hc-dev | Zhihong Zhang (JIRA) | 8 years ago
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    The HttpClient throws NullPointerException in the main thread when an invalid port (like 80001) is used in the URL. An IllegalArgumentException is thrown in TimeoutGuard thread. Exception in thread "Timeout guard" java.lang.IllegalArgumentException: port out of range:80001 at<init>( at<init>( at org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket( at org.apache.commons.httpclient.protocol.ControllerThreadSocketFactory$1.doit( at org.apache.commons.httpclient.protocol.ControllerThreadSocketFactory$ at Exception in thread "main" java.lang.NullPointerException at at org.apache.commons.httpclient.MultiThreadedHttpConnectionManager$ at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry( at org.apache.commons.httpclient.HttpMethodDirector.executeMethod( at org.apache.commons.httpclient.HttpClient.executeMethod( at org.apache.commons.httpclient.HttpClient.executeMethod( at$PoolingHttpConnector.doGet( at It should throw a checked exception in main thread so caller can handle the error condition more gracefully. The test program is attached. This is caused by a race condition and it's not always reproducible. Running in debugger shows a different behavior. package; import; import org.apache.commons.httpclient.HttpClient; import org.apache.commons.httpclient.HttpStatus; import org.apache.commons.httpclient.MultiThreadedHttpConnectionManager; import org.apache.commons.httpclient.methods.GetMethod; import org.apache.commons.httpclient.params.HttpConnectionManagerParams; public class HttpTest { public static void main(String[] args) { PoolingHttpConnector conn = new PoolingHttpConnector(); try { String response = conn.doGet(""); System.out.println("Response='" + response + "'"); } catch (IOException e) { e.printStackTrace(); } } static class PoolingHttpConnector { public static final int MAX_TOTAL_CONNECTIONS = 16; public static final int MAX_CONNECTIONS_PER_HOST = 8; public static final int CONNECT_TIMEOUT = 5000; public static final int SOCKET_TIMEOUT = 5000; public static final boolean TCP_NO_DELAY = true; private static MultiThreadedHttpConnectionManager poolManager; private static HttpConnectionManagerParams httpParams; private static HttpClient httpClient; private static boolean initialized = false; public PoolingHttpConnector() { initialize(); } public String doGet(String url) throws IOException { GetMethod method = new GetMethod(url); try { int status = httpClient.executeMethod(method); String response = new String(method.getResponseBody()); if (status != HttpStatus.SC_OK) throw new IOException("HTTP error: " + response); return response; } finally { method.releaseConnection(); } } private synchronized void initialize() { if (initialized) return; poolManager = new MultiThreadedHttpConnectionManager(); httpParams = new HttpConnectionManagerParams(); httpParams.setMaxTotalConnections(MAX_TOTAL_CONNECTIONS); httpParams.setDefaultMaxConnectionsPerHost(MAX_CONNECTIONS_PER_HOST); httpParams.setTcpNoDelay(TCP_NO_DELAY); httpParams.setSoTimeout(SOCKET_TIMEOUT); httpParams.setConnectionTimeout(CONNECT_TIMEOUT); poolManager.setParams(httpParams); httpClient = new HttpClient(poolManager); initialized = true; } } }

    Apache's JIRA Issue Tracker | 8 years ago | Zhihong Zhang
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    Root Cause Analysis

    1. java.lang.NullPointerException

      No message provided

    2. HttpClient
      2. org.apache.commons.httpclient.MultiThreadedHttpConnectionManager$
      3. org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(
      4. org.apache.commons.httpclient.HttpMethodDirector.executeMethod(
      5. org.apache.commons.httpclient.HttpClient.executeMethod(
      6. org.apache.commons.httpclient.HttpClient.executeMethod(
      6 frames
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