Apply latest version of Spring 5.1.x and Spring Batch 4.1.x automatically on Travis CI

Author: kazuki43zoo

.travis.yml

@@ -8,7 +8,7 @@ jdk:
 
 script:
   - ./mvnw clean verify
-  - ./mvnw clean verify -Dspring.version=5.1.15.RELEASE -Dspring-batch.version=4.1.4.RELEASE
+  - ./mvnw clean verify -Dspring.version=$(./travis/get_latest_version.sh spring-core 5.1) -Dspring-batch.version=$(./travis/get_latest_version.sh batch/spring-batch-core 4.1)
 
 after_success:
   - chmod -R 777 ./travis/after_success.sh

travis/get_latest_version.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+#
+# Copyright 2010-2020 the original author or authors.
+#
+# Licensed 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.
+#
+
+
+targetArtifact=$1
+targetMinorVersion=$2
+majorVersion=${targetMinorVersion%.*}
+minorVersion=${targetMinorVersion#*.}
+while read -r line; do
+  maintenanceVersion=${line#<a*>${targetMinorVersion}.} && maintenanceVersion=${maintenanceVersion%%.*}
+  maintenanceVersions="${maintenanceVersions}${maintenanceVersion}"$'\n'
+done<<END
+  $(curl -s "https://repo1.maven.org/maven2/org/springframework/${targetArtifact}/" | grep "RELEASE" | grep -E ">${majorVersion}\.${minorVersion}\.[0-9]*")
+END
+echo "${targetMinorVersion}.$(echo "${maintenanceVersions}" | sort -n | tail -n 1).RELEASE"