jresolve

Differences from other resolvers

• Open Coordinate system

maven-resolver is understandably very maven focused. Dependencies have to come from maven repositories, resolution is affected by global configuration like settings.xml

This is also true for Shrinkwrap Resolver which is built on maven-resolver.

Coursier takes configuration from a different place and supports ivy repositories in addition to maven style ones,

• Slightly better resolution algorithm

Inspiration

I tried my best to document where different concepts and parts of the code came from, but the most notable influences have been from Coursier and tools.deps.

Rough Edges

• Maven Profiles are not yet supported.
• Snapshot repositories are not yet supported.
• Version ranges are not yet supported.
• File checksums are not yet checked
• There is some information about resolved dependency trees that isn't externally introspectable.
• No built-in mechanism to track downloads of artifacts
• MavenCoordinate is the only Coordinate implementation provided
• The global cache is likely not in its most ideal state
• No CLI is provided, only a programmatic API
• No support for Fetch without using a cache
• Performance has not been profiled or optimized

Example Usage

Resolve Dependencies

var resolution = new Resolve()
        .addDependency(Dependency.mavenCentral("com.fasterxml.jackson.core:jackson-databind:2.15.2"))
        .run();

resolution.printTree();

com.fasterxml.jackson.core/jackson-databind 2.15.2
  . com.fasterxml.jackson.core/jackson-annotations 2.15.2
  . com.fasterxml.jackson.core/jackson-core 2.15.2

Fetch Dependencies

var resolution = new Resolve()
        .addDependency(Dependency.mavenCentral("com.fasterxml.jackson.core:jackson-databind:2.15.2"))
        .run();
        
var fetchResult = new Fetch(resolution)
        .run();

System.out.println(fetchResult.path());

/Users/emccue/.jresolve/https/repo1.maven.org/maven2/com/fasterxml/jackson/core/jackson-annotations/2.15.2/jackson-annotations-2.15.2.jar:/Users/emccue/.jresolve/https/repo1.maven.org/maven2/com/fasterxml/jackson/core/jackson-core/2.15.2/jackson-core-2.15.2.jar:/Users/emccue/.jresolve/https/repo1.maven.org/maven2/com/fasterxml/jackson/core/jackson-databind/2.15.2/jackson-databind-2.15.2.jar

Use Fetched Dependencies to start a JVM

var fetchResult = new Resolve()
        .addDependency(Dependency.mavenCentral("com.fasterxml.jackson.core:jackson-databind:2.15.2"))
        .fetch()
        .run();

int exitStatus = new ProcessBuilder(List.of(
    "jshell", "--class-path", fetchResult.path()        
))
        .inheritIO()
        .start()
        .waitFor()

|  Welcome to JShell -- Version 17.0.4.1
|  For an introduction type: /help intro

jshell> import com.fasterxml.jackson.databind.ObjectMapper;

jshell> var mapper = new ObjectMapper();
mapper ==> com.fasterxml.jackson.databind.ObjectMapper@59ec2012

Resolve Dependencies with exclusions