Modify your wsdl2java.bat file to pass on keystore file and password to jvm which would look something like below
"%JAVA_HOME%\bin\java" -Djavax.net.ssl.trustStore="{keystorefile}" -Djavax.net.ssl.trustStorePassword="{password}" -Djavax.net.ssl.keyStoreType="jks" -Dorg.jboss.security.ignoreHttpsHost="true" -Xmx128M -Djava.endorsed.dirs="%CXF_HOME%\lib\endorsed" -cp "%CXF_JAR%;%TOOLS_JAR%;%CLASSPATH%" -Djava.util.logging.config.file="%CXF_HOME%\etc\logging.properties" org.apache.cxf.tools.wadlto.WADLToJava %*
The other option is import certificate to your jdks jdk's security directory using keytool