Enable lint and errorprone checks in Jdk11

.github/workflows/ci.yml

@@ -17,18 +17,29 @@ jobs:
   quick-build:
     if: github.event_name == 'pull_request' && !contains(github.event.pull_request.labels.*.name, 'CI build')
     runs-on: ubuntu-latest
+    container: centos:7
     steps:
       - name: Checkout repository
         uses: actions/checkout@v1
-      - name: Setup Java
-        uses: actions/setup-java@v1
-        with:
-          java-version: 8 
+      - name: Install environment
+        run: |
+          yum -y update
+          yum -y install centos-release-scl-rh epel-release
+          yum -y install java-11-openjdk-devel devtoolset-7
+          echo Downloading Maven
+          curl -L https://archive.apache.org/dist/maven/maven-3/3.6.3/binaries/apache-maven-3.6.3-bin.tar.gz -o $HOME/apache-maven-3.6.3-bin.tar.gz
+          tar xzf $HOME/apache-maven-3.6.3-bin.tar.gz -C /opt/
+          ln -sf /opt/apache-maven-3.6.3/bin/mvn /usr/bin/mvn
       - name: Build project
         run: |
-          git --version
+          source scl_source enable devtoolset-7 || true 
+          export JAVA_HOME=$(dirname $(dirname $(readlink $(readlink $(which javac)))))
+          echo $JAVA_HOME
           mvn -version
-          mvn clean install -Pdev -B -U -e
+          mvn clean install -Pdev,jdk11 -B -U -e -Dlint.skip=true
+      - name: Run lint checks
+        run: |
+          mvn compiler:compile -Pdev,jdk11 -B -U -e
   prepare:
     runs-on: ubuntu-latest
     outputs:

pom.xml

@@ -41,6 +41,7 @@
     <junit.version>5.6.2</junit.version>
     <jmh.version>1.21</jmh.version>
     <versions-plugin.version>2.7</versions-plugin.version>
+    <errorprone.version>2.6.0</errorprone.version>
     <maven.javadoc.skip>true</maven.javadoc.skip>
     <maven.source.skip>true</maven.source.skip>
     <gpg.skip>true</gpg.skip>
@@ -174,6 +175,60 @@
         <maven.compiler.release>11</maven.compiler.release>
       </properties>
     </profile>
+
+    <!--
+      Profile that enables lint checks on compilation
+      Uses Google Error Prone for more coverage
+    -->
+    <profile>
+      <id>lint</id>
+      <activation>
+        <!-- activate lint checks only on JDK1.9+ (required by Error Prone) -->
+        <jdk>(1.9,)</jdk>
+        <!-- custom property to disable link checks on command line (enabled by default) -->
+        <property>
+          <name>!lint.skip</name>
+          <value>!true</value>
+        </property>
+      </activation>
+      <build>
+        <plugins>
+          <plugin>
+            <groupId>org.apache.maven.plugins</groupId>
+            <artifactId>maven-compiler-plugin</artifactId>
+            <version>3.8.0</version>
+            <configuration>
+              <showWarnings>true</showWarnings>
+              <fork>true</fork> <!-- Required for JDK16+ -->
+              <compilerArgs combine.children="append">
+                <!--arg>-Werror</arg--> <!-- Disabled (temporarily?) -->
+                <arg>-Xlint:all</arg>
+                <arg>-XDcompilePolicy=simple</arg>
+                <arg>-Xplugin:ErrorProne</arg>
+                <!-- Following are required on JDK16+ -->
+                <arg>-J--add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED</arg>
+                <arg>-J--add-exports=jdk.compiler/com.sun.tools.javac.file=ALL-UNNAMED</arg>
+                <arg>-J--add-exports=jdk.compiler/com.sun.tools.javac.main=ALL-UNNAMED</arg>
+                <arg>-J--add-exports=jdk.compiler/com.sun.tools.javac.model=ALL-UNNAMED</arg>
+                <arg>-J--add-exports=jdk.compiler/com.sun.tools.javac.parser=ALL-UNNAMED</arg>
+                <arg>-J--add-exports=jdk.compiler/com.sun.tools.javac.processing=ALL-UNNAMED</arg>
+                <arg>-J--add-exports=jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED</arg>
+                <arg>-J--add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED</arg>
+                <arg>-J--add-opens=jdk.compiler/com.sun.tools.javac.code=ALL-UNNAMED</arg>
+                <arg>-J--add-opens=jdk.compiler/com.sun.tools.javac.comp=ALL-UNNAMED</arg>
+              </compilerArgs>
+              <annotationProcessorPaths combine.children="append">
+                <path>
+                  <groupId>com.google.errorprone</groupId>
+                  <artifactId>error_prone_core</artifactId>
+                  <version>${errorprone.version}</version>
+                </path>
+              </annotationProcessorPaths>
+            </configuration>
+          </plugin>
+        </plugins>
+      </build>
+    </profile>
   </profiles>
 
   <!-- http://central.sonatype.org/pages/requirements.html#developer-information -->

tensorflow-core/tensorflow-core-generator/pom.xml

@@ -59,11 +59,6 @@
           </archive>
         </configuration>
       </plugin>
-      <plugin>
-        <groupId>org.apache.maven.plugins</groupId>
-        <artifactId>maven-compiler-plugin</artifactId>
-        <version>3.8.0</version>
-      </plugin>
     </plugins>
   </build>
 </project>