RELEASE NOTES: JDK 11.0.27

Indy String Concat Changes Order of Operations

String concatenation has been changed to evaluate each argument and eagerly convert it to a string, in left-to-right order. This fixes a bug in the invokedynamic-based string concatentation strategies introduced in JEP 280.

For example, the following now prints "foofoobar", not "foobarfoobar":

` StringBuilder builder = new StringBuilder("foo"); System.err.println("" + builder + builder.append("bar")); `

New jar command option to not overwrite existing files

The jar tool's extract operation has been enhanced to allow the --keep-old-files or the -k options to be used to preventing overwriting existing files.

Example Usages:

jar xkf foo.jar

or

jar --extract --keep-old-files --file foo.jar

Either of these commands will extract the foo.jar, and if an entry with the same name already exist in the target directory, then the existing file will not be overwritten.