classloader

问题 I ' m programming with JSE and i'm loading a jar (that i do ) with another java program . The problem is in classLoader of java virtual machine i think . i said that beacuse i tried to exec the file jar with java -jar "file.jar" and it runs . I'm using xubuntu with eclipse. In eclipse, i have 2 project that respectively are the first software that loads jar and the jar software . To export the jar file i use the wizard "Export -> jar ecc...." How can i resolve this problem? Exception in

问题 how can I dynamically load a class in Java with two parameters which are the absolute filepath of the class file and the name of the method I wish to call? eg path: c:\foo.class method: print() I am just interested in the basics as a simple cmd line tool. A code example would b appreciated. cheers hoax 回答1: Check out this example: // Create a File object on the root of the directory containing the class file File file = new File("c:\\myclasses\\"); try { // Convert File to a URL URL url =

问题 From this question, I found that it is not possible to look up a class from a sun.misc.DelegatingClassLoader , i.e. looking up a class on its own class loader like Class<?> accessor = ... accessor.getClassLoader().findClass(accessor.getName()); throws a ClassNotFoundException . The delegating class loader is used for loading runtime-generated accessor classes for converting Java's reflective JNI calls into Java invocations. For some strange reason, I am not able to find the source of the

问题 i'm writing a custom classloader, i'have set it to be the default classloader by using the parameter -Djava.system.class.loader=MyClassLoader Most of the classes are loaded by my classloader, but some classes not, why? This classes are into an external jar file. UPDATE Here an example public class Main{ public static void main(String[] args) { try{ // A simple class loader, ovveride loadClass // method and print in stdout the name of the class loaded. MyClassLoader classLoader=new

问题 I have a java app that do some operation in a file and release output of results. and I want add a property that everyone that use my app can add his/her specific operator. and know i want to load class without knowing its name or methods. this is my class and i know the class and method name that might be added: public class PathGetter { public static void main(String[] args) { try{ String AbsolutePath = args[0]; AbsolutePath += "\\in.txt"; String SecondFilePath = args[1]; SecondFilePath +=

问题 I am writing a game engine in which I need to analyze every single class that is mentioned in my program. As this is a game engine, it is to be attached to a client's project as a JAR file. From within that JAR file I need to be able to scan every class that is being used by the client. So I thought that I should create a custom ClassLoader! By overriding ClassLoader I can take a look at every class that is being used as it is loaded. I started playing around a bit with ClassLoaders. Here is

问题 Continuously this thread: Failed to connect hypersonic(HSQLDB) DB on Apache 7.0 I need to know if there are some other new ways to use Class.forName() function. Is there a way to load a class from a certain jar ? 回答1: For JDBC and other services (in the sense of services to the application, not OSGI services), there is ServiceLoader which will load classes based on the classpath, and if any of the jar files on the classpath offer to provide "implementations" of the "abstract" service. Older

问题 I'm new to play! framework and using wsdl2java tools. I'm developing a play! application that needs to interact with a SOAP webservice. I have the WSDL and created objects from it using jaxws. It's creating a bunch of java classes and 1 interface. As soon as I try to make a webservice call, I get an error that the interface cannot be found by the classloader. This is my code: MyWebserviceBeanService service = new MyWebserviceBeanService(); MyWebserviceRemote mwr = service

问题 I need to load a native library in Tomcat which will be used by web apps. I've created a wrapper class that calls System.load("path/to/library") just as described in: http://wiki.apache.org/tomcat/HowTo#I.27m_encountering_classloader_problems_when_using_JNI_under_Tomcat My class definition is similar to the one in the link: public class FooWrapper { public native void doFoo(); } I am able to call doFoo() from a standalone application (which means that the native method Java_packagename

问题 I'm trying to make a URLClassLoader which behaves as follows: If asked for a class whose name is in a given set of inclusions, load it as normal Otherwise, return a dummy class I can't get this to work. In the attempt below, I expect the SpecialClassLoader to load Test$Thing succesfully. In doing so, I expect it to attempt to load Test$SuperThing , and I expect it to be okay about the fact that the dummy class Nothing is loaded instead. However, something goes awry and a NoClassDefFoundError