JDK-8279866 : Release Note: Indy String Concat Changes Order of Operations
  • Type: Sub-task
  • Component: tools
  • Sub-Component: javac
  • Affected Version: 8u441-perf,17.0.14-oracle,19
  • Priority: P3
  • Status: Resolved
  • Resolution: Delivered
  • Submitted: 2022-01-11
  • Updated: 2024-12-05
  • Resolved: 2022-05-03
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JDK 17 JDK 19 JDK 8
17.0.14-oracleResolved 19Resolved 8u441-perfResolved
Description
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](http://openjdk.java.net/jeps/280).

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

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