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Posted to issues@flink.apache.org by "ASF GitHub Bot (JIRA)" <ji...@apache.org> on 2018/07/10 10:04:00 UTC
[jira] [Commented] (FLINK-9222) Add a Gradle Quickstart
[ https://issues.apache.org/jira/browse/FLINK-9222?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16538345#comment-16538345 ]
ASF GitHub Bot commented on FLINK-9222:
---------------------------------------
Github user NicoK commented on a diff in the pull request:
https://github.com/apache/flink/pull/5900#discussion_r201286036
--- Diff: docs/quickstart/java_api_quickstart.md ---
@@ -108,16 +118,201 @@ In Eclipse, choose
box: `-Xmx800m`.
In IntelliJ IDEA recommended way to change JVM options is from the `Help | Edit Custom VM Options` menu. See [this article](https://intellij-support.jetbrains.com/hc/en-us/articles/206544869-Configuring-JVM-options-and-platform-properties) for details.
-## Build Project
+### Build Project
If you want to __build/package your project__, go to your project directory and
run the '`mvn clean package`' command.
You will __find a JAR file__ that contains your application, plus connectors and libraries
that you may have added as dependencies to the application: `target/<artifact-id>-<version>.jar`.
__Note:__ If you use a different class than *StreamingJob* as the application's main class / entry point,
-we recommend you change the `mainClass` setting in the `pom.xml` file accordingly. That way, the Flink
-can run time application from the JAR file without additionally specifying the main class.
+we recommend you change the `mainClass` setting in the `pom.xml` file accordingly. That way, Flink
+can run the application from the JAR file without additionally specifying the main class.
+
+## Gradle
+
+### Requirements
+
+The only requirements are working __Gradle 3.x__ (or higher) and __Java 8.x__ installations.
+
+### Create Project
+
+Use one of the following commands to __create a project__:
+
+<ul class="nav nav-tabs" style="border-bottom: none;">
+ <li class="active"><a href="#gradle-example" data-toggle="tab"><strong>Gradle example</strong></a></li>
+ <li><a href="#gradle-script" data-toggle="tab">Run the <strong>quickstart script</strong></a></li>
+</ul>
+<div class="tab-content">
+ <div class="tab-pane active" id="gradle-example">
+
+ <ul class="nav nav-tabs" style="border-bottom: none;">
+ <li class="active"><a href="#gradle-build" data-toggle="tab"><tt>build.gradle</tt></a></li>
+ <li><a href="#gradle-settings" data-toggle="tab"><tt>settings.gradle</tt></a></li>
+ </ul>
+ <div class="tab-content">
+ <div class="tab-pane active" id="gradle-build">
+ {% highlight gradle %}
+buildscript {
+ repositories {
+ jcenter() // this applies only to the Gradle 'Shadow' plugin
+ }
+ dependencies {
+ classpath 'com.github.jengelman.gradle.plugins:shadow:2.0.3'
+ }
+}
+
+plugins {
+ id 'java'
+ id 'application'
+ // shadow plugin to produce fat JARs
+ id 'com.github.johnrengelman.shadow' version '2.0.3'
+}
+
+
+// artifact properties
+group = 'org.myorg.quickstart'
+version = '0.1-SNAPSHOT'
+mainClassName = 'org.myorg.quickstart.StreamingJob'
+description = """Flink Quickstart Job"""
+
+ext {
+ javaVersion = '1.8'
+ flinkVersion = '1.6-SNAPSHOT'
+ scalaBinaryVersion = '2.11'
+ slf4jVersion = '1.7.7'
+ log4jVersion = '1.2.17'
+}
+
+
+sourceCompatibility = javaVersion
+targetCompatibility = javaVersion
+tasks.withType(JavaCompile) {
+ options.encoding = 'UTF-8'
+}
+
+applicationDefaultJvmArgs = ["-Dlog4j.configuration=log4j.properties"]
+
+// declare where to find the dependencies of your project
+repositories {
+ mavenCentral()
+ maven { url "https://repository.apache.org/content/repositories/snapshots/" }
+}
+
+// NOTE: We cannot use "compileOnly" or "shadow" configurations since then we could not run code
+// in the IDE or with "gradle run". We also cannot exclude transitive dependencies from the
+// shadowJar yet (see https://github.com/johnrengelman/shadow/issues/159).
--- End diff --
Thanks for this tip, unfortunately, this still leaves us with the inability to exclude transitive dependencies from the shaded jar, i.e.
```
flinkShadowJar.exclude group: 'org.apache.flink', module: 'force-shading'
flinkShadowJar.exclude group: 'com.google.code.findbugs', module: 'jsr305'
flinkShadowJar.exclude group: 'org.slf4j'
flinkShadowJar.exclude group: 'log4j'
```
Therefore, we still need the workaround with our own configuration for dependencies that go into the shaded jar.
> Add a Gradle Quickstart
> -----------------------
>
> Key: FLINK-9222
> URL: https://issues.apache.org/jira/browse/FLINK-9222
> Project: Flink
> Issue Type: Improvement
> Components: Project Website, Quickstarts
> Reporter: Nico Kruber
> Assignee: Nico Kruber
> Priority: Critical
> Labels: pull-request-available
>
> Having a proper project template helps a lot in getting dependencies right. For example, setting the core dependencies to "provided", the connector / library dependencies to "compile", etc.
> The Maven quickstarts are in good shape by now, but there is none for Gradle and Gradle users to get this wrong quite often.
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