fix: check on possible null pointer dereference #199

	#
	# Copyright (c) 2021, 2022 Oracle and/or its affiliates. All rights reserved.
	#
	# This program and the accompanying materials are made available under the
	# terms of the Eclipse Public License v. 2.0 which is available at
	# http://www.eclipse.org/legal/epl-2.0,
	# or the Eclipse Distribution License v. 1.0 which is available at
	# http://www.eclipse.org/org/documents/edl-v10.php.
	#
	# SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
	#

	name: Yasson

	on: [push, pull_request]

	jobs:
	build:
	name: Test on JDK ${{ matrix.java_version }}
	runs-on: ubuntu-latest

	strategy:
	matrix:
	java_version: [ 11, 17 ]

	steps:
	- name: Checkout for build
	uses: actions/checkout@v2.3.4
	with:
	fetch-depth: 0
	- name: Set up compile JDK
	uses: actions/setup-java@v2
	with: #Compile java needs to be the highest to ensure proper compilation of the multi-release jar
	distribution: 'adopt'
	java-version: 17
	- name: Maven cache
	uses: actions/cache@v2
	env:
	cache-name: maven-cache
	with:
	path:
	~/.m2
	key: build-${{ env.cache-name }}
	- name: Copyright
	run: bash etc/copyright.sh
	- name: Checkstyle
	run: mvn -B checkstyle:checkstyle
	- name: Yasson install
	# run: mvn -U -C -Pstaging clean install -DskipTests
	run: mvn -U -C clean install -DskipTests
	- name: Set up JDK for tests
	uses: actions/setup-java@v2
	with:
	distribution: 'adopt'
	java-version: ${{ matrix.java_version }}
	- name: Yasson tests
	run: mvn -U -B -C -Dmaven.javadoc.skip=true -Pstaging verify
	- name: JSONB-API TCK
	run: cd yasson-tck && mvn -U -B test -DargLine="-Djava.locale.providers=COMPAT"

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