cleanup and javadoc

jps/jps-builders/src/org/jetbrains/jps/incremental/Builder.java

@@ -1,14 +1,13 @@
 package org.jetbrains.jps.incremental;
 
 /**
+ * @see ModuleLevelBuilder
+ * @see ProjectLevelBuilder
+ *
  * @author nik
  */
 public abstract class Builder {
   public abstract String getName();
 
   public abstract String getDescription();
-
-  public static enum ExitCode {
-    OK, ABORT, ADDITIONAL_PASS_REQUIRED
-  }
 }

jps/jps-builders/src/org/jetbrains/jps/incremental/ProjectLevelBuilder.java

@@ -1,6 +1,7 @@
 package org.jetbrains.jps.incremental;
 
 /**
+ * @see ProjectLevelBuilderService
  * @author nik
  */
 public abstract class ProjectLevelBuilder extends Builder {

jps/jps-builders/src/org/jetbrains/jps/incremental/artifacts/IncArtifactBuilder.java

@@ -120,7 +120,7 @@ public class IncArtifactBuilder extends ProjectLevelBuilder {
       }
       context.processMessage(UptoDateFilesSavedEvent.INSTANCE);
     }
-    catch (Exception e) {
+    catch (IOException e) {
       throw new ProjectBuildException(e);
     }
   }