Merge pull request #43 from artamonovkirill/bump/java-21

Bump JDK to 21

Dockerfile

@@ -1,6 +1,6 @@
 # === Build maven cache ===
 
-FROM maven:3.8.3-jdk-11 AS cache
+FROM maven:3.9.9-eclipse-temurin-21 AS cache
 
 # Ensure exercise dependencies are downloaded
 WORKDIR /opt/exercise
@@ -10,14 +10,12 @@ RUN mvn test dependency:go-offline -DexcludeReactor=false
 
 # === Build runtime image ===
 
-FROM maven:3.8.3-jdk-11-slim
+FROM maven:3.9.9-eclipse-temurin-21-alpine
 WORKDIR /opt/test-runner
 
-RUN apt-get update && \
-    apt-get install -y jq && \
-    apt-get purge --auto-remove -y && \
-    apt-get clean && \
-    rm -rf /var/lib/apt/lists/*
+RUN apk update && \
+        apk add --no-cache --upgrade jq sed grep && \
+        rm -rf /var/cache/apk/*
 
 # Copy resources
 COPY . .

bin/run.sh

@@ -70,7 +70,7 @@ export JAVA_TOOL_OPTIONS="-Djansi.tmpdir=/solution/jansi-tmp -Xss128m -Xms256m -
 rm -rf target
 # Run the tests for the provided implementation file and redirect stdout and
 # stderr to capture it
-test_output=$(mvn --offline --legacy-local-repository --batch-mode --non-recursive --quiet test 2>&1)
+test_output=$(mvn --offline --batch-mode --non-recursive --quiet test 2>&1)
 exit_code=$?
 
 rm -f pom.xml
@@ -103,7 +103,7 @@ else
 
     # Manually add colors to the output to help scanning the output for errors
     colorized_test_output=$(echo "${sanitized_output}" | \
-        GREP_COLOR='01;31' grep --color=always -E -e '^\[ERROR\].+$|$')
+        GREP_COLORS='mt=01;31' grep --color=always -E -e '^\[ERROR\].+$|$')
 
     jq -n --arg output "${colorized_test_output}" '{version: 1, status: "fail", message: $output}' > ${results_file}
 fi