How can I put a HashMap as an input in a Java Web Service?

As a side note, if you are writing a new webservice, you should consider using a moderately recent technology. Jax-rpc is very outdated and uses soap encodings that are very painful to work with. Consider using jax-ws (built into the jdk these days) or some other webservices implementation which uses document-literal encoding.

Web services are supposed to be interoperable across programming languages and java.util. Map is Java-specific. You should write a facade for that method that converts the contents of the Map into an array.

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