classloader

问题 When using Scala RemoteActors I was getting a ClassNotFoundException that referred to scala.actors.remote.NetKernel. I copied someone else's example and added RemoteActor.classLoader = getClass.getClassLoader to my Actor and now everything works. Why is this necessary? 回答1: Remote Actors use Java serialization to send messages back and forth. Inside the actors library, you'll find a custom object input stream ( https://lampsvn.epfl.ch/trac/scala/browser/scala/trunk/src/actors/scala/actors

问题 When using Scala RemoteActors I was getting a ClassNotFoundException that referred to scala.actors.remote.NetKernel. I copied someone else's example and added RemoteActor.classLoader = getClass.getClassLoader to my Actor and now everything works. Why is this necessary? 回答1: Remote Actors use Java serialization to send messages back and forth. Inside the actors library, you'll find a custom object input stream ( https://lampsvn.epfl.ch/trac/scala/browser/scala/trunk/src/actors/scala/actors

问题 I'm trying to build a generic class loader. I need to check classes that I load against a method argument to determine if they are of the same class. The code mostly explains what I'm trying to do. private static LinkedList<Object> loadObjectsInDirectory(Class class0, File dir) throws ClassNotFoundException { LinkedList<Feature> objects = new LinkedList<Object>(); ClassLoader cl = new GenericClassLoader(); for(String s : dir.list()) { Class class1 = cl.loadClass(s); try { Object x = class1

问题 This question already has answers here : Java, Classpath, Classloading => Multiple Versions of the same jar/project (5 answers) Closed 5 years ago . I have three Jar files.All jar files contain Same class TestServicesImpl And Same Method displayWeLcomeMessage() But having different messages(output) of displayWeLcomeMessage(). Example : public void displayWeLcomeMessage() { System.out.println("wecome msg of JAR version first"); } public void displayWeLcomeMessage() { System.out.println("wecome

问题 I have use log4j-1.2.17 bundle from Maven repo. I try to do this code in the bundle (my bundle calls to the log4j-1.2.17 bundle) PropertyConfigurator.configure(props()); private static Properties props() { Properties props = new Properties(); props.put("log4j.rootLogger", "INFO, R"); props.put("log4j.appender.R", "org.apache.log4j.DailyRollingFileAppender"); props.put("log4j.appender.R.File", "logs/IhtikaClient.log"); props.put("log4j.appender.R.Append", "true"); props.put("log4j.appender.R

问题 When reading the answer to this question, I was wondering how Java7 bootstrap knows about the presence of public static void main(String[] args) method, without running the static initializers ? I have some assumptions on this topic, but some of them is obviously wrong: Java Bootstrap is running in JVM, so it can only use standard JVM features (no native features) - the called class must be on CLASSPATH, for example The standard JVM classloading is done via the normal classloading mechanism

问题 I got a factory, where Action Script follows an xml and builds DisplayObject hierarchy out of it. It is meant that script doesn't know beforehand what elements it will encounter in xml and therefore doesn't know what user-defined factory classes it will need. I know that it is possible to do something like this: var rect:*, className:String = "flash.geom.Rectangle"; if (ApplicationDomain.currentDomain.hasDefinition(className)) { rect = new(getDefinitionByName(className)); } And Rectangle

问题 Sorry, maybe this question is too silly or already answered, but I couldn't find it out. I'm wondering if there is some known Java class-loader that is able to accept remote files in the classpath, i.e., entries like CLASSPATH="http://somewhere.net/library.jar:...". Note that I am not talking about applets or Java Web Start. Think of an application that can use different back-ends (e.g., MySQL, Oracle), I'd like to prepare the classpath in a shell script, based on the user's back-end

问题 I'm seeing differences across platforms about when Class.forName() throws ClassNotFoundException and when it throws NoClassDefFoundError. Is this behavior well-defined somewhere, or have I stumbled across a bug? Consider the following code (which is a standalone java file in the default package): public class DLExceptionType { private static void printFindError(String name) { System.out.print(name + ": "); try { Class.forName(name); System.out.println("** no error **"); } catch (Throwable e)

问题 While loading a dll file, I am getting the following exception: Exception in thread "main" java.lang.UnsatisfiedLinkError: D:\Transliteration\rlpnc-3.1.0-sdk-ia32-w32-msvc80\rlp\bin\ia32-w32-msvc80\btrntjni.dll: The system cannot find message text for message number 0x%1 in the message file for %2 at java.lang.ClassLoader$NativeLibrary.load(Native Method) at java.lang.ClassLoader.loadLibrary0(Unknown Source) at java.lang.ClassLoader.loadLibrary(Unknown Source) at java.lang.Runtime.load0