Fix exception when there is a non-configured library

idea/src/org/jetbrains/jet/plugin/configuration/KotlinWithLibraryConfigurator.java

@@ -59,7 +59,7 @@ public abstract class KotlinWithLibraryConfigurator implements KotlinProjectConf
             @NotNull Module module,
             @NotNull LibraryState libraryState,
             @NotNull FileState jarState,
-            @Nullable String dirWithJar
+            @NotNull String dirToCopyJarTo
     ) {
         Project project = module.getProject();
 
@@ -70,13 +70,7 @@ public abstract class KotlinWithLibraryConfigurator implements KotlinProjectConf
                         break;
                     }
                     case COPY: {
-                        String pathToJarFromLibrary = getPathToJarFromLibrary(project);
-                        if (pathToJarFromLibrary != null) {
-                            copyJarToDir(pathToJarFromLibrary);
-                        }
-                        else {
-                            showError("Cannot copy jar to root for " + getLibraryName() + " library");
-                        }
+                        copyJarToDir(dirToCopyJarTo);
                         break;
                     }
                     case DO_NOT_COPY: {
@@ -88,14 +82,11 @@ public abstract class KotlinWithLibraryConfigurator implements KotlinProjectConf
             case NON_CONFIGURED_LIBRARY:
                 switch (jarState) {
                     case EXISTS: {
-                        assert dirWithJar !=
-                               null : "Jar file exists, so dirWithJar must be non-null: should be default path to lib directory";
-                        addJarToExistedLibrary(project, getJarFile(dirWithJar));
+                        addJarToExistedLibrary(project, getJarFile(dirToCopyJarTo));
                         break;
                     }
                     case COPY: {
-                        assert dirWithJar != null : "Path to copy should be visible in configuration dialog and must be non-null";
-                        File file = copyJarToDir(dirWithJar);
+                        File file = copyJarToDir(dirToCopyJarTo);
                         addJarToExistedLibrary(project, file);
                         break;
                     }
@@ -108,14 +99,11 @@ public abstract class KotlinWithLibraryConfigurator implements KotlinProjectConf
             case NEW_LIBRARY:
                 switch (jarState) {
                     case EXISTS: {
-                        assert dirWithJar !=
-                               null : "Jar file exists, so dirWithJar must be non-null: should be default path to lib directory";
-                        addJarToNewLibrary(project, getJarFile(dirWithJar));
+                        addJarToNewLibrary(project, getJarFile(dirToCopyJarTo));
                         break;
                     }
                     case COPY: {
-                        assert dirWithJar != null : "Path to copy should be visible in configuration dialog and must be non-null";
-                        File file = copyJarToDir(dirWithJar);
+                        File file = copyJarToDir(dirToCopyJarTo);
                         addJarToNewLibrary(project, file);
                         break;
                     }
@@ -171,7 +159,7 @@ public abstract class KotlinWithLibraryConfigurator implements KotlinProjectConf
 
         FileState runtimeState = getJarState(project, defaultPath, pathFromDialog);
         LibraryState libraryState = getLibraryState(project);
-        String dirToCopyJar = isJarPresent(defaultPath) ? defaultPath : pathFromDialog;
+        String dirToCopyJar = getPathToCopyFileTo(project, defaultPath, pathFromDialog);
 
         configureModuleWithLibrary(module, libraryState, runtimeState, dirToCopyJar);
     }
@@ -315,6 +303,9 @@ public abstract class KotlinWithLibraryConfigurator implements KotlinProjectConf
                 (pathFormLibrary != null && getJarFile(pathFormLibrary).exists())) {
             return FileState.EXISTS;
         }
+        else if (pathFormLibrary != null) {
+            return FileState.COPY;
+        }
         else if (pathFromDialog == null) {
             return FileState.DO_NOT_COPY;
         }
@@ -323,6 +314,22 @@ public abstract class KotlinWithLibraryConfigurator implements KotlinProjectConf
         }
     }
 
+    @NotNull
+    private String getPathToCopyFileTo(
+            @NotNull Project project,
+            @NotNull String defaultDir,
+            @Nullable String pathFromDialog
+    ) {
+        if (pathFromDialog != null) {
+            return pathFromDialog;
+        }
+        String pathFormLibrary = getPathToJarFromLibrary(project);
+        if (pathFormLibrary != null) {
+            return pathFormLibrary;
+        }
+        return defaultDir;
+    }
+
     KotlinWithLibraryConfigurator() {
     }
 }

idea/tests/org/jetbrains/jet/plugin/configuration/ConfigureKotlinTest.java

@@ -140,7 +140,7 @@ public class ConfigureKotlinTest extends PlatformTestCase {
         }
     }
 
-    @Nullable
+    @NotNull
     private static String getPathToJar(@NotNull FileState runtimeState, @NotNull String jarFromDist, @NotNull String jarFromTemp) {
         switch (runtimeState) {
             case EXISTS:
@@ -148,9 +148,9 @@ public class ConfigureKotlinTest extends PlatformTestCase {
             case COPY:
                 return jarFromTemp;
             case DO_NOT_COPY:
-                return null;
+                return jarFromDist;
         }
-        return null;
+        return jarFromDist;
     }
 
     private static void configure(@NotNull Module module, @NotNull FileState jarState, @NotNull LibraryState libraryState, @NotNull KotlinProjectConfigurator configurator) {