ClassCastException in client proxy cannot cast Ljava.lang.Object to
Ljava.lang.String
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Key: XMLRPC-178
URL: https://issues.apache.org/jira/browse/XMLRPC-178
Project: XML-RPC
Issue Type: Bug
Components: Releases
Affects Versions: 3.1.2
Environment: Windows Server 2003
Reporter: Chris Cooper
I have a fairly simple client server application. One of my exposed server
methods returns a String[]. I am getting a ClassCastException on the client
side when getting the result. The class cast exception occurs in
ClientFactory.class in the newInstance function. I am stepping through the
code, and it happens on the line "return typeConverter.convert(result);".
Stepping into this function hasn't really helped as it causes the
ClassCastException. I am not sure what the problem is, on the server side I
have debugged and determined that my function is indeed returning a String[] as
it should be, but for some reason when it comes over to the client side there
is a problem. I can post you the stack trace:
Exception in thread "main" java.lang.ClassCastException: [Ljava.lang.Object;
cannot be cast to [Ljava.lang.String;
at $Proxy1.getInstances(Unknown Source)
at
com.rsa.grinderbot.controller.perfmon.WindowsProxy.getInstances(WindowsProxy.java:46)
-> this is the proxy object calling my server's function
at
com.rsa.grinderbot.controller.perfmon.WindowsStats.<init>(WindowsStats.java:37)
at
com.rsa.grinderbot.controller.perfmon.PerformanceMonitor.<init>(PerformanceMonitor.java:33)
at com.rsa.grinderbot.controller.Controller.run(Controller.java:268)
at com.rsa.grinderbot.controller.Controller.main(Controller.java:333)
Here is my constructor that creates the proxy object using the client factory.
public WindowsProxy(Server server) {
this.server = server;
XmlRpcClientConfigImpl config = new XmlRpcClientConfigImpl();
try {
config.setServerURL(new URL("http://"; +
server.getHostname() + ":" + server.getPort() + "/xmlrpc"));
config.setReplyTimeout(0);
config.setConnectionTimeout(0);
XmlRpcClient client = new XmlRpcClient();
client.setConfig(config);
ClientFactory factory = new ClientFactory(client);
windows = (WindowsServerAPI)
factory.newInstance(WindowsServerAPI.class);
} catch (MalformedURLException e) {
//TODO log4j
e.printStackTrace();
}
}
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