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src/java.base/share/classes/java/lang/module/Configuration.java
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@@ -40,12 +40,14 @@
import java.util.Optional;
import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.Stream;
+import jdk.internal.misc.VM;
import jdk.internal.module.ModuleReferenceImpl;
import jdk.internal.module.ModuleTarget;
+import jdk.internal.vm.annotation.Stable;
/**
* A configuration that is the result of <a href="package-summary.html#resolution">
* resolution</a> or resolution with
* <a href="{@docRoot}/java.base/java/lang/module/Configuration.html#service-binding">service binding</a>.
@@ -102,11 +104,21 @@
* @see java.lang.ModuleLayer
*/
public final class Configuration {
// @see Configuration#empty()
- private static final Configuration EMPTY_CONFIGURATION = new Configuration();
+ // EMPTY_CONFIGURATION may be initialized from the CDS archive.
+ private static @Stable Configuration EMPTY_CONFIGURATION;
+
+ static {
+ // Initialize EMPTY_CONFIGURATION from the archive.
+ VM.initializeFromArchive(Configuration.class);
+ // Create a new empty Configuration if there is no archived version.
+ if (EMPTY_CONFIGURATION == null) {
+ EMPTY_CONFIGURATION = new Configuration();
+ }
+ }
// parent configurations, in search order
private final List<Configuration> parents;
private final Map<ResolvedModule, Set<ResolvedModule>> graph;
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