3.x: Fix ObservableSwitchMap NPE due to onSubscribe-cancel race #558

	# This workflow will build a Java project with Gradle
	# For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-gradle

	name: JDK 11

	on:
	push:
	branches: [ 3.x ]
	pull_request:
	branches: [ 3.x ]

	permissions:
	contents: read

	jobs:
	build:

	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	- name: Set up JDK 11
	uses: actions/setup-java@v3
	with:
	distribution: 'zulu'
	java-version: '11'
	- name: Cache Gradle packages
	uses: actions/[email protected]
	with:
	path: ~/.gradle/caches
	key: ${{ runner.os }}-gradle-1-${{ hashFiles('*/.gradle') }}
	restore-keys: ${{ runner.os }}-gradle-1-
	- name: Grant execute permission for gradlew
	run: chmod +x gradlew
	- name: Verify generated module-info
	run: ./gradlew -PjavaCompatibility=9 jar
	- name: Build RxJava
	run: ./gradlew build --stacktrace
	- name: Generate Javadoc
	run: ./gradlew javadoc --stacktrace

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