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- <title>AspectJ 1.9.8 Readme</title>
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- <div align="right"><small>© Copyright 2021 Contributors. All rights reserved.</small></div>
-
- <h1>AspectJ 1.9.8</h1>
-
- <p>
- Please note that Bugzilla for issue management is deprecated and new issues should be filed as
- <a href="https://github.com/eclipse/org.aspectj/issues/new">GitHub issues</a>.
- The list of issues addressed for 1.9.8 can be found
- <a href="https://bugs.eclipse.org/bugs/buglist.cgi?bug_status=RESOLVED&bug_status=VERIFIED&bug_status=CLOSED&f0=OP&f1=OP&f3=CP&f4=CP&j1=OR&list_id=16866879&product=AspectJ&query_format=advanced&target_milestone=1.9.8">here for Bugzilla</a>
- and <a href="https://github.com/eclipse/org.aspectj/issues?q=is%3Aissue+is%3Aclosed++milestone%3A1.9.8">here for GitHub issues</a>.
- </p>
-
- <h2>New features</h2>
-
- <p>
- AspectJ 1.9.8 supports <a href="https://openjdk.java.net/projects/jdk/17/">Java 17</a> and its final and preview
- features, such as:
- </p>
- <ul>
- <li>Sealed classes (final in Java 17, previews in Java 15, 16 and AspectJ 1.9.7)</li>
- <li>Pattern matching for <tt>switch</tt></li>
- </ul>
- <p>
- For features marked as preview on a given JDK, you need to compile with <tt>ajc --enable-preview</tt> and run with
- <tt>java --enable-preview</tt> on that JDK.
- </p>
- <p>
- Please note that you cannot run code compiled with preview features on any other JDK than the one used for
- compilation. For example, records compiled with preview on JDK 15 cannot be used on JDK 16 without recompilation. This
- is a JVM limitation unrelated to AspectJ. Also, e.g. sealed classes are preview-1 on JDK 15 and preview-2 on JDK 16.
- You still need to recompile, no matter what.
- </p>
-
- <h2>Improvements</h2>
-
- <p>
- The <tt>--release N</tt> compiler option for correct cross-compilation to previous JDK bytecode + API versions is now
- supported by AJC. Previously, the option existed (inherited by ECJ) but did not work correctly.
- </p>
-
- <h2>Code examples</h2>
-
- <p>
- You can find some sample code in the AspectJ test suite under the respective AspectJ version in which the features
- were first supported (possibly as JVM preview features):
- </p>
- <ul>
- <li>
- <a href="https://github.com/eclipse/org.aspectj/tree/master/tests/features198/compiler_release">
- Cross-compilation to legacy JDK
- </a>:
- An example class which only works correctly on JDK 8 when compiled with <tt>--release 8</tt> due to API changes in
- the JDK. Simply <tt>-source 8 -target 8</tt> would not be enough in this case.</li>
- <li>
- <a href="https://github.com/eclipse/org.aspectj/tree/master/tests/features198/java17">
- Pattern matching for switch
- </a>
- </li>
- </ul>
-
- <h2>Using LTW on Java 16+</h2>
-
- <p>
- Please note that if you want to use load-time weaving on Java 16+, the weaving agent collides with
- <a href="https://openjdk.java.net/jeps/396">JEP 396 (Strongly Encapsulate JDK Internals by Default)</a>. Therefore,
- you need to set the JVM parameter <tt>--add-opens java.base/java.lang=ALL-UNNAMED</tt> in order to enable aspect
- weaving. This is due to the fact that the weaver uses internal APIs for which we have not found an adequate
- replacement yet when defining classes in different classloaders.
- </p>
-
- <h2>Other changes and bug fixes</h2>
-
- <ul>
- <li>
- The AspectJ compiler <tt>ajc</tt> (contained in the <tt>aspectjtools</tt> library) no longer works on JDKs 8 to 10. The minimum
- compile-time requirement is now JDK 11 due to upstream changes in the Eclipse Java Compiler (subset of JDT Core),
- which AspectJ is a fork of. You can still compile to legacy target versions as low as Java 1.3 when compiling plain
- Java code or using plain Java ITD constructs which do not require the AspectJ runtime <tt>aspectjrt</tt>, but the compiler
- itself needs JDK 11+. Just like in previous AspectJ versions, both the runtime <tt>aspectjrt</tt> and the load-time weaver
- <tt>aspectjweaver</tt> still only require JRE 8+.
- </li>
- <li>Document build profiles and properties in <i>docs/developer/BUILD.md</i></li>
- <li>Add a guide for setting up an AspectJ development environment in <i>docs/developer/IDE.md</i></li>
- <li>Allow JAR saving if <tt>-proceedOnError</tt> is specified</li>
- </ul>
-
- <p>
- Available: 1.9.8 available DD-MMM-2021
- </p>
-
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