Dr. Dobb's is part of the Informa Tech Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them. Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

Channels ▼

Eric Bruno

Dr. Dobb's Bloggers

Java and Network Port Restrictions

April 03, 2014

I've recently run into issues running JavaDB or Apache Derby with the latest Java SE 1.6 and Java SE 7 updates and now with Java SE 8. The issue is related to the latest set of security enhancements made to Java via an update. In this case, the issue requires you to explicitly grant access to Derby to listen on port 1527. In fact, Oracle modified the permissions to not allow Java applications to bind to any ports outside of the ephemeral range of 49152-65535 unless you explicitly grant it. Therefore, this issue would occur for any application running with the latest JVMs that attempts to bind to a port outside of this range.

For Derby, the easiest way to allow it is to first locate the java.policy security policy file within the {JDK_HOME}/jre/lib/security directory, where {JDK_HOME} is the location you installed the JDK. Then, add the following very liberal entry (not recommended) for port 1527 to allow any Java application access to it, within the section of the file with other "grant" entries:

grant {
    permission java.net.SocketPermission "localhost:1527", "listen";

You can be even more liberal and allow all access via this grant entry:

grant {
    permission java.security.AllPermission;

A safer entry would be to limit it to JavaDB or Derby only, and then only with the access it requires, via an entry similar to this:

grant codeBase "file:/Applications/NetBeans/glassfish/javadb/lib/*" {
    permission java.net.SocketPermission "localhost:1527", "listen,resolve";

You can read more about this security enhancement here. I hope this helps.

Happy Coding!

Related Reading

More Insights

Currently we allow the following HTML tags in comments:

Single tags

These tags can be used alone and don't need an ending tag.

<br> Defines a single line break

<hr> Defines a horizontal line

Matching tags

These require an ending tag - e.g. <i>italic text</i>

<a> Defines an anchor

<b> Defines bold text

<big> Defines big text

<blockquote> Defines a long quotation

<caption> Defines a table caption

<cite> Defines a citation

<code> Defines computer code text

<em> Defines emphasized text

<fieldset> Defines a border around elements in a form

<h1> This is heading 1

<h2> This is heading 2

<h3> This is heading 3

<h4> This is heading 4

<h5> This is heading 5

<h6> This is heading 6

<i> Defines italic text

<p> Defines a paragraph

<pre> Defines preformatted text

<q> Defines a short quotation

<samp> Defines sample computer code text

<small> Defines small text

<span> Defines a section in a document

<s> Defines strikethrough text

<strike> Defines strikethrough text

<strong> Defines strong text

<sub> Defines subscripted text

<sup> Defines superscripted text

<u> Defines underlined text

Dr. Dobb's encourages readers to engage in spirited, healthy debate, including taking us to task. However, Dr. Dobb's moderates all comments posted to our site, and reserves the right to modify or remove any content that it determines to be derogatory, offensive, inflammatory, vulgar, irrelevant/off-topic, racist or obvious marketing or spam. Dr. Dobb's further reserves the right to disable the profile of any commenter participating in said activities.

Disqus Tips To upload an avatar photo, first complete your Disqus profile. | View the list of supported HTML tags you can use to style comments. | Please read our commenting policy.