[SOLVED] Gradle Init Java Library is failing to resolve dependencies for lib "target"

Gradle Init Java Library is failing to resolve dependencies for lib "target"

I have Java 17 on my machine and Gradle 8.3.

I create a new Java Library project using:

gradle init --type java-library

I follow the prompts and it produces a project with a directory structure that looks like:

myapp/
  lib/
    src/main/java/<some-generated-java-code-here>
    build.gradle
  gradle.properties
  settings.gradle

I run gradle wrapper, and then I go into build.gradle and add a few dependencies, making it look like:

plugins {
    id 'java-library'
}

group 'me.myself'
version '24.0.2'

repositories {
    mavenCentral()
}

dependencies {

    api 'org.apache.commons:commons-math3:3.6.1'

    implementation (
            'com.google.guava:guava:32.1.1-jre'

            ,'org.keycloak:keycloak-core'
            ,'org.keycloak:keycloak-server-spi'
            ,'org.keycloak:keycloak-server-spi-private'
            ,'org.keycloak:keycloak-services'
            ,'org.jboss.logging:jboss-logging'
            ,'org.jboss.spec.javax.ws.rs:jboss-jaxrs-api_2.1_spec'
    )
}

java {
    toolchain {
        languageVersion = JavaLanguageVersion.of(17)
    }
}

jar {
    archiveBaseName = 'myapp-keycloak-customizer'
    archiveVersion = '24.0.2'
}

tasks.withType(JavaCompile) {
    options.encoding = 'UTF-8'
}

Inside IntelliJ I go to build the project, just to pull in/resolve the new dependencies, and I get the following error:

:lib:main: Could not find org.keycloak:keycloak-core:.
Required by:
    project :lib

I have verified that org.keycloak:keycloak-core is a valid entry for Maven Central. Also, as you'll see below, it can't even find JBoss Logging, so its not a Maven or Keycloak dependency issue. I can also verify I have full wifi and no networking issues.

So from the terminal I run ./gradlew build --debug and I get a ton of output, the interesting portion being:

[ERROR] [o.g.i.b.BuildExceptionReporter] FAILURE: Build failed with an exception.
[ERROR] [o.g.i.b.BuildExceptionReporter] 
[ERROR] [o.g.i.b.BuildExceptionReporter] * What went wrong:
[ERROR] [o.g.i.b.BuildExceptionReporter] Execution failed for task ':lib:compileJava'.
[ERROR] [o.g.i.b.BuildExceptionReporter] > Could not resolve all files for configuration ':lib:compileClasspath'.
[ERROR] [o.g.i.b.BuildExceptionReporter]    > Could not find org.keycloak:keycloak-core:.
[ERROR] [o.g.i.b.BuildExceptionReporter]      Required by:
[ERROR] [o.g.i.b.BuildExceptionReporter]          project :lib
[ERROR] [o.g.i.b.BuildExceptionReporter]    > Could not find org.keycloak:keycloak-server-spi:.
[ERROR] [o.g.i.b.BuildExceptionReporter]      Required by:
[ERROR] [o.g.i.b.BuildExceptionReporter]          project :lib
[ERROR] [o.g.i.b.BuildExceptionReporter]    > Could not find org.keycloak:keycloak-server-spi-private:.
[ERROR] [o.g.i.b.BuildExceptionReporter]      Required by:
[ERROR] [o.g.i.b.BuildExceptionReporter]          project :lib
[ERROR] [o.g.i.b.BuildExceptionReporter]    > Could not find org.keycloak:keycloak-services:.
[ERROR] [o.g.i.b.BuildExceptionReporter]      Required by:
[ERROR] [o.g.i.b.BuildExceptionReporter]          project :lib
[ERROR] [o.g.i.b.BuildExceptionReporter]    > Could not find org.jboss.logging:jboss-logging:.
[ERROR] [o.g.i.b.BuildExceptionReporter]      Required by:
[ERROR] [o.g.i.b.BuildExceptionReporter]          project :lib
[ERROR] [o.g.i.b.BuildExceptionReporter]    > Could not find org.jboss.spec.javax.ws.rs:jboss-jaxrs-api_2.1_spec:.
[ERROR] [o.g.i.b.BuildExceptionReporter]      Required by:
[ERROR] [o.g.i.b.BuildExceptionReporter]          project :lib

Its almost as if its looking in the lib directory for my dependencies instead of pulling them from Maven Central maybe? Can anyone spot where I'm going awry and help me get this thing building please?

Solution

You need to call implementation for each library, and supply the version each time.

dependencies {
    def keycloakVersion = '24.0.3'
    implementation 'com.google.guava:guava:32.1.1-jre'
    implementation "org.keycloak:keycloak-core:$keycloakVersion"
    implementation "org.keycloak:keycloak-server-spi:$keycloakVersion"
    //...
}

We're using some Groovy features there, namely defining a variable and string interpolation.