Make MIN_SPRING_VERSION Dynamic

Fixes: gh-5065

buildSrc/src/main/groovy/versions/VersionsResourceTasks.groovy

@@ -0,0 +1,49 @@
+/*
+ * Copyright 2002-2018 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.
+ */
+package versions
+
+import org.gradle.api.DefaultTask
+import org.gradle.api.tasks.Input
+import org.gradle.api.tasks.OutputFile
+import org.gradle.api.tasks.TaskAction
+
+/**
+ * @author Rob Winch
+ */
+class VersionsResourceTasks extends DefaultTask {
+	@OutputFile
+	File versionsFile;
+
+	@Input
+	Closure<Map<String,String>> versions;
+
+	void setVersions(Map<String,String> versions) {
+		this.versions = { versions };
+	}
+
+	void setVersions(Closure<Map<String,String>> versions) {
+		this.versions = versions
+	}
+
+	@TaskAction
+	void generateVersions() {
+		versionsFile.parentFile.mkdirs()
+		versionsFile.createNewFile()
+		Properties versionsProperties = new Properties()
+		versionsProperties.putAll(versions.call())
+		versionsProperties.store(versionsFile.newWriter(), null)
+	}
+}