Set default id to java:exec plugin.

This also fixes a syntax error in pom.

Change-Id: Idd78d2e87ee8991fcb9183aeb5ad6b0acd837361
diff --git a/README.md b/README.md
index 8706fe1..a898bc1 100644
--- a/README.md
+++ b/README.md
@@ -28,15 +28,18 @@
    when the browser ask for authentication, select your `@gwtproject.org` account
 
 3. Compile the project so as resources are updated with latest doc, uploader is compiled,
-and tests run.
+and tests are run.
 
 ```
- mvn -q clean package
+ mvn clean package
 ```
 
 4. Upload the documentation to the web server in GAE
 
 ```
- mvn -q exec:java
+ mvn exec:java
 ```
 
+   If you wanted to upload to a different GAE instance, override the default one with the
+   `-Dappengine.instance=your-instance` parameter
+
diff --git a/pom.xml b/pom.xml
index 5d6d9c8..4664748 100644
--- a/pom.xml
+++ b/pom.xml
@@ -10,6 +10,8 @@
     <appengine.target.version>1.9.42</appengine.target.version>
     <appengine.instance>gwtproject-demo</appengine.instance>
     <website.folder>gwt-site-unpack</website.folder>
+    <maven.compiler.source>1.8</maven.compiler.source>
+    <maven.compiler.target>1.8</maven.compiler.target>
   </properties>
 
   <dependencies>
@@ -66,15 +68,6 @@
 
   <build>
     <plugins>
-      <plugin>
-        <groupId>org.apache.maven.plugins</groupId>
-        <version>2.5.1</version>
-        <artifactId>maven-compiler-plugin</artifactId>
-        <configuration>
-          <source>1.6</source>
-          <target>1.6</target>
-        </configuration>
-      </plugin>
 
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
@@ -102,20 +95,17 @@
         <version>1.6.0</version>
         <executions>
           <execution>
-            <goals>
-              <goal>java</goal>
-            </goals>
+            <id>default-cli</id>
+            <configuration>
+              <mainClass>com.google.gwt.site.uploader.Uploader</mainClass>
+              <arguments>
+                <argument>${project.build.directory}/${website.folder}</argument>
+                <argument>${appengine.instance}</argument>
+              </arguments>
+            </configuration>
           </execution>
-          <configuration>
-            <mainClass>com.google.gwt.site.uploader.Uploader</mainClass>
-            <arguments>
-              <argument>${project.build.directory}/${website.folder}</argument>
-              <argument>${appengine.instance}</argument>
-            </arguments>
-          </configuration>
         </executions>
       </plugin>
-
     </plugins>
   </build>
 </project>