Provide an artifact with only the model types

[tomasbjerre]

Use case

I am currently depending on au.com.dius.pact.core:model to get the types. To be exact, I currently use these (but will likely need others in the future):

import au.com.dius.pact.core.model.Consumer;
import au.com.dius.pact.core.model.IRequest;
import au.com.dius.pact.core.model.IResponse;
import au.com.dius.pact.core.model.Interaction;
import au.com.dius.pact.core.model.OptionalBody;
import au.com.dius.pact.core.model.OptionalBody.State;
import au.com.dius.pact.core.model.PactSpecVersion;
import au.com.dius.pact.core.model.Provider;
import au.com.dius.pact.core.model.ProviderState;
import au.com.dius.pact.core.model.SynchronousRequestResponse;
import au.com.dius.pact.core.model.V4Interaction.SynchronousHttp;
import au.com.dius.pact.core.model.V4Pact;

I need to generate valid v4 JSON and that is why I need these types.

Problem

The au.com.dius.pact.core:model artifact adds a lot of transitives to the classpath. And that results in problems like ClassNotFoundException, MethodNotFoundException, ... classic classpath issues.

I found the JsonSchema spec but I need Java code and the only code generator I can find does not support anyOf.

|    \--- au.com.dius.pact.core:model:4.6.9
|         +--- org.jetbrains.kotlin:kotlin-bom:1.8.22
|         |    +--- org.jetbrains.kotlin:kotlin-stdlib:1.8.22 (c)
|         |    +--- org.jetbrains.kotlin:kotlin-reflect:1.8.22 (c)
|         |    +--- org.jetbrains.kotlin:kotlin-stdlib-common:1.8.22 (c)
|         |    +--- org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.8.22 (c)
|         |    \--- org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.8.22 (c)
|         +--- org.jetbrains.kotlin:kotlin-stdlib:1.8.22
|         |    +--- org.jetbrains.kotlin:kotlin-stdlib-common:1.8.22
|         |    \--- org.jetbrains:annotations:13.0 -> 23.0.0
|         +--- org.jetbrains.kotlin:kotlin-reflect:1.8.22
|         |    \--- org.jetbrains.kotlin:kotlin-stdlib:1.8.22 (*)
|         +--- org.apache.commons:commons-lang3 -> 3.12.0
|         +--- org.apache.commons:commons-collections4 -> 4.4
|         +--- commons-codec:commons-codec -> 1.15
|         +--- org.slf4j:slf4j-api -> 2.0.9
|         +--- com.github.mifmif:generex:1.0.2
|         |    \--- dk.brics.automaton:automaton:1.11-8
|         +--- javax.mail:mail:1.5.0-b01
|         |    \--- javax.activation:activation:1.1
|         +--- io.ktor:ktor-http-jvm -> 2.3.8
|         |    +--- org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.8.22
|         |    |    \--- org.jetbrains.kotlin:kotlin-stdlib:1.8.22 (*)
|         |    +--- org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.8.22
|         |    |    +--- org.jetbrains.kotlin:kotlin-stdlib:1.8.22 (*)
|         |    |    \--- org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.8.22 (*)
|         |    +--- org.jetbrains.kotlinx:kotlinx-coroutines-jdk8:1.7.1
|         |    |    +--- org.jetbrains.kotlinx:kotlinx-coroutines-core:1.7.1
|         |    |    |    \--- org.jetbrains.kotlinx:kotlinx-coroutines-core-jvm:1.7.1
|         |    |    |         +--- org.jetbrains:annotations:23.0.0
|         |    |    |         +--- org.jetbrains.kotlinx:kotlinx-coroutines-bom:1.7.1
|         |    |    |         |    +--- org.jetbrains.kotlinx:kotlinx-coroutines-core-jvm:1.7.1 (c)
|         |    |    |         |    +--- org.jetbrains.kotlinx:kotlinx-coroutines-core:1.7.1 (c)
|         |    |    |         |    \--- org.jetbrains.kotlinx:kotlinx-coroutines-jdk8:1.7.1 (c)
|         |    |    |         \--- org.jetbrains.kotlin:kotlin-stdlib-common:1.8.20 -> 1.8.22
|         |    |    \--- org.jetbrains.kotlinx:kotlinx-coroutines-bom:1.7.1 (*)
|         |    +--- org.slf4j:slf4j-api:1.7.36 -> 2.0.9
|         |    +--- org.jetbrains.kotlinx:kotlinx-coroutines-core:1.7.1 (*)
|         |    +--- io.ktor:ktor-utils:2.3.8
|         |    |    \--- io.ktor:ktor-utils-jvm:2.3.8
|         |    |         +--- org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.8.22 (*)
|         |    |         +--- org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.8.22 (*)
|         |    |         +--- org.jetbrains.kotlinx:kotlinx-coroutines-jdk8:1.7.1 (*)
|         |    |         +--- org.slf4j:slf4j-api:1.7.36 -> 2.0.9
|         |    |         +--- org.jetbrains.kotlinx:kotlinx-coroutines-core:1.7.1 (*)
|         |    |         +--- io.ktor:ktor-io:2.3.8
|         |    |         |    \--- io.ktor:ktor-io-jvm:2.3.8
|         |    |         |         +--- org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.8.22 (*)
|         |    |         |         +--- org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.8.22 (*)
|         |    |         |         +--- org.jetbrains.kotlinx:kotlinx-coroutines-jdk8:1.7.1 (*)
|         |    |         |         +--- org.slf4j:slf4j-api:1.7.36 -> 2.0.9
|         |    |         |         +--- org.jetbrains.kotlinx:kotlinx-coroutines-core:1.7.1 (*)
|         |    |         |         \--- org.jetbrains.kotlin:kotlin-stdlib-common:1.8.22
|         |    |         \--- org.jetbrains.kotlin:kotlin-stdlib-common:1.8.22
|         |    \--- org.jetbrains.kotlin:kotlin-stdlib-common:1.8.22
|         +--- commons-beanutils:commons-beanutils:1.9.4
|         |    +--- commons-logging:commons-logging:1.2
|         |    \--- commons-collections:commons-collections:3.2.2
|         +--- au.com.dius.pact.core:support:4.6.9
|         |    +--- org.jetbrains.kotlin:kotlin-bom:1.8.22 (*)
|         |    +--- org.jetbrains.kotlin:kotlin-stdlib:1.8.22 (*)
|         |    +--- org.jetbrains.kotlin:kotlin-reflect:1.8.22 (*)
|         |    +--- org.apache.commons:commons-text -> 1.10.0
|         |    |    \--- org.apache.commons:commons-lang3:3.12.0
|         |    +--- commons-codec:commons-codec -> 1.15
|         |    +--- io.github.oshai:kotlin-logging-jvm -> 5.1.4
|         |    |    +--- org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.8.22 (*)
|         |    |    \--- org.jetbrains.kotlin:kotlin-stdlib-common:1.8.22
|         |    +--- org.apache.httpcomponents.client5:httpclient5 -> 5.2.1
|         |    |    +--- org.apache.httpcomponents.core5:httpcore5:5.2
|         |    |    +--- org.apache.httpcomponents.core5:httpcore5-h2:5.2
|         |    |    |    \--- org.apache.httpcomponents.core5:httpcore5:5.2
|         |    |    \--- org.slf4j:slf4j-api:1.7.36 -> 2.0.9
|         |    +--- org.apache.httpcomponents.client5:httpclient5-fluent -> 5.2.1
|         |    |    +--- org.apache.httpcomponents.client5:httpclient5:5.2.1 (*)
|         |    |    \--- org.slf4j:slf4j-api:1.7.36 -> 2.0.9
|         |    +--- org.jetbrains.kotlin:kotlin-stdlib -> 1.8.22 (c)
|         |    +--- org.apache.commons:commons-lang3:3.12.0 (c)
|         |    +--- org.apache.commons:commons-text:1.10.0 (c)
|         |    +--- org.apache.commons:commons-collections4:4.4 (c)
|         |    +--- org.apache.tika:tika-core:2.9.1 (c)
|         |    +--- org.slf4j:slf4j-api:1.7.36 -> 2.0.9 (c)
|         |    +--- io.ktor:ktor-http-jvm:2.3.8 (c)
|         |    +--- commons-codec:commons-codec:1.15 (c)
|         |    +--- io.github.oshai:kotlin-logging-jvm:5.1.4 (c)
|         |    +--- org.apache.httpcomponents.client5:httpclient5:5.2.1 (c)
|         |    +--- org.apache.httpcomponents.client5:httpclient5-fluent:5.2.1 (c)
|         |    \--- com.google.guava:guava:31.1-jre (c)
|         +--- au.com.dius.pact.core:pactbroker:4.6.9
|         |    +--- org.jetbrains.kotlin:kotlin-bom:1.8.22 (*)
|         |    +--- org.jetbrains.kotlin:kotlin-stdlib:1.8.22 (*)
|         |    +--- org.jetbrains.kotlin:kotlin-reflect:1.8.22 (*)
|         |    +--- org.apache.commons:commons-lang3 -> 3.12.0
|         |    +--- com.google.guava:guava -> 31.1-jre
|         |    |    +--- com.google.guava:failureaccess:1.0.1
|         |    |    +--- com.google.guava:listenablefuture:9999.0-empty-to-avoid-conflict-with-guava
|         |    |    +--- com.google.code.findbugs:jsr305:3.0.2
|         |    |    +--- org.checkerframework:checker-qual:3.12.0
|         |    |    +--- com.google.errorprone:error_prone_annotations:2.11.0
|         |    |    \--- com.google.j2objc:j2objc-annotations:1.3
|         |    +--- org.slf4j:slf4j-api -> 2.0.9
|         |    +--- au.com.dius.pact.core:support:4.6.9 (*)
|         |    +--- io.github.oshai:kotlin-logging-jvm -> 5.1.4 (*)
|         |    +--- org.apache.httpcomponents.client5:httpclient5 -> 5.2.1 (*)
|         |    +--- org.jetbrains.kotlin:kotlin-stdlib -> 1.8.22 (c)
|         |    +--- org.apache.commons:commons-lang3:3.12.0 (c)
|         |    +--- org.apache.commons:commons-text:1.10.0 (c)
|         |    +--- org.apache.commons:commons-collections4:4.4 (c)
|         |    +--- org.apache.tika:tika-core:2.9.1 (c)
|         |    +--- com.google.guava:guava:31.1-jre (c)
|         |    +--- org.slf4j:slf4j-api:1.7.36 -> 2.0.9 (c)
|         |    +--- io.ktor:ktor-http-jvm:2.3.8 (c)
|         |    +--- commons-codec:commons-codec:1.15 (c)
|         |    +--- io.github.oshai:kotlin-logging-jvm:5.1.4 (c)
|         |    +--- org.apache.httpcomponents.client5:httpclient5:5.2.1 (c)
|         |    \--- org.apache.httpcomponents.client5:httpclient5-fluent:5.2.1 (c)
|         +--- org.apache.tika:tika-core -> 2.9.1
|         |    +--- org.slf4j:slf4j-api:2.0.9
|         |    \--- commons-io:commons-io:2.14.0
|         +--- org.jetbrains.kotlin:kotlin-stdlib -> 1.8.22 (c)
|         +--- org.apache.commons:commons-lang3:3.12.0 (c)
|         +--- org.apache.commons:commons-collections4:4.4 (c)
|         +--- org.apache.tika:tika-core:2.9.1 (c)
|         +--- org.slf4j:slf4j-api:1.7.36 -> 2.0.9 (c)
|         +--- io.ktor:ktor-http-jvm:2.3.8 (c)
|         +--- commons-codec:commons-codec:1.15 (c)
|         +--- org.apache.commons:commons-text:1.10.0 (c)
|         +--- io.github.oshai:kotlin-logging-jvm:5.1.4 (c)
|         +--- org.apache.httpcomponents.client5:httpclient5:5.2.1 (c)
|         +--- org.apache.httpcomponents.client5:httpclient5-fluent:5.2.1 (c)
|         \--- com.google.guava:guava:31.1-jre (c)

Proposed solution

Move the types into its own artifact. Would be nice if it can have zero dependencies, not even Kotlin, but as few as possible would help.

Also the JSON serialization would be nice to have separated. I was a bit surprised that the body is not "content": "{ \"a\": \"b\" }" but it is instead "content": { "a": "b" }, such logic would be nice to have separated.

Workaround

I might just package a fat jar from model and relocate stuff so that it has zero dependencies.