multiply, divide on Unit does not return same Unit

[samodadela]

Is this behavior correct?

Unit<Speed> u = METRE_PER_SECOND;
u.mulitply(0.001).divide(0.001) != u?

Test...

    private static final JsonMapper UOM_JSON_MAPPER = JsonMapper.builder()
                                                                .addModule(new UnitJacksonModule())
                                                                .build();

    public static String serialize(Object objectToSerialize) throws JsonProcessingException {

        return UOM_JSON_MAPPER.writeValueAsString(objectToSerialize);
    }

    @Test
    void mulTest() throws JsonProcessingException {
        Unit<Speed> one = METRE_PER_SECOND;
        System.out.println(serialize((one)));
        Unit<Speed> mul = one.multiply(0.001);
        System.out.println(serialize((mul)));
        Unit<Speed> div = mul.divide(0.001);
        System.out.println(serialize((div)));
    }

Output is:

"m/s"
"(m/s).0"
"((m/s).0).1000"

I'd expect to get back m/s. Also what does (m/s).0 mean?

[keilw]

I assume you're using Indriya, the RI, which version?
Because the API does not do these actual operations, I may transfer the issue into https://github.com/unitsofmeasurement/indriya but please could you tell us the exact implementation version and if any other libraries (e.g. uom-jackson or something older) did you get UnitJacksonModule from? Also the versions of those libraries would be good.

[samodadela]

Yes, I'm using Indiriya. Does this help?

        <!-- Unit of Measurement -->
        <indriya.version>2.0.4</indriya.version>  <!-- required by uom-lib-jackson 2.0.1 (06.05.2021) -->
        <si-units.version>2.0.1</si-units.version>
        <uom-lib.version>2.0.1</uom-lib.version> <!-- 2.1 is latest, but uom-lib-jackson is only 2.0.1 (06.05.2021) -->
        <uom-systems.version>2.0.2</uom-systems.version>
        <uom-domain.version>2.0</uom-domain.version>
        
         ...


            <!-- Unit of Measurement https://github.com/unitsofmeasurement -->
            <!-- uom RI -->
            <dependency>
                <groupId>tech.units</groupId>
                <artifactId>indriya</artifactId>
                <version>${indriya.version}</version>
            </dependency>

            <!-- si-units -->
            <dependency>
                <groupId>si.uom</groupId>
                <artifactId>si-units</artifactId>
                <version>${si-units.version}</version>
            </dependency>

            <dependency>
                <groupId>si.uom</groupId>
                <artifactId>si-quantity</artifactId>
                <version>${si-units.version}</version>
            </dependency>

            <dependency>
                <groupId>tech.uom.lib</groupId>
                <artifactId>uom-lib-common</artifactId>
                <version>${uom-lib.version}</version>
            </dependency>

            <dependency>
                <groupId>tech.uom.lib</groupId>
                <artifactId>uom-lib-jackson</artifactId>
                <version>${uom-lib.version}</version>
            </dependency>

            <dependency>
                <groupId>tech.uom.lib</groupId>
                <artifactId>uom-lib-assertj</artifactId>
                <version>${uom-lib.version}</version>
                <scope>test</scope>
            </dependency>

            <!-- uom-systems -->
            <dependency>
                <groupId>systems.uom</groupId>
                <artifactId>systems-quantity</artifactId>
                <version>${uom-systems.version}</version>
            </dependency>

            <dependency>
                <groupId>systems.uom</groupId>
                <artifactId>systems-common</artifactId>
                <version>${uom-systems.version}</version>
            </dependency>

            <dependency>
                <groupId>systems.uom</groupId>
                <artifactId>systems-unicode</artifactId>
                <version>${uom-systems.version}</version>
            </dependency>

            <dependency>
                <groupId>systems.uom</groupId>
                <artifactId>systems-ucum</artifactId>
                <version>${uom-systems.version}</version>
            </dependency>

            <!-- uom-domain -->
            <dependency>
                <groupId>tech.uom.domain</groupId>
                <artifactId>uom-energy-quantity</artifactId>
                <version>${uom-domain.version}</version>
            </dependency>

            <dependency>
                <groupId>tech.uom.domain</groupId>
                <artifactId>uom-health-api</artifactId>
                <version>${uom-domain.version}</version>
            </dependency>

            <dependency>
                <groupId>tech.uom.domain</groupId>
                <artifactId>uom-health</artifactId>
                <version>${uom-domain.version}</version>
            </dependency>

            <dependency>
                <groupId>tech.uom.domain</groupId>
                <artifactId>uom-imaging</artifactId>
                <version>${uom-domain.version}</version>
            </dependency>

At first I wanted to report under Indriya but then I saw Unit is defined in unit-api.

[keilw]

@samodadela A related ticket uom-lib#68 has been closed, did this also resolve the one here?