InstallCert.java
Java program written by Andreas Sterbenz, and posted on a blog in Oct, 2006:
https://blogs.oracle.com/gc/entry/unable_to_find_valid_certification
Link to Java program in Andreas' blog no longer works, but the source was linked in another blog:
http://nodsw.com/blog/leeland/2006/12/06-no-more-unable-find-valid-certification-path-requested-target
Usage:
Need to compile, first:
javac InstallCert.java
# Access server, and retrieve certificate (accept default certificate 1)
java InstallCert [host]:[port]
# Extract certificate from created jssecacerts keystore
keytool -exportcert -alias [host]-1 -keystore jssecacerts -storepass changeit -file [host].cer
# Import certificate into system keystore
keytool -importcert -alias [host] -keystore [path to system keystore] -storepass changeit -file [host].cer
# Example:
java InstallCert woot.com:443
 Loading KeyStore /usr/lib/jvm/java-6-sun-1.6.0.26/jre/lib/security/cacerts...
 Opening connection to woot.com:443...
 Starting SSL handshake...
 javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
 <...>
 Server sent 1 certificate(s):
 1 Subject O=Woot Inc, C=US, ST=Texas, L=Carrollton, CN=*.woot.com
 Issuer CN=SecureTrust CA, O=SecureTrust Corporation, C=US
 sha1 4b 46 ca 6b 83 05 b3 51 ff c6 e7 9c fd b3 9b e3 3f 2e c4 53 
 md5 e8 a5 88 1b d5 67 bb fc 88 cc b1 c5 2b ac c4 7d 
 Enter certificate to add to trusted keystore or 'q' to quit: [1]
[enter]
 [
 [
 Version: V3
 Subject: O=Woot Inc, C=US, ST=Texas, L=Carrollton, CN=*.woot.com
 Signature Algorithm: SHA1withRSA, OID = 1.2.840.113549.1.1.5
 <...>
 Added certificate to keystore 'jssecacerts' using alias 'woot.com-1'
keytool -exportcert -alias woot.com-1 -keystore jssecacerts -storepass changeit -file woot.com.cer
 geit -file woot.com.cer
 Certificate stored in file <woot.com.cer>
 
(sudo) keytool -importcert -alias woot.com -keystore /usr/lib/jvm/java-6-sun-1.6.0.26/jre/lib/security/cacerts -storepass changeit -file woot.com.cer
 Owner: O=Woot Inc, C=US, ST=Texas, L=Carrollton, CN=*.woot.com
 Issuer: CN=SecureTrust CA, O=SecureTrust Corporation, C=US
 
 <...>
 
 Trust this certificate? [no]:
 
yes
 Certificate was added to keystore