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http://issues.apache.org/bugzilla/show_bug.cgi?id=38747 Summary: Ant class loaders do not prevent delegation in isolated mode when retreiving resources, but do so when loading classes Product: Ant Version: 1.6.5 Platform: All OS/Version: All Status: NEW Severity: normal Priority: P2 Component: Core AssignedTo: [email protected] ReportedBy: [EMAIL PROTECTED] The AntClassLoader continues to delegate to the parent classloader when retreiving resources via the getResource() or getResourceAsStream() APIs, even though it blocks this delegation when loading classes. This inconsistency in retreiving resources and loading classes leads to issues where the Ant distribution provides any service implementations using the Service API (specified in the JAR file specification : http://java.sun.com/j2se/1.4.2/docs/guide/jar/jar.html#Service%20Provider ). A good example is the Xerces parser distributed with Ant. It uses the Services mechanism to indicate the parser implementation. The problem arises, for example, when running a Java application that instantiates a JAXP parser through an Ant java task. You would run into a ParserConfigurationError unless you set fork to true on the java task, or included the xerces libraries in the <classpath> element for the java task. The reason for this issues appears to be because the Ant classloader created for the java task is running in isolated mode. However, it still does delegate to the parent classloader (the Ant coreloader) when attempting to retreive resources. When instantiating the parser factory, the JAXP implementation attempts to locate the right factory to instantiate by searching for (amongst other things), the resource META-INF/services/javax.xml.parsers.SAXParserFactory (DocumentBuilderFactory) in the classpath. This is available to the parent coreloader from the xercesImpl.jar in ANT_HOME/lib, and is retreivable by the AntClassLoader even in the isolated mode. Next, it attempts to load the Factory class, which it fails to do, because it cannot now delegate to the coreloader. -- Configure bugmail: http://issues.apache.org/bugzilla/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug, or are watching the assignee. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
