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Is there a bug in the new Spring JSON reader or am I doing something wrong?


Is there a bug in the new Spring JSON reader or am I doing something wrong?

By : Sheila Wood
Date : November 26 2020, 01:01 AM
Hope that helps The JsonItemReader is designed to read an array of JSON objects (See its Javadoc). According to http://www.json.org, a JSON object is defined as follows:
code :


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Json Array reader file with spring batch

Json Array reader file with spring batch


By : mark ivdx
Date : March 29 2020, 07:55 AM
may help you . Assuming you want to model the StaxEventItemReader in that you want to read each item of the JSON array as an item in Spring Batch, here's what I'd recommend:
RecordSeparatorPolicy - You'll need to implement your own RecordSepartorPolicy that indicates if you've finished reading in the full item or not. You can also use the RecordSeparatoerPolicy#postProcess to cleanup the beginning and ending [] you'll need to deal with as well as the comma delimiters.
code :
public class JsonLineTokenizer implements LineTokenizer {

    @Override
    public FieldSet tokenize(String line) {
        List<String> tokens = new ArrayList<>();

        try {
            HashMap<String,Object> result =
                    new ObjectMapper().readValue(line, HashMap.class);

            tokens.add((String) result.get("field1"));
            tokens.add((String) result.get("field2")));

        } catch (IOException e) {
            throw new RuntimeException("Unable to parse json: " + line);
        }

        return new DefaultFieldSet(tokens.toArray(new String[0]), {"field1", "field2"});
    }
}
Am I using reader wrong or is it possible my reader has null values?

Am I using reader wrong or is it possible my reader has null values?


By : Haarmu
Date : March 29 2020, 07:55 AM
Hope this helps If your data does not contain null values then the likely problem is that you do not initialize the MANUFACTURER property to a value in the PRODUCT constructor, which means it is null when you attempt to set product.MANUFACTURER.ManufacturerName to a value.
Also note that naming classes and members in ALL CAPS is generally bad form - consider changing them to Product and Manufacturer.
How do I inject a buffered reader into a class with a file reader as its parameter using Spring boot?

How do I inject a buffered reader into a class with a file reader as its parameter using Spring boot?


By : Okum
Date : March 29 2020, 07:55 AM
hope this fix your issue If you want to mock the class which have the below line inside a method.
code :
BufferedReader reader = new BufferedReader(new FileReader("somePath"));
@MockBean
private TestClass testClass;

when(testClass.readFile()).thenReturn(content);
    @Bean
BufferedReader reader(@Value("${filename}") String fileName) throws FileNotFoundException{

    return new BufferedReader(new FileReader(fileName));
}
Spring Batch - Remove Certain Types of Lines From Reader & JSON Parsing

Spring Batch - Remove Certain Types of Lines From Reader & JSON Parsing


By : Rana Sohail
Date : March 29 2020, 07:55 AM
help you fix your problem What I'm attempting to do here is only read/parse the JSON portion of a file that is structured like this: , Extend the FlatFileItemReader and call
code :
setRecordSeparatorPolicy(yourPolicyTOSkipLines);
Spring batch: chaining reader.processor, reader for the same initial data?

Spring batch: chaining reader.processor, reader for the same initial data?


By : MathisS
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , Instead of trying to do multiple reads you should consider chaining item processors after a single read before the final write.
The reason for this suggestion is chaining item processors allows you to take input, act upon it, transform it, and pass it along to the next processor in the chain.
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