How to Handle Truncated Path Variables with Special Characters in Spring MVC @PathVariable?

Addressing Truncated Path Variables in Spring MVC with @PathVariable

Problem:

While utilizing Spring MVC with @PathVariable for RESTful API development, it has been observed that path variables containing special characters are getting truncated. Specifically, when a path variable like "blah2010.08.19-02:25:47" is provided, only the portion up to the first period (i.e., "blah2010.08") is being captured by @PathVariable.

Cause:

By default, Spring MVC treats @PathVariable arguments as simple strings and expects them to follow certain URL parameter formatting rules. These rules include restrictions on characters allowed in path variables, with special characters like periods and hyphens being interpreted as value delimiters. Consequently, Spring truncates the path variable at the first instance of an invalid character.

Solution:

To prevent Spring from truncating @PathVariable values, it is necessary to explicitly specify that the argument should accept a broader range of characters. This can be achieved by using a regular expression in the @RequestMapping annotation.

For example, to allow path variables to contain periods, hyphens, and other special characters, the following regular expression can be used:

@RequestMapping(method = RequestMethod.GET, value = Routes.BLAH_GET + "/{blahName:.+}")

The ". " suffix in the regular expression indicates that the {blahName} path variable should match any non-empty string, effectively capturing all characters in the provided path.

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