Add configs to be able to create docker files easily.

.dockerignore

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+*
+!demo-server/
+
+# https://github.com/moby/moby/issues/30018
+# Docker does not understand globs in negations as nice as it should be
+# so instead of !*/target/*.war we get these:
+!demo-route-menu/target/*.war
+!demo-dynamic-menu/target/*.war
+!demo-minesweeper-element/target/*.war
+!demo-static-menu/target/*.war
+!demo-todo-template/target/*.war
+!demo-google-signin/target/*.war
+!demo-minesweeper-polymer/target/*.war
+!demo-static-menu-router/target/*.war
+!demo-addressbook-polymer/target/*.war
+!demo-hello-worlds/target/*.war
+!demo-model-converters/target/*.war
+!demo-contact-form/target/*.war
+!demo-jquery-table/target/*.war
+!demo-registration-form/target/*.war
+!demo-textfield-component/target/*.war
+!demo-web-site/target/*.war
+!demo-date-field/target/*.war
+!demo-minesweeper-component/target/*.war
+!demo-textfield-composite/target/*.war

Dockerfile

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+FROM tomcat:9.0.10-jre8-alpine
+COPY demo-server/ ${CATALINA_HOME}/
+COPY */target/*.war ${CATALINA_HOME}/webapps/
+RUN ln -s ${CATALINA_HOME}/webapps/$(basename ${CATALINA_HOME}/webapps/demo-flow-components-*.war .war) ${CATALINA_HOME}/webapps/components

create_and_run_demos_container.sh

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+#!/usr/bin/env bash
+docker build -t flow-demos .
+docker rm flow-demos
+docker run -p 8080:8080 -d --name flow-demos flow-demos

demo-server/conf/catalina.properties

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+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+#
+# List of comma-separated packages that start with or equal this string
+# will cause a security exception to be thrown when
+# passed to checkPackageAccess unless the
+# corresponding RuntimePermission ("accessClassInPackage."+package) has
+# been granted.
+package.access=sun.,org.apache.catalina.,org.apache.coyote.,org.apache.jasper.,org.apache.tomcat.
+#
+# List of comma-separated packages that start with or equal this string
+# will cause a security exception to be thrown when
+# passed to checkPackageDefinition unless the
+# corresponding RuntimePermission ("defineClassInPackage."+package) has
+# been granted.
+#
+# by default, no packages are restricted for definition, and none of
+# the class loaders supplied with the JDK call checkPackageDefinition.
+#
+package.definition=sun.,java.,org.apache.catalina.,org.apache.coyote.,\
+org.apache.jasper.,org.apache.naming.,org.apache.tomcat.
+
+#
+#
+# List of comma-separated paths defining the contents of the "common"
+# classloader. Prefixes should be used to define what is the repository type.
+# Path may be relative to the CATALINA_HOME or CATALINA_BASE path or absolute.
+# If left as blank,the JVM system loader will be used as Catalina's "common"
+# loader.
+# Examples:
+#     "foo": Add this folder as a class repository
+#     "foo/*.jar": Add all the JARs of the specified folder as class
+#                  repositories
+#     "foo/bar.jar": Add bar.jar as a class repository
+#
+# Note: Values are enclosed in double quotes ("...") in case either the
+#       ${catalina.base} path or the ${catalina.home} path contains a comma.
+#       Because double quotes are used for quoting, the double quote character
+#       may not appear in a path.
+common.loader="${catalina.base}/lib","${catalina.base}/lib/*.jar","${catalina.home}/lib","${catalina.home}/lib/*.jar"
+
+#
+# List of comma-separated paths defining the contents of the "server"
+# classloader. Prefixes should be used to define what is the repository type.
+# Path may be relative to the CATALINA_HOME or CATALINA_BASE path or absolute.
+# If left as blank, the "common" loader will be used as Catalina's "server"
+# loader.
+# Examples:
+#     "foo": Add this folder as a class repository
+#     "foo/*.jar": Add all the JARs of the specified folder as class
+#                  repositories
+#     "foo/bar.jar": Add bar.jar as a class repository
+#
+# Note: Values may be enclosed in double quotes ("...") in case either the
+#       ${catalina.base} path or the ${catalina.home} path contains a comma.
+#       Because double quotes are used for quoting, the double quote character
+#       may not appear in a path.
+server.loader=
+
+#
+# List of comma-separated paths defining the contents of the "shared"
+# classloader. Prefixes should be used to define what is the repository type.
+# Path may be relative to the CATALINA_BASE path or absolute. If left as blank,
+# the "common" loader will be used as Catalina's "shared" loader.
+# Examples:
+#     "foo": Add this folder as a class repository
+#     "foo/*.jar": Add all the JARs of the specified folder as class
+#                  repositories
+#     "foo/bar.jar": Add bar.jar as a class repository
+# Please note that for single jars, e.g. bar.jar, you need the URL form
+# starting with file:.
+#
+# Note: Values may be enclosed in double quotes ("...") in case either the
+#       ${catalina.base} path or the ${catalina.home} path contains a comma.
+#       Because double quotes are used for quoting, the double quote character
+#       may not appear in a path.
+shared.loader=
+
+# Default list of JAR files that should not be scanned using the JarScanner
+# functionality. This is typically used to scan JARs for configuration
+# information. JARs that do not contain such information may be excluded from
+# the scan to speed up the scanning process. This is the default list. JARs on
+# this list are excluded from all scans. The list must be a comma separated list
+# of JAR file names.
+# The list of JARs to skip may be over-ridden at a Context level for individual
+# scan types by configuring a JarScanner with a nested JarScanFilter.
+# The JARs listed below include:
+# - Tomcat Bootstrap JARs
+# - Tomcat API JARs
+# - Catalina JARs
+# - Jasper JARs
+# - Tomcat JARs
+# - Common non-Tomcat JARs
+# - Test JARs (JUnit, Cobertura and dependencies)
+tomcat.util.scan.StandardJarScanFilter.jarsToSkip=\
+bootstrap.jar,commons-daemon.jar,tomcat-juli.jar,\
+annotations-api.jar,el-api.jar,jsp-api.jar,servlet-api.jar,websocket-api.jar,\
+jaspic-api.jar,\
+catalina.jar,catalina-ant.jar,catalina-ha.jar,catalina-storeconfig.jar,\
+catalina-tribes.jar,\
+jasper.jar,jasper-el.jar,ecj-*.jar,\
+tomcat-api.jar,tomcat-util.jar,tomcat-util-scan.jar,tomcat-coyote.jar,\
+tomcat-dbcp.jar,tomcat-jni.jar,tomcat-websocket.jar,\
+tomcat-i18n-en.jar,tomcat-i18n-es.jar,tomcat-i18n-fr.jar,tomcat-i18n-ja.jar,\
+tomcat-juli-adapters.jar,catalina-jmx-remote.jar,catalina-ws.jar,\
+tomcat-jdbc.jar,\
+tools.jar,\
+commons-beanutils*.jar,commons-codec*.jar,commons-collections*.jar,\
+commons-dbcp*.jar,commons-digester*.jar,commons-fileupload*.jar,\
+commons-httpclient*.jar,commons-io*.jar,commons-lang*.jar,commons-logging*.jar,\
+commons-math*.jar,commons-pool*.jar,\
+jstl.jar,taglibs-standard-spec-*.jar,\
+geronimo-spec-jaxrpc*.jar,wsdl4j*.jar,\
+ant.jar,ant-junit*.jar,aspectj*.jar,jmx.jar,h2*.jar,hibernate*.jar,httpclient*.jar,\
+jmx-tools.jar,jta*.jar,log4j*.jar,mail*.jar,slf4j*.jar,\
+xercesImpl.jar,xmlParserAPIs.jar,xml-apis.jar,\
+junit.jar,junit-*.jar,hamcrest-*.jar,easymock-*.jar,cglib-*.jar,\
+objenesis-*.jar,ant-launcher.jar,\
+cobertura-*.jar,asm-*.jar,dom4j-*.jar,icu4j-*.jar,jaxen-*.jar,jdom-*.jar,\
+jetty-*.jar,oro-*.jar,servlet-api-*.jar,tagsoup-*.jar,xmlParserAPIs-*.jar,\
+xom-*.jar
+
+# Default list of JAR files that should be scanned that overrides the default
+# jarsToSkip list above. This is typically used to include a specific JAR that
+# has been excluded by a broad file name pattern in the jarsToSkip list.
+# The list of JARs to scan may be over-ridden at a Context level for individual
+# scan types by configuring a JarScanner with a nested JarScanFilter.
+tomcat.util.scan.StandardJarScanFilter.jarsToScan=\
+log4j-web*.jar,log4j-taglib*.jar,log4javascript*.jar,slf4j-taglib*.jar
+
+# String cache configuration.
+tomcat.util.buf.StringCache.byte.enabled=true
+#tomcat.util.buf.StringCache.char.enabled=true
+#tomcat.util.buf.StringCache.trainThreshold=500000
+#tomcat.util.buf.StringCache.cacheSize=5000
+
+# Allow for changes to HTTP request validation
+# WARNING: Using this option will expose the server to CVE-2016-6816
+#tomcat.util.http.parser.HttpParser.requestTargetAllow=|
+
+# Flow development mode
+vaadin.productionMode=true
+
+# Google signin authorisation client id
+vaadin.google.auth.client.id=85635090148-v10q4vim1gc77ngjb8836ikm0dvvefl9.apps.googleusercontent.com
+
+
+# Be strict about web-fragment.xml contents
+# https://tomcat.apache.org/tomcat-8.5-doc/config/systemprops.html#Specifications
+org.apache.catalina.STRICT_SERVLET_COMPLIANCE=true