Fix for Netty wiring issue after 4.0 bump.

- After updating Netty 4.0 version,
  we sometimes see java.lang.NoClassDefFoundError: io/netty/util/internal/TypeParameterMatcher
  with backtrace insisting there's some dynamic class resolution inside Netty.

  It might be side-effect of recent native-epoll support inside karaf?
   https://github.com/netty/netty/issues/5119

- Add DynamicImport-Package for io.netty to allow deferred wiring
  http://felix.apache.org/documentation/tutorials-examples-and-presentations/apache-felix-osgi-faq.html#how-to-provide-optional-services
- Add a way to pass DynamicImport-Package on BUCK build

Change-Id: I50ec3400e940c56fb52563d84659ebb30c302235

@@ -103,6 +103,7 @@ def osgi_jar(
     description = '',
     debug = False,
     import_packages = '*',
+    dynamicimport_packages = '',
     export_packages = '*',
     package_name_root = 'org.onosproject',
     include_resources = NONE,
@@ -169,6 +170,7 @@ def osgi_jar(
            "'%s'" % export_packages,          #packages to export
            include_resources,                 #custom includes to classpath
            web_context,                       #web context (REST API only)
+           "'%s'" % dynamicimport_packages,   #DynamicImport-Package
            description,                       #description
           )
 

@@ -23,4 +23,5 @@ osgi_jar_with_tests (
     deps = COMPILE_DEPS,
     test_deps = TEST_DEPS,
     visibility = ['PUBLIC'],
+    dynamicimport_packages = 'io.netty.*',
 )

@@ -120,4 +120,23 @@
             <version>${netty4.version}</version>
         </dependency>
     </dependencies>
+
+    <build>
+        <plugins>
+
+            <plugin>
+                <groupId>org.apache.felix</groupId>
+                <artifactId>maven-bundle-plugin</artifactId>
+                <extensions>true</extensions>
+                <configuration>
+                    <instructions>
+                        <DynamicImport-Package>
+                            io.netty.*
+                        </DynamicImport-Package>
+                    </instructions>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
 </project>

@@ -64,6 +64,8 @@ public class OSGiWrapper {
     private String bundleVersion;
 
     private String importPackages;
+    private String dynamicimportPackages;
+
     private String exportPackages;
     private String includeResources;
     private Set<String> includedResources = Sets.newHashSet();
@@ -73,8 +75,9 @@ public class OSGiWrapper {
 
     private String webContext;
 
+    // FIXME should consider using Commons CLI, etc.
     public static void main(String[] args) {
-        if (args.length < 11) {
+        if (args.length < 12) {
             System.err.println("Not enough args");
             System.exit(1);
         }
@@ -90,14 +93,17 @@ public class OSGiWrapper {
         String exportPackages = args[8];
         String includeResources = args[9];
         String webContext = args[10];
-        String desc = Joiner.on(' ').join(Arrays.copyOfRange(args, 11, args.length));
+        String dynamicimportPackages = args[11];
+        String desc = Joiner.on(' ').join(Arrays.copyOfRange(args, 12, args.length));
 
         OSGiWrapper wrapper = new OSGiWrapper(jar, output, cp,
                                               name, group,
                                               version, license,
                                               importPackages, exportPackages,
                                               includeResources,
-                                              webContext, desc);
+                                              webContext,
+                                              dynamicimportPackages,
+                                              desc);
         wrapper.log(wrapper + "\n");
         if (!wrapper.execute()) {
             System.err.printf("Error generating %s\n", name);
@@ -117,6 +123,7 @@ public class OSGiWrapper {
                        String exportPackages,
                        String includeResources,
                        String webContext,
+                       String dynamicimportPackages,
                        String bundleDescription) {
         this.inputJar = inputJar;
         this.classpath = Lists.newArrayList(classpath.split(":"));
@@ -134,6 +141,10 @@ public class OSGiWrapper {
         this.bundleDescription = bundleDescription;
 
         this.importPackages = importPackages;
+        this.dynamicimportPackages = dynamicimportPackages;
+        if (Objects.equals(dynamicimportPackages, "''")) {
+            this.dynamicimportPackages = null;
+        }
         this.exportPackages = exportPackages;
         if (!Objects.equals(includeResources, NONE)) {
             this.includeResources = includeResources;
@@ -157,6 +168,8 @@ public class OSGiWrapper {
         // There are no good defaults so make sure you set the Import-Package
         analyzer.setProperty(Analyzer.IMPORT_PACKAGE, importPackages);
 
+        analyzer.setProperty(Analyzer.DYNAMICIMPORT_PACKAGE, dynamicimportPackages);
+
         // TODO include version in export, but not in import
         analyzer.setProperty(Analyzer.EXPORT_PACKAGE, exportPackages);
 
@@ -251,7 +264,7 @@ public class OSGiWrapper {
         analyzer.setBundleClasspath("WEB-INF/classes," +
                                     analyzer.getProperty(analyzer.BUNDLE_CLASSPATH));
 
-        Set<String> paths = new HashSet<String>(dot.getResources().keySet());
+        Set<String> paths = new HashSet<>(dot.getResources().keySet());
 
         for (String path : paths) {
             if (path.indexOf('/') > 0 && !Character.isUpperCase(path.charAt(0))) {