here I want to place FileNotFoundException**
            return message;} else
        { // do other thing} return message;
        } 
    }
}