diff --git a/extension/api/pom.xml b/extension/api/pom.xml
index 24b839c..b26548c 100644
--- a/extension/api/pom.xml
+++ b/extension/api/pom.xml
@@ -20,11 +20,6 @@
             <artifactId>spiap-api</artifactId>
         </dependency>
 
-        <dependency>
-            <groupId>io.toolisticon.spiap</groupId>
-            <artifactId>spiap-processor</artifactId>
-        </dependency>
-
     </dependencies>
 
 
@@ -32,6 +27,25 @@
 
         <plugins>
 
+			<plugin>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration combine.self="append">
+                    <annotationProcessorPaths>
+                        <path>
+                            <groupId>io.toolisticon.spiap</groupId>
+                            <artifactId>spiap-processor</artifactId>
+                            <version>${spiap.version}</version>
+                        </path>
+                        <path>
+                            <groupId>io.toolisticon.spiap</groupId>
+                            <artifactId>spiap-api</artifactId>
+                            <version>${spiap.version}</version>
+                        </path>
+                    </annotationProcessorPaths>
+                </configuration>
+            </plugin>
+
+
             <plugin>
                 <artifactId>maven-enforcer-plugin</artifactId>
                 <executions>
diff --git a/extension/junit4/pom.xml b/extension/junit4/pom.xml
index a3c1400..020e9e4 100644
--- a/extension/junit4/pom.xml
+++ b/extension/junit4/pom.xml
@@ -44,7 +44,23 @@
     <build>
 
         <plugins>
-
+            <plugin>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration combine.self="append">
+                    <annotationProcessorPaths>
+                        <path>
+                            <groupId>io.toolisticon.spiap</groupId>
+                            <artifactId>spiap-processor</artifactId>
+                            <version>${spiap.version}</version>
+                        </path>
+                        <path>
+                            <groupId>io.toolisticon.spiap</groupId>
+                            <artifactId>spiap-api</artifactId>
+                            <version>${spiap.version}</version>
+                        </path>
+                    </annotationProcessorPaths>
+                </configuration>
+            </plugin>
             <plugin>
                 <artifactId>maven-enforcer-plugin</artifactId>
                 <executions>
diff --git a/extension/junit4/src/test/java/io/toolisticon/cute/extension/plainjava/JUnit4AssertionTest.java b/extension/junit4/src/test/java/io/toolisticon/cute/extension/junit4/JUnit4AssertionTest.java
similarity index 89%
rename from extension/junit4/src/test/java/io/toolisticon/cute/extension/plainjava/JUnit4AssertionTest.java
rename to extension/junit4/src/test/java/io/toolisticon/cute/extension/junit4/JUnit4AssertionTest.java
index c699a3c..34a819b 100644
--- a/extension/junit4/src/test/java/io/toolisticon/cute/extension/plainjava/JUnit4AssertionTest.java
+++ b/extension/junit4/src/test/java/io/toolisticon/cute/extension/junit4/JUnit4AssertionTest.java
@@ -1,13 +1,13 @@
-package io.toolisticon.cute.extension.plainjava;
+package io.toolisticon.cute.extension.junit4;
 
-import io.toolisticon.cute.extension.api.AssertionSpi;
-import io.toolisticon.cute.extension.api.AssertionSpiServiceLocator;
-import io.toolisticon.cute.extension.junit4.JUnit4Assertion;
 import org.hamcrest.MatcherAssert;
 import org.hamcrest.Matchers;
 import org.junit.Assert;
 import org.junit.Test;
 
+import io.toolisticon.cute.extension.api.AssertionSpi;
+import io.toolisticon.cute.extension.api.AssertionSpiServiceLocator;
+
 /**
  * Unit test for {@link JUnit4Assertion}.
  */
diff --git a/extension/junit5/pom.xml b/extension/junit5/pom.xml
index 11c77f5..6c0fce6 100644
--- a/extension/junit5/pom.xml
+++ b/extension/junit5/pom.xml
@@ -49,9 +49,15 @@
                             <artifactId>spiap-processor</artifactId>
                             <version>${spiap.version}</version>
                         </path>
+                        <path>
+                            <groupId>io.toolisticon.spiap</groupId>
+                            <artifactId>spiap-api</artifactId>
+                            <version>${spiap.version}</version>
+                        </path>
                     </annotationProcessorPaths>
                 </configuration>
             </plugin>
+            
 
             <plugin>
                 <artifactId>maven-enforcer-plugin</artifactId>
diff --git a/extension/junit5/src/test/java/io/toolisticon/cute/extension/junit5/JUnit5AssertionTest.java b/extension/junit5/src/test/java/io/toolisticon/cute/extension/junit5/JUnit5AssertionTest.java
index 4bdac37..2f7d77d 100644
--- a/extension/junit5/src/test/java/io/toolisticon/cute/extension/junit5/JUnit5AssertionTest.java
+++ b/extension/junit5/src/test/java/io/toolisticon/cute/extension/junit5/JUnit5AssertionTest.java
@@ -2,6 +2,7 @@
 
 import io.toolisticon.cute.extension.api.AssertionSpi;
 import io.toolisticon.cute.extension.api.AssertionSpiServiceLocator;
+
 import org.hamcrest.MatcherAssert;
 import org.hamcrest.Matchers;
 import org.junit.jupiter.api.Assertions;
diff --git a/extension/plainjava/src/main/java/io/toolisticon/cute/extension/plainjava/package-info.java b/extension/plainjava/src/main/java/io/toolisticon/cute/extension/plainjava/package-info.java
deleted file mode 100644
index b57b4a6..0000000
--- a/extension/plainjava/src/main/java/io/toolisticon/cute/extension/plainjava/package-info.java
+++ /dev/null
@@ -1,5 +0,0 @@
-/**
- * This package contains all public classes and interfaces intentioned to be used as part of the public api.
- */
-@io.toolisticon.spiap.api.SpiServiceLocator(io.toolisticon.cute.extension.api.AssertionSpi.class)
-package io.toolisticon.cute.extension.plainjava;
\ No newline at end of file
diff --git a/extension/plainjava/src/test/java/io/toolisticon/cute/extension/plainjava/AssertionErrorAssertionTest.java b/extension/plainjava/src/test/java/io/toolisticon/cute/extension/plainjava/AssertionErrorAssertionTest.java
index aad3231..e9d2529 100644
--- a/extension/plainjava/src/test/java/io/toolisticon/cute/extension/plainjava/AssertionErrorAssertionTest.java
+++ b/extension/plainjava/src/test/java/io/toolisticon/cute/extension/plainjava/AssertionErrorAssertionTest.java
@@ -1,6 +1,8 @@
 package io.toolisticon.cute.extension.plainjava;
 
 import io.toolisticon.cute.extension.api.AssertionSpi;
+import io.toolisticon.cute.extension.api.AssertionSpiServiceLocator;
+
 import org.hamcrest.MatcherAssert;
 import org.hamcrest.Matchers;
 import org.junit.Assert;
diff --git a/extension/testng/pom.xml b/extension/testng/pom.xml
index 5690edc..4aabd1e 100644
--- a/extension/testng/pom.xml
+++ b/extension/testng/pom.xml
@@ -48,6 +48,11 @@
                             <artifactId>spiap-processor</artifactId>
                             <version>${spiap.version}</version>
                         </path>
+                        <path>
+                            <groupId>io.toolisticon.spiap</groupId>
+                            <artifactId>spiap-api</artifactId>
+                            <version>${spiap.version}</version>
+                        </path>
                     </annotationProcessorPaths>
                 </configuration>
             </plugin>
diff --git a/extension/testng/src/test/java/io/toolisticon/cute/extension/testng/TestNGAssertionTest.java b/extension/testng/src/test/java/io/toolisticon/cute/extension/testng/TestNGAssertionTest.java
index f439872..7eb2cd2 100644
--- a/extension/testng/src/test/java/io/toolisticon/cute/extension/testng/TestNGAssertionTest.java
+++ b/extension/testng/src/test/java/io/toolisticon/cute/extension/testng/TestNGAssertionTest.java
@@ -2,6 +2,7 @@
 
 import io.toolisticon.cute.extension.api.AssertionSpi;
 import io.toolisticon.cute.extension.api.AssertionSpiServiceLocator;
+
 import org.hamcrest.MatcherAssert;
 import org.hamcrest.Matchers;
 import org.testng.Assert;