diff --git a/src/main/java/ley/untis/UntisClient.java b/src/main/java/ley/untis/UntisClient.java
new file mode 100644
index 0000000..4fc073c
--- /dev/null
+++ b/src/main/java/ley/untis/UntisClient.java
@@ -0,0 +1,45 @@
+package ley.untis;
+
+import com.googlecode.jsonrpc4j.JsonRpcHttpClient;
+import ley.untis.data.AuthParams;
+import ley.untis.data.AuthResponse;
+import ley.untis.exception.APIRequestException;
+
+import java.net.URL;
+import java.util.HashMap;
+import java.util.Map;
+
+public class UntisClient {
+
+    JsonRpcHttpClient client;
+    public AuthResponse auth;
+    Map<String , String> header;
+
+    public UntisClient(String username, String password, String url, String school, String appname) throws APIRequestException{
+        try {
+            client = new JsonRpcHttpClient(new URL(url + "?school=" + school));
+
+            auth = client.invoke("authenticate", new AuthParams(username, password, appname), AuthResponse.class);
+            header = new HashMap<>();
+            header.put("cookie", "JSESSIONID=" + auth.sessionId);
+            client.setHeaders(header);
+        } catch (Throwable e) {
+            throw new APIRequestException(e);
+        }
+
+    }
+
+    public UntisClient(String username, String password, String url, String school) throws APIRequestException{
+        this(username, password, url, school, "JavaUntis");
+    }
+
+    public void logout() throws APIRequestException {
+        try {
+            client.invoke("logout", new Object[0], Object.class);
+        } catch (Throwable e) {
+            throw new APIRequestException(e);
+        }
+    }
+
+
+}
diff --git a/src/main/java/ley/untis/data/AuthParams.java b/src/main/java/ley/untis/data/AuthParams.java
new file mode 100644
index 0000000..2401082
--- /dev/null
+++ b/src/main/java/ley/untis/data/AuthParams.java
@@ -0,0 +1,15 @@
+package ley.untis.data;
+
+public class AuthParams {
+
+    public String user;
+    public String password;
+    public String client;
+
+    public AuthParams(String user, String password, String client) {
+        this.user = user;
+        this.password = password;
+        this.client = client;
+    }
+
+}
diff --git a/src/main/java/ley/untis/data/AuthResponse.java b/src/main/java/ley/untis/data/AuthResponse.java
new file mode 100644
index 0000000..50f474a
--- /dev/null
+++ b/src/main/java/ley/untis/data/AuthResponse.java
@@ -0,0 +1,10 @@
+package ley.untis.data;
+
+public class AuthResponse {
+
+    public String sessionId;
+    public int personType;
+    public int personId;
+    public int klasseId;
+
+}
diff --git a/src/main/java/ley/untis/exception/APIRequestException.java b/src/main/java/ley/untis/exception/APIRequestException.java
new file mode 100644
index 0000000..8f98b92
--- /dev/null
+++ b/src/main/java/ley/untis/exception/APIRequestException.java
@@ -0,0 +1,20 @@
+package ley.untis.exception;
+
+public class APIRequestException extends Exception {
+
+    Throwable source;
+
+    public APIRequestException(Throwable error) {
+        source = error;
+    }
+
+    @Override
+    public String getMessage() {
+        return source.getMessage();
+    }
+
+    @Override
+    public String getLocalizedMessage() {
+        return source.getLocalizedMessage();
+    }
+}