How to fix OpenJDK-7 certificates on Ubuntu 11.10 running on Amazon EC2

After a second crash of my EC2 instance which was running Amazon‘s own Linux distribution I had to rebuild so this time I decided to put the latest official Ubuntu AMI on it. Everything ran fine until I fired up an application which takes a feed from Twitter using their stream api.

When I fired that up I got the following stack trace:

17 Feb 2012 21:13:00,790 ERROR [Twitter Stream consumer-1[Waiting for 500 milliseconds]] [in.setra.twitter.TwitterModule] Exception during processing
java.lang.RuntimeException: Unexpected error: the trustAnchors parameter must be non-emptyRelevant discussions can be on the Internet at: or
TwitterException{exceptionCode=[b5e7486f-24943238 b5e7486f-2494320e b5e7486f-2494320e b5e7486f-2494320e], statusCode=-1, retryAfter=-1, rateLimitStatus=null, featureSpecificRateLimitStatus=null, version=2.2.5-SNAPSHOT}
 at twitter4j.internal.http.HttpClientImpl.request(
 at twitter4j.internal.http.HttpClientWrapper.request(
 at twitter4j.TwitterStreamImpl.getFilterStream(
 at twitter4j.TwitterStreamImpl$7.getStream(
 at twitter4j.TwitterStreamImpl$7.getStream(
 at twitter4j.TwitterStreamImpl$
Caused by: java.lang.RuntimeException: Unexpected error: the trustAnchors parameter must be non-empty
Caused by: the trustAnchors parameter must be non-empty
 ... 23 more

After a brief search I found that for some reason when you install OpenJDK-7-jre-headless you don’t get the certificates installed & most people just switched back to the Sun/Oracle jre.

Now this worked for me – the install was a virgin setup so I hadn’t installed the sun JDK before but I found the Java 6 cacerts installed, so the following two lines fixed the problem:

cd /usr/lib/jvm/java-6-openjdk/jre/lib/security
sudo ln -s /usr/lib/jvm/java-7-openjdk-i386/jre/lib/security/cacerts cacerts

This may work elsewhere, it may not – in this instance it worked & I’m now getting a realtime stream in from Twitter.

Author: petermount1

Prolific Open Source developer who also works in the online gaming industry during the day. Develops in Java, Go, Python & any other language as necessary. Still develops on retro machines like BBC Micro & Amiga A1200

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