#fixed code
                                public synchronized void generate(final StringBuilder buffer) {
        this.count++;
        int rndnum = this.rnd.nextInt();
        buffer.append(System.currentTimeMillis());
        buffer.append('.');
        Formatter formatter = new Formatter(buffer, Locale.US);
        formatter.format("%1$016x-%2$08x", this.count, rndnum);
        formatter.close();
        buffer.append('.');
        buffer.append(this.hostname);
    }
#vulnerable code 
                                public synchronized void generate(final StringBuilder buffer) {
        this.count++;
        int rndnum = this.rnd.nextInt();
        buffer.append(System.currentTimeMillis());
        buffer.append('.');
        Formatter formatter = new Formatter(buffer, Locale.US);
        formatter.format("%1$016x-%2$08x", this.count, rndnum);
        buffer.append('.');
        buffer.append(this.hostname);
    } 
                            #location 7 
                            #vulnerability type RESOURCE_LEAK