diff --git a/deploy/aws/README.md b/deploy/aws/README.md
index 3949d0e6..15b35e14 100644
--- a/deploy/aws/README.md
+++ b/deploy/aws/README.md
@@ -9,6 +9,7 @@ This project contains source code and supporting files for a serverless applicat
 The application uses several AWS resources, including Lambda functions and an API Gateway API. These resources are defined in the `template.yaml` file in this project. You can update the template to add AWS resources through the same deployment process that updates your application code.
 
 See the [AWS SAM developer guide](https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/what-is-sam.html) for deployment, usage and an introduction to SAM specification, the SAM CLI, and serverless application concepts.
+[The AWS Toolkit Plugin](https://aws.amazon.com/de/intellij/) helps build the Lambda function without errors.
 
 ## Interface
 
diff --git a/deploy/aws/java11Exec/pom.xml b/deploy/aws/java11Exec/pom.xml
index 6cb880ad..2f9b4cb4 100644
--- a/deploy/aws/java11Exec/pom.xml
+++ b/deploy/aws/java11Exec/pom.xml
@@ -41,7 +41,7 @@
         <!-- https://mvnrepository.com/artifact/org.hamcrest/hamcrest-core -->
         <dependency>
             <groupId>org.hamcrest</groupId>
-            <artifactId>hamcrest-core</artifactId>
+            <artifactId>hamcrest</artifactId>
             <version>3.0</version>
         </dependency>
     </dependencies>
diff --git a/deploy/aws/java11Exec/src/main/java/poseidon/App.java b/deploy/aws/java11Exec/src/main/java/poseidon/App.java
index 7beb1103..48b1591c 100644
--- a/deploy/aws/java11Exec/src/main/java/poseidon/App.java
+++ b/deploy/aws/java11Exec/src/main/java/poseidon/App.java
@@ -95,6 +95,8 @@ public APIGatewayProxyResponseEvent handleRequest(final APIGatewayV2WebSocketEve
 
             ProcessBuilder pb = new ProcessBuilder(cmd);
             pb.directory(workingDirectory);
+            Map<String, String> env = pb.environment();
+            env.put("CLASSPATH", ".:/var/task/lib/org.hamcrest.hamcrest-core-3.0.jar:/var/task/lib/junit.junit-4.13.2.jar:" + env.get("CLASSPATH"));
             Process p = pb.start();
             InputStream stdout = p.getInputStream(), stderr = p.getErrorStream();
             this.forwardOutput(p, stdout, stderr);
diff --git a/deploy/aws/java11Exec/src/main/java/poseidon/SimpleMakefile.java b/deploy/aws/java11Exec/src/main/java/poseidon/SimpleMakefile.java
index 7e5a16c6..4e86c330 100644
--- a/deploy/aws/java11Exec/src/main/java/poseidon/SimpleMakefile.java
+++ b/deploy/aws/java11Exec/src/main/java/poseidon/SimpleMakefile.java
@@ -71,8 +71,6 @@ private void parseRules(String makefile) {
                     .map(s -> s.startsWith("@") ? s.substring(1) : s)
                     .map(s -> s.contains("#") ? s.substring(0, s.indexOf("#")) : s)
                     .filter(s -> !s.isEmpty())
-                    .map(s -> s.replaceAll("/usr/java/lib/hamcrest-core-1\\.3\\.jar", "/var/task/lib/org.hamcrest.hamcrest-core-1.3.jar"))
-                    .map(s -> s.replaceAll("/usr/java/lib/junit-4\\.13\\.jar", "/var/task/lib/junit.junit-4.13.2.jar"))
                     .toArray(String[]::new);
 
             rules.put(ruleName, trimmedCommands);
diff --git a/deploy/aws/java11Exec/src/test/java/poseidon/SimpleMakefileTest.java b/deploy/aws/java11Exec/src/test/java/poseidon/SimpleMakefileTest.java
index f3679410..18973605 100644
--- a/deploy/aws/java11Exec/src/test/java/poseidon/SimpleMakefileTest.java
+++ b/deploy/aws/java11Exec/src/test/java/poseidon/SimpleMakefileTest.java
@@ -39,8 +39,8 @@ public class SimpleMakefileTest {
 
   static final String SuccessfulMakefileWithAssignments = Base64.getEncoder().encodeToString(
           ("test:\n" +
-                  "\tjavac -encoding utf8 -cp .:/usr/java/lib/hamcrest-core-1.3.jar:/usr/java/lib/junit-4.13.jar ${FILENAME}\n" +
-                  "\tjava -Dfile.encoding=UTF8 -cp .:/usr/java/lib/hamcrest-core-1.3.jar:/usr/java/lib/junit-4.13.jar org.junit.runner.JUnitCore ${CLASS_NAME}\n"
+                  "\tjavac -encoding utf8 ${FILENAME}\n" +
+                  "\tjava -Dfile.encoding=UTF8 ${CLASS_NAME}\n"
           ).getBytes(StandardCharsets.UTF_8));
 
   static final String SuccessfulMakefileWithComment = Base64.getEncoder().encodeToString(
@@ -126,8 +126,8 @@ public void sucessfullMakeWithAssignments() {
       SimpleMakefile make = new SimpleMakefile(files);
       String cmd = make.parseCommand(command);
 
-      assertEquals("javac -encoding utf8 -cp .:/var/task/lib/org.hamcrest.hamcrest-core-1.3.jar:/var/task/lib/junit.junit-4.13.2.jar RecursiveMath-Test.java && " +
-              "java -Dfile.encoding=UTF8 -cp .:/var/task/lib/org.hamcrest.hamcrest-core-1.3.jar:/var/task/lib/junit.junit-4.13.2.jar org.junit.runner.JUnitCore RecursiveMath", cmd);
+      assertEquals("javac -encoding utf8 RecursiveMath-Test.java && " +
+              "java -Dfile.encoding=UTF8 RecursiveMath", cmd);
     } catch (NoMakefileFoundException | InvalidMakefileException | NoMakeCommandException ignored) {
       fail();
     }