Attempt to include a core class (java.* or javax.*) in something other than a core library

Question

Hi i'm new android. i'm working through the samples and have an error when running the HelloGridView app. Eclipse is giving the following error. Has anyone had the following error? Thanks.

[2010-12-06 14:38:16 - HelloGridView] trouble processing "javax/net/ServerSocketFactory.class": [2010-12-06 14:38:16 - HelloGridView] Attempt to include a core class (java.* or javax.*) in something other than a core library. It is likely that you have attempted to include in an application the core library (or a part thereof) from a desktop virtual machine. This will most assuredly not work. At a minimum, it jeopardizes the compatibility of your app with future versions of the platform. It is also often of questionable legality.

If you really intend to build a core library -- which is only appropriate as part of creating a full virtual machine distribution, as opposed to compiling an application -- then use the "--core-library" option to suppress this error message.

If you go ahead and use "--core-library" but are in fact building an application, then be forewarned that your application will still fail to build or run, at some point. Please be prepared for angry customers who find, for example, that your application ceases to function once they upgrade their operating system. You will be to blame for this problem.

If you are legitimately using some code that happens to be in a core package, then the easiest safe alternative you have is to repackage that code. That is, move the classes in question into your own package namespace. This means that they will never be in conflict with core system classes. If you find that you cannot do this, then that is an indication that the path you are on will ultimately lead to pain, suffering, grief, and lamentation.

[2010-12-06 14:38:16 - HelloGridView] 1 error; aborting [2010-12-06 14:38:16 - HelloGridView] Conversion to Dalvik format failed with error 1

Answer 1

Android framework do not allow addition of JAVA core libraries in your project as external jars.

Heres how you can add libraries to your application:

1. Open project properties by right clicking project and selecting properties
2. Select JAVA build path on the left pane
3. Select Libraries tab from right side
4. Click add Library button
5. Select JRE system library and add required package.