Not able to install/update gems

[LisBerndt]

Hello!

I try to install/update my gems, but I always see the same behavior:

Fetching [gem].gem (100%)
ERROR: While executing gem ... (Gem::Package::Formaterror)
package is corrupt, exceeption while verifying: undefined method 'path2class' for #<Psych:: ClassLoader::Restricted:0x33956d1a> (NoMethodError) C:...[gem].gem

I found some older thread which are about this problem, but no hint helped.

I reinstalled jruby and java several times, it´s always the same.

jruby 9.2.8.0 (2.5.3) (tried 9.2.6.0 as well).
Windows 10, 64-bit, Java 64-bit

[headius]

This is a new one to me!

We need more information. What version of Java/JDK? Can you try to install with gem install --verbose or some similar logging flag? I have zero ideas what this would be right now.

[LisBerndt]

It´s java version "1.8.0_221"
Java(TM) SE Runtime Environment (build 1.8.0_221-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.221-b11, mixed mode)
And I tried several other versions.

Countless times I tried to install gems by verbose after de- and reinstalling jruby as well as java.

Installing Ruby (ie not Jruby) works fine.

And here another point: on an other pc with the exactly same configurations there a no such problems.