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<title>AspectJ 1.9.9 Readme</title>
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<div align="right"><small>&copy; Copyright 2022 Contributors. All rights reserved.</small></div>

<h1>AspectJ 1.9.9</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 1.9.9 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=1.9.9">here for Bugzilla</a>
  and <a href="https://github.com/eclipse/org.aspectj/issues?q=is%3Aissue+is%3Aclosed++milestone%3A1.9.9">here for GitHub issues</a>.
</p>

<h2>New features</h2>

<p>
  AspectJ 1.9.9 supports <a href="https://openjdk.java.net/projects/jdk/18/">Java 18</a> and its final and preview
  features, such as:
</p>
<ul>
  <li>Pattern matching for <tt>switch</tt> (preview 2)</li>
</ul>

<h2>Improvements</h2>

<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/java17">
      Pattern matching for switch, preview 1
    </a>
  </li>
  <li>
    <a href="https://github.com/eclipse/org.aspectj/tree/master/tests/features199/java18">
      Pattern matching for switch, preview 2
    </a>
  </li>
</ul>

<h2>Other changes and bug fixes</h2>

<ul>
  <li>
    Fix a bug which led to <tt>NullPointerException</tt>s if too many JAR archives were on the classpath. Too many here
    means the value system property <tt>org.aspectj.weaver.openarchives</tt> (1,000 by default). The AspectJ compiler is
    meant to close archives upon cache exhaustion and then re-open them if it needs them again later. Re-opening was
    broken, now the compiler works reliably even for cache sizes as small as 20. See issue
    <a href="https://github.com/eclipse/org.aspectj/issues/125">#125</a>.
  </li>
  <li>
    Improvements for <tt>if()</tt> pointcuts in annotation syntax, see issues
    <a href="https://github.com/eclipse/org.aspectj/issues/115">#115</a>,
    <a href="https://github.com/eclipse/org.aspectj/issues/120">#120</a>,
    <a href="https://github.com/eclipse/org.aspectj/issues/122">#122</a>.
  </li>
  <li>
    Thanks to Andrey Turbanov for several clean code contributions.
  </li>
</ul>

<h2>AspectJ usage hints</h2>

<h3>AspectJ compiler build system requirements</h3>

<p>
  Since 1.9.7, 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+.
</p>

<h3>Use LTW on Java 16+</h3>

<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> and related
  subsequent JEPs. 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>

<h3>Compile with Java preview features</h3>

<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>

<hr>

<p>
  <b>Available:</b> 1.9.9 available DD-MMM-2022
</p>

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