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JDK 20 - java.net.URL parsing fix & behavior change

Before JDK 20, some of the parsing/validation performed by the JDK built-in URLStreamHander implementations were delayed until URL::openConnection or URLConnection::connect was called. Starting JDK 20, some of these parsing/validations are now performed early, i.e. within URL constructors.

An exception caused by a malformed URL that would have been delayed until the connection was opened or connected may starting JDK 20, throw a MalformedURLException at URL construction time.

Call to Action

We suggest testing your codebase against this change. And for those who want to rely on the old behavior, a new system property has been introduced to revert, on the command line, to the previous behavior.

More Information

• JDK-8293590 Some syntax checks performed by URL.openConnection() could be performed earlier, at URL construction
• JDK-8295750 Release Note

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