Registering resources in Dropwizard

Question

I am unable to register multiple resources in the run() method of my Dropwizard application. When I do,I am getting the following exception:

Exception in thread "main" MultiException[java.lang.IllegalArgumentException: A metric named io.dropwizard.db.ManagedPooledDataSource.postgresql.active already exists, java.util.concurrent.RejectedExecutionException: org.eclipse.jetty.util.thread.NonBlockingThread@27f74733]
at org.eclipse.jetty.server.Server.doStart(Server.java:329)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
at io.dropwizard.cli.ServerCommand.run(ServerCommand.java:43)
at io.dropwizard.cli.EnvironmentCommand.run(EnvironmentCommand.java:43)
at io.dropwizard.cli.ConfiguredCommand.run(ConfiguredCommand.java:76)
at io.dropwizard.cli.Cli.run(Cli.java:70)
at io.dropwizard.Application.run(Application.java:73)
at com.xxx.xxx.yyy.GobblerHTTPApplication.main(GobblerHTTPApplication.java:19)

Answer 1

It seems you are initializing instances of Postgres twice for each resource which is not required. You can simply first initialize all your stores, etc. and then register your resources. Do it something like as follows:-

    /* Service manager */
    environment.lifecycle().manage(new XYZServiceManager());

    /* Adding Resources */
    environment.jersey().register(new FirstResource());
    environment.jersey().register(new SecondResource());

Hope this will solve your problem.