why does mcp tools say that the value is null when it is provided

Here is how I am using mcptools to access my springboot mcp-server:

Tool is:
`@Tool(name = "searchPeopleByName", description = "Search for people by name")
public List searchPeopleByName(String name) {`

` mcp call searchPeopleByName --params '{"name":"John"}' java -jar ./target/springboot-mcp-server-1.0-SNAPSHOT.jar `

Here is what mcptools returns:
**Cannot invoke "String.toLowerCase()" because "name" is null**

The same goes for getting a person by ID
`@Tool(name = "getPersonById", description = "Find a person by their ID")
public Person getPersonById(Long id) {`

`mcp call getPersonById --params '{"id": 1}' java -jar ./target/springboot-mcp-server-1.0-SNAPSHOT.jar`

Here is the response:
**Cannot invoke "Object.hashCode()" because "key" is null**

When I test this code using springboot-mcp-client, all these methods work as specified. However, I want the capability of testing mcp-servers using stdio on the CLI. I was hoping your tool would help. However, other than the most simple commands that take no params, all it says is that the key is null.

Any help would be appreciated.