Had this issue for a while, but have only found the cause today;

While developing applications with Netbeans and Nokia SDK for Java 2.0, Nokia Asha SDK 1.0 and 1.1, Netbeans won't apply breakpoints if your full jar path contains spaces, with debugger console saying:

Code:
Not able to submit breakpoint LineBreakpoint Midlet.java : 17, reason: No executable location available at line 17 in class mobileapplication1.Midlet.
Invalid LineBreakpoint Midlet.java : 17
Steps to reproduce:
-Windows 7, Netbeans 7.4, any of aforementioned sdk;
-Create new "Java ME/Mobile Application" project with main package and executable class, setting any of the sdk as target platform. Make sure path contains space character (e.g. "C:\Mobile Application\");
-Add 'System.out.println("foo");' to startApp method of Midlet class, set breakpoint at this line;
-Debug your project