dynamic-class-loaders

NoClassDefFoundError when adding classes to the classpath at runtime when I used abstract or interface in Main class

由 孤人 提交于 2019-12-11 04:44:49
问题 I know Java loads Classes in first Access (creating new Instance, calling static method or static field), but in this simple example I try to execute a jar file that uses some classes which there aren't in my ClassPath at run time. I expect (because of loading classes in first access) print my messages in static block and main method before an exception occurred. but I got "Exception in thread "main" java.lang.NoClassDefFoundError: com/example/DateAbstract" and nothing printed. This occurred

gwan not re-compiling java files

由 て烟熏妆下的殇ゞ 提交于 2019-12-11 04:07:12
问题 I tested against the standard hello.java and hello.c that comes with the gwan server running on Ubuntu 12.04 server. G-WAN 4.3.1 64-bit (Mar 1 2013 17:36:39) Once I run gwan with sudo ./gwan -d I also noticed the same behavior running without the daemon option. Then browse to 192.168.0.2:8080/?hello.c I get the expected output of "Hello, ANSI C!". I change the text in hello.c and refresh the browser and get the expected changes. If I do the same thing with the hello.java file, changes to the

Android: Loading a library and using it only for development branch not for release

由 陌路散爱 提交于 2019-12-11 02:38:06
问题 Problem Statement: I want to use a library only on development environment but not on release (app store release). And I don't want that library to get built in release apk also. My appraoch: So, I have an environment setup like this: Development - Debug Release Store - Debug Release -> This goes to play store In gradle I have added - debugCompile 'com.some.library' Which loads this library for Development - Debug and Store - Debug And then I have created two Application classes,

Beanshell will not allow me to add jars to the “default” JRE classloader?

由 前提是你 提交于 2019-12-10 19:43:11
问题 I have a question about Beanshell that I can't find an answer to anywhere. I am only able to run Beanshell scripts in 1 of 2 ways: Where Classpath is defined before invoking Beanshell and Beanshell uses the JRE default classloader. Where no classpath is defined at all before starting Beanshell and then I use addClassPath() and importCommands() to dynamically build the classpath within Beanshell's classloader. This method does not seem to inherit a jars that were part of the default JRE

Java custom class loader issue

由 青春壹個敷衍的年華 提交于 2019-12-06 04:49:33
问题 I'm sending a Class object from client to server side. Every time the server needs to load the Class object sent by the client instead of reusing it by parent delegation model (when it was loaded during the 1st iteration). I'm trying to use a custom class loader on the server side whose loadClass(String) simply calls findClass() instead of checking with parent hierarchy. To achieve this, I'm doing following: Generate byte[] by reading the .class file on the client side as following: Class cl

Dynamic class reloading works only in debug mode, why/ how it really works?

由 情到浓时终转凉″ 提交于 2019-12-06 03:01:39
I have a tricky question. My java program is doing in a loop such things: loop: read external file with compiled java class into byte[] array. create a new instance of my own classloader. setbytes from the readed file to this instance of classloader. using created classloader create a new instance of object of the class from external file. call any method of the created object. And where the problem is. When I run this program in debug mode it behaves as I expect, so if external file changed classloader loads new version of class and executes new version (if file didn't change it loads old

Java: Strong Code mobility How to?

由 萝らか妹 提交于 2019-12-06 00:50:57
问题 Does anyone know how to use Java for Strong code mobility? Have you ever done it before? Here's what I try to achieve. Suppose we have 2 separate Java applications that communicate over network. App A and App B. App A has a class x instantiated as an object, and has been using it. App B has no prior knowledge of this class x. App A needs to migrate the instance of class x over to App B. App B should be able to dynamically load class x, and retains the state of class x. I have Googled around

Java: Strong Code mobility How to?

由 折月煮酒 提交于 2019-12-04 05:16:00
Does anyone know how to use Java for Strong code mobility ? Have you ever done it before? Here's what I try to achieve. Suppose we have 2 separate Java applications that communicate over network. App A and App B. App A has a class x instantiated as an object, and has been using it. App B has no prior knowledge of this class x. App A needs to migrate the instance of class x over to App B. App B should be able to dynamically load class x, and retains the state of class x. I have Googled around and found a bunch of resources on how to dynamically load class at run-time. However, I'm not sure if

Sharing dynamically loaded classes with JShell instance

由 不问归期 提交于 2019-12-03 04:14:52
问题 Please view the edits below I'm trying to create a JShell instance that gives me access to, and lets me interact with objects in the JVM it was created in. This works fine with classes that have been available at compile time but fails for classes that are loaded dynamically . public class Main { public static final int A = 1; public static Main M; public static void main(String[] args) throws Exception { M = new Main(); ClassLoader cl = new URLClassLoader(new URL[]{new File("Example.jar")

Sharing dynamically loaded classes with JShell instance

由 限于喜欢 提交于 2019-12-02 17:34:14
Please view the edits below I'm trying to create a JShell instance that gives me access to, and lets me interact with objects in the JVM it was created in. This works fine with classes that have been available at compile time but fails for classes that are loaded dynamically . public class Main { public static final int A = 1; public static Main M; public static void main(String[] args) throws Exception { M = new Main(); ClassLoader cl = new URLClassLoader(new URL[]{new File("Example.jar").toURL()}, Main.class.getClassLoader()); Class<?> bc = cl.loadClass("com.example.test.Dynamic");//Works
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