Extended class method are not available when exported as library

Question

I am trying to build a java library (streaming-client.jar) and use it in client microservice.

Within this jar file I have one POJO class which is extending third party POJO classs

 @ConditionalOnClass({Options.class})
 @ConfigurationProperties(prefix = "nats.spring")
 public class ServerProps extends NatsProperties {
 
   public ServerProps(){ super(); }
  }

Now this NatsProperties class is coming from third party library and this class extends another autoconfiguration class.

When I use ServerProps locally within this libary I can access the methods from NatsProperties super class.

But When I export this library as jar file. and use it in client application.

NatsProperties methods are not available via ServerProps class

At client

  ServerProps props = new ServerProps();
  props.server("sdfsfsdfsdf")//server method cant be resolved,

EDIT

I tried adding all the methods from NatsProperties class to my custom Class StreamingServerProperties

then when I tried to access them in other project like below

   StreamingServerProperties props = new StreamingServerProperties();
   props.server("serverUrl") //Intellij complains that Cannot access io.nats.spring.boot.autoconfigure.NatsProperties

build.gradle of streaming-client.jar

  plugins {
    id 'java-library'
    id 'maven-publish'
    id "com.github.johnrengelman.shadow" version "7.1.2"
  }

 group = 'com.dexter'
 version = '0.0.1-SNAPSHOT'
 sourceCompatibility = '11'

 repositories {
    mavenCentral()

  }

publishing {
     publications {
          mavenJava(MavenPublication) {
                from components.java
                versionMapping {
                    usage('java-api') {
                        fromResolutionOf('runtimeClasspath')
                    }
               usage('java-runtime') {
                   fromResolutionResult()
               }
            }
         }
     }
   }
  tasks.named('compileJava') {
        inputs.files(tasks.named('processResources'))
  }
 dependencies {
     implementation 'io.nats:nats-spring:0.5.6'
     testImplementation 'org.junit.vintage:junit-vintage-engine:5.9.0'
     testImplementation 'org.springframework.boot:spring-boot-starter-test:2.6.3'
     testImplementation 'org.junit.jupiter:junit-jupiter-engine:5.9.0'
     testImplementation 'org.junit.platform:junit-platform-engine:1.9.0'
        testImplementation 'org.junit.platform:junit-platform-launcher:1.8.2'
    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.9.0'
    implementation('np.com.madanpokharel.embed:nats-embedded:2.1.0')
   }

  tasks.named('test') {
   useJUnitPlatform()
 }

I am using ./gradlew build task which generates a jar and with this jar I am not able to get the NatsProperties class methods.

But if I use fatJar task from this shadow plugin I am able to get the methods but thing is its creating all of the libraries and size is too big.

That sounds like the dependencies of the library are not retrieved. Are you distributing the library as a simple jar file, or as a maven artifact with pom.xml in a repository? — slindenau, Aug 22 '22 at 07:14
@slindenau please see my question, I added library`build.gradle` — Rookie007, Aug 22 '22 at 12:52
And how do you add this library to your project that is using it? — slindenau, Aug 22 '22 at 13:32
@slindenau `implementation 'com.dexter:streaming-client:0.0.1-SNAPSHOT'` like this — Rookie007, Aug 22 '22 at 14:05
@slindenau weird part is I am able to connect to streaming server using this library and able to publish as well, but just this class `StreamingServerProperties` is not able to grab super class methods and its members. — Rookie007, Aug 22 '22 at 14:06
So only an issue in the IDE? Maybe it's not synced with the gradle dependencies? — slindenau, Aug 22 '22 at 14:11
@slindenau I am not sure if its IDE issue, or its actually not able to export those classes. how do we try without IDE involvement ? — Rookie007, Aug 22 '22 at 14:21
I'm no gradle expert sadly, but if the code is executing without problems it looks like the library is loaded just fine. Did you try something like this? https://stackoverflow.com/questions/32652738/how-can-i-force-update-all-the-snapshot-gradle-dependencies-in-intellij — slindenau, Aug 22 '22 at 14:35
I am able to solve it by making dependencies in `streaming-server-client` as `api ` instead of `implementation` — Rookie007, Aug 24 '22 at 03:06
Great, if you want you can write up your solution and [answer your own question](https://stackoverflow.com/help/self-answer). Try to explain why it works with these settings. — slindenau, Aug 24 '22 at 07:02

score 0 · Answer 1 · answered Aug 21 '22 at 18:27

0

Can you add this dependency so intellij will generate the configuration metadata for you in target

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-configuration-processor</artifactId>
    <optional>true</optional>
</dependency>

answered Aug 21 '22 at 18:27

muhammed ozbilici

667
6
17

I have tried this, still I am not able to access the methods of that calls at client side. – Rookie007 Aug 21 '22 at 20:43

score 0 · Accepted Answer · answered Aug 25 '22 at 03:17

I was able to solve it by adding dependency as an api

instead of

   implementation 'io.nats:nats-sprin:0.5.6' // this adds to runtimeclass path

I tried this

   api 'io.nats:nats-sprin:0.5.6' //this adds to both compile and runtime

As I am using java-library gradle plugin.

Extended class method are not available when exported as library

2 Answers2

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