java - Mysterious ClasscastException from apache httpclient code -


we using apache's commons-httpclient-3.1 library in our project. however, due legacy , other project specific dependencies not using of implementations of secureprotocolsocketfactory interface provided apache (like sslprotocolsocketfactory,strictsslprotocolsocketfactory) have created our own socketfactory called httpclient3xsocketfactory implements secureprotocolsocketfactory interface.this factory registered apache calling protocol.registerprotocol method of org.apache.commons.httpclient.protocol.protocol.java. given below snippet of our code

public class httpclient3xsocketfactory implements secureprotocolsocketfactory { . . .  private static final protocolsocketfactory socketfactory = new httpclient3xsocketfactory(); private static final protocol httpsproto = new protocol("https",         socketfactory, 443);

and registered below 

protocol.registerprotocol("https", httpsproto);

however generates mysterious classcastexception tunnelcreated() method of apache's httpconnection last line

 if (usingsecuresocket) {         throw new illegalstateexception("already using secure socket");     }  if (log.isdebugenabled()) {         log.debug("secure tunnel " + this.hostname + ":" + this.portnumber);     }  secureprotocolsocketfactory socketfactory =         (secureprotocolsocketfactory) protocolinuse.getsocketfactory();

the exception says --

caused by: java.lang.classcastexception: com.vmware.vdi.common.saml.httpclient3xsocketfactory cannot cast org.apache.commons.httpclient.protocol.secureprotocolsocketfactory @ org.apache.commons.httpclient.httpconnection.tunnelcreated(httpconnection.java:791) @ org.apache.commons.httpclient.httpmethoddirector.executeconnect(httpmethoddirector.java:528) @ org.apache.commons.httpclient.httpmethoddirector.executewithretry(httpmethoddirector.java:404) @ org.apache.commons.httpclient.httpmethoddirector.executemethod(httpmethoddirector.java:178) @ org.apache.commons.httpclient.httpclient.executemethod(httpclient.java:408) @ org.apache.commons.httpclient.httpclient.executemethod(httpclient.java:327)

but com.vmware.vdi.common.saml.httpclient3xsocketfactory implement org.apache.commons.httpclient.protocol.secureprotocolsocketfactory interface. have verified using getclassloader method both loaded using same class loader. used reflection @ run time check com.vmware.vdi.common.saml.httpclient3xsocketfactory implement org.apache.commons.httpclient.protocol.secureprotocolsocketfactory interface. @ loss understand why classcaseexception generated.


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