Is learning Java worth it for someone pursuing Cybersecurity/Black Hat Hacking?

Discussion & Solutions
1

Hi everyone,

I’m currently a BCA student (starting 3rd semester) and Java is part of my curriculum this term. My actual interest lies in cybersecurity, ethical hacking, Black Hat Hacking and penetration testing — and I’m trying to figure out how much time/depth I should invest in Java versus focusing on other languages more commonly associated with security work (like Python, C, or Bash).

A few specific things I’d love input on:

  1. Practical relevance: Where does Java actually show up in real-world security work?
  2. Tool ecosystem: I know tools like Burp Suite are built in Java. Does knowing Java help in customizing/extending such tools (writing Burp extensions, etc.)?
  3. Career/interview value: Do cybersecurity job postings or CTF challenges commonly expect Java knowledge, or is it more of a “nice to have”?
  4. Priority-wise, if my end goal is ethical hacking/black hat hacking /red teaming, should I treat Java as a “learn well” subject or a “get through the exam and move on” subject and instead double down on Python/C/networking fundamentals?

Would really appreciate insights from people already working in security roles — especially if you started with a similar academic background (Java-heavy curriculum) and pivoted into security. Thanks in advance!

2

i’d recommend you double down on python. Its useful if you also wan’t to change careers say Data Science. I’d also focus on getting industry professional certifications such as CEH, CISA etc although some could get pretty expensive

3

Yess, I will focus on PYTHON.

4

ofc go with python bro

5

@Fake_email1 — the whole thread’s answering the wrong question, so let me flip it.

Python vs Java isn’t a fight. They’re not the same kind of thing. Sort every language into two piles:

  • :snake: Tool-writing languages — what you build your scripts/exploits/automation in → Python, Bash. This pile is settled: Python wins, everyone’s right.
  • :bullseye: Target-reading languages — what the thing you’re attacking is written in → Java, C, JavaScript. You don’t “prefer” these. The target picks them for you.

Java lives in the second pile — and that’s the part everyone telling you “skip it” is missing. You’re not choosing Java over Python. You’re deciding whether to stay blind to half your targets.

:one: Where Java actually shows up — the crown-jewel targets are Java:

  • :bank: Enterprise web = Spring / Struts / Java backends. Log4Shell, Spring4Shell, JNDI injection, and the entire Java-deserialization gadget-chain class (the ysoserial world) are Java-native bug classes. This is where the hardest, best-paid, still-unpatched-everywhere bugs live in 2026.
  • :mobile_phone: Every Android app compiles to Dalvik and decompiles straight back to Java/smali. OWASP’s own mobile testing guide (MASTG) flatly states you need working Java knowledge to reverse an APK. No Java = Android is a black box to you.

:two: Burp — yes, exactly right. Burp extensions are written in Java via the Montoya API — that’s PortSwigger’s own documented path. Same for reading/modifying ysoserial, WebGoat, most JVM tooling. Java literacy = you extend your tools instead of waiting for someone else to.

:three: CTF / career — here’s the honest split nobody says out loud: almost nobody will ask you to write Java. They hand you Java to read and break — deserialization challenges, JWT/crypto bugs, Android RE, source-review boxes. “Can you write Java” is a nice-to-have. “Can you read unfamiliar Java and spot the sink” is a red-team core skill.

:four: Priority verdict → learn it WELL. Not for its own sake — because it’s sitting free in your curriculum this semester, and it’s the reading-key to the two biggest target ecosystems on earth (enterprise + Android). Coasting through it is throwing away an unlock you’re being handed for zero extra cost. Keep Python as your tooling main — that never changes. Bank the Java as your first target language.

🧰 Turn the theory into reps — 4 Java targets you can break this week
  • :goat: OWASP WebGoat — deliberately-vulnerable Java/Spring app, docker run and go. Teaches the exact server-side bug classes you’ll hit on real Java targets, with the “why” built in.
  • :collision: ysoserial — the Java-deserialization payload generator. Read the gadget chains and you understand a whole vuln class most self-taught hackers never touch.
  • :electric_plug: Burp Montoya API — write your first extension — PortSwigger’s official Java walkthrough. Turns “I use Burp” into “I extend Burp.”
  • :mobile_phone: OWASP MASTG — the Android reversing bible; the smali/Java decompilation chapters are why Java pays off on mobile.

Case study to anchor it all: pull up how Log4Shell worked — one Java logging string → RCE on half the internet. That’s the ceiling of what “just reading Java” buys you.

Bottom line: double down on Python — that was never in question. But “get through Java and move on” is the one piece of advice in this thread that’ll quietly cost you the enterprise and Android attack surface later. Read-Java is a hacker superpower, and yours is on sale right now. :unlocked: