I've just downloaded Grails 2.0.4 and extracted it to /opt/grails/grails-2.0.4/ and made sure that the GRAILS_HOME environment variable is correct. But whenever I try run the "grails" command, I get the following error:
Error opening zip file or JAR manifest missing : /opt/grails/grails-2.0.4/lib/com.springsource.springloaded/springloaded-core/jars/springloaded-core-1.0.2.jar
Error occurred during initialization of VM
agent library failed to init: instrument
I don't understand what the problem could be. I've been using Grails-2.0.1 for months successfully in exactly the same way on exactly the same machine. I've tried re-downloading the grails-2.0.4.zip file in the hopes that it was a problem with the archive, but that didn't help. I also copied springloaded-core-1.0.2.jar from the grails-2.0.1/ directory, but that just caused another set of errors.
Any idea what could be going wrong?
It looks like your PATH has not been updated correctly. In other words, you are running the 2.0.1 grails script with GRAILS_HOME set to 2.0.4. You can tell because the version of spring loaded reported in the error message - 1.0.2 - is not the one required by Grails 2.0.4 (to help others diagnose this issue).
I experienced this error too. The problem is spaces in the grails home path.
If it's this:
c:/grails 2.1.0/grails2.1.0
Then it will give an error, as there's a space between "grails" and "2.1.0". I just removed the spaces and it started working.
Have you cleared out the .grails folder in your home directory?
Grails caches a bunch of files in there, it could be that that is tripping you up.
I have had similar problems in the past when my internet connection wasn't a 100% reliable, it seems that the Grails downloader does not do thorough checking of downloaded files, so files in cache can become corrupt.
It's the folder hierarchy problem!
I have faced the same issue : when i set Grails_home make sure the path you are giving is e.g c:/grails2.1.0 and not c:/grails2.1.0/grails2.1.0
it often happens when you unzip the folder 2 folder with same name are created one inside another.
hope this will resolve!!!
来源：https://stackoverflow.com/questions/11145814/grails-2-0-4-error-opening-zip-file-or-jar-manifest-missing-springloaded