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Subject: Re: curator pathcache
From: Jordan Zimmerman <jordan@jordanzimmerman.com>
In-Reply-To: 
 <CAL85UBac0YpSyOiGnNUj1B-DtShaJKsjhnAKMWpOJE=uMyP3=A@mail.gmail.com>
Date: Wed, 9 Mar 2016 12:44:47 -0500
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Message-Id: <8D219520-B984-48BB-9E66-C55A9D2B3175@jordanzimmerman.com>
References: 
 <CAL85UBac0YpSyOiGnNUj1B-DtShaJKsjhnAKMWpOJE=uMyP3=A@mail.gmail.com>
To: user@curator.apache.org,
 elastic.l.k@gmail.com

Moving this to Curator=E2=80=99s list=E2=80=A6

Where do you get the NPE? Please send the stacktrace.

-Jordan

> On Mar 8, 2016, at 8:27 PM, s influxdb <elastic.l.k@gmail.com> wrote:
>=20
> I am trying to run the path cahce and keep java NPE
>=20
> Running curator 2.9.0 libraries against a zookeeper 3.4.6 cluster
> Even
>=20
> The samples are taken from the curator examples .
>=20
>=20
>=20
>  public void run () throws Exception
>       {
>             try {
>=20
>                pcache =3D new PathChildrenCache(client, PATH, true);
>             pcache.start();
>=20
>                addListener(cache);
>=20
>           //    list(pcache);
>=20
>               pcache.close();
>            }
>             finally {
>                CloseableUtils.closeQuietly(cache);
>             }
>        }
>=20
>=20
>      private static void addListener(PathChildrenCache cache)
>      {
>          // a PathChildrenCacheListener is optional. Here, it's used =
just
> to log changes
>          PathChildrenCacheListener listener =3D new
> PathChildrenCacheListener()
>          {
>              @Override
>              public void childEvent(CuratorFramework client,
> PathChildrenCacheEvent event) throws Exception
>              {
>                  switch ( event.getType() )
>                  {
>                      case CHILD_ADDED:
>                      {
>                          System.out.println("Node added: " +
> ZKPaths.getNodeFromPath(event.getData().getPath()));
>                          break;
>                      }
>=20
>                      case CHILD_UPDATED:
>                      {
>                          System.out.println("Node changed: " +
> ZKPaths.getNodeFromPath(event.getData().getPath()));
>                          break;
>                      }
>=20
>                      case CHILD_REMOVED:
>                      {
>                          System.out.println("Node removed: " +
> ZKPaths.getNodeFromPath(event.getData().getPath()));
>                          break;
>                      }
>                  }
>              }
>          };
>          cache.getListenable().addListener(listener);
>      }
>=20
>=20
> Here running a list returns empty size all the time
>=20
>      private static void list(PathChildrenCache cache)
>        {
>=20
>            if ( cache.getCurrentData().size() =3D=3D 0 )
>            {
>                System.out.println("* empty *");
>            }
>            else
>            {
>                for ( ChildData data : cache.getCurrentData() )
>                {
>                    System.out.println(data.getPath() + " =3D " + new
> String(data.getData()));
>                }
>            }
>        }