Wednesday, March 2, 2011

RESTEasy - Connection Release Problems

If you are using RESTEasy client framework, and returning a Response from your service method, you will explicitly need to release the connection.

Here is the stack trace you will see, if the connection isn't released.

Exception in thread "main" java.lang.RuntimeException: java.lang.IllegalStateException: Invalid use of SingleClientConnManager: connection still allocated.
Make sure to release the connection before allocating another one.
at org.jboss.resteasy.client.core.ClientInvoker.invoke(ClientInvoker.java:101)
at org.jboss.resteasy.client.core.ClientProxy.invoke(ClientProxy.java:72)
at $Proxy25.updateSubmission(Unknown Source)
at meera.rest.main.MYRestWorkflow.main(MYRestWorkflow.java:61)
Caused by: java.lang.IllegalStateException: Invalid use of SingleClientConnManager: connection still allocated.
Make sure to release the connection before allocating another one.
at org.apache.http.impl.conn.SingleClientConnManager.getConnection(SingleClientConnManager.java:199)
at org.apache.http.impl.conn.SingleClientConnManager$1.getConnection(SingleClientConnManager.java:173)
at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:390)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:641)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:576)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:554)
at org.jboss.resteasy.client.core.executors.ApacheHttpClient4Executor.execute(ApacheHttpClient4Executor.java:86)
at org.jboss.resteasy.core.interception.ClientExecutionContextImpl.proceed(ClientExecutionContextImpl.java:39)
at org.jboss.resteasy.plugins.interceptors.encoding.AcceptEncodingGZIPInterceptor.execute(AcceptEncodingGZIPInterceptor.java:40)
at org.jboss.resteasy.core.interception.ClientExecutionContextImpl.proceed(ClientExecutionContextImpl.java:45)
at org.jboss.resteasy.client.ClientRequest.execute(ClientRequest.java:449)
at org.jboss.resteasy.client.ClientRequest.httpMethod(ClientRequest.java:679)
at org.jboss.resteasy.client.core.ClientInvoker.invoke(ClientInvoker.java:97)
... 3 more
------------------------------------------------------------------------
[ERROR]BUILD ERROR
------------------------------------------------------------------------

So, in order to fix this issue, RESTEasy has a method for releasing the connections which can be done using the following code:
MyResource resource = MyProxyFactory.create(MyResource.class, "resourcePath");
ClientResponse response = (ClientResponse) resource.create();
//Any REST Resource which returns a ClientResponse, has to call releaseConnection to release all the connections back
//to the connection pool
response.releaseConnection();

1 comment:

  1. Just what I was looking for. Thank you.

    ReplyDelete