CODEWITHSUNDEEP
javamemorymemory-leaks
Howard
Howard

Reputation: 19825

A simple program to demonstrate memory leak in Java

I am looking for a simple program that can demonstrate memory leak in Java.

Thanks.

Upvotes: 5

Views: 8658

Answers (5)

Johnny
Johnny

Reputation: 15423

Let's first defined what is a memory leak in Java context - it's a situation when a program can mistakenly hold a reference to an object that is never again used during the rest of the program's run.

An example to it, would be forgetting to close an opened stream:

class MemoryLeak {

    private void startLeaking() throws IOException {
        StringBuilder input = new StringBuilder();
        URLConnection conn = new URL("www.example.com/file.txt").openConnection();

        BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream(), StandardCharsets.UTF_8));        

        while (br.readLine() != null) {
            input.append(br.readLine());
        }
    }

    public static void main(String[] args) throws IOException {
        MemoryLeak ml = new MemoryLeak();
        ml.startLeaking();
    }
}

Upvotes: 0

Aequitas
Aequitas

Reputation: 2265

 Vector v = new Vector();
 while (true)
 {
     byte b[] = new byte[1048576];
     v.add(b);
 }

This will continuously add a 1MB byte to a vector until it runs out of memory

Upvotes: 1

Vladimir Ivanov
Vladimir Ivanov

Reputation: 43108

http://www.codeproject.com/KB/books/EffectiveJava.aspx

See Item 6.

Upvotes: 3

anon
anon

Reputation:

Memory leak are for example if you have references that are not necessary any more but can't get catched by the garbage collector.

There are simple examples e.g. from IBM that shows the principle:

http://www.ibm.com/developerworks/rational/library/05/0816_GuptaPalanki/

Upvotes: 2

nc3b
nc3b

Reputation: 16250

A great example from a great book: http://www.informit.com/articles/article.aspx?p=1216151&seqNum=6

Upvotes: 0

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