调用rest地址时异常：Invalid use of BasicClientConnManager: connection still allocated.

Caused by: java.lang.IllegalStateException: Invalid use of BasicClientConnManager: connection still allocated.

 Make sure to release the connection before allocating another one.

使用Resteasy进行restful方式调用时出现上面的异常，原因大概是由于HttpClient做多线程rest调用导致。代码是：

RegisterBuiltin.register(ResteasyProviderFactory.getInstance());
yourClassName = ProxyFactory.create(yourClassName.class, url);

改为：

ClientConnectionManager cm = new ThreadSafeClientConnManager();
HttpClient httpClient = new DefaultHttpClient(cm);
ClientExecutor executor = new ApacheHttpClient4Executor(httpClient);
RegisterBuiltin.register(ResteasyProviderFactory.getInstance());
yourClassName = ProxyFactory.create(yourClassName.class, url, executor);

即可解决上面的异常问题