Unable to start derby database from Netbeans 7.4

Question

This is what I did:

Find out exactly where the java home is by executing this instruction from NetBeans 7.4 :

System.out.println(System.getProperty("java.home"));

This is the output for my case:

C:\Program Files\Java\jdk1.7.0_51\jre

which is quite important for me, I was modifying another java.policy and took no effect and wasted me a couple of hours.

For reason of java.policy is an unix style file and read-only, I opened and edited it with notepad++ and executed as administrator (under the same java home):
```
C:\Program Files\Java\jdk1.7.0_51\jre\lib\security\java.policy
```

Add only these lines into the file after the first grant:

<pre>grant {
    permission java.net.SocketPermission "localhost:1527", "listen";
};</pre>

Save the file, which is a little tricky for reason of the permission. But if you run notepad++ or any other edit program as administrator, you can solve the problem.
Then try to connect the database from NetBeans, it works for me.