[jira] [Created] (CXF-8827) Reusing of JAX-RS Client causes memory leak

["Petr Kadlec (Jira)" <ji...@apache.org>]

Petr Kadlec created CXF-8827:
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             Summary: Reusing of JAX-RS Client causes memory leak
                 Key: CXF-8827
                 URL: https://issues.apache.org/jira/browse/CXF-8827
             Project: CXF
          Issue Type: Bug
          Components: JAX-RS
            Reporter: Petr Kadlec


The [JAX-RS Client Javadoc|https://docs.oracle.com/javaee/7/api/javax/ws/rs/client/Client.html] states:

{quote}Clients are heavy-weight objects that manage the client-side communication infrastructure. Initialization as well as disposal of a Client instance may be a rather expensive operation. It is therefore advised to construct only a small number of Client instances in the application. Client instances must be properly closed before being disposed to avoid leaking resources.{quote}

However, in CXF, this is impossible. On every call to {{target}}, {{ClientImpl}} creates a fresh {{WebTargetImpl}} which then (during {{request}}) creates a {{WebClient}} instance _and registers it within its parent_. This {{baseClients}} collection only grows as long as the shared {{Client}} instance exists and is closed and released only when {{close}} is called on it, so that sharing causes a memory leak which cannot be prevented in any way.



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