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jdk/src/java.base/share/classes/java/lang/ClassLoader.java
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@@ -220,10 +220,13 @@
// The parent class loader for delegation
// Note: VM hardcoded the offset of this field, thus all new fields
// must be added *after* it.
private final ClassLoader parent;
+ // class loader name
+ private final String name;
+
// the unnamed module for this ClassLoader
private final Module unnamedModule;
/**
* Encapsulates the set of parallel capable loader types.
@@ -336,11 +339,15 @@
security.checkCreateClassLoader();
}
return null;
}
- private ClassLoader(Void unused, ClassLoader parent) {
+ private ClassLoader(Void unused, String name, ClassLoader parent) {
+ if (name != null && name.isEmpty()) {
+ throw new IllegalArgumentException("name must be non-empty or null");
+ }
+ this.name = name;
this.parent = parent;
this.unnamedModule
= SharedSecrets.getJavaLangReflectModuleAccess()
.defineUnnamedModule(this);
if (ParallelLoaders.isRegistered(this.getClass())) {
@@ -354,10 +361,31 @@
assertionLock = this;
}
}
/**
+ * Creates a new class loader of the specified name and using the
+ * specified parent class loader for delegation.
+ *
+ * @param name class loader name; or {@code null} if not named
+ * @param parent the parent class loader
+ *
+ * @throws IllegalArgumentException if the given name is empty.
+ *
+ * @throws SecurityException
+ * If a security manager exists and its
+ * {@link SecurityManager#checkCreateClassLoader()}
+ * method doesn't allow creation of a new class loader.
+ *
+ * @since 9
+ */
+ protected ClassLoader(String name, ClassLoader parent) {
+ this(checkCreateClassLoader(), name, parent);
+ }
+
+
+ /**
* Creates a new class loader using the specified parent class loader for
* delegation.
*
* <p> If there is a security manager, its {@link
* SecurityManager#checkCreateClassLoader()
@@ -373,13 +401,14 @@
* of a new class loader.
*
* @since 1.2
*/
protected ClassLoader(ClassLoader parent) {
- this(checkCreateClassLoader(), parent);
+ this(checkCreateClassLoader(), null, parent);
}
+
/**
* Creates a new class loader using the <tt>ClassLoader</tt> returned by
* the method {@link #getSystemClassLoader()
* <tt>getSystemClassLoader()</tt>} as the parent class loader.
*
@@ -392,11 +421,35 @@
* If a security manager exists and its
* <tt>checkCreateClassLoader</tt> method doesn't allow creation
* of a new class loader.
*/
protected ClassLoader() {
- this(checkCreateClassLoader(), getSystemClassLoader());
+ this(checkCreateClassLoader(), null, getSystemClassLoader());
+ }
+
+
+ /**
+ * Returns the name of this class loader or {@code null} if
+ * this class loader is not named.
+ *
+ * @apiNote This method is non-final for compatibility. If this
+ * method is overridden, this method must return the same name
+ * as specified when this class loader was instantiated.
+ *
+ * @return name of this class loader; or {@code null} if
+ * this class loader is not named.
+ *
+ * @since 9
+ */
+ public String getName() {
+ return name;
+ }
+
+ // package-private used by StackTraceElement to avoid
+ // calling the overrideable getName method
+ final String name() {
+ return name;
}
// -- Class --
/**
@@ -1626,10 +1679,13 @@
/**
* Returns the platform class loader for delegation. All
* <a href="#builtinLoaders">platform classes</a> are visible to
* the platform class loader.
*
+ * @implNote The name of the builtin platform class loader is
+ * {@code "platform"}.
+ *
* @return The platform {@code ClassLoader}.
*
* @throws SecurityException
* If a security manager is present, and the caller's class loader is
* not {@code null}, and the caller's class loader is not the same
@@ -1679,11 +1735,12 @@
* @implNote The system property to override the system class loader is not
* examined until the VM is almost fully initialized. Code that executes
* this method during startup should take care not to cache the return
* value until the system is fully initialized.
*
- * <p> The class path used by the built-in system class loader is determined
+ * <p> The name of the built-in system class loader is {@code "app"}.
+ * The class path used by the built-in system class loader is determined
* by the system property "{@code java.class.path}" during early
* initialization of the VM. If the system property is not defined,
* or its value is an empty string, then there is no class path
* when the initial module is a module on the application module path,
* i.e. <em>a named module</em>. If the initial module is not on
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