Avoid Logstash's classes in plugin's uber jar due to shading

CHANGELOG.md

@@ -1,3 +1,6 @@
+## 1.0.3
+- Updates Gradle script to avoid bundling of Logstash classes [#15](https://github.com/logstash-plugins/logstash-input-java_input_example/pull/15)
+
 ## 1.0.2
 - Updates to improve compatibility with latest Logstash versions
  - Update gradle version to enable JDK17 usage

VERSION

@@ -1 +1 @@
-1.0.2
+1.0.3

build.gradle

@@ -1,6 +1,16 @@
 import java.nio.file.Files
 import static java.nio.file.StandardCopyOption.REPLACE_EXISTING
 
+if (!hasProperty('LOGSTASH_CORE_PATH')) {
+ logger.error """*****************
+ |Property LOGSTASH_CORE_PATH is not defined.
+ |Create a gradle.properties file and insert the LOGSTASH_CORE_PATH pointing to the logstash-core folder
+ |of a local Logstash clone.
+ |*****************
+ """.stripMargin()
+ throw new GradleException("Property LOGSTASH_CORE_PATH is not defined.")
+}
+
 apply plugin: 'java'
 apply from: LOGSTASH_CORE_PATH + "/../rubyUtils.gradle"
 
@@ -26,33 +36,29 @@ targetCompatibility = 1.8
 buildscript {
  repositories {
  mavenCentral()
- jcenter()
- }
-
- dependencies {
- classpath 'com.github.jengelman.gradle.plugins:shadow:4.0.4'
+ gradlePluginPortal()
  }
 }
 
 repositories {
  mavenCentral()
 }
 
-apply plugin: 'com.github.johnrengelman.shadow'
-
-shadowJar {
- archiveClassifier = null
+configurations {
+ implementation.canBeResolved = true
 }
 
 dependencies {
  implementation 'org.apache.commons:commons-lang3:3.7'
  compileOnly 'org.apache.logging.log4j:log4j-api:2.17.0' // provided by Logstash
  compileOnly 'org.apache.logging.log4j:log4j-core:2.17.0' // provided by Logstash
 
- implementation fileTree(dir: LOGSTASH_CORE_PATH, include: "**/logstash-core.jar")
+ implementation fileTree(dir: LOGSTASH_CORE_PATH, include: "**/lib/jars/logstash-core.jar")
 
  testImplementation 'junit:junit:4.12'
  testImplementation 'org.jruby:jruby-complete:9.2.20.1'
+ testImplementation 'org.apache.logging.log4j:log4j-api:2.17.0' // provided by Logstash
+ testImplementation 'org.apache.logging.log4j:log4j-core:2.17.0' // provided by Logstash
 }
 
 clean {
@@ -65,14 +71,31 @@ clean {
  }
 }
 
+jar {
+ manifest {
+ attributes(
+ 'Logstash-plugin': "${pluginInfo.pluginFullName()}-${project.version}"
+ )
+ }
+}
+
 tasks.withType(JavaCompile) {
  options.encoding = 'UTF-8'
 }
 
 tasks.register("vendor"){
- dependsOn shadowJar
+ dependsOn jar
  doLast {
  String vendorPathPrefix = "vendor/jar-dependencies"
+ configurations.runtimeClasspath.allDependencies
+ .findAll {dep -> dep.group != null } // removes fileTree dependencies
+ .each {dep ->
+ File f = configurations.runtimeClasspath.filter { it.absolutePath.contains("${dep.group}/${dep.name}/${dep.version}") }.singleFile
+ String groupPath = dep.group.replaceAll('\\.', '/')
+ File newJarFile = file("${vendorPathPrefix}/${groupPath}/${dep.name}/${dep.version}/${dep.name}-${dep.version}.jar")
+ newJarFile.mkdirs()
+ Files.copy(f.toPath(), newJarFile.toPath(), REPLACE_EXISTING)
+ }
  String projectGroupPath = project.group.replaceAll('\\.', '/')
  File projectJarFile = file("${vendorPathPrefix}/${projectGroupPath}/${pluginInfo.pluginFullName()}/${project.version}/${pluginInfo.pluginFullName()}-${project.version}.jar")
  projectJarFile.mkdirs()
@@ -83,7 +106,11 @@ tasks.register("vendor"){
 
 tasks.register("generateRubySupportFiles") {
  doLast {
- generateRubySupportFilesForPlugin(project.description, project.group, version)
+ // clean dependencies without group, like the Logstash fileTree
+ var deps = configurations.runtimeClasspath.allDependencies
+ .findAll {dep -> dep.group != null }
+
+ generateRubySupportFilesForPlugin(project.description, project.group, version, deps)
  }
 }
 
@@ -103,4 +130,4 @@ tasks.register("gem"){
  doLast {
  buildGem(projectDir, buildDir, pluginInfo.pluginFullName() + ".gemspec")
  }
-}
+}