fixing one errorprone error, ATM configure it to generate warning and not errors, let see if we can collect in jenkins

Signed-off-by: olivier lamy <olamy@webtide.com>

jetty-util/src/main/java/org/eclipse/jetty/util/PathWatcher.java

@@ -50,6 +50,7 @@ import java.util.Scanner;
 import java.util.concurrent.CopyOnWriteArrayList;
 import java.util.concurrent.TimeUnit;
 import java.util.function.Predicate;
+import java.util.stream.Stream;
 
 import org.eclipse.jetty.util.component.AbstractLifeCycle;
 import org.eclipse.jetty.util.log.Log;
@@ -1029,10 +1030,9 @@ public class PathWatcher extends AbstractLifeCycle implements Runnable
         register(dir,config);
         
         final MultiException me = new MultiException();
-        Files.list(dir).forEach(p->
-        {
-            if (LOG.isDebugEnabled())
-                LOG.debug("registerTree? {}",p);
+        try (Stream<Path> stream = Files.list( dir)) {
+            stream.forEach( p -> {
+                if ( LOG.isDebugEnabled() ) LOG.debug( "registerTree? {}", p );
 
                 try
                 {
@@ -1057,7 +1057,7 @@ public class PathWatcher extends AbstractLifeCycle implements Runnable
                     me.add( e );
                 }
             } );
-        
+        }
         try
         {
             me.ifExceptionThrow();

pom.xml

@@ -406,16 +406,20 @@
           <artifactId>maven-compiler-plugin</artifactId>
           <version>3.6.2</version>
           <configuration>
+            <showWarnings>true</showWarnings>
             <compilerId>javac-with-errorprone</compilerId>
             <forceJavacCompilerUse>true</forceJavacCompilerUse>
             <source>1.8</source>
             <target>1.8</target>
+            <compilerArgs>
+              <arg>-XepAllErrorsAsWarnings</arg>
+            </compilerArgs>
           </configuration>
           <dependencies>
             <dependency>
               <groupId>org.codehaus.plexus</groupId>
               <artifactId>plexus-compiler-javac-errorprone</artifactId>
-              <version>2.8</version>
+              <version>2.8.2</version>
             </dependency>
             <!-- override plexus-compiler-javac-errorprone's dependency on
                  Error Prone with the latest version -->