Recently switched back to openSUSE after a brief stint with Ubuntu. I guess you need to try other things out to know how good you have it, eh? Anyway, I'm playing with Leiningen and Quil, but for some reason or other, I could not get Leiningen to self-install, because of an exception:

java.security.KeyStoreException: problem accessing trust storejava.io.IOException: Invalid keystore format

It turns out that the java keystore is somehow corrupt on OpenJDK / openSUSE 12.3. Not sure who's at fault, but here's how to fix it.

Become root:
```
$ su -
Password:
#
```

Verify the certificates file:

# file $(readlink /usr/lib64/jvm/java-1.7.0-openjdk/jre/lib/security/cacerts)
/var/lib/ca-certificates/java-cacerts: data

Oops, file should identify this as a Java KeyStore. Must be corrupt. Replace it:

# rm /var/lib/ca-certificates/java-cacerts
# /usr/sbin/update-ca-certificates
creating /var/lib/ca-certificates/java-cacerts ...
144 added, 0 removed.
creating /var/lib/ca-certificates/gcj-cacerts ...
imporing AffirmTrust_Premium_ECC.pem failed: java.security.spec.InvalidKeySpecException
imporing COMODO_ECC_Certification_Authority.pem failed: java.security.spec.InvalidKeySpecException
imporing GeoTrust_Primary_Certification_Authority_G2.pem failed: java.security.spec.InvalidKeySpecException
imporing VeriSign_Class_3_Public_Primary_Certification_Authority_G4.pem failed: java.security.spec.InvalidKeySpecException
imporing thawte_Primary_Root_CA_G2.pem failed: java.security.spec.InvalidKeySpecException
2 added, 0 removed.

Hmm, something's up with gcj-cacerts (not just all those "imporing"s, seems the PEM files are corrupted too?)... Anyway, re-verify the java-cacerts:
```
# file /var/lib/ca-certificates/java-cacerts
/var/lib/ca-certificates/java-cacerts: Java KeyStore
```
Good to go (sort-of?)