java.lang.Object cannot be resolved in Eclipse

Question

When I installed the latest installment in Mac OSX - the Mountain Lion - I experienced some problems getting Eclipse to work I also lost most of my Android developer files

Answer 1

Make sure that you have a valid JRE or JDK defined in the Java Build Path of your project. Right-click on your project, select Properties... and then Java Build Path.

Answer 2

Try the following and problem will go away

• Close the project and reopen it.

• Clean the project (It will rebuild the buildpath hence reconfiguring with the JDK libraries)

  OR

• Delete and Re-import the project and if necessary do the above steps again.

Answer 3

This is an annoying Eclipse Bug which seems to bite now and then. See http://dev-answers.blogspot.de/2009/06/eclipse-build-errors-javalangobject.html for a possible solution, otherwise try the following;

Close the project and reopen it. Clean the project (It will rebuild the buildpath hence reconfiguring with the JDK libraries)

OR

Delete and Re-import the project and if necessary do the above steps again.

The better cure is to try NetBeans instead of Eclipse

Answer 4

I had to add the JDK under the build path. After adding the correct build path it worked.

Answer 5

This error caused by invalid sdk is pointing in your project.properties file of your project. project.properties -> target=android-19 . change to version which is installed in your eclipse.The error will be gone.

Answer 6

I had the same issue and none of the above solutions worked for me. Then I realized than the library (libs) folder was missing in the project. Once i added the libs folder and the corresponding Jar file, the issue was resolved..