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This looks like a Java SDK bug rather than anything AWS specific.
Firstly do raise an issue about this on the java repo, this _should_ just work.
As a workaround try setting targetHealthStates to an empty list (not null) in the builder and see if that helps.

Hi Fraser,
Thank you for the reply! I will raise the issue.

Which version of java should I use? I am getting the same error

Try changing the dependency versions in your pom.xml, at least these worked for me
&lt;dependency&gt;
            &lt;groupId&gt;com.pulumi&lt;/groupId&gt;
            &lt;artifactId&gt;pulumi&lt;/artifactId&gt;
            &lt;version&gt;0.9.5&lt;/version&gt;
        &lt;/dependency&gt;
        &lt;dependency&gt;
            &lt;groupId&gt;com.pulumi&lt;/groupId&gt;
            &lt;artifactId&gt;aws&lt;/artifactId&gt;
            &lt;version&gt;5.42.0&lt;/version&gt;
        &lt;/dependency&gt;