jps: added method to get languageLevel for module

jps/model/src/org/jetbrains/jps/Module.groovy

@@ -24,6 +24,8 @@ class Module extends LazyInitializeableObject implements ClasspathItem {//}, Com
   Map<String, String> sourceRootPrefixes = [:]
   Map<String, Library> libraries = [:]
 
+  String languageLevel
+
   /*int compareTo(Object o) {
       if (o instanceof Module) {
           ((Module) o).name.compareTo(name);

jps/model/src/org/jetbrains/jps/ModuleChunk.groovy

@@ -69,6 +69,10 @@ class ModuleChunk extends DagNode<Module> {
     return representativeModule().project
   }
 
+  def String getLanguageLevel() {
+    return representativeModule().languageLevel
+  }
+
   public Module representativeModule() {
     return elements.iterator().next()
   }

jps/model/src/org/jetbrains/jps/idea/IdeaProjectLoader.groovy

@@ -197,7 +197,7 @@ public class IdeaProjectLoader {
 
     configuration.javacOptions.putAll(loadOptions(getComponent(root, "JavacSettings")))
 
-    def annotationProcessingTag = componentTag.annotationProcessing
+    def annotationProcessingTag = componentTag?.annotationProcessing
     if (annotationProcessingTag != null) {
       configuration.annotationProcessing.enabled = parseBoolean(annotationProcessingTag."@enabled", false)
       configuration.annotationProcessing.obtainProcessorsFromClasspath = parseBoolean(annotationProcessingTag."@useClasspath", true)
@@ -471,9 +471,7 @@ public class IdeaProjectLoader {
           languageLevel = projectLanguageLevel
         }
         if (languageLevel != null) {
-          def ll = convertLanguageLevel(languageLevel)
-          currentModule["sourceLevel"] = ll
-          currentModule["targetLevel"] = ll
+          currentModule.languageLevel = convertLanguageLevel(languageLevel)
         }
 
         if (srcFolderExists) {

jps/src/org/jetbrains/jps/builders/StandardBuilders.groovy

@@ -27,8 +27,8 @@ class JavacBuilder implements ModuleBuilder, ModuleCycleBuilder {
   def doBuildModule(ModuleChunk module, ModuleBuildState state, ProjectBuilder projectBuilder) {
     if (state.sourceRoots.isEmpty()) return;
 
-    String sourceLevel = module["sourceLevel"]
-    String targetLevel = module["targetLevel"]
+    String sourceLevel = module.languageLevel
+    String targetLevel = module.languageLevel
     String customArgs = module["javac_args"]; // it seems javac_args property is not set, can we drop it?
     if (projectBuilder.useInProcessJavac) {
       String version = System.getProperty("java.version")