dashbaord print errors when JVM and Cassandra to presents

[tzach]

Reproduce:
build without Java or Cassandra:

make -j 4 image=httpserver.fg

Run

./scripts/run.py --api
....

exception was caught for /jolokia/read/java.lang:type=Memory/HeapMemoryUsage/used: No JVM running
exception was caught for /jolokia/read/java.lang:type=MemoryPool,name=*: No JVM running
exception was caught for /jolokia/read/org.apache.cassandra.db:type=StorageService/LiveNodes: No JVM running

[tzach]

Right now, the only way to check if Cassandra or JVM is available is to call the REST API and fail.
@amnonh should we add a REST API to report which API are available?

[amnonh]

On Sun, Oct 5, 2014 at 3:23 PM, Tzach Livyatan [email protected]
wrote:

Right now, the only way to check if Cassandra or JVM is available is to
call the REST API and fail.
@amnonh https://github.com/amnonh should we add a REST API to report
which API are available?

There's a waiting to review patch that allows dynamically register API, so
a call to api-doc would only return the registered API

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