java - Unable to resolve Eclipse "Archive for required library..." issue

Question

I need help with resolving this very common Eclipse error.

Background: I am working on an android project with Eclipse(juno) ADT on Ubuntu 14.10 and everything was fine till I decided to work with websockets in the code, for which I included json-org.jar and WebSocket.jar, downloaded from the github project here.

Problem: I now get the "Archive for required library: cannot be read or is not a valid ZIP file" error for both these JARs.

I've spent countless hours trying to fix this build issue. So far, I've done the following:

• Add the JARs to the buildpath. Removed and Added them again.
• Downloaded the JARs again and replaced the previous files.
• Restart Eclipse.
• Close and Open the concerned project.
• Cleaned and Build the specific project.
• Cleaned the Eclipse cache by executing ./eclipse -clean from the terminal.
• Lowered my java compiler from 1.7 to 1.5
• Created a separate Android Workspace and imported the project into the new one.
• Didn't do Maven cleaning stuff since I don't use Maven.

So far, everything I've looked up and tried has failed. I have referred to the following related questions:

• Compiler error “archive for required library could not be read” - Spring Tool Suite
• archive for required library could not be read or is not a valid ZIP file

Here's a screenshot of what the project build looks like:

Can someone please help me fix this! I really need help with this one.

Answer 1

I have now fixed the issue.

I think there was a duplication conflict between some of the JARs included in the project. Eliminating WebSocket.jar, json-org.jar and java-websocket-1.3.0.jar resolved the build issue and the code didn't really need these JAR dependencies anyways.