Why Akka-Http still uses older Akka-Actor?

Question

I have added the latest akka-http to my project but that includes the very old 2.4.19 version on akka-actor. Hence I also added akka-actor version 2.5.4 to the dependency. However, that results into following error:-

Detected java.lang.NoSuchMethodError error, which MAY be caused by incompatible Akka versions on the classpath.

My maven config is like below:-

<dependencies>
    <dependency>
        <groupId>com.typesafe.akka</groupId>
        <artifactId>akka-http_2.11</artifactId>
        <version>10.0.9</version>
    </dependency>
    <dependency>
        <groupId>com.typesafe.akka</groupId>
        <artifactId>akka-actor_2.11</artifactId>
        <version>2.5.4</version>
    </dependency>
</dependencies>

What am I missing? Is there any version of akka-http which uses the latest akka-actor?

Update: Added dependency graph

Answer 1

From the Compatibility Guidelines page in the documentation:

Akka HTTP 10.0.x is (binary) compatible with both Akka 2.4.x as well as Akka 2.5.x, however in order to facilitate this the build (and thus released artifacts) depend on the 2.4 series. Depending on how you structure your dependencies, you may encounter a situation where you depended on akka-actor of the 2.5 series, and you depend on akka-http from the 10.0 series, which in turn would transitively pull in the akka-streams dependency in version 2.4 which breaks the binary compatibility requirement that all Akka modules must be of the same version, so the akka-streams dependency MUST be the same version as akka-actor (so the exact version from the 2.5 series).

In order to resolve this dependency issue, you must depend on akka-streams explicitly, and make it the same version as the rest of your Akka environment....

Change your Maven dependencies to the following:

<dependencies>
    <dependency>
        <groupId>com.typesafe.akka</groupId>
        <artifactId>akka-actor_2.11</artifactId>
        <version>2.5.4</version>
    </dependency>
    <!-- Explicitly depend on akka-streams in same version as akka-actor -->
    <dependency>
        <groupId>com.typesafe.akka</groupId>
        <artifactId>akka-stream_2.11</artifactId>
        <version>2.5.4</version>
    </dependency>
    <dependency>
        <groupId>com.typesafe.akka</groupId>
        <artifactId>akka-http_2.11</artifactId>
        <version>10.0.9</version>
    </dependency>
</dependencies>