Add the 'compile' goal for 'compile-java9'

#4314 (comment)

Fixes #4314

COPYBARA_INTEGRATE_REVIEW=#4314 from cushon:module 604430d
PiperOrigin-RevId: 614276837

annotations/pom.xml

@@ -64,6 +64,9 @@
           </execution>
           <execution>
             <id>compile-java9</id>
+            <goals>
+              <goal>compile</goal>
+            </goals>
             <configuration>
               <source>9</source>
               <target>9</target>
@@ -82,6 +85,9 @@
               <Multi-Release>true</Multi-Release>
             </manifestEntries>
           </archive>
+          <excludes>
+            <exclude>/META-INF/versions/9/com/**/*.class</exclude>
+          </excludes>
         </configuration>
       </plugin>
     </plugins>

annotations/src/main/java/module-info.java

@@ -15,7 +15,6 @@
  */
 
 open module com.google.errorprone.annotation {
-  requires java.base;
   requires java.compiler;
 
   exports com.google.errorprone.annotations;

pom.xml

@@ -150,9 +150,10 @@
               <bnd><![CDATA[
                 Bundle-SymbolicName: com.google.$<replacestring;$<replacestring;${project.artifactId};^error_prone;errorprone>;_;.>
                 Automatic-Module-Name: $<Bundle-SymbolicName>
-                -exportcontents: com.google.errorprone*
+                -exportcontents: com.google.errorprone*,!META-INF.*
                 -noextraheaders: true
                 -removeheaders: Private-Package
+                -fixupmessages: ^Classes found in the wrong directory: .*
               ]]></bnd>
             </configuration>
           </execution>