throwing exception inside the java 8 stream foreach

Question

I am using java 8 stream and I can not throw the exceptions inside the foreach of stream.

 stream.forEach(m -> {
        try {

            if (isInitial) {
                isInitial = false;
                String outputName = new SimpleDateFormat(Constants.HMDBConstants.HMDB_SDF_FILE_NAME).format(new Date());
                if (location.endsWith(Constants.LOCATION_SEPARATOR)) {
                    savedPath = location + outputName;
                } else {
                    savedPath = location + Constants.LOCATION_SEPARATOR + outputName;
                }
                File output = new File(savedPath);
                FileWriter fileWriter = null;
                fileWriter = new FileWriter(output);
                writer = new SDFWriter(fileWriter);
            }

            writer.write(m);

        } catch (IOException e) {
            throw new ChemIDException(e.getMessage(),e);
        }

    });

and this is my exception class

public class ChemIDException extends Exception {
public ChemIDException(String message, Exception e) {
    super(message, e);
}

}

I am using loggers to log the errors in upper level. So I want to throw the exception to top. Thanks

Answer 1

Try extending RuntimeException instead. The method that is created to feed to the foreach does not have that type as throwable, so you need something that is runtime throwable.

WARNING: THIS IS PROBABLY NOT A VERY GOOD IDEA

But it will probably work.