I downloaded Netbeans 7.4 and Java 7 Update 51. I get the below error when I try to start Java DB or derby connection from Netbeans. This is on a windows 8 PC. I downloaded
My solution to this was to reinstall jdk 1.7.45, uninstall netbeans and reinstall it selecting the outdated jdk. Don't know if there is a way to change sdk in NB without reinstalling it but it worked this way.
Because the upper measures didn't work I added the following permission to the end of the main permission section:
permission java.net.SocketPermission "localhost:1527", "listen,resolve";
If linux, then
file=`find $(dirname $(readlink -f $(which java)))/.. -iname 'java.policy'`; grep 1527 $file || sudo sed -i '0,/"listen"/{s/"listen".*/\0\n\tpermission java.net.SocketPermission "localhost:1527", "listen";/}' $file
cat $file
it automatically finds your java and changes permissions
According to Java™ SE Development Kit 7, Update 51 Release Notes
Change in Default Socket Permissions
The default socket permissions assigned to all code including untrusted code have been changed in this release. Previously, all code was able to bind any socket type to any port number greater than or equal to 1024. It is still possible to bind sockets to the ephemeral port range on each system. The exact range of ephemeral ports varies from one operating system to another, but it is typically in the high range (such as from 49152 to 65535). The new restriction is that binding sockets outside of the ephemeral range now requires an explicit permission in the system security policy.
Most applications using client tcp sockets and a security manager will not see any problem, as these typically bind to ephemeral ports anyway. Applications using datagram sockets or server tcp sockets (and a security manager) may encounter security exceptions where none were seen before. If this occurs, users should review whether the port number being requested is expected, and if this is the case, a socket permission grant can be added to the local security policy, to resolve the issue.
This means that you have to explicity set the permissions for your application to be able to access the ports range between 1025 and 49151. You can therefore grant this permission by appending this line in the list of permissions granted:
Visit your Java Home Directory and access your policy file at $JAVA_HOME/jre/lib/security/java.policy
and make the following changes.
grant{
//List of granted permissions
permission java.net.SocketPermission "localhost:1527", "listen";
}
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:
grant { permission java.net.SocketPermission "localhost:1527", "listen"; };
Good luck.
The problem is the Java 7u51, it have a bug that affect Derby and other programs and libraries, I suggest to install the Java 7u45