Member Avatar for Andrew Minus

Hi everyone,
First of all ,this is my first new threads and grant to someone who opened my threads to ingnore my horrible mistakes.

I am the student of learning Java Program and i would like to know whether a virus can be produced with Java and if so , i'd like to see a program as a sample.

Thank you to see my thread and i hope that you'll answer to me.

^_^

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  • Latest Post Latest Post by jwenting

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Short answer for : yes — Java can be used to build malicious programs, but how dangerous it can be depends on how and where the code runs. A Java program executed with normal OS permissions can do the same harmful things as a native program. Code run inside a browser-style sandbox or constrained runtime is more limited, but that sandbox is not a guarantee and its role in modern Java is changing (see JEP 411 for the SecurityManager deprecation) (https://openjdk.org/jeps/411).

To expand on replies from and : Java’s bytecode verifier, class loaders and (historically) the SecurityManager reduce some classes of bugs common in native code, so simple “traditional” viruses are harder to write. However there are real attack vectors — native code via JNI, insecure deserialization, reflection abuse, or social engineering that gets users to run a jar with full privileges. OWASP’s writeup on deserialization is a good example of a Java-specific risk (https://owasp.org/www-community/vulnerabilities/Deserialization_of_untrusted_data). For learning purposes, remember ’s point: producing or sharing working virus code is illegal and unethical.

Practical, safe next steps and defensive focus:

  • Learn the Java security model and secure coding patterns (Oracle Java Security Tutorial) (https://docs.oracle.com/javase/tutorial/security/).
  • Study deserialization safety and input validation; avoid trusting serialized data.
  • Use code signing, least privilege, up-to-date runtimes, and container/VM sandboxes for analysis or testing.
  • For analysis only: inspect JAR contents and metadata, use decompilers and static analyzers (SpotBugs, dependency checks) inside an isolated lab — do not execute untrusted binaries on your main system.

If the goal is education, pick defensive projects: write safe serialization code, build a minimal sandbox-style runner for controlled experiments, or analyze known samples on an isolated VM. That teaches the mechanics without creating real risk.

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Member Avatar for server_crash

Of course it's possible, although a virus in java won't be as destructive or easy to create as in most languages.

Member Avatar for chrisbliss18

Considering that producing a virus could potentially be a criminal activity, I don't think you can reasonably expect anyone to post virus code. Why are you interested in code for a virus in Java?

Member Avatar for jwenting

A virus is a self-replicating program that replicates without permission from the system it is infecting.
In Java this is rather hard to do because of the security restrictions Java operates under.

And indeed creating a virus is illegal and goes against anything a professional considers social behaviour. We're not here to help criminals.

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