Infra: Use Maven wrapper

The Maven wrapper allows running Maven without it being installed, and
to specify the version being used. That way all developers and CI
systems can use the same version easily.

Travis supports mvnw:
https://docs.travis-ci.com/user/languages/java/#maven-dependency-management

As a developer, use "./mvnw goals" instead of "mvn goals" in the future,
please.

Author: Bananeweizen

.github/workflows/maven.yml

@@ -28,7 +28,7 @@ jobs:
         java-version: 11
 
     - name: Build with Maven
-      run: mvn --errors --no-transfer-progress install
+      run: ./mvnw --errors --no-transfer-progress install
 
     - name: Difference Check
       run: ./.ci/validation.sh git-diff

.mvn/wrapper/maven-wrapper.jar

@@ -0,0 +1,18 @@
+# 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.
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.9.1/apache-maven-3.9.1-bin.zip
+wrapperUrl=https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.2.0/maven-wrapper-3.2.0.jar

.mvn/wrapper/maven-wrapper.properties

@@ -30,13 +30,13 @@ jobs:
     - jdk: openjdk11
       env:
         - DESC="install (openjdk11)"
-        - CMD="mvn --errors --no-transfer-progress install"
+        - CMD="./mvnw --errors --no-transfer-progress install"
 
     # JDK 17 (most recent Java LTS version)
     - jdk: openjdk17
       env:
         - DESC="install (openjdk17)"
-        - CMD="mvn --errors --no-transfer-progress install"
+        - CMD="./mvnw --errors --no-transfer-progress install"
 
 script:
   - ./.ci/travis.sh init-m2-repo

.travis.yml

@@ -1,9 +1,9 @@
 [![][travis img]][travis]
 
 # eclipse-cs
-The Eclipse Checkstyle plug-in integrates the Checkstyle Java code auditor into the Eclipse IDE. 
-The plug-in provides real-time feedback to the user about violations of rules that 
-check for coding style and possible error prone code constructs. 
+The Eclipse Checkstyle plug-in integrates the Checkstyle Java code auditor into the Eclipse IDE.
+The plug-in provides real-time feedback to the user about violations of rules that
+check for coding style and possible error prone code constructs.
 
 [Checkstyle](https://github.com/checkstyle/checkstyle) is an Open Source development tool to help you ensure that your Java code adheres to a set of coding standards. Checkstyle does this by inspecting your Java source code and pointing out items that deviate from a defined set of coding rules.
 
@@ -23,17 +23,17 @@ If you need to install an older version:
 - You should now see the available versions of the Checkstyle plugin from which you can select and install.
 
 ### What does it do?
-With the Checkstyle Eclipse Plugin your code is constantly inspected for coding standard deviations. Within the Eclipse workbench you are immediately notified of problems via the Eclipse Problems View and source code annotations similar to compiler errors or warnings. 
+With the Checkstyle Eclipse Plugin your code is constantly inspected for coding standard deviations. Within the Eclipse workbench you are immediately notified of problems via the Eclipse Problems View and source code annotations similar to compiler errors or warnings.
 This ensures an extremely short feedback loop right at the developers fingertips.
 
 ### Why would I use it?
-If your development team consists of more than one person, then obviously a common ground for coding standards (formatting rules, line lengths etc.) must be agreed upon - even if it is just for practical reasons to avoid superficial, format related merge conflicts. 
+If your development team consists of more than one person, then obviously a common ground for coding standards (formatting rules, line lengths etc.) must be agreed upon - even if it is just for practical reasons to avoid superficial, format related merge conflicts.
 Checkstyle (and the Eclipse Checkstyle Plugin for that matter) helps you define and easily apply those common rules.
 
 ### Build it yourself
 Clone the git repository (or create a fork) and import all projects into your Eclipse workspace.
 
-Open a command line in project root directory and run `mvn clean package`. 
+Open a command line in project root directory and run `./mvnw clean package`.
 
 Find the installable bundle update site archive `net.sf.eclipsecs-updatesite/target/net.sf.eclipsecs-updatesite_X.X.X.YYYYmmDDHHMM.zip`.
 

README.md

@@ -213,10 +213,8 @@ <h2>Build it yourself</h2>
                     workspace.
                 </p>
                 <p>
-                    To build an update site bundle package you will require Apache Maven (3.2.x should do fine).
-                    <br />
                     Open a command line in project root directory and run
-                    <code>mvn clean package</code>
+                    <code>./mvnw clean package</code>
                     .
                     <br />
                     <br />

docs/partials/index.html

@@ -15,77 +15,77 @@
   -->
   <url>
     <loc>https://checkstyle.org/eclipse-cs/</loc>
-    <lastmod>2023-04-15</lastmod>
+    <lastmod>2023-04-16</lastmod>
     <changefreq>weekly</changefreq>
   </url>
   <url>
     <loc>https://checkstyle.org/eclipse-cs/#!/releasenotes</loc>
-    <lastmod>2023-04-15</lastmod>
+    <lastmod>2023-04-16</lastmod>
     <changefreq>weekly</changefreq>
   </url>
   <url>
     <loc>https://checkstyle.org/eclipse-cs/#!/install</loc>
-    <lastmod>2023-04-15</lastmod>
+    <lastmod>2023-04-16</lastmod>
     <changefreq>weekly</changefreq>
   </url>
   <url>
     <loc>https://checkstyle.org/eclipse-cs/#!/project-setup</loc>
-    <lastmod>2023-04-15</lastmod>
+    <lastmod>2023-04-16</lastmod>
     <changefreq>weekly</changefreq>
   </url>
   <url>
     <loc>https://checkstyle.org/eclipse-cs/#!/custom-config</loc>
-    <lastmod>2023-04-15</lastmod>
+    <lastmod>2023-04-16</lastmod>
     <changefreq>weekly</changefreq>
   </url>
   <url>
     <loc>https://checkstyle.org/eclipse-cs/#!/filters</loc>
-    <lastmod>2023-04-15</lastmod>
+    <lastmod>2023-04-16</lastmod>
     <changefreq>weekly</changefreq>
   </url>
   <url>
     <loc>https://checkstyle.org/eclipse-cs/#!/configtypes</loc>
-    <lastmod>2023-04-15</lastmod>
+    <lastmod>2023-04-16</lastmod>
     <changefreq>weekly</changefreq>
   </url>
   <url>
     <loc>https://checkstyle.org/eclipse-cs/#!/properties</loc>
-    <lastmod>2023-04-15</lastmod>
+    <lastmod>2023-04-16</lastmod>
     <changefreq>weekly</changefreq>
   </url>
   <url>
     <loc>https://checkstyle.org/eclipse-cs/#!/filesets</loc>
-    <lastmod>2023-04-15</lastmod>
+    <lastmod>2023-04-16</lastmod>
     <changefreq>weekly</changefreq>
   </url>
   <url>
     <loc>https://checkstyle.org/eclipse-cs/#!/preferences</loc>
-    <lastmod>2023-04-15</lastmod>
+    <lastmod>2023-04-16</lastmod>
     <changefreq>weekly</changefreq>
   </url>
   <url>
     <loc>https://checkstyle.org/eclipse-cs/#!/extensions</loc>
-    <lastmod>2023-04-15</lastmod>
+    <lastmod>2023-04-16</lastmod>
     <changefreq>weekly</changefreq>
   </url>
   <url>
     <loc>https://checkstyle.org/eclipse-cs/#!/custom-checks</loc>
-    <lastmod>2023-04-15</lastmod>
+    <lastmod>2023-04-16</lastmod>
     <changefreq>weekly</changefreq>
   </url>
   <url>
     <loc>https://checkstyle.org/eclipse-cs/#!/builtin-config</loc>
-    <lastmod>2023-04-15</lastmod>
+    <lastmod>2023-04-16</lastmod>
     <changefreq>weekly</changefreq>
   </url>
   <url>
     <loc>https://checkstyle.org/eclipse-cs/#!/custom-filters</loc>
-    <lastmod>2023-04-15</lastmod>
+    <lastmod>2023-04-16</lastmod>
     <changefreq>weekly</changefreq>
   </url>
   <url>
     <loc>https://checkstyle.org/eclipse-cs/#!/faq</loc>
-    <lastmod>2023-04-15</lastmod>
+    <lastmod>2023-04-16</lastmod>
     <changefreq>weekly</changefreq>
   </url>
 </urlset>