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Steps taken: 1º. I want to compile a module source code for Java 1.7 2º. I open Module Properties, and under Sources I want to select the Source Level: I do not have the 1.7 choice in the ComboBox presented. 3º. I'm forced to select any other source level; let's say I choose 1.6 4º. Code under that Module will not compile correctly for Java 1.7 features, so... 5º. I have to go to Important Files for the Module, open project.properties file and manually make this change: from: javac.source=1.6 to: javac.source=1.7 6º. Now I can compile code for java 1.7 Any time I have to open Module Properties again, for doing any other change to them, once exiting from the properties editor, the modified line above javac.source=1.7 will be lost. Properties will default to Source Level 1.4 and that project.properties line will disappear, or since I know what will happen, and manually change the source level to 1.6, before exiting, I will have to modify again the project.properties back to 1.7, as done above.
I guess you are talking about Ant-based NBM projects? Please do not file project-type-specific issues in the generic category. Also it is a good idea to check in a newer version of the IDE (e.g. 7.1 beta or a dev build) before filing a bug report, in case your issue is already obsolete. *** This bug has been marked as a duplicate of bug 201215 ***
I'm sorry, but it is not always so obvious to know in advance which category a bug should be filled in. I do not have so deep knowledge of NetBeans project structure, to exhibit such an apparently required precision. I see a bug, and I do my best to notify it. On the other hand, I have notified a bug for a GA release. I don't know, and I believe I do not have to, whether this issue has been addressed in dev builds or beta releases, or not.