Java Troubleshooting Scenarios

Scenario: "Rio de Janeiro": Do we have another option?

Level: Easy

Type: Fix

Access: Paid

Description: This scenario server is dedicated to Jenkins, a Java application managed by systemd. Jenkins is failing to start. Troubleshoot and find the problem, then apply the solution so Jenkins runs properly.

Test: The service must return the string "Sign in - Jenkins" amongst some other html code. You can check with the command curl -s localhost:8888/login | grep Jenkins | head -n1

The "Check My Solution" button runs the script /home/admin/agent/check.sh, which you can see and execute.

Time to Solve: 15 minutes.

Scenario: "Belo-Horizonte": A Java Enigma

Level: Hard

Type: Fix

Access: Paid

Description: (Credit for the idea: fuero)

There is a one-class Java application in your /home/admin directory. Running the program will print out a secret code, or you may be able to extract the secret from the class file without executing it but I'm not providing any special tools for that.

Put the secret code in a /home/admin/solution file, eg echo "code" > /home/admin/solution.

Test: md5sum /home/admin/solution |awk '{print $1}' returns 9d2bd7aabb26681eacd9444da6b6643c

Time to Solve: 20 minutes.