[travis] Avoiding build timeouts

.travis.yml

@@ -3,6 +3,10 @@ language: java
 jdk:
   - openjdk8
 
+# See https://docs.travis-ci.com/user/languages/java/#caching
+before_cache:
+  - rm -f  $HOME/.gradle/caches/modules-2/modules-2.lock
+  - rm -fr $HOME/.gradle/caches/*/plugin-resolution/
 cache:
   directories:
   - $HOME/.m2
@@ -121,8 +125,9 @@ script:
   # fail if generators contain tab '\t'
   - /bin/bash ./bin/utils/detect_tab_in_java_class.sh
   # run integration tests defined in maven pom.xml
-  - mvn --quiet --batch-mode clean install
-  - mvn --quiet --batch-mode verify -Psamples
+  # WARN: Travis will timeout after 10 minutes of no stdout/stderr activity, which is problematic with mvn --quiet.
+  - mvn --quiet --batch-mode --show-version clean install
+  - mvn --quiet --batch-mode --show-version verify -Psamples
 after_success:
   # push to maven repo
   - if [ $SONATYPE_USERNAME ] && [ -z $TRAVIS_TAG ] && [ "$TRAVIS_PULL_REQUEST" == "false" ]; then
@@ -162,3 +167,4 @@ after_success:
 
 env:
   - DOCKER_GENERATOR_IMAGE_NAME=openapitools/openapi-generator-online DOCKER_CODEGEN_CLI_IMAGE_NAME=openapitools/openapi-generator-cli NODE_ENV=test CC=gcc-5 CXX=g++-5
+

CI/run-in-docker-settings.xml

@@ -0,0 +1,7 @@
+<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
+          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+          xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0
+                      https://maven.apache.org/xsd/settings-1.0.0.xsd">
+    <!-- This directory matches what is defined in run-in-docker.sh -->
+    <localRepository>/var/maven/.m2/repository</localRepository>
+</settings>

run-in-docker.sh

@@ -7,12 +7,18 @@ maven_cache_repo="${HOME}/.m2/repository"
 
 mkdir -p "${maven_cache_repo}"
 
+# !! The -u option below needs to be defined so we don't write to a user's bound ~/.m2/repository as root.
+# !! but using this also means we either need to setup a user with the same id, or we execute without a username and home directory.
+# !! This means we can't bind the .m2 directory to any user's directory (like /root/.m2).
+# !! We _must_ define $MAVEN_CONFIG explicitly as a location that is not /root/.m2; the user executing this may not have access to the container's user's directory.
 docker run --rm -it \
         -w /gen \
         -e GEN_DIR=/gen \
         -e MAVEN_CONFIG=/var/maven/.m2 \
+        -e MAVEN_OPTS="-Dhttps.protocols=TLSv1.2 -Dmaven.repo.local=/var/maven/.m2/repository -Dorg.slf4j.simpleLogger.log.org.apache.maven.cli.transfer.Slf4jMavenTransferListener=WARN -Dorg.slf4j.simpleLogger.showDateTime=true -Djava.awt.headless=true" \
         -u "$(id -u):$(id -g)" \
         -v "${PWD}:/gen" \
-        -v "$HOME/.m2":/root/.m2 \
+        -v "${PWD}/CI/run-in-docker-settings.xml:/var/maven/.m2/settings.xml" \
+        -v "${maven_cache_repo}:/var/maven/.m2/repository" \
         --entrypoint /gen/docker-entrypoint.sh \
         maven:3-jdk-8 "$@"