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https://issues.apache.org/jira/browse/AVRO-1099?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13282011#comment-13282011
]
John Jenkins commented on AVRO-1099:
------------------------------------
Sure. I am using the "avro-1.6.3.jar" and the "jackson-all-1.9.7.jar" files.
Here is some example code all in Java:
{code}
package test;
import org.apache.avro.Schema;
import org.apache.avro.Schema.Parser;
import org.apache.avro.generic.GenericContainer;
import org.apache.avro.generic.GenericDatumReader;
import org.apache.avro.io.Decoder;
import org.apache.avro.io.DecoderFactory;
/**
* An example use of Avro.
*
* @author John Jenkins
*/
public class AvroIntTest {
/**
* This is a sample Avro schema for a double.
*/
private static final String DEFINITION =
"{" +
"\"namespace\":\"test\"," +
"\"type\":\"record\"," +
"\"name\":\"DoubleTest\"," +
"\"fields\":[" +
"{" +
"\"type\":\"double\"," +
"\"name\":\"DoubleValue\"" +
"}" +
"]" +
"}";
/**
* This is a sample record that matches the above schema.
*/
private static final String EXAMPLE_RECORD =
"{" +
"\"DoubleValue\":0" + // This will fail.
// "\"DoubleValue\":0.0" + // This will succeed.
"}";
/**
* This is the driver of this example.
*
* @param args None accepted.
*
* @throws Exception Never actually thrown, this is stashed here because
* this is an example.
*/
public static void main(String[] args) throws Exception {
// Compile the schema.
Schema schema = (new Parser()).parse(DEFINITION);
// Create the reader to read the data that has been decoded.
GenericDatumReader<GenericContainer> reader =
new GenericDatumReader<GenericContainer>(schema);
// Create the decoder to decode our sample record.
Decoder decoder =
(new DecoderFactory()).jsonDecoder(schema,
EXAMPLE_RECORD);
// Retrieve the container.
GenericContainer avroContainer = reader.read(null, decoder);
}
}
{code}
We are trying out Avro to see if it will work for our system, so I am very new
to it. If there is a more appropriate way to handle this, please let me know.
> Int / Float cannot be decoded
> -----------------------------
>
> Key: AVRO-1099
> URL: https://issues.apache.org/jira/browse/AVRO-1099
> Project: Avro
> Issue Type: Bug
> Components: java
> Affects Versions: 1.6.3
> Environment: Mac OS X 10.7.3. Eclipse IDE for Java EE Developers
> 1.4.2.20120213
> Reporter: John Jenkins
> Labels: patch
>
> I am currently using a JSON library that is encoding 0 for a double to "0"
> instead of "0.0", without the quotes. First, I feel that "0" is a perfectly
> valid value for 0 as a double. But, I tried to code around it by changing the
> "type" of the field to "["double", "int"]", without the quotes and it is
> giving me this error:
> Exception in thread "main" org.apache.avro.AvroTypeException: Expected
> start-union. Got VALUE_NUMBER_INT
> at org.apache.avro.io.JsonDecoder.error(JsonDecoder.java:697)
> at org.apache.avro.io.JsonDecoder.readIndex(JsonDecoder.java:441)
> at
> org.apache.avro.io.ResolvingDecoder.doAction(ResolvingDecoder.java:229)
> at org.apache.avro.io.parsing.Parser.advance(Parser.java:88)
> at
> org.apache.avro.io.ResolvingDecoder.readIndex(ResolvingDecoder.java:206)
> at
> org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:148)
> at
> org.apache.avro.generic.GenericDatumReader.readRecord(GenericDatumReader.java:173)
> at
> org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:144)
> at
> org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:135)
> If I change it to just "int", then it works for a few records until it
> reaches a double.
> Thank you,
> John
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