I am using sendhttp node and using https POST I keep getting this error in

...ime.framework.DefaultActivityExecutor.execute(DefaultActivityExecutor.java:98)
          at com.appiancorp.process.engine.UnattendedJavaActivityRequest.execute(UnattendedJavaActivityRequest.java:83)
          at com.appiancorp.process.engine.UnattendedJavaActivityRequest.execute0(UnattendedJavaActivityRequest.java:55)

It seems you have an extra header name that doesn't have a header value.

Looking at the source code of this plug-in here is where it is failing:

if (headerNames_ != null) {
                              for (int h = 0; h < headerNames_.length; h++) {
                                        m.addRequestHeader(headerNames_[h], headerValues_[h]);

which makes me think you have two header names in the headerNames field but you only have one header value in the headerValue input.

Remember the number of header names needs to match the number of header values. If using an expression ={} make sure both arrays are of the same length.

Thanks Eduardo. one solved and something else. i fixed the header issue, it was the headername constant not being multiple and values are multiple
we did install the certificates using the commandline keytool , the certs are also seen using keytool -list etc. but Appian/Jboss complains that path not found when called from appian model. does SendHttp node need cert path or name etc?
2013-12-23 18:02:30,412 [default-short-running-threads-threads - 10] ERROR com.appiancorp.process.runtime.activities.HttpRequestActivityNTLM - javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
          at sun.security.ssl.Alerts.getSSLException(Alerts.java:192)
          at sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1886)

I am not sure if this plug-in allows you to call web services that require a certificate.

You may ask that in separate post for the author to confirm.