diff --git a/.idea/codeStyles/Project.xml b/.idea/codeStyles/Project.xml
index 22aa80cae..642d980d4 100644
--- a/.idea/codeStyles/Project.xml
+++ b/.idea/codeStyles/Project.xml
@@ -36,6 +36,9 @@
       <option name="JD_ALIGN_PARAM_COMMENTS" value="false" />
       <option name="JD_ALIGN_EXCEPTION_COMMENTS" value="false" />
     </JavaCodeStyleSettings>
+    <JetCodeStyleSettings>
+      <option name="CODE_STYLE_DEFAULTS" value="KOTLIN_OFFICIAL" />
+    </JetCodeStyleSettings>
     <Objective-C-extensions>
       <file>
         <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Import" />
@@ -258,14 +261,10 @@
       </arrangement>
     </codeStyleSettings>
     <codeStyleSettings language="kotlin">
-      <option name="CALL_PARAMETERS_WRAP" value="1" />
-      <option name="METHOD_PARAMETERS_WRAP" value="1" />
-      <option name="EXTENDS_LIST_WRAP" value="1" />
-      <option name="METHOD_CALL_CHAIN_WRAP" value="1" />
-      <option name="ASSIGNMENT_WRAP" value="1" />
+      <option name="CODE_STYLE_DEFAULTS" value="KOTLIN_OFFICIAL" />
       <option name="PARAMETER_ANNOTATION_WRAP" value="1" />
       <option name="VARIABLE_ANNOTATION_WRAP" value="1" />
       <option name="ENUM_CONSTANTS_WRAP" value="1" />
     </codeStyleSettings>
   </code_scheme>
-</component>
+</component>
\ No newline at end of file
diff --git a/briar-headless/build.gradle b/briar-headless/build.gradle
index c6fbc5e6c..b615fb419 100644
--- a/briar-headless/build.gradle
+++ b/briar-headless/build.gradle
@@ -14,11 +14,12 @@ dependencies {
 	implementation project(path: ':briar-core', configuration: 'default')
 	implementation project(path: ':bramble-java', configuration: 'default')
 
-	implementation 'io.javalin:javalin:1.7.0'
+	implementation 'io.javalin:javalin:2.1.0'
 	implementation 'org.slf4j:slf4j-simple:1.7.25'
 	implementation 'com.fasterxml.jackson.core:jackson-databind:2.9.6'
 
 	apt 'com.google.dagger:dagger-compiler:2.0.2'
+	kapt 'com.google.dagger:dagger-compiler:2.0.2'
 
 	testImplementation project(path: ':bramble-api', configuration: 'testOutput')
 	testImplementation project(path: ':bramble-core', configuration: 'testOutput')
diff --git a/briar-headless/src/main/java/org/briarproject/bramble/identity/OutputAuthor.java b/briar-headless/src/main/java/org/briarproject/bramble/identity/OutputAuthor.java
deleted file mode 100644
index d093398b9..000000000
--- a/briar-headless/src/main/java/org/briarproject/bramble/identity/OutputAuthor.java
+++ /dev/null
@@ -1,23 +0,0 @@
-package org.briarproject.bramble.identity;
-
-import org.briarproject.bramble.api.identity.Author;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
-import javax.annotation.concurrent.Immutable;
-
-@Immutable
-@NotNullByDefault
-@SuppressWarnings("WeakerAccess")
-public class OutputAuthor {
-
-	public final byte[] id;
-	public final String name;
-	public final byte[] publicKey;
-
-	public OutputAuthor(Author author) {
-		this.id = author.getId().getBytes();
-		this.name = author.getName();
-		this.publicKey = author.getPublicKey();
-	}
-
-}
diff --git a/briar-headless/src/main/java/org/briarproject/bramble/identity/OutputAuthor.kt b/briar-headless/src/main/java/org/briarproject/bramble/identity/OutputAuthor.kt
new file mode 100644
index 000000000..020de0fdd
--- /dev/null
+++ b/briar-headless/src/main/java/org/briarproject/bramble/identity/OutputAuthor.kt
@@ -0,0 +1,14 @@
+package org.briarproject.bramble.identity
+
+import org.briarproject.bramble.api.identity.Author
+import javax.annotation.concurrent.Immutable
+
+@Immutable
+@Suppress("unused")
+class OutputAuthor(author: Author) {
+
+    val id: ByteArray = author.id.bytes
+    val name: String = author.name
+    val publicKey: ByteArray = author.publicKey
+
+}
diff --git a/briar-headless/src/main/java/org/briarproject/briar/headless/Extensions.kt b/briar-headless/src/main/java/org/briarproject/briar/headless/Extensions.kt
new file mode 100644
index 000000000..9aa992271
--- /dev/null
+++ b/briar-headless/src/main/java/org/briarproject/briar/headless/Extensions.kt
@@ -0,0 +1,12 @@
+package org.briarproject.briar.headless
+
+import org.briarproject.bramble.api.identity.Author
+import org.briarproject.bramble.identity.OutputAuthor
+import org.briarproject.briar.api.blog.MessageType
+
+fun Author.output() = OutputAuthor(this)
+
+fun Author.Status.output() = name.toLowerCase()
+
+fun MessageType.output() = name.toLowerCase()
+
diff --git a/briar-headless/src/main/java/org/briarproject/briar/headless/Router.java b/briar-headless/src/main/java/org/briarproject/briar/headless/Router.java
deleted file mode 100644
index ff65063f1..000000000
--- a/briar-headless/src/main/java/org/briarproject/briar/headless/Router.java
+++ /dev/null
@@ -1,79 +0,0 @@
-package org.briarproject.briar.headless;
-
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.briar.headless.blogs.BlogController;
-import org.briarproject.briar.headless.contact.ContactController;
-import org.briarproject.briar.headless.forums.ForumController;
-import org.briarproject.briar.headless.messaging.MessagingController;
-
-import javax.annotation.ParametersAreNonnullByDefault;
-import javax.annotation.concurrent.Immutable;
-import javax.inject.Inject;
-import javax.inject.Singleton;
-
-import io.javalin.Javalin;
-
-import static io.javalin.ApiBuilder.get;
-import static io.javalin.ApiBuilder.path;
-import static io.javalin.ApiBuilder.post;
-import static io.javalin.event.EventType.SERVER_START_FAILED;
-import static io.javalin.event.EventType.SERVER_STOPPED;
-import static java.lang.Runtime.getRuntime;
-
-@Immutable
-@Singleton
-@MethodsNotNullByDefault
-@ParametersAreNonnullByDefault
-public class Router {
-
-	private final BriarService briarService;
-	private final ContactController contactController;
-	private final MessagingController messagingController;
-	private final ForumController forumController;
-	private final BlogController blogController;
-
-	@Inject
-	public Router(BriarService briarService,
-			ContactController contactController,
-			MessagingController messagingController,
-			ForumController forumController,
-			BlogController blogController) {
-		this.briarService = briarService;
-		this.contactController = contactController;
-		this.messagingController = messagingController;
-		this.forumController = forumController;
-		this.blogController = blogController;
-	}
-
-	public void start() {
-		briarService.start();
-		getRuntime().addShutdownHook(new Thread(briarService::stop));
-
-		Javalin app = Javalin.create()
-				.port(7000)
-				.disableStartupBanner()
-				.enableStandardRequestLogging()
-				.enableRouteOverview("/")
-				.enableDynamicGzip()
-				.event(SERVER_START_FAILED, event -> briarService.stop())
-				.event(SERVER_STOPPED, event -> briarService.stop())
-				.start();
-
-		app.routes(() -> {
-			path("/contacts", () -> get(contactController::list));
-			path("/messages/:contactId", () -> {
-				get(messagingController::list);
-				post(messagingController::write);
-			});
-			path("/forums", () -> {
-				get(forumController::list);
-				post(forumController::create);
-			});
-			path("/blogs", () -> path("/posts", () -> {
-				get(blogController::listPosts);
-				post(blogController::createPost);
-			}));
-		});
-	}
-
-}
diff --git a/briar-headless/src/main/java/org/briarproject/briar/headless/Router.kt b/briar-headless/src/main/java/org/briarproject/briar/headless/Router.kt
new file mode 100644
index 000000000..de23453c2
--- /dev/null
+++ b/briar-headless/src/main/java/org/briarproject/briar/headless/Router.kt
@@ -0,0 +1,68 @@
+package org.briarproject.briar.headless
+
+import io.javalin.Javalin
+import io.javalin.JavalinEvent.SERVER_START_FAILED
+import io.javalin.JavalinEvent.SERVER_STOPPED
+import io.javalin.apibuilder.ApiBuilder.*
+import org.briarproject.briar.headless.blogs.BlogController
+import org.briarproject.briar.headless.contact.ContactController
+import org.briarproject.briar.headless.forums.ForumController
+import org.briarproject.briar.headless.messaging.MessagingController
+import java.lang.Runtime.getRuntime
+import javax.annotation.concurrent.Immutable
+import javax.inject.Inject
+import javax.inject.Singleton
+import kotlin.system.exitProcess
+
+@Immutable
+@Singleton
+class Router @Inject
+constructor(
+    private val briarService: BriarService,
+    private val contactController: ContactController,
+    private val messagingController: MessagingController,
+    private val forumController: ForumController,
+    private val blogController: BlogController
+) {
+
+    fun start() {
+        briarService.start()
+        getRuntime().addShutdownHook(Thread(Runnable { briarService.stop() }))
+
+        val app = Javalin.create()
+            .port(7000)
+            .disableStartupBanner()
+            .enableDebugLogging()
+            .enableCaseSensitiveUrls()
+            .enableRouteOverview("/")
+            .event(SERVER_START_FAILED) { stop() }
+            .event(SERVER_STOPPED) { stop() }
+            .start()
+
+        app.routes {
+            path("/contacts") {
+                get { ctx -> contactController.list(ctx) }
+            }
+            path("/messages/:contactId") {
+                get { ctx -> messagingController.list(ctx) }
+                post { ctx -> messagingController.write(ctx) }
+            }
+            path("/forums") {
+                get { ctx -> forumController.list(ctx) }
+                post { ctx -> forumController.create(ctx) }
+            }
+            path("/blogs") {
+                path("/posts") {
+                    get { ctx -> blogController.listPosts(ctx) }
+                    post { ctx -> blogController.createPost(ctx) }
+                }
+            }
+        }
+    }
+
+    private fun stop() {
+        briarService.stop()
+        exitProcess(1)
+    }
+
+}
diff --git a/briar-headless/src/main/java/org/briarproject/briar/headless/blogs/BlogController.java b/briar-headless/src/main/java/org/briarproject/briar/headless/blogs/BlogController.java
deleted file mode 100644
index 358e0f6b1..000000000
--- a/briar-headless/src/main/java/org/briarproject/briar/headless/blogs/BlogController.java
+++ /dev/null
@@ -1,81 +0,0 @@
-package org.briarproject.briar.headless.blogs;
-
-import org.briarproject.bramble.api.FormatException;
-import org.briarproject.bramble.api.db.DbException;
-import org.briarproject.bramble.api.identity.IdentityManager;
-import org.briarproject.bramble.api.identity.LocalAuthor;
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.system.Clock;
-import org.briarproject.briar.api.blog.Blog;
-import org.briarproject.briar.api.blog.BlogManager;
-import org.briarproject.briar.api.blog.BlogPost;
-import org.briarproject.briar.api.blog.BlogPostFactory;
-import org.briarproject.briar.api.blog.BlogPostHeader;
-
-import java.security.GeneralSecurityException;
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.List;
-
-import javax.annotation.ParametersAreNonnullByDefault;
-import javax.annotation.concurrent.Immutable;
-import javax.inject.Inject;
-import javax.inject.Singleton;
-
-import io.javalin.Context;
-
-@Immutable
-@Singleton
-@MethodsNotNullByDefault
-@ParametersAreNonnullByDefault
-public class BlogController {
-
-	private final BlogManager blogManager;
-	private final BlogPostFactory blogPostFactory;
-	private final IdentityManager identityManager;
-	private final Clock clock;
-
-	@Inject
-	public BlogController(BlogManager blogManager,
-			BlogPostFactory blogPostFactory, IdentityManager identityManager,
-			Clock clock) {
-		this.blogManager = blogManager;
-		this.blogPostFactory = blogPostFactory;
-		this.identityManager = identityManager;
-		this.clock = clock;
-	}
-
-	public Context listPosts(Context ctx) throws DbException {
-		List<OutputBlogPost> posts = new ArrayList<>();
-		for (Blog b : blogManager.getBlogs()) {
-			Collection<BlogPostHeader> headers =
-					blogManager.getPostHeaders(b.getId());
-			for (BlogPostHeader header : headers) {
-				String body = blogManager.getPostBody(header.getId());
-				OutputBlogPost post = new OutputBlogPost(header, body);
-				posts.add(post);
-			}
-		}
-		return ctx.json(posts);
-	}
-
-	public Context createPost(Context ctx)
-			throws DbException, GeneralSecurityException, FormatException {
-		String text = ctx.formParam("text");
-		if (text == null || text.length() < 1) {
-			return ctx.status(500).result("Expecting Blog text");
-		} else {
-			LocalAuthor author = identityManager.getLocalAuthor();
-			Blog blog = blogManager.getPersonalBlog(author);
-			long now = clock.currentTimeMillis();
-			BlogPost post = blogPostFactory
-					.createBlogPost(blog.getId(), now, null, author, text);
-			blogManager.addLocalPost(post);
-			BlogPostHeader header = blogManager
-					.getPostHeader(blog.getId(), post.getMessage().getId());
-			OutputBlogPost outputPost = new OutputBlogPost(header, text);
-			return ctx.json(outputPost);
-		}
-	}
-
-}
diff --git a/briar-headless/src/main/java/org/briarproject/briar/headless/blogs/BlogController.kt b/briar-headless/src/main/java/org/briarproject/briar/headless/blogs/BlogController.kt
new file mode 100644
index 000000000..4b8ccb144
--- /dev/null
+++ b/briar-headless/src/main/java/org/briarproject/briar/headless/blogs/BlogController.kt
@@ -0,0 +1,47 @@
+package org.briarproject.briar.headless.blogs
+
+import io.javalin.BadRequestResponse
+import io.javalin.Context
+import org.briarproject.bramble.api.identity.IdentityManager
+import org.briarproject.bramble.api.system.Clock
+import org.briarproject.briar.api.blog.BlogManager
+import org.briarproject.briar.api.blog.BlogPostFactory
+import javax.annotation.concurrent.Immutable
+import javax.inject.Inject
+import javax.inject.Singleton
+
+@Immutable
+@Singleton
+class BlogController @Inject
+constructor(
+    private val blogManager: BlogManager,
+    private val blogPostFactory: BlogPostFactory,
+    private val identityManager: IdentityManager,
+    private val clock: Clock
+) {
+
+    fun listPosts(ctx: Context): Context {
+        val posts = blogManager.blogs.flatMap { blog ->
+            blogManager.getPostHeaders(blog.id).map { header ->
+                val body = blogManager.getPostBody(header.id)
+                header.output(body)
+            }
+        }
+        return ctx.json(posts)
+    }
+
+    fun createPost(ctx: Context): Context {
+        val text = ctx.formParam("text")
+        if (text == null || text.isEmpty())
+            throw BadRequestResponse("Expecting Blog text")
+
+        val author = identityManager.localAuthor
+        val blog = blogManager.getPersonalBlog(author)
+        val now = clock.currentTimeMillis()
+        val post = blogPostFactory.createBlogPost(blog.id, now, null, author, text)
+        blogManager.addLocalPost(post)
+        val header = blogManager.getPostHeader(blog.id, post.message.id)
+        return ctx.json(header.output(text))
+    }
+
+}
diff --git a/briar-headless/src/main/java/org/briarproject/briar/headless/blogs/Extensions.kt b/briar-headless/src/main/java/org/briarproject/briar/headless/blogs/Extensions.kt
new file mode 100644
index 000000000..eccf60201
--- /dev/null
+++ b/briar-headless/src/main/java/org/briarproject/briar/headless/blogs/Extensions.kt
@@ -0,0 +1,5 @@
+package org.briarproject.briar.headless.blogs
+
+import org.briarproject.briar.api.blog.BlogPostHeader
+
+internal fun BlogPostHeader.output(body: String) = OutputBlogPost(this, body)
diff --git a/briar-headless/src/main/java/org/briarproject/briar/headless/blogs/OutputBlogPost.java b/briar-headless/src/main/java/org/briarproject/briar/headless/blogs/OutputBlogPost.java
deleted file mode 100644
index f1dd2a8a9..000000000
--- a/briar-headless/src/main/java/org/briarproject/briar/headless/blogs/OutputBlogPost.java
+++ /dev/null
@@ -1,38 +0,0 @@
-package org.briarproject.briar.headless.blogs;
-
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.identity.OutputAuthor;
-import org.briarproject.briar.api.blog.BlogPostHeader;
-
-import javax.annotation.Nullable;
-import javax.annotation.concurrent.Immutable;
-
-@Immutable
-@NotNullByDefault
-@SuppressWarnings("WeakerAccess")
-class OutputBlogPost {
-
-	public final String body;
-	public final OutputAuthor author;
-	public final String authorStatus, type;
-	public final byte[] id;
-	@Nullable
-	public final byte[] parentId;
-	public final boolean read, rssFeed;
-	public final long timestamp, timestampReceived;
-
-	OutputBlogPost(BlogPostHeader header, String body) {
-		this.body = body;
-		this.author = new OutputAuthor(header.getAuthor());
-		this.authorStatus = header.getAuthorStatus().name().toLowerCase();
-		this.type = header.getType().name().toLowerCase();
-		this.id = header.getId().getBytes();
-		this.parentId = header.getParentId() == null ? null :
-				header.getParentId().getBytes();
-		this.read = header.isRead();
-		this.rssFeed = header.isRssFeed();
-		this.timestamp = header.getTimestamp();
-		this.timestampReceived = header.getTimeReceived();
-	}
-
-}
diff --git a/briar-headless/src/main/java/org/briarproject/briar/headless/blogs/OutputBlogPost.kt b/briar-headless/src/main/java/org/briarproject/briar/headless/blogs/OutputBlogPost.kt
new file mode 100644
index 000000000..433e52128
--- /dev/null
+++ b/briar-headless/src/main/java/org/briarproject/briar/headless/blogs/OutputBlogPost.kt
@@ -0,0 +1,22 @@
+package org.briarproject.briar.headless.blogs
+
+import org.briarproject.bramble.identity.OutputAuthor
+import org.briarproject.briar.api.blog.BlogPostHeader
+import org.briarproject.briar.headless.output
+import javax.annotation.concurrent.Immutable
+
+@Immutable
+@Suppress("unused")
+internal class OutputBlogPost(header: BlogPostHeader, val body: String) {
+
+    val author: OutputAuthor = OutputAuthor(header.author)
+    val authorStatus: String = header.authorStatus.output()
+    val type = header.type.output()
+    val id: ByteArray = header.id.bytes
+    val parentId = header.parentId?.bytes
+    val read = header.isRead
+    val rssFeed = header.isRssFeed
+    val timestamp = header.timestamp
+    val timestampReceived = header.timeReceived
+
+}
diff --git a/briar-headless/src/main/java/org/briarproject/briar/headless/contact/ContactController.java b/briar-headless/src/main/java/org/briarproject/briar/headless/contact/ContactController.java
deleted file mode 100644
index 8c2be33ea..000000000
--- a/briar-headless/src/main/java/org/briarproject/briar/headless/contact/ContactController.java
+++ /dev/null
@@ -1,39 +0,0 @@
-package org.briarproject.briar.headless.contact;
-
-import org.briarproject.bramble.api.contact.Contact;
-import org.briarproject.bramble.api.contact.ContactManager;
-import org.briarproject.bramble.api.db.DbException;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.List;
-
-import javax.annotation.concurrent.Immutable;
-import javax.inject.Inject;
-import javax.inject.Singleton;
-
-import io.javalin.Context;
-
-@Immutable
-@Singleton
-@NotNullByDefault
-public class ContactController {
-
-	private final ContactManager contactManager;
-
-	@Inject
-	public ContactController(ContactManager contactManager) {
-		this.contactManager = contactManager;
-	}
-
-	public Context list(Context ctx) throws DbException {
-		Collection<Contact> contacts = contactManager.getActiveContacts();
-		List<OutputContact> outputContacts = new ArrayList<>(contacts.size());
-		for (Contact c : contacts) {
-			outputContacts.add(new OutputContact(c));
-		}
-		return ctx.json(outputContacts);
-	}
-
-}
diff --git a/briar-headless/src/main/java/org/briarproject/briar/headless/contact/ContactController.kt b/briar-headless/src/main/java/org/briarproject/briar/headless/contact/ContactController.kt
new file mode 100644
index 000000000..1de72d5c9
--- /dev/null
+++ b/briar-headless/src/main/java/org/briarproject/briar/headless/contact/ContactController.kt
@@ -0,0 +1,21 @@
+package org.briarproject.briar.headless.contact
+
+import io.javalin.Context
+import org.briarproject.bramble.api.contact.ContactManager
+import javax.annotation.concurrent.Immutable
+import javax.inject.Inject
+import javax.inject.Singleton
+
+@Immutable
+@Singleton
+class ContactController @Inject
+constructor(private val contactManager: ContactManager) {
+
+    fun list(ctx: Context): Context {
+        val contacts = contactManager.activeContacts.map { contact ->
+            contact.output()
+        }
+        return ctx.json(contacts)
+    }
+
+}
diff --git a/briar-headless/src/main/java/org/briarproject/briar/headless/contact/Extensions.kt b/briar-headless/src/main/java/org/briarproject/briar/headless/contact/Extensions.kt
new file mode 100644
index 000000000..ed90d3c04
--- /dev/null
+++ b/briar-headless/src/main/java/org/briarproject/briar/headless/contact/Extensions.kt
@@ -0,0 +1,5 @@
+package org.briarproject.briar.headless.contact
+
+import org.briarproject.bramble.api.contact.Contact
+
+internal fun Contact.output() = OutputContact(this)
diff --git a/briar-headless/src/main/java/org/briarproject/briar/headless/contact/OutputContact.java b/briar-headless/src/main/java/org/briarproject/briar/headless/contact/OutputContact.java
deleted file mode 100644
index b5a026a0f..000000000
--- a/briar-headless/src/main/java/org/briarproject/briar/headless/contact/OutputContact.java
+++ /dev/null
@@ -1,24 +0,0 @@
-package org.briarproject.briar.headless.contact;
-
-import org.briarproject.bramble.api.contact.Contact;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.identity.OutputAuthor;
-
-import javax.annotation.concurrent.Immutable;
-
-@Immutable
-@NotNullByDefault
-@SuppressWarnings("WeakerAccess")
-public class OutputContact {
-
-	public final int id;
-	public final OutputAuthor author;
-	public final boolean verified;
-
-	public OutputContact(Contact c) {
-		this.id = c.getId().getInt();
-		this.author = new OutputAuthor(c.getAuthor());
-		this.verified = c.isVerified();
-	}
-
-}
diff --git a/briar-headless/src/main/java/org/briarproject/briar/headless/contact/OutputContact.kt b/briar-headless/src/main/java/org/briarproject/briar/headless/contact/OutputContact.kt
new file mode 100644
index 000000000..6c3662297
--- /dev/null
+++ b/briar-headless/src/main/java/org/briarproject/briar/headless/contact/OutputContact.kt
@@ -0,0 +1,15 @@
+package org.briarproject.briar.headless.contact
+
+import org.briarproject.bramble.api.contact.Contact
+import org.briarproject.briar.headless.output
+import javax.annotation.concurrent.Immutable
+
+@Immutable
+@Suppress("unused")
+internal class OutputContact(c: Contact) {
+
+    val id = c.id.int
+    val author = c.author.output()
+    val verified = c.isVerified
+
+}
diff --git a/briar-headless/src/main/java/org/briarproject/briar/headless/forums/Extensions.kt b/briar-headless/src/main/java/org/briarproject/briar/headless/forums/Extensions.kt
new file mode 100644
index 000000000..6c1d38cfa
--- /dev/null
+++ b/briar-headless/src/main/java/org/briarproject/briar/headless/forums/Extensions.kt
@@ -0,0 +1,7 @@
+package org.briarproject.briar.headless.forums
+
+import org.briarproject.briar.api.forum.Forum
+
+internal fun Forum.output() = OutputForum(this)
+
+internal fun Collection<Forum>.output() = map { it.output() }
diff --git a/briar-headless/src/main/java/org/briarproject/briar/headless/forums/ForumController.java b/briar-headless/src/main/java/org/briarproject/briar/headless/forums/ForumController.java
deleted file mode 100644
index 483b98d02..000000000
--- a/briar-headless/src/main/java/org/briarproject/briar/headless/forums/ForumController.java
+++ /dev/null
@@ -1,47 +0,0 @@
-package org.briarproject.briar.headless.forums;
-
-import org.briarproject.bramble.api.db.DbException;
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.briar.api.forum.Forum;
-import org.briarproject.briar.api.forum.ForumManager;
-
-import java.util.Collection;
-
-import javax.annotation.ParametersAreNonnullByDefault;
-import javax.annotation.concurrent.Immutable;
-import javax.inject.Inject;
-import javax.inject.Singleton;
-
-import io.javalin.Context;
-
-import static io.javalin.translator.json.JavalinJsonPlugin.getObjectToJsonMapper;
-
-@Immutable
-@Singleton
-@MethodsNotNullByDefault
-@ParametersAreNonnullByDefault
-public class ForumController {
-
-	private final ForumManager forumManager;
-
-	@Inject
-	public ForumController(ForumManager forumManager) {
-		this.forumManager = forumManager;
-	}
-
-	public Context list(Context ctx) throws DbException {
-		Collection<Forum> forums = forumManager.getForums();
-		return ctx.result(getObjectToJsonMapper().map(forums));
-	}
-
-	public Context create(Context ctx) throws DbException {
-		String name = ctx.formParam("name");
-		if (name == null || name.length() < 1) {
-			return ctx.status(500).result("Expecting Forum Name");
-		} else {
-			Forum forum = forumManager.addForum(name);
-			return ctx.result(getObjectToJsonMapper().map(forum));
-		}
-	}
-
-}
diff --git a/briar-headless/src/main/java/org/briarproject/briar/headless/forums/ForumController.kt b/briar-headless/src/main/java/org/briarproject/briar/headless/forums/ForumController.kt
new file mode 100644
index 000000000..52d6a06c7
--- /dev/null
+++ b/briar-headless/src/main/java/org/briarproject/briar/headless/forums/ForumController.kt
@@ -0,0 +1,26 @@
+package org.briarproject.briar.headless.forums
+
+import io.javalin.BadRequestResponse
+import io.javalin.Context
+import org.briarproject.briar.api.forum.ForumManager
+import javax.annotation.concurrent.Immutable
+import javax.inject.Inject
+import javax.inject.Singleton
+
+@Immutable
+@Singleton
+class ForumController @Inject
+constructor(private val forumManager: ForumManager) {
+
+    fun list(ctx: Context): Context {
+        return ctx.json(forumManager.forums.output())
+    }
+
+    fun create(ctx: Context): Context {
+        val name = ctx.formParam("name")
+        if (name == null || name.isEmpty())
+            throw BadRequestResponse("Expecting Forum Name")
+        return ctx.json(forumManager.addForum(name).output())
+    }
+
+}
diff --git a/briar-headless/src/main/java/org/briarproject/briar/headless/forums/OutputForum.kt b/briar-headless/src/main/java/org/briarproject/briar/headless/forums/OutputForum.kt
new file mode 100644
index 000000000..0066ab5cf
--- /dev/null
+++ b/briar-headless/src/main/java/org/briarproject/briar/headless/forums/OutputForum.kt
@@ -0,0 +1,13 @@
+package org.briarproject.briar.headless.forums
+
+import org.briarproject.briar.api.forum.Forum
+import javax.annotation.concurrent.Immutable
+
+@Immutable
+@Suppress("unused")
+internal class OutputForum(forum: Forum) {
+
+    val name: String = forum.name
+    val id: ByteArray = forum.id.bytes
+
+}
diff --git a/briar-headless/src/main/java/org/briarproject/briar/headless/messaging/Extensions.kt b/briar-headless/src/main/java/org/briarproject/briar/headless/messaging/Extensions.kt
new file mode 100644
index 000000000..f2d5bc248
--- /dev/null
+++ b/briar-headless/src/main/java/org/briarproject/briar/headless/messaging/Extensions.kt
@@ -0,0 +1,8 @@
+package org.briarproject.briar.headless.messaging
+
+import org.briarproject.briar.api.messaging.PrivateMessage
+import org.briarproject.briar.api.messaging.PrivateMessageHeader
+
+internal fun PrivateMessageHeader.output(body: String) = OutputPrivateMessage(this, body)
+
+internal fun PrivateMessage.output(body: String) = OutputPrivateMessage(this, body)
diff --git a/briar-headless/src/main/java/org/briarproject/briar/headless/messaging/MessagingController.java b/briar-headless/src/main/java/org/briarproject/briar/headless/messaging/MessagingController.java
deleted file mode 100644
index 7146bc8ce..000000000
--- a/briar-headless/src/main/java/org/briarproject/briar/headless/messaging/MessagingController.java
+++ /dev/null
@@ -1,97 +0,0 @@
-package org.briarproject.briar.headless.messaging;
-
-import org.briarproject.bramble.api.FormatException;
-import org.briarproject.bramble.api.contact.Contact;
-import org.briarproject.bramble.api.contact.ContactId;
-import org.briarproject.bramble.api.contact.ContactManager;
-import org.briarproject.bramble.api.db.DbException;
-import org.briarproject.bramble.api.db.NoSuchContactException;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.sync.Group;
-import org.briarproject.bramble.api.system.Clock;
-import org.briarproject.briar.api.messaging.MessagingManager;
-import org.briarproject.briar.api.messaging.PrivateMessage;
-import org.briarproject.briar.api.messaging.PrivateMessageFactory;
-import org.briarproject.briar.api.messaging.PrivateMessageHeader;
-
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.List;
-
-import javax.annotation.Nullable;
-import javax.annotation.concurrent.Immutable;
-import javax.inject.Inject;
-import javax.inject.Singleton;
-
-import io.javalin.Context;
-
-import static org.briarproject.briar.api.messaging.MessagingConstants.MAX_PRIVATE_MESSAGE_BODY_LENGTH;
-
-@Immutable
-@Singleton
-@NotNullByDefault
-public class MessagingController {
-
-	private final MessagingManager messagingManager;
-	private final PrivateMessageFactory privateMessageFactory;
-	private final ContactManager contactManager;
-	private final Clock clock;
-
-	@Inject
-	public MessagingController(MessagingManager messagingManager,
-			PrivateMessageFactory privateMessageFactory,
-			ContactManager contactManager,
-			Clock clock) {
-		this.messagingManager = messagingManager;
-		this.privateMessageFactory = privateMessageFactory;
-		this.contactManager = contactManager;
-		this.clock = clock;
-	}
-
-	public Context list(Context ctx) throws DbException {
-		Contact contact = getContact(ctx);
-		if (contact == null) return ctx.status(404);
-
-		Collection<PrivateMessageHeader> headers =
-				messagingManager.getMessageHeaders(contact.getId());
-		List<OutputPrivateMessage> messages = new ArrayList<>(headers.size());
-		for (PrivateMessageHeader header : headers) {
-			String body = messagingManager.getMessageBody(header.getId());
-			messages.add(new OutputPrivateMessage(header, body));
-		}
-		return ctx.json(messages);
-	}
-
-	public Context write(Context ctx) throws DbException, FormatException {
-		Contact contact = getContact(ctx);
-		if (contact == null) return ctx.status(404);
-
-		String message = ctx.formParam("message");
-		if (message == null || message.length() < 1)
-			return ctx.status(500).result("Expecting Message text");
-		if (message.length() > MAX_PRIVATE_MESSAGE_BODY_LENGTH)
-			return ctx.status(500).result("Message text too large");
-
-		Group group = messagingManager.getContactGroup(contact);
-		long now = clock.currentTimeMillis();
-		PrivateMessage m = privateMessageFactory
-				.createPrivateMessage(group.getId(), now, message);
-
-		messagingManager.addLocalMessage(m);
-		return ctx.json(new OutputPrivateMessage(m, message));
-	}
-
-	@Nullable
-	private Contact getContact(Context ctx) throws DbException {
-		String contactString = ctx.param("contactId");
-		if (contactString == null) return null;
-		int contactInt = Integer.parseInt(contactString);
-		ContactId contactId = new ContactId(contactInt);
-		try {
-			return contactManager.getContact(contactId);
-		} catch (NoSuchContactException e) {
-			return null;
-		}
-	}
-
-}
diff --git a/briar-headless/src/main/java/org/briarproject/briar/headless/messaging/MessagingController.kt b/briar-headless/src/main/java/org/briarproject/briar/headless/messaging/MessagingController.kt
new file mode 100644
index 000000000..d9fca98fb
--- /dev/null
+++ b/briar-headless/src/main/java/org/briarproject/briar/headless/messaging/MessagingController.kt
@@ -0,0 +1,66 @@
+package org.briarproject.briar.headless.messaging
+
+import io.javalin.BadRequestResponse
+import io.javalin.Context
+import io.javalin.NotFoundResponse
+import org.briarproject.bramble.api.contact.Contact
+import org.briarproject.bramble.api.contact.ContactId
+import org.briarproject.bramble.api.contact.ContactManager
+import org.briarproject.bramble.api.db.NoSuchContactException
+import org.briarproject.bramble.api.system.Clock
+import org.briarproject.briar.api.messaging.MessagingConstants.MAX_PRIVATE_MESSAGE_BODY_LENGTH
+import org.briarproject.briar.api.messaging.MessagingManager
+import org.briarproject.briar.api.messaging.PrivateMessageFactory
+import javax.annotation.concurrent.Immutable
+import javax.inject.Inject
+import javax.inject.Singleton
+
+@Immutable
+@Singleton
+class MessagingController @Inject
+constructor(
+    private val messagingManager: MessagingManager,
+    private val privateMessageFactory: PrivateMessageFactory,
+    private val contactManager: ContactManager,
+    private val clock: Clock
+) {
+
+    fun list(ctx: Context): Context {
+        val contact = getContact(ctx)
+
+        val messages = messagingManager.getMessageHeaders(contact.id).map { header ->
+            val body = messagingManager.getMessageBody(header.id)
+            header.output(body)
+        }
+        return ctx.json(messages)
+    }
+
+    fun write(ctx: Context): Context {
+        val contact = getContact(ctx)
+
+        val message = ctx.formParam("message")
+        if (message == null || message.isEmpty())
+            throw BadRequestResponse("Expecting Message text")
+        if (message.length > MAX_PRIVATE_MESSAGE_BODY_LENGTH)
+            throw BadRequestResponse("Message text too large")
+
+        val group = messagingManager.getContactGroup(contact)
+        val now = clock.currentTimeMillis()
+        val m = privateMessageFactory.createPrivateMessage(group.id, now, message)
+
+        messagingManager.addLocalMessage(m)
+        return ctx.json(m.output(message))
+    }
+
+    private fun getContact(ctx: Context): Contact {
+        val contactString = ctx.pathParam("contactId")
+        val contactInt = Integer.parseInt(contactString)
+        val contactId = ContactId(contactInt)
+        return try {
+            contactManager.getContact(contactId)
+        } catch (e: NoSuchContactException) {
+            throw NotFoundResponse()
+        }
+    }
+
+}
diff --git a/briar-headless/src/main/java/org/briarproject/briar/headless/messaging/OutputPrivateMessage.java b/briar-headless/src/main/java/org/briarproject/briar/headless/messaging/OutputPrivateMessage.java
deleted file mode 100644
index 6cf491d0e..000000000
--- a/briar-headless/src/main/java/org/briarproject/briar/headless/messaging/OutputPrivateMessage.java
+++ /dev/null
@@ -1,43 +0,0 @@
-package org.briarproject.briar.headless.messaging;
-
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.briar.api.messaging.PrivateMessage;
-import org.briarproject.briar.api.messaging.PrivateMessageHeader;
-
-import javax.annotation.concurrent.Immutable;
-
-@Immutable
-@NotNullByDefault
-@SuppressWarnings("WeakerAccess")
-public class OutputPrivateMessage {
-
-	public final String body;
-	public final long timestamp;
-	public final boolean read, seen, sent, local;
-	public final byte[] id, groupId;
-
-	OutputPrivateMessage(PrivateMessageHeader header, String body) {
-		this.body = body;
-		this.timestamp = header.getTimestamp();
-		this.read = header.isRead();
-		this.seen = header.isSeen();
-		this.sent = header.isSent();
-		this.local = header.isLocal();
-		this.id = header.getId().getBytes();
-		this.groupId = header.getGroupId().getBytes();
-	}
-
-	/**
-	 * Only meant for own {@link PrivateMessage}s directly after creation.
-	 */
-	OutputPrivateMessage(PrivateMessage m, String body) {
-		this.body = body;
-		this.timestamp = m.getMessage().getTimestamp();
-		this.read = true;
-		this.seen = true;
-		this.sent = false;
-		this.local = true;
-		this.id = m.getMessage().getId().getBytes();
-		this.groupId = m.getMessage().getGroupId().getBytes();
-	}
-}
diff --git a/briar-headless/src/main/java/org/briarproject/briar/headless/messaging/OutputPrivateMessage.kt b/briar-headless/src/main/java/org/briarproject/briar/headless/messaging/OutputPrivateMessage.kt
new file mode 100644
index 000000000..1b93256ee
--- /dev/null
+++ b/briar-headless/src/main/java/org/briarproject/briar/headless/messaging/OutputPrivateMessage.kt
@@ -0,0 +1,44 @@
+package org.briarproject.briar.headless.messaging
+
+import org.briarproject.briar.api.messaging.PrivateMessage
+import org.briarproject.briar.api.messaging.PrivateMessageHeader
+import javax.annotation.concurrent.Immutable
+
+@Immutable
+@Suppress("unused", "MemberVisibilityCanBePrivate")
+internal class OutputPrivateMessage {
+
+    val body: String
+    val timestamp: Long
+    val read: Boolean
+    val seen: Boolean
+    val sent: Boolean
+    val local: Boolean
+    val id: ByteArray
+    val groupId: ByteArray
+
+    internal constructor(header: PrivateMessageHeader, body: String) {
+        this.body = body
+        this.timestamp = header.timestamp
+        this.read = header.isRead
+        this.seen = header.isSeen
+        this.sent = header.isSent
+        this.local = header.isLocal
+        this.id = header.id.bytes
+        this.groupId = header.groupId.bytes
+    }
+
+    /**
+     * Only meant for own [PrivateMessage]s directly after creation.
+     */
+    internal constructor(m: PrivateMessage, body: String) {
+        this.body = body
+        this.timestamp = m.message.timestamp
+        this.read = true
+        this.seen = true
+        this.sent = false
+        this.local = true
+        this.id = m.message.id.bytes
+        this.groupId = m.message.groupId.bytes
+    }
+}
diff --git a/briar-headless/witness.gradle b/briar-headless/witness.gradle
index 0f51803bd..fc741e429 100644
--- a/briar-headless/witness.gradle
+++ b/briar-headless/witness.gradle
@@ -7,7 +7,7 @@ dependencyVerification {
         'com.google.dagger:dagger-producers:2.0-beta:dagger-producers-2.0-beta.jar:99ec15e8a0507ba569e7655bc1165ee5e5ca5aa914b3c8f7e2c2458f724edd6b',
         'com.google.dagger:dagger:2.0.2:dagger-2.0.2.jar:84c0282ed8be73a29e0475d639da030b55dee72369e58dd35ae7d4fe6243dcf9',
         'com.google.guava:guava:18.0:guava-18.0.jar:d664fbfc03d2e5ce9cab2a44fb01f1d0bf9dfebeccc1a473b1f9ea31f79f6f99',
-        'io.javalin:javalin:1.7.0:javalin-1.7.0.jar:d97d2044a7b050a3b6564c9a99a0a94a4c6d8c57818033cf0d8236bc90a8069b',
+        'io.javalin:javalin:2.1.0:javalin-2.1.0.jar:d52264afbecddd1a8926a6d3b6f84ca534afa4d3997176c99e96ca2e0874577a',
         'io.mockk:mockk-agent-api:1.8.6:mockk-agent-api-1.8.6.jar:613512c66538e6349e03df641a868f4ee324f13e2e1dbd67a0ed388aa664a444',
         'io.mockk:mockk-agent-common:1.8.6:mockk-agent-common-1.8.6.jar:cb7cb26fae5bfd3c89090858548990f311b27f673b9efa9d0c94f97c463b2863',
         'io.mockk:mockk-agent-jvm:1.8.6:mockk-agent-jvm-1.8.6.jar:3f30b98d23ada8b5a44d75b43cd58fc03252fcb96939ff31e7ad659818af1e5d',
@@ -20,29 +20,28 @@ dependencyVerification {
         'net.bytebuddy:byte-buddy-agent:1.8.8:byte-buddy-agent-1.8.8.jar:dc1a2dcefe72731fa89ae84e32231c74d545ccf8216c79865096e546f20c57e8',
         'net.bytebuddy:byte-buddy:1.8.8:byte-buddy-1.8.8.jar:30aed1ae2ee5261b1d2f0e98ec3fcb40755c3f61b378089fb65d56098df1f16b',
         'org.apiguardian:apiguardian-api:1.0.0:apiguardian-api-1.0.0.jar:1f58b77470d8d147a0538d515347dd322f49a83b9e884b8970051160464b65b3',
-        'org.eclipse.jetty.websocket:websocket-api:9.4.9.v20180320:websocket-api-9.4.9.v20180320.jar:985b737f5c0928d48fc9890b261cbed096625350b9c0e321f44bde8a803c85ec',
-        'org.eclipse.jetty.websocket:websocket-client:9.4.9.v20180320:websocket-client-9.4.9.v20180320.jar:2f5c6a64987ac27a21862a6349bd2b1d25545cba9aa68084e50ef77af7adcd7d',
-        'org.eclipse.jetty.websocket:websocket-common:9.4.9.v20180320:websocket-common-9.4.9.v20180320.jar:26fc6bba6ad8e6522b27d5f397429c349264bcea076bd186ad885ef0cd0a73c8',
-        'org.eclipse.jetty.websocket:websocket-server:9.4.9.v20180320:websocket-server-9.4.9.v20180320.jar:93ebcfa8e8af9876491d1524b4e8d273be8a7576e18b75ef699bad9564f76de2',
-        'org.eclipse.jetty.websocket:websocket-servlet:9.4.9.v20180320:websocket-servlet-9.4.9.v20180320.jar:cac3f46db4917722b860e194907c36c251d2765ca1ce8323085c47cefafec52b',
-        'org.eclipse.jetty:jetty-client:9.4.9.v20180320:jetty-client-9.4.9.v20180320.jar:d6d8eca17806261a96137f64ad14c33feed26ba031c92180162961589141072d',
-        'org.eclipse.jetty:jetty-http:9.4.9.v20180320:jetty-http-9.4.9.v20180320.jar:823e76a9565f8a98c96542745f34560e2a6a9dfa6fbe320614061ad9b17b950b',
-        'org.eclipse.jetty:jetty-io:9.4.9.v20180320:jetty-io-9.4.9.v20180320.jar:fffa35ca529d3267ad80d87f83ad4f6796b0981ae21d3ff621151bbe0a8f4155',
-        'org.eclipse.jetty:jetty-security:9.4.9.v20180320:jetty-security-9.4.9.v20180320.jar:5cbaeb9837aa331a8ee918724786655c6f60f8cc65ab84e03ff587bc212a2327',
-        'org.eclipse.jetty:jetty-server:9.4.9.v20180320:jetty-server-9.4.9.v20180320.jar:b45869789b8f8081c1c75c059b4fd262d2fd440fa676c54bc753365fdd1f82d6',
-        'org.eclipse.jetty:jetty-servlet:9.4.9.v20180320:jetty-servlet-9.4.9.v20180320.jar:a96f8711d4f9d5d4c3fcafa046fb5caefec17eefcbfcd35b6c2e1d5a0549edfc',
-        'org.eclipse.jetty:jetty-util:9.4.9.v20180320:jetty-util-9.4.9.v20180320.jar:86ccb5e178e7001f26a12ec4bf56c522911424a0edf60424f15add8601355fc5',
-        'org.eclipse.jetty:jetty-webapp:9.4.9.v20180320:jetty-webapp-9.4.9.v20180320.jar:7d6c6af12f10a47524e8eabc607226b038100680612ea569f92c030158bd5566',
-        'org.eclipse.jetty:jetty-xml:9.4.9.v20180320:jetty-xml-9.4.9.v20180320.jar:2a0c8e64364cb8d0f483e5e050db6fbd26f0ad9e5098367f8af7928887fa5ece',
+        'org.eclipse.jetty.websocket:websocket-api:9.4.11.v20180605:websocket-api-9.4.11.v20180605.jar:924edcf7fb17f2ff2e541afce7fd692305235e51b5a16f7223d7e8b4de77559d',
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