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I came across the blog post http://www.3pillarglobal.com/insights/hbase-coprocessors and this interesting bit:
This means that you can load both Observer and Endpoint Coprocessor statically using the following Method of HTableDescriptor:
addCoprocessor(String className, org.apache.hadoop.fs.Path jarFilePath, int priority, Map<String,String> kvs) throws IOExceptionIn my case, the above method worked fine for Observer Coprocessor but didn’t work for Endpoint Coprocessor, causing the table to become unavailable and finally I had to restart my HBase. The same Endpoint Coprocessor worked fine when loaded statically. Use the above method for Endpoint Coprocessor with caution.
To check this I wrote a test, attached. It passes, all seems ok. Guessing the complaint was due to user error, probably jar placement/path issues.
Let's still commit the test.