Kotlin Support

[lucasleon2107]

I using Spring Boot (3.0.2) with JDK 17, Kotlin (1.8.20) and the latest version of Redis OM (0.8.2). I configured the annotation processor using kapt. Here's the snippet:

<plugin>
                <groupId>org.jetbrains.kotlin</groupId>
                <artifactId>kotlin-maven-plugin</artifactId>
                <version>${kotlin.version}</version>
                <extensions>true</extensions>
                <executions>
                    <execution>
                        <id>kapt</id>
                        <configuration>
                            <sourceDirs>
                                <sourceDir>src/main/kotlin</sourceDir>
                            </sourceDirs>
                            <annotationProcessorPaths>
                                <annotationProcessorPath>
                                    <groupId>com.redis.om</groupId>
                                    <artifactId>redis-om-spring</artifactId>
                                    <version>0.8.0</version>
                                </annotationProcessorPath>
                            </annotationProcessorPaths>
                        </configuration>
                    </execution>
                </executions>
                <configuration>
                    <args>
                        <arg>-Xjsr305=strict</arg>
                    </args>
                    <compilerPlugins>
                        <plugin>spring</plugin>
                    </compilerPlugins>
                </configuration>
                <dependencies>
                    <dependency>
                        <groupId>org.jetbrains.kotlin</groupId>
                        <artifactId>kotlin-maven-allopen</artifactId>
                        <version>${kotlin.version}</version>
                    </dependency>
                </dependencies>
            </plugin>

This is the class that is being generated:

public final class UserInfoHash$ {
  public static MetamodelField<UserInfoHash, String> _KEY;

  static {
    try {
      _KEY = new MetamodelField<UserInfoHash, String>("__key", String.class, true);
    } catch(NoSuchFieldException | SecurityException e) {
      System.err.println(e.getMessage());
    }
  }
}

But I'm getting the following error:
exception java.lang.NoSuchFieldException is never thrown in body of corresponding try statement

[bsbodden]

Lucas, can you post the code for the UserInfoHash - I think I see what the problem is. I'm assuming that there will be other fields besides the id. But please post the code or similar code so that I can confirm.

[lucasleon2107]

Sorry, I'm not near my computer right now, but it's a User data class with the @Document annotation, a String @Id that I'm setting myself, not autogenerated. Name and last name with @Searchable and a code String field with @Indexed. I hope that helps

[lucasleon2107]

This is the class

@Document
data class UserInfoHash(
    @Id
    val accountId: String = "",
    @Searchable
    val firstName: String? = null,
    @Searchable
    val lastName: String? = null,
    @Indexed
    val code: String? = null
)

[lucasleon2107]

@bsbodden any updates?

[bsbodden]

Not yet, there hasn't been much testing for Kotlin so I'm in the process of building some tests.

[lucasleon2107]

@bsbodden is there a way that I can make a query by multiple optional query params? I want to filter by name or last name and maybe other additional fields that I could add that will come from the controller

[lucasleon2107]

@bsbodden I assume I have to use Predicates. Can you show me an example of how to achieve that?

[bsbodden]

@bsbodden is there a way that I can make a query by multiple optional query params? I want to filter by name or last name and maybe other additional fields that I could add that will come from the controller

Lucas, stop by our discord server http://discord.gg/redis and I can help you there. On the issue on this page, it looks like we might need to use the "all open plugin" and make modifications to OM to support Kotlin https://kotlinlang.org/docs/all-open-plugin.html#maven

So in the meantime, unfortunately, I would assume that there is no Kotlin support until announced. I'm building a comprehensive test suite to validate the Kotlin support and I would expect it out in 0.8.4 or so.

[bsbodden]

@lucasleon2107 I think I have a running example working now. It was just a matter of getting kapt to behave correctly. I will post a link to a sample repo later today.

[bsbodden]

@lucasleon2107 see https://github.com/redis-developer/redis-om-spring-kotlin-skeleton-app

[lucasleon2107]

@bsbodden This great, thanks! I'll try it later today. I have a question. Do you have an example of how to make queries with the Java Predicate class? I did some tests, but they currently didn't work for me

[bsbodden]

There are some examples in that repo.