() {    final PropertyKey passwordKey = StructrApp.key(Principal.class, "password");   Principal tester0             = null;   Principal tester0             = null;   Principal tester0             = null;    try (final Tx tx = app.tx()) {     tester0 = app.create(Principal.class, new NodeAttribute<>(Principal.name, "tester0"), new NodeAttribute<>(passwordKey, "test"));    tester0 = app.create(Principal.class, new NodeAttribute<>(Principal.name, "tester0"), new NodeAttribute<>(passwordKey, "test"));    tester0 = app.create(Principal.class, new NodeAttribute<>(Principal.name, "tester0"), new NodeAttribute<>(passwordKey, "test"));     tx.success();    } catch (FrameworkException fex) {    fail("Unexpected exception.");   }     final SecurityContext ctx0 = SecurityContext.getInstance(tester0, AccessMode.Backend);   final SecurityContext ctx0 = SecurityContext.getInstance(tester0, AccessMode.Backend);   final SecurityContext ctx0 = SecurityContext.getInstance(tester0, AccessMode.Backend);    final App app0             = StructrApp.getInstance(ctx0);   final App app0             = StructrApp.getInstance(ctx0);   final App app0             = StructrApp.getInstance(ctx0);    try (final Tx tx = app0.tx()) {     FileHelper.createFolderPath(ctx0, "/Test0/data");     tx.success();    } catch (FrameworkException fex) {    fail("Unexpected exception.");   }    try (final Tx tx = app0.tx()) {     FileHelper.createFolderPath(ctx0, "/Test0/data");     tx.success();    } catch (FrameworkException fex) {    fail("Unexpected exception.");   }    try (final Tx tx = app0.tx()) {     FileHelper.createFolderPath(ctx0, "/Test0/data");     tx.success();    } catch (FrameworkException fex) {    fail("Unexpected exception.");   }    try (final Tx tx = app.tx()) {     System.out.println("############# Folders:");     