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feat: add gradle build script to pubsub/spring tutorial (GoogleCloudPlatform#6585)
* feat: add gradle build script * remove extra white lines * typo * rename bootRun property
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‎pubsub/spring/README.md

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This sample requires [Java](https://www.java.com/en/download/) and [Maven](http://maven.apache.org/) for building the application.
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1. **Follow the Java development environment set-up instructions in [the documentation](https://cloud.google.com/java/docs/setup).**
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1. **Follow the Java development environment set-up instructions in [the documentation](https://cloud.google.com/java/docs/setup).**
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1. Enable APIs for your project.
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2. Enable APIs for your project.
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[Click here](https://console.cloud.google.com/flows/enableapi?apiid=pubsub.googleapis.com&showconfirmation=true)
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to visit Cloud Platform Console and enable the Google Cloud Pub/Sub API.
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1. Create a new topic `topic-one` and attach a subscription `sub-one` to it, then do the same for `topic-two` and `sub-two`, via the Cloud Platform Console's
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3. Create a new topic `topic-one` and attach a subscription `sub-one` to it, then do the same for `topic-two` and `sub-two`, via the Cloud Platform Console's
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[Cloud Pub/Sub section](http://console.cloud.google.com/pubsub).
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1. Enable application default credentials by running the command `gcloud auth application-default login`.
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4. Enable application default credentials by running the command `gcloud auth application-default login`.
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5. Run the following Maven or Gradle commands to run `PubSubApplication`:
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1. Run the following Maven command to run `PubSubApplication`:
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```
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mvn clean spring-boot:run
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```
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```
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gradle bootRun
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```
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You should observe an incoming message getting sent to `topic-one`, received from `sub-one`, sent to `topic-two`, and received from `topic-two` in the logged messages:
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```
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2020-08-10 17:29:18.807 INFO 27310 --- [ main] demo.PubSubApplication : Started PubSubApplication in 6.063 seconds (JVM running for 6.393)

‎pubsub/spring/build.gradle

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/*
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* Copyright 2021 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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plugins {
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id 'application'
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id 'java'
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id 'org.springframework.boot' version '2.5.7'
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}
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repositories {
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mavenCentral()
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}
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bootRun {
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mainClassName = 'demo.PubSubApplication'
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}
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group = 'demo'
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version = '1.0.0-SNAPSHOT'
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description = 'Spring Cloud GCP Pub/Sub Code Sample'
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java.sourceCompatibility = JavaVersion.VERSION_1_8
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dependencies {
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implementation 'com.github.spotbugs:spotbugs-annotations:4.5.0'
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implementation 'org.springframework.boot:spring-boot-starter-web:2.5.7'
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implementation 'com.google.cloud:spring-cloud-gcp-starter-pubsub:2.0.6'
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implementation 'org.springframework.integration:spring-integration-core:5.5.6'
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implementation 'com.google.cloud:spring-cloud-gcp-pubsub-stream-binder:2.0.6'
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testImplementation 'junit:junit:4.13.2'
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testImplementation 'com.google.truth:truth:1.1.3'
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testImplementation 'org.springframework.boot:spring-boot-test:2.5.7'
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}

‎pubsub/spring/pom.xml

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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-dependencies</artifactId>
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<version>2.5.5</version>
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<version>2.5.7</version>
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<type>pom</type>
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<scope>import</scope>
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</dependency>
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<version>1.1.3</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>com.google.cloud</groupId>
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<artifactId>google-cloud-core</artifactId>
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<version>2.3.3</version>
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<classifier>tests</classifier>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-test</artifactId>

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