InfluxDB Exception : org.influxdb.InfluxDBException: {"code":"unauthorized","message":"Unauthorized"}

I also faced the same issue when I was trying to write the data in influxdb. But I have fixed this issue by update the library. I believe you are using influxdb 2.x version not 1.x. In this case, please use the following dependency.

instead of

<dependency>
        <groupId>org.influxdb</groupId>
        <artifactId>influxdb-java</artifactId>
        <version>${influxdb.version}</version>
    </dependency>

use this

   <dependency>
        <groupId>com.influxdb</groupId>
        <artifactId>influxdb-client-java</artifactId>
        <version>4.0.0</version>
    </dependency>

with this library, you can perform the write and query operations like below. If you observe the below code, you can clearly see you need to supply url, token, org and bucket instead of username and password.

package com.influx.writer;

import java.time.Instant;
import java.util.List;

import com.influxdb.annotations.Column;
import com.influxdb.annotations.Measurement;
import com.influxdb.client.InfluxDBClient;
import com.influxdb.client.InfluxDBClientFactory;
import com.influxdb.client.QueryApi;
import com.influxdb.client.WriteApiBlocking;
import com.influxdb.client.domain.WritePrecision;
import com.influxdb.client.write.Point;
import com.influxdb.query.FluxRecord;
import com.influxdb.query.FluxTable;

public class InfluxDB2Example {

    private static char[] token = "my-token".toCharArray();
    private static String org = "my-org";
    private static String bucket = "my-bucket";

    public static void main(final String[] args) {

        InfluxDBClient influxDBClient = InfluxDBClientFactory.create("http://localhost:8086", token, org, bucket);

        //
        // Write data
        //
        WriteApiBlocking writeApi = influxDBClient.getWriteApiBlocking();

        //
        // Write by Data Point
        //
        Point point = Point.measurement("temperature")
                .addTag("location", "west")
                .addField("value", 55D)
                .time(Instant.now().toEpochMilli(), WritePrecision.MS);

        writeApi.writePoint(point);

        //
        // Write by LineProtocol
        //
        writeApi.writeRecord(WritePrecision.NS, "temperature,location=north value=60.0");

        //
        // Write by POJO
        //
        Temperature temperature = new Temperature();
        temperature.location = "south";
        temperature.value = 62D;
        temperature.time = Instant.now();

        writeApi.writeMeasurement( WritePrecision.NS, temperature);

        //
        // Query data
        //
        String flux = "from(bucket:\"my-bucket\") |> range(start: 0)";

        QueryApi queryApi = influxDBClient.getQueryApi();

        List<FluxTable> tables = queryApi.query(flux);
        for (FluxTable fluxTable : tables) {
            List<FluxRecord> records = fluxTable.getRecords();
            for (FluxRecord fluxRecord : records) {
                System.out.println(fluxRecord.getTime() + ": " + fluxRecord.getValueByKey("_value"));
            }
        }

        influxDBClient.close();
    }

    @Measurement(name = "temperature")
    private static class Temperature {

        @Column(tag = true)
        String location;

        @Column
        Double value;

        @Column(timestamp = true)
        Instant time;
    }
}