[BUG][JAVA] When using java and library native I get syntax error

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
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Description

When trying to generate .java files from Unleash OpenAPI specs (file attached), I get errors using OpenAPI Generator with java native library. It seems that it generates the method names that are not valid for Java syntax. I use java native because I want the client to be java.net.http.HttpClient.

Command I use:
openapi-generator generate -i unleash.openapi.json -g java -o test --additional-properties=serializationLibrary=jackson,library=native

Example error I get when I try to compile the code:

.../AdvancedPlaygroundRequestSchemaProjects.java:228: error: unexpected token: <
    public List<String> getList<String>() throws ClassCastException {
                               ^

Multiple files have this issue.

openapi-generator version

7.17.0

OpenAPI declaration file content or url

unleash.openapi.json

Start by running the reported openapi-generator command with the attached unleash.openapi.json and inspect the generated AdvancedPlaygroundRequestSchemaProjects.java and other failing files. Compare the generated accessor names with valid Java syntax; done means the native Java client generated from this specification compiles without syntax errors.