Initial gradle build layer.

.gitattributes

@@ -0,0 +1,2 @@
+# Ignore all differences in line endings for the lock file.
+versions.lock text eol=lf

.gitignore

@@ -30,3 +30,6 @@ __pycache__
 /dev-tools/scripts/scripts.iml
 .DS_Store
 
+build/
+.gradle/
+.idea/

.travis.yml

@@ -0,0 +1,17 @@
+language: java
+
+jdk:
+  - openjdk11
+
+before_cache:
+  - rm -f  $HOME/.gradle/caches/modules-2/modules-2.lock
+  - rm -fr $HOME/.gradle/caches/*/plugin-resolution/
+
+cache:
+  directories:
+    - $HOME/.gradle/caches/
+    - $HOME/.gradle/wrapper/
+
+script:
+  - ./gradlew assemble --scan --stacktrace -Ptravis
+

build.gradle

@@ -0,0 +1,49 @@
+plugins {
+  id "base"
+  id "com.palantir.consistent-versions" version "1.12.4"
+  id "com.gradle.build-scan" version "3.0"
+}
+
+// Project version and main properties. Applies to all projects.
+allprojects {
+  version = "9.0.0-SNAPSHOT"
+}
+
+// Include smaller chunks configuring dedicated build areas.
+// Some of these intersect or add additional functionality.
+// The order of inclusion of these files shouldn't matter (but may
+// if the build file is incorrectly written and evaluates something
+// eagerly).
+
+// CI systems.
+apply from: file('gradle/buildscan.gradle')
+apply from: file('gradle/travis.gradle')
+
+// Set up defaults and configure aspects for certain modules or functionality
+// (java, tests)
+apply from: file('gradle/defaults.gradle')
+apply from: file('gradle/defaults-java.gradle')
+apply from: file('gradle/testing/defaults-tests.gradle')
+apply from: file('gradle/testing/defaults-tests-solr.gradle')
+apply from: file('gradle/testing/randomization.gradle')
+apply from: file('gradle/defaults-maven.gradle')
+
+// IDE settings and specials.
+apply from: file('gradle/defaults-idea.gradle')
+
+// Additional development aids.
+apply from: file('gradle/maven-local.gradle')
+apply from: file('gradle/testing/per-project-summary.gradle')
+apply from: file('gradle/testing/slowest-tests-at-end.gradle')
+apply from: file('gradle/help.gradle')
+
+// Ant-compatibility layer. ALL OF THESE SHOULD BE GONE at some point. They are
+// here so that we can coexist with current ant build but they are indicative
+// of potential problems with the build conventions, dependencies, etc.
+apply from: file('gradle/ant-compat/folder-layout.gradle')
+apply from: file('gradle/ant-compat/misc.gradle')
+apply from: file('gradle/ant-compat/resolve.gradle')
+apply from: file('gradle/ant-compat/post-jar.gradle')
+apply from: file('gradle/ant-compat/test-classes-cross-deps.gradle')
+apply from: file('gradle/ant-compat/artifact-naming.gradle')
+

gradle.TODO

@@ -0,0 +1,52 @@
+
+The gradle build is currently missing or could use some love in the following areas:
+
+- Apply forbiddenAPIs
+
+- configure security policy/ sandboxing for tests (!).
+
+- add test 'beasting' (rerunning the same suite multiple times). I'm afraid it'll be difficult
+  to run it sensibly because gradle doesn't offer cwd separation for the forked test runners (?)
+
+- jar checksums, jar checksum computation and validation.
+  this should be done without intermediate folders (directly
+  on dependency sets).
+
+- add a :helpDeps explanation to how the dependency system works (palantir plugin, lockfile) and
+  how to retrieve structured information about current dependencies of a given module 
+  (in a tree-like output).
+
+- identify and list precommit tasks so that they can be ported one by one.
+
+- identify and port any other "check" utilities that may be called from ant.
+
+- identify and port various "regenerate" tasks from ant builds (javacc, precompiled automata, etc.)
+
+- add rendering of javadocs (gradlew javadoc) and attaching them to maven publications.
+
+- fill in POM details in gradle/defaults-maven.gradle so that they reflect the previous content better
+  (dependencies aside).
+
+- Add any IDE integration layers that should be added (I use IntelliJ and it imports the project
+  out of the box, without the need for any special tuning).
+
+- Clean up dependencies, especially for Solr: any { transitive = false } should just explicitly
+  exclude whatever they don't need (and their dependencies currently declared explicitly
+  should be folded). Figure out which scope to import a dependency to.
+
+- add Solr packaging for docs/* (see TODO in packaging/build.gradle; currently XSLT...)
+
+- I didn't bother adding Solr dist/test-framework to packaging (who'd use it from a binary
+  distribution?)
+
+Intentional differences:
+
+- the back-compatibility target 'resolve' is added to gradle but it's really for informational purposes
+  and debugging. Packaging should be done from subcomponent configurations and dependencies,
+  not from source folders... "gradlew -p packaging assemble" puts together the entire Solr distribution
+  under packaging/build where it doesn't interfere with sources.
+
+  'resolve' for Lucene  also does *not* copy test dependencies under lib/ (like ant version does).
+
+- transitive export of certain core libraries from solr-core/ solrj (guava, etc.).
+

gradle.properties

@@ -0,0 +1,4 @@
+systemProp.file.encoding=UTF-8
+
+org.gradle.parallel=true
+org.gradle.priority=low

gradle/ant-compat/artifact-naming.gradle

@@ -0,0 +1,15 @@
+// Stick to previous artifact names (not identical to path/ folders).
+configure(subprojects.findAll { it.path.contains(':solr:contrib:') }) {
+  project.archivesBaseName = project.archivesBaseName.replace("-contrib-", "-")
+}
+
+// This project has a different artifact name (solr-contrib-cell). Don't know why.
+configure(project(":solr:contrib:extraction")) {
+  archivesBaseName = "solr-cell"
+}
+
+configure(subprojects.findAll { it.path.contains(':lucene:analysis:') }) {
+  project.archivesBaseName = project.archivesBaseName.replace("-analysis-", "-analyzers-")
+}
+
+

gradle/ant-compat/folder-layout.gradle

@@ -0,0 +1,26 @@
+// Adapt to custom folder convention.
+allprojects {
+  plugins.withType(JavaPlugin) {
+    sourceSets {
+      main.java.srcDirs = ['src/java']
+      main.resources.srcDirs = ['src/resources']
+      test.java.srcDirs = ['src/test']
+      test.resources.srcDirs = ['src/test-files']
+    }
+
+    task copyTestResources(type: Copy) {
+      from('src/test') {
+        exclude '**/*.java'
+      }
+      into sourceSets.test.java.outputDir
+    }
+    processTestResources.dependsOn copyTestResources
+  }
+}
+
+// Adapt to custom 'web' folder location.
+configure(project(":solr:webapp")) {
+  plugins.withType(WarPlugin) {
+    webAppDirName = "web"
+  }
+}

gradle/ant-compat/misc.gradle

@@ -0,0 +1,42 @@
+
+// Exclude inner classes from testing.
+allprojects {
+  tasks.withType(Test) { task ->
+    exclude '**/*$*'
+  }
+}
+
+// Exclude test classes that are not actually stand-alone tests (they're executed from other stuff).
+configure(project(":lucene:replicator")) {
+  plugins.withType(JavaPlugin) {
+    test {
+      exclude "**/SimpleServer*"
+    }
+  }
+}
+
+
+// Resources from top-level project folder are looked up via getClass(). Strange.
+configure(project(":lucene:benchmark")) {
+  plugins.withType(JavaPlugin) {
+    task syncConf(type: Sync) {
+      from('conf')
+      into file("${sourceSets.test.java.outputDir}/conf")
+    }
+    processTestResources.dependsOn syncConf
+  }
+}
+
+// lucene:replicator has httpclient dependency with transitive commons-logging:1.2 but currently
+// requires 1.1.2. This commons-logging should be removed entirely and replaced with slf4j-to-*
+// redirector.
+configure(project(":lucene:replicator")) {
+  plugins.withType(JavaPlugin) {
+    configurations.all {
+      resolutionStrategy {
+        force 'commons-logging:commons-logging:1.1.3'
+      }
+    }
+  }
+}
+

gradle/ant-compat/post-jar.gradle

@@ -0,0 +1,34 @@
+// This adds a configuration and artifact to solr-core which exports "post.jar" tool.
+// this should be a separate project instead (it is self-contained and classes are reused
+// in many places).
+
+configure(project(":solr:core")) {
+  plugins.withType(JavaPlugin) {
+    configurations {
+      postJar
+    }
+
+    task assemblePostJar(type: Jar) {
+      dependsOn classes
+
+      archiveFileName = "post.jar"
+      destinationDirectory = file("${buildDir}/postJar")
+
+      from(sourceSets.main.output, {
+        include "org/apache/solr/util/CLIO.class"
+        include "org/apache/solr/util/SimplePostTool*.class"
+        include "org/apache/solr/util/RTimer*.class"
+      })
+
+      manifest {
+        attributes("Main-Class": "org.apache.solr.util.SimplePostTool")
+      }
+    }
+
+    artifacts {
+      postJar assemblePostJar
+    }
+
+    assemble.dependsOn assemblePostJar
+  }
+}